- Title
- Bedrock geologic map of the Montreat 7.5-minute quadrangle, Buncombe, McDowell, and Yancey Counties, North Carolina
-
-
- Date
- 2016
-
-
- Creator
- ["Cattanach, Bart L. (Bart Lewis), 1973-"]
-
- Place
- ["Yancey County, North Carolina, United States","McDowell County, North Carolina, United States","Buncombe County, North Carolina, United States"]
-
- Series
- Open file report (North Carolina. Geological Survey Section) ; 2016-06.
-
-
Bedrock geologic map of the Montreat 7.5-minute quadrangle, Buncombe, McDowell, and Yancey Counties, North Carolina
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North Carolina Department of Environmental Quality
Energy Group
Jenny Kelvington, Executive Director
Kenneth B. Taylor, State Geologist
35'
82° 22' 30
45' 00" A
This Geologic map was funded in part by the USGS National Cooperative Geologic Mapping Program
1П7 01С
311,926
I
INTRODUCTION
DESCRIPTION OF MAP UNITS
CORRELATION
OF MAP UNITS
о
о
N
О
ш
-I
а
Pzmg
Alligator Back Metamorphic Suite
о
О
N
О
(Г
ш
О
сс
о.
о
ш
Zab
Zabss
Zabs
Zaba
Zabgs
The Montreat 7.5-minute Quadrangle lies in central western North Carolina, northeast of
the city of Asheville, and within parts of Buncombe, McDowell, and Yancey counties. The
south central part of the quadrangle is occupied by the towns of Black Mountain and
Montreat. Major transportation corridors include the Blue Ridge Parkway (bisects the
northern half of the quadrangle) and the Norfolk-Southern Railway (southeastern section
of the quadrangle). There are large tracts of undeveloped land on the quadrangle
including the Asheville municipal watershed (central-west) and parts of the Pisgah
National Forest that flank the Asheville watershed to the east and west. A portion of
Mount Mitchell State Park is on the northeast part of the quadrangle. Total elevation relief
is 4609ft with a low of 1920ft and a high of 6529ft. Major streams include the North Fork
of the Swannanoa River, Mill Creek, Peach Orchard Creek, Blue Sea Creek and the
headwaters of the South Toe River. The Buncombe-McDowell and McDowell-Yancey
county boundaries follow the Eastern Continental Divide in the southeastern portion of
the quadrangle.
GEOLOGIC OVERVIEW
Pzmg
stratigraphic
relations
uncertain
The Montreat
Ashe Metamorphic Suite
Za
Zacg
Zass
Zas
Zaa
Zau
stratigraphic
relations
uncertain
quadrangle comprises the Neoproterozoic to early Cambrian Ashe
Metamorphic Suite/Tallufah Falls Formation (AMS/TFF) and Alligator Back Metamorphic
Suite (ABMS) of the Tugaloo terrane. Both units are thick sequences of complexly
deformed and metamorphosed clastic sediments deposited in marine rift basins.
Interspersed with these sediments are lesser amounts of mafic volcanic rocks and
ultramafic rocks thought to have originated as oceanic crust at a spreading center (Misra
and Conte. 1991; Raymond and Abbott, 1997). Numerous pegmatites occur within the
AMS and ABMS and are thought to be related to the 361-392 Ma pegmatites within the
Spruce Pine Plutonic Suite (Mapes. 2002). No formal stratigraphic units are recognized in
the AMS and ABMS, but zones of dominant lithologies are shown on the map.
Rocks of the AMS have been metamorphosed to sillimanite- and kyanite-grade
conditions as opposed to rocks of the ABMS that have been metamorphosed to kyanite-
. . across the
The
l portions ot the AMS are non-migmatitic. Migmatization
increases markedly to the NW in the AMS. In the central and northwest portions of the
2) th
the quadrangle. In the SE section of the Montreat quadrangle, the AMS and ABMS are
strongly sheared to mylonitic with mainly SE-dipping foliation and exhibit a greenschist
facies overprint associated with reactivation of the Brevard fault zone, a regionally
extensive NE/SW trending Alleghanian ductile fault zone that is exposed less than 1 km
SE of the quadrangle (Hatcher and others, 2007).
The ABMS is interpreted to be younger than and overlie the AMS (Conley, 1985; Rankin
et al., 1973). In the Montreat Quadrangle, the first occurrence of the ABMS is indicated by
the presence of a mostly non-migmatific, graphitic schist. The contact is interpreted as an
oblique reverse fault evidenced by the truncation of AMS units and increased
shearing/mylonitization near the contact.
Zabss
SCHMIDT EQUAL-AREA
STEREONET DATA
Zabs
Zaba
Zabgs
Equal-area Schmidt Net projection of contoured poles to mylonitic
foliation of the Ashe Metamorphic Suite. Mylonitic foliation count 54.
Equal-area Schmidt Net projection of contoured poles to foliation
of the Ashe Metamorphic Suite. Foliation count 1691.
Equal-area Schmidt Net projection of contoured poles to mylonitic
foliation of the Alligator Back Metamorphic Suite. Mylonitic foliation count 81.
Equal-area Schmidt Net projection of contoured poles to foliation
of the Alligator Back Metamorphic Suite. Foliation count 186.
Zacg
Zass
Equal-area Schmidt Net projection of contoured poles to joints and
unidirectional rose diagram inset. Joint count 1402.
Equal-area Schmidt Net projection of fold hinges in blue and
mineral lineations in red. Fold hinge count 55.
Mineral lineation count 41.
Zas
STREAM SEDIMENT HEAVY MINERAL ANALYSIS
Stream sediment heavy mineral analysis was conducted from March 2016 through May 2016 to aid geologic mapping, better define conditions of metamorphism,
and inventory minerals of potential economic significance. Procedure: In the field, approximately 13.6 kg of stream sediment material is panned to approximately
300 g of heavy mineral concentrate at each sample locality. In the laboratory, concentrate is washed and passed through heavy liquid separation using
tetrabromoethane, and scanned with short- and long-wave ultraviolet illumination using an Ultra-violet Products Inc. Model UVGL-48 Mineralight Lamp. Magnetite
is removed with a hand magnet. A sample split is grain mounted on a standard 27x46 mm glass slide and approximately 200 grains are identified and counted
with the aid of a petrographic microscope and 1.67 index of refraction oil. Results of stream sediment heavy mineral analysis are tabulated below.
Mineral abbreviations used in table: Mg-magnetite; Cor-corundum; Ms-muscovite; Gt-garnet; Zr-zircon; Bt-biotite; Rt-rutile; Czo- clinozoisite; Sil - sillimanite; Hbl-
hornblende; Ttn-titanite; Tur-tourmaline; llm-ilmenite and other black opaque minerals; Hem-hematite and other red opaque minerals; Lx-leucoxene; Ud-
unidentified.
Zaa
SAMPLE1
COORDINATES
(State Plane, NAD 83 m)
MAP UNITS
DRAINED2
% TOTAL HM IN
SAMPLE3
PERCENT HEAVY MINERALS IN SAMPLE4
Mg
Cor
Ms
Gt
Zr
Bt
Rt
Czo
St
Sil
НЫ
Ky
Ttn
Tur
llm
Hem
Lx
Ud
NB 828
217, 103N; 31 5.013E
Zabqs, Zab
0.52
13.43
-
0.43
-
-
-
-
2.16
0.87
-
-
0.87
1.73
8.66
51.51
19.48
0.87
NB 829
223.556N; 315.619E
Zas, Za, Zacg
1.52
0.08
-
-
87.93
-
-
-
-
1.50
3.50
-
-
-
-
2.00
5.00
-
-
NB 830
221.634N; 307.936E
Za, Zaa
2.45
0.10
-
-
65.93
-
0.50
0.50
-
1.50
-
14.98
11.99
-
-
2.00
2.00
0.50
-
NB 833
214.457N; 309.805E
Zacq, Za, Zas
0.38
1.58
1.48
-
56.10
0.98
0.49
-
5.91
-
-
1.48
-
-
0.98
6.89
21.65
1.97
0.49
BC 859
21 7, 01 ON; 311.262E
Zacg, Za, Zas
1.07
0.52
-
-
81.84
-
-
-
2.94
1.47
1.47
0.98
0.49
-
0.00
1.47
8.33
0.00
0.49
Zau
’Sample numbers correspond to stream sediment heavy mineral sample localities shown on geologic map
2Up to three most dominant map units contributing to the drainage basin, listed in decending order of map area
Percentage of heavy minerals in 13.6 kg stream sediment sample
Point count percentages of heavy minerals from processed samples
Migmatite — White to very-light-gray; non-foliated to weakly foliated; medium- to coarse-grained;
equigranular; granoblastic; occurs commonly as thin layers and lenses (thickness of layering ranges
from centimeters to meters) within other rock types and mappable bodies; locally gradational with
pegmatite; consists of plagioclase feldspar, quartz, potassium feldspar, muscovite, sericite, biotite, minor
opaques, and trace amounts of zircon. Migmatite (neosome) was most likely derived from local melting
during regional high-grade metamorphism.
Alligator Back Metamorphic Suite
Undivided — Heterogeneous unit consisting of interlayered layers and lenses of laterally and vertically
grading sedimentary and mafic volcanic rocks metamorphosed to kyanite grade. Rock types include
metagraywacke, metawacke, metasandstone, schistose metagraywacke, and schist with minor amounts
of metasiltstone, quartzite, and calc-silicate. Thickness of layering ranges from centimeters to meters.
Metagraywacke — medium-light-gray to medium-dark-gray; fine- to medium-grained; foliated;
granoblastic; consists of quartz, plagioclase feldspar, biotite > muscovite, with minor amounts of garnet,
potassium feldspar, chlorite, titanite, epidote group minerals, tourmaline, rare staurolite, other accessory
minerals, and trace amounts of zircon and apatite.
Metawacke — light-tan to light-gray; fine- to medium-grained; foliated to mylonitic; granoblastic to
lepidoblastic; consists of quartz, plagioclase feldspar, muscovite > biotite, sericite, chlorite with minor
amounts of garnet, potassium feldspar, titanite, apatite, and other accessory minerals; locally has
millimeter scale “pin-striped” fabric.
Schistose Metagraywacke — medium-gray to dark-gray; fine- to medium-grained; well foliated to
mylonitic; equigranular to inequigranular; granoblastic to lepidoblastic to porphyroblastic; locally
migmatitic; consists of quartz, plagioclase feldspar, 40-60% muscovite and/or biotite with minor amounts
of garnet, kyanite, and accessory minerals.
Metasandstone — Tan to light-gray to medium-gray to light-green; fine- to medium-grained; foliated to
locally mylonitic; equigranular to inequigranular; consists of quartz, feldspar, muscovite, locally biotite,
and accessory minerals; interlayered with lesser amounts of quartzite, metasiltstone, metagraywacke,
metawacke, and schistose metagraywacke; locally has a thin “pin-striped” tectonic fabric.
Schist — Garnet-mica schist, muscovite schist, muscovite-biotite schist; very light-gray to greenish-gray
to medium-gray; medium- to coarse-grained; well foliated and locally mylonitic; inequigranular;
lepidoblastic; consists of muscovite, biotite, garnet, quartz, plagioclase feldspar, potassium feldspar, and
minor accessory minerals; locally contains chlorite, chloritoid, staurolite, tourmaline, kyanite, graphite,
and trace zircon. Interlayered with lesser amounts of schistose metagraywacke, metasandstone, and
phyllonite.
Amphibolite — Dark-green to black; fine- to medium-grained; foliated to mylonitic; equigranular;
granoblastic to nematoblastic; locally porphyroblastic; consists of hornblende, plagioclase feldspar,
actinolite, chlorite, epidote group minerals with trace amounts of quartz, garnet, titanite, magnetite, and
other opaque minerals.
Graphitic schist — Dark-gray to greenish-gray to medium-gray; fine- to medium-grained; well foliated to
mylonitic; equigranular to inequigranular; lepidoblastic to porphyroblastic; locally with kyanite
porphyroblasts; consists of muscovite, biotite, garnet, sericite, quartz, graphite, feldspar, chlorite,
staurolite, pyrite, and accessory minerals; interlayered with lesser amounts of metasandstone,
metawacke, metasiltstone, schistose metagraywacke, schist, and phyllite.
Ashe Metamorphic Suite
Undivided — Heterogeneous unit consisting of interlayered layers and lenses of laterally and vertically
grading sedimentary and mafic volcanic rocks metamorphosed to kyanite and sillimanite grade. Rock
types include metagraywacke schist, schistose metagraywacke, conglomeratic metagraywacke,
metaconglomerate, metasandstone, amphibolite, and minor calc-silicate. Thickness of layering ranges
from centimeters to meters.
Metagraywacke — medium-light-gray to medium-dark-gray; medium- to coarse-grained; weakly foliated
to foliated; equigranular to inequigranular; granoblastic to lepidoblastic; locally migmatitic; consists of
quartz, plagioclase feldspar, biotite, muscovite, garnet, epidote, staurolite, chlorite, opaques with trace
potassium feldspar and zircon; thickness of layering ranges from decimeters to meters; interlayered with
other Za lithologies.
Schistose Metagraywacke — medium-gray to dark-gray; fine- to medium-grained; well foliated;
equigranular to inequigranular; granoblastic to lepidoblastic to porphyroblastic; locally migmatitic;
consists of quartz, plagioclase feldspar, muscovite, biotite, garnet, minor sillimanite or kyanite, and
accessory minerals; interlayered with other Za lithologies.
Calc-silicate — light-gray; medium- to coarse-grained; weakly foliated; consists of quartz, feldspar,
epidote group minerals, garnet, biotite, pyroxene, and trace chlorite.
Conglomeratic metagraywacke — Medium-light-gray to medium-dark-gray; coarse-grained (mainly
granule size, but locally pebble size clasts); non-foliated to foliated; inequigranular; granoblastic;
consists of quartz, plagioclase feldspar, biotite, muscovite, potassium feldspar, and trace opaque
minerals; thickness of layering ranges from meters to tens of meters; granule and pebble composition is
dominantly quartz with lesser amounts of feldspar; interlayered with metaconglomerate, metasandstone,
metagraywacke and lesser amounts of other Za lithologies.
Metaconglomerate — medium-light-gray to medium-dark-gray; coarse-grained (mainly pebble size, but
with some granule size clasts); non-foliated to foliated; locally contains deformed quartz clasts up to 7.5
cm in length; inequigranular; granoblastic; consists of quartz, plagioclase feldspar, potassium feldspar,
biotite, muscovite, chlorite, minor titanite, apatite, epidote group minerals with trace opaque minerals
and zircon; thickness of layering ranges from meters to tens of meters; pebble and granule composition
is dominantly quartz with lesser amounts of feldspar; clasts contain inclusions of quartz, muscovite,
biotite, and plagioclase feldspar; interlayered with other Za lithologies.
Metasandstone — tan to medium-light-gray to gray; fine- to coarse-grained; weakly foliated to mylonitic;
equigranular; locally migmatitic; consists of quartz, feldspar, muscovite, biotite, minor opaques, and
trace zircon and other accessory minerals; interlayered with other Za lithologies.
Garnet-Mica Schist — Very light-gray to greenish-gray to medium-gray; fine- to coarse-grained;
strongly foliated; inequigranular; lepidoblastic to porphyroblastic; locally migmatitic; consists of
muscovite, sericite, quartz, biotite, garnet, plagioclase feldspar, sillimanite or kyanite, chlorite, and trace
opaques; interlayered with other Za lithologies.
Amphibolite — Where mappable it occurs as a metamorphic alteration of an ultramafic or mafic rock.
Dark-green to black; fine- to coarse-grained; weakly to strongly foliated; equigranular; granoblastic to
nematoblastic; consists of hornblende, plagioclase feldspar, epidote group minerals, quartz, garnet,
chlorite, relict pyroxene, titanite, magnetite, and opaques. Locally contains small bodies of altered
ultramafic rocks not mapped at this scale. Can occur as a very minor rock type throughout the other
map units, where it may represent a metamorphosed volcanic rock.
Altered Ultramafics — Dark-green to silvery-grayish-green; fine- to medium-grained; non-foliated to
strongly foliated; equigranular; granoblastic to nematoblastic to lepidoblastic; consists of
tremolite/actinolite, pyroxene, hornblende, chlorite, talc, serpentine, relict olivine, opaques, plagioclase
feldspar, magnetite, and other accessory minerals. These mineralogical variations could not be mapped
at a 1:24,000 scale. Amphibolite within and adjacent to this unit occurs as a metamorphic alteration of
the ultramafic or mafic rock. Thickness of amphibolitic alteration is variable. Contains inclusions of other
variations of altered mafic and ultramafic rock.
Mineral abundances are listed in decreasing order of abundance based upon visual estimates of hand
samples and thin-sections.
North Carolina Geological Survey
Open File Map 2016-06
шаятшя^—^шяяя
224.781 —
220.781 —
216.781 —
WHOLE ROCK ICP ANALYSIS1 OF SELECTED SAMPLES
SAMPLE2
COORDINATES
(State Plane NAD 83 m)
ROCK TYPE
MAP
UNIT
OXIDES IN PERCENT
ELEMENTS IN PPM3
r
o
4»
SUM5
Si02
AI203
Fe203
MqO
CaO
Na20
K20
ТЮ2
P205
MnO
Cr203
Cu
Ba
Zn
Ni
Co
Sr
Zr
Ce
Y
Nb
Sc
BC 650 MO
226,01 6N; 305, 856 E
blastomylonite
Pzmq
71.28
14.56
3.19
1.54
3.42
3.37
1.27
0.66
0.03
0.01
<0.002
2.1
378
64
<20
9.1
463
70.6
6.4
1
3.7
2
0.5
99.91
MO 18 BC
215,158N; 315.141E
muscovite-staurolite-qamet schist
Zab
50.75
23.87
11.29
2.52
0.25
1.04
4.00
1.07
0.16
0.15
0.012
24
578
173
23
<20
116
255
125
51
19
22
4.7
99.95
MO 56 BC
213.708N; 314.920E
metasiltstone
Zab
65.89
15.48
5.87
1.96
1.00
2.32
3.90
0.87
0.26
0.05
0.005
20
929
96
28
<20
190
465
75
24
15
9
2.2
99.98
MO 319 BC
216.487N; 315,351 E
metabasalt
Zab
46.00
13.63
17.25
7.77
10.25
1.87
0.27
1.01
0.05
0.26
0.024
141
15
133
83
53
57
34
<30
30
<5
58
1.4
99.82
MTR 53 NB
214.042N; 315,091 E
metaqraywacke
Zab
73.54
11.60
4.51
1.51
1.89
3.61
1.10
0.82
0.20
0.08
0.004
9
263
77
<20
<20
149
496
69
27
14
9
1.0
100.00
В
814MTRN
213.714N; 315.187E
qamet-muscovite-biotite schist
Zab
72.97
12.4
4.07
1.28
0.74
3.9
2.18
0.8
0.22
0.04
0.004
5.2
642
54
<20
6.4
158
534
96.7
33.2
14
7
1.2
99.86
MTR 38 NB
215.349N; 312.488E
metawacke
Zabss
86.40
6.83
1.88
0.40
0.19
0.26
1.61
0.49
0.03
0.02
<0.002
20
495
73
<20
<20
33
264
<30
20
9
3
1.8
100.02
MTR 259 NB
215.192N; 313,821 E
porphyritic metabasalt
Zaba
48.99
13.11
16.65
6.72
10.41
1.36
0.29
1.03
0.06
0.22
0.017
93
25
117
72
48
68
39
<30
31
<5
54
0.9
99.84
MTR 5 NB
213.261N; 310.869E
quartz-plaqioclase-muscovite schist
Zabqs
64.47
17.86
4.66
1.31
1.16
2.51
2.28
0.82
0.28
0.16
0.006
53
459
69
<20
<20
123
562
152
43
21
14
4.3
99.99
RW 51 MTRN
223.979N; 314.894E
muscovite metasandstone
Za
86.72
5.49
3.76
0.24
<0.01
0.05
1.69
0.47
0.04
0.01
<0.002
11
253
7
<20
1.6
16.9
306
20
5
8
4
1.4
99.96
BC 658 MO
224,940N; 312,952E
biotite-muscovite-gamet-sericite schist
Za
54.47
21.71
9.95
2.82
1.29
1.61
3.36
1.03
0.21
0.16
0.012
11.4
662
110
<20
15
136
250
152.8
66.2
21.9
23
3.1
99.82
BC 655 MTR
226.960N; 305.838E
metaqabbro
Za
50.42
23.84
6.23
2.73
9.67
4.42
0.29
1.46
<0.01
0.06
0.002
20.5
40
24
<20
15
964
21.3
7.8
14.2
1.9
17
0.7
99.81
NB 586 MT
224,584N; 313.059E
staurolite-biotite-chlorite-gamet-muscovite schist
Za
47.89
25.74
11.24
3.26
1.45
1.55
3.98
1.17
0.22
0.15
0.013
38
727
42
40
25
145
282
178.2
64.7
21.9
23
3
99.77
M523
225.639N; 308,931 E
metaqrawacke
Za
50.33
21.97
11.37
3.48
3.76
3.86
2.31
1.17
0.28
0.15
0.012
9
937
102
49
37
347
258
183
87
22
28
0.7
99.65
NB 603 MTRN
224,284N; 315,512E
metaconglomerate
Zacg
85.41
6.64
2.14
0.48
1.26
1.22
1.51
0.33
0.34
0.04
<0.002
2.3
511
25
<20
3.4
125
223
24.1
23.9
6.2
3
0.5
99.95
MO 309 BC
217.966N; 312.604E
metaconqlomerate
Zacq
84.61
6.77
2.84
0.77
1.08
1.70
1.07
0.45
0.01
0.04
0.002
7
239
32
<20
<20
103
274
64
14
9
4
0.6
100.01
МО
204A NB
213,551 N; 304,451 E
metagabbro
Zaa
46.84
14.63
13.83
7.85
11.07
2.61
0.16
1.50
0.06
0.22
0.026
12
39
101
55
46
185
96
<30
31
<5
47
1.0
99.84
NB 639 MTRN
220.075N; 309.252E
metaqabbro
Zaa
49.15
13.23
15.16
5.56
8.77
3.72
0.21
2.97
0.36
0.24
0.004
7.5
219
37
<20
40
162
230
26.6
54.9
6.9
45
0.3
99.74
M587
224,797N; 306, 772 E
amphibolite
Zaa
45.81
16.85
11.66
9.16
10.23
1.97
0.37
1.13
0.11
0.21
0.036
5
44
134
170
58
179
78
5
41
5
53
1.9
99.53
M557
225.834N; 307489E
altered ultramafic
Zaa
49.6
6.58
11.27
22.64
7.06
0.3
0.09
0.43
0.05
0.14
0.322
124
13
73
976
105
11
24
5
7
5
16
1
99.66
MTR 409 NB
219.551N; 306.140E
meta-peridotite
Zau
41.25
6.78
12.43
30.17
3.22
0.04
0.02
0.37
<0.01
0.18
0.372
41
10
71
1540
116
31
24
<30
6
<5
16
4.4
99.52
RW 23 MTRN
225.995N; 307,051 E
altered ultramafic
Zau
47.36
10.69
13
19
6.56
0.89
0.14
0.75
0.06
0.19
0.229
77.6
23
2
467
75
5.6
48.8
6.1
14.8
1.5
25
0.7
99.63
BC 732 MTRN
225.789N; 307.480E
altered ultramafic
Zau
45.96
12.45
11.39
19.8
7.16
0.67
0.1
0.92
0.07
0.19
0.211
3.8
5
2
745
85
19.2
63.8
8.3
17.5
1.3
29
0.6
99.62
35° 37' 30"
82" 22' 30'
82" 15' 00"
35° 45' 00"
—224.781
—220,781
—216.781
307,926
311,926
35° 37' 30"
82° 15' 00"
Topographic base produced by the United States Geological Survey.
Altered by the North Carolina Geological Survey for use with this map.
North American Datum of 1983 (NAD83).
World Geodetic System of 1984 (WGS84).
Projection:State Plane North Carolina FIPS 3200 (Meters)
4,000-meter ticksState Plane North Carolina FIPS 3200 (Meters)
A
Q5
SCALE 1 :24 000
0 NUMBERS
ROAD CLASSIFICATION
6' 35
TT7MILS
O' 46
14 MILS
1ГГМ
GRID AND 2013 MAGNETIC NORTH
DECLINATION AT CENTER OF SHEET
10CO
£00
0
Q5
MBTFS
0
10Ю
3X0
Expressway
Secondary Hwy
Ramp
MILS
10CO
0
10CO
3X0
3X0
40C0 £0C0
0X0
70CO
8X0
9X0
10COO
QUADRANGLE LOCATION
Local Connector _
Local Road
4WD -
US Route
О
State Route
Roads . ©2006-2012 TomTom
Roads within US Forest Service Lands . FSTopo Data
with limited Forest Service updates, 2013
Names . GNIS, 2013
Hydrography . National Hydrography Dataset, 2012
Contours . National Elevation Dataset, 2008
Boundaries . Census, IBWC, IBC, USGS, 1972 - 2012
U.S. National Grid
100,000-m Square ID
LV
Grid Zone Designation
17S
FEET
CONTOUR INTERVAL 40 FEET
NORTH AMERICAN VERTICAL DATUM OF 1988
This map was produced to conform with the
National Geospatial Program USTopo Product Standard, 2011.
A metadata file associated with this product is draft version 0.6.11
Barnardsville
Mount
Mitchell
Celo
Q-aggy
Pinnade
Mon treat
Old
Fort
Oteen
Black
Mountain
Mofiitt
Hill
Interstate Route Q
QFSPrtm„Roa.
□''"“Г*"'
||„JS5S
Clearance Route
Check with local Forest Service unit
for current travel conditions and restrictions.
MONTREAT, NC
2013
ADJOINING 7.5 QUADRANGLES
’Whole Rock Inductively Coupled Plasma - Atomic Emission Spectrometer (ICP) analysis conducted by Bureau Veritas, 9050 Shaughnessy St, Vancouver, BC Canada V6P 6E5.
2Sample numbers correspond to thin section and whole rock sample localities shown on geologic map
3PPM = parts per million
4LOI = loss on ignition in percent
5SUM = Sum total in percent
CROSS SECTION A-A
REFERENCES
Conley, J.F., 1985, Geology of the southwestern Virginia Piedmont: Virginia Division of Mineral Resources Publication, no. 59, 33 p.
Hatcher, R.D., Jr., Bream, B.R., and Merschat, A.J., 2007, Tectonic map ot the southern and central Appalachians: A tale of three
orogens and a complete Wilson cycle, in Hatcher, R.D., Jr., Carlson, M.P, McBride, J.H., and Martinez Catalan, J.R., eds., 4-D
Framework of Continental Crust: Geological Society ot America Memoir 200, p. 595-632, doi:
10.1130/2007.1200(29).
Mapes, R. W., 2002, Geochemistry and geochronology ot mid Paleozoic granitic plutonism in the southern Appalachian Piedmont
terrane, North Carolina-South Carolina-Georgia [M.S. thesis]: Nashville, Vanderbilt University, 150 p.
Miller, B.V., Stewart, K. G., Miller, C. F., and Thomas, C. W., 2000, U-Pb ages from the Bakersville, North Carolina eclogite:Taconian
eclogite metamorphism followed by Acadian and Alleghanian cooling: Geological Society 32(2): 62.
Misra, K.C., and Conte, J.A., 1991, Amphibolites of the Ashe and Alligator Back Formations, North Carolina: Geological Society of
America Bulletin, v. 103, p. 737-750.
Rankin, D.W., Espenshade, G.H., and Shaw, K.W., 1973, Stratigraphy and structure of the metamorphic belt in northwestern North
Carolina and southwestern Virginia: A study from the Blue Ridge across the Brevard Fault Zones to the Sauratown Mountains
Anticlinorium: American Journal of Science, V.273-A, p. 1-40.
Raymond, L.A., and Abbott, R.N., 1997, Petrology and Tectonic Significance of Ultramafic Rocks Near The Grandfather Mountain
Window In The Blue Ridge Belt, Toe Terrane, Western Piedmont, North Carolina, In: Paleozoic Structure, Metamorphism, and
Tectonics of the Blue Ridge of Western North Carolina, Carolina Geological Society Field Trip Guidebook p. 67-85.
approximate extent of A'
Brevard Zone mylonitization |— 6000
Environmental
Quality
Ш
3000-1
LL
2000
1000-
Sea Level
Unit Contact
Fault Contact
Form Lines
arrows indicate relative motion along fault
О
indicates motion toward viewer
(^) indicates motion away from viewer
interpretive patterns of subsurface foliation orientations
based upon surficial structural measurements
Research supported by the U.S. Geological Survey, National Cooperative Geologic Mapping
Program under STATEMAP (Awards - 2015, G15AC00237; 2014, G14AC00230). This map and
explanatory information is submitted for publication with the understanding that the United
States Government is authorized to reproduce and distribute reprints for governmental use.
The views and conclusions contained in this document are those of the authors and should
not be interpreted as necessarily representing the official policies, either express or implied, of
the U.S. Government.
Bedrock Geologic Map of the Montreat 7.5-minute Quadrangle,
Buncombe, McDowell, and Yancey Counties, North Carolina
By
Bart L. Cattanach, G. Nicholas Bozdog, Sierra J. Isard, and Richard M. Wooten
Geology mapped from August 2014 to May 2016.
Map preparation, digital cartography and editing by G. Nicholas Bozdog, Bart L. Cattanach, and Sierra J. Isard
2016
This map supersedes NCGS OFR 2015-03. This is an Open-File Map. It has been reviewed
internally for conformity with North Carolina Geological Survey mapping standards and with
the North American Stratigraphic Code. Further revisions or corrections to this Open File
map may occur. Some station data omitted from map to improve readability. Please contact
the North Carolina Geological Survey for complete observation and thin-section data.
EXPLANATION OF MAP SYMBOLS
CONTACTS
Contact — Identity and existence certain, location inferred
Contact — Identity and existence certain, location concealed
Thrust fault — Identity and existence certain, location inferred.
Sawteeth on upper (tectonically higher) plate.
Arrows indicate relative motion.
У
78
»XX
X
X
"X
.•«V
VX
PLANAR FEATURES
(For multiple observations at one locality, symbols are joined at the "tail" ends of the strike lines)
Inclined metamorphic or tectonic foliation — Showing x , 83
у
Inclined bedding, for multiple observations at one
strike and dip X
/
locality — Showing strike and dip
Inclined metamorphic or tectonic foliation, for multiple
observations at one locality — Showing strike and dip
7'У
Small, minor inclined joint — Showing strike and dip
Vertical metamorphic or tectonic foliation — Showing strike
Vertical metamorphic or tectonic foliation, for multiple
observations at one locality — Showing strike
X
Inclined mylonitic foliation — Showing strike and dip
Inclined mylonitic foliation, for multiple observations
at one locality — Showing strike and dip
Small, minor inclined joint, for multiple observations
at one locality — Showing strike and dip
Small, minor vertical or near-vertical joint, for multiple
observations at one locality — Showing strike
Inclined cleavage, for multiple observations at one
locality — Showing strike and dip
LINEAR FEATURES
X
Inclined crenulation lineation — Showing bearing and plunge
X
Inclined aligned-mineral lineation — Showing bearing and plunge
Inclined slickenline, groove, or striation on fault
surface — Showing bearing and plunge
Inclined fold hinge of generic (type or orientation unspecified)
small, minor fold — Showing bearing and plunge
NATURAL RESOURCES
SDG - Sand and gravel MIC - Mica
STN..C - Stone, Crushed/Broken
OTHER FEATURES
о
Float station
N8206
A Thin section and whole rock analysis sample location
NB392
(•) Heavy mineral
X Prospect (pit or small open cut)
X Sand, gravel, clay, or placer pit
X Abandoned sand, gravel, clay, or placer pit
X Open pit, quarry, or glory hole
X Abandoned open pit, quarry, or glory hole
^ Inclined mine shaft
. . . Area of abandoned sand and gravel pits
METAMORPHIC AND TECTONIC CONDITIONS
C Location where sillimanite was observed
• Location where kyanite was observed
® Location where chlorite was observed
Location where staurolite was observed
Area of chlorite retrograde metamorphism
Major map-scale fault
Small, minor inclined fault — Showing strike and dip
T-
4—
fr-*
Antiform — Identity or existence questionable,
location accurate
Antiform — Identity and existence certain,
location accurate. Arrow shows plunge
direction of fold
Overturned antiform — Identity and existence
certian, location approximate. Arrows show
dip direction of limbs and plunge direction
of fold
— H-
H-
Lt — ?-
Synform — Identity or existence questionable,
location accurate
Synform — Identity and existence certain,
location accurate. Arrow shows plunge
direction of fold
Overturned synform — Identity and existence certian,
location approximate. Arrows show dip direction of
limbs and plunge direction of fold
TRAVERSE MAP
Hillshade derived from a six meter pixel resolution LiDAR (Light Detecting And Ranging) digital elevation model.
Red lines show paths of field traverses.
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