NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
Tracy E. Davis, Division Director
Dr. Kenneth B. Taylor, State Geologist
MAP UNITS
о
о
N ;
О
(Л 1
Ш I
V
V
breccia
<
О
>
О
о
сс
о
<
ос
со
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о
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N
О
СС
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о
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ш
unnamed intrusive
OCgg
granitoid gneiss
Poor Mountain Formation
Opmq
Opm
quartzite
undivided
unnamed meta-igneous rocks
hornblende quartzofeldspathic gneiss
GZhqf
GZhg
GZa
hornblende gneiss
amphibolite
altered ultramafic
Tallulah Falls Formation
eztf
undivided
GZtfb
porphyroclastic biotite gneiss
SCHMIDT EQUAL AREA STEREONET DATA
+ Trend and Plunge of minor fold axes. n = 14
+ Trend and plunge of mineral lineations. n = 15
270
Poles to joints with unidirectional joint azimuth Rose diagram inset, n = 623
+ Poles to faults with unidirectional fault azimuth Rose diagram inset, n = 14
This geologic map was funded in part by the USGS National Cooperative Geologic Mapping Program
12'30"
NORTH CAROLINA GEOLOGICAL SURVEY
OPEN FILE MAP 2013-02
82°07'30"
35°15'
ROCK DESCRIPTIONS
STRUCTURAL FEATURES
CONTACTS
Solid line - located in field to within 160 meters
Short-dashed line - location inferred
Question marked line - identity or existence questionable
Fault teeth - on upper plate
Breccia - Linear-trending cataclastic fault breccias form resistant outcrops and concentrations of
characteristic quartz float. Breccia is typically: white to very light gray; massive to weakly foliated; fine-
to medium-grained; quartz crystal growth locally present in void spaces; consists of 99% quartz, trace
biotite and opaque minerals.
Granitoid gneiss (OCgg) - A felsic intrusive body consisting mainly of quartz, feldspar, and biotite. It
is tentatively correlated with biotite granitoid gneiss of Garihan, 2009. Granitoid gneiss may be neoso-
mal migmatite derived from local melting of the surrounding Tallulah Falls Formation during regional
high-grade metamorphism. Granitoid gneiss is typically: white to pinkish gray to light gray; weakly
foliated to mylonitic; medium- to very coarse-grained; inequigranular; locally gradational with pegmatite;
consists of plagioclase feldspar, potassium-feldspar, quartz, biotite, and minor garnet and muscovite.
Poor Mountain Formation
Undivided (Opm) - Heterogeneous unit of metagraywacke, schist, amphibolite, calc-silicate, quartzite,
and metaarkose. Metagraywacke: medium light gray to medium dark gray; foliated; locally mylonitic;
medium- to coarse-grained; equigranular to inequigranular; granoblastic to lepidoblastic; migmatitic;
consists of 20-49% quartz, 20-44% plagioclase, 6-40% biotite, trace-20% muscovite, trace-1 % garnet.
Schist consists of muscovite, biotite, garnet, quartz, feldspar, and trace epidote, chlorite, and opaque
minerals. Amphibolite consists of hornblende, plagioclase feldspar, epidote, biotite and trace amounts
of opaque minerals. Calc-silicate consists of 65% quartz, 15% garnet, 15% biotite, 5% epidote, and
trace chlorite.
Quartzite/meta-arkose (Opmq) - Very pale orange to grayish orange, dusky yellowish brown on
weathered surfaces; foliated; medium-grained; equigranular; granoblastic; consists of 55-80% quartz,
25% potassium feldspar, trace-25% garnet, trace-1 5% biotite, trace-1 0% plagioclase feldspar, trace-
10% muscovite, trace-5% epidote, and trace-3% opaque minerals.
Meta-igneous rocks
Hornblende and hornblende quartzo-feldspathic gneisses with minor mappable bodies of amphibolite
and altered ultramafic rocks are interpreted to be intrusive into and stratigraphically lower than the
Tallulah Falls Formation.
Hornblende quartzo-feldspathic gneiss (GZhqf) - Very light gray to grayish black, commonly
weathers dark yellowish orange; fine- to medium-grained; equigranular; foliated; well layered; consists
of 5-50% quartz, 25-45% plagioclase, 10-30% potassium feldspar, trace-30% epidote, 1-25% biotite,
trace-25% muscovite, 3-21% hornblende, trace-8% chlorite, trace-5% garnet, and trace apatite and
opaque minerals; interlayered with amphibolite and hornblende gneiss
Hornblende gneiss (GZhg) - Mottled white to greenish black on fresh surfaces; weathered surfaces
are mottled white to dark reddish brown; medium- to coarse-grained; equigranular; foliated; massive to
well layered; migmatitic; consists of 20-45% hornblende, trace-45% epidote, 30% plagioclase, 5-25%
quartz, trace-20% biotite, trace-4% titanite, and minor opaque minerals.
Amphibolite (GZa) - Occurs as a minor rock type throughout other map units and as small mappable
bodies within the hornblende quartzo-feldspathic gneiss: mottled white to dark green to black; fine- to
coarse-grained; equigranular to nematoblastic; foliated; consists of 45-60% hornblende, trace-55%
epidote group minerals, 25-37% plagioclase, trace-9% biotite, trace-8% quartz, trace-5% muscovite,
and minor garnet, chlorite, pyroxene, titanite, and opaque minerals.
Altered ultramafic (GZau) - Interpreted to be an altered pyroxenite: medium green; foliated; grano¬
blastic to nematoblastic; equigranular; medium- to coarse-grained. Coarse-grained, bronze, poikilitic
hypersthene with green amphibole inclusions locally preserve a relict porphyritic texture. Consists of
70-75% green amphibole, 15-20% hypersthene, 10-15% enstatite, 2-5% chlorite, and trace opaque
minerals including magnetite. A banded quartz-magnetite rock occurs on the margins of the body and
consists of 70% quartz and 30% opaque minerals including magnetite and hematite.
Tallulah Falls Formation
The Tallulah Falls Formation is a thick, heterogeneous sequence of metamorphosed sedimentary and
volcanic rocks. Individual rock types within the Tallulah Falls Formation are interlayered with each
other at all scales.
Biotite gneiss (GZtfb) - Heterogeneous unit consisting of interlayered porphyroclastic biotite gneiss,
metagraywacke, and schist with lesser amounts of hornblende quartzo-feldspathic gneiss. Tallulah
Falls biotite gneiss locally separates metagraywackes and schists of the Tallulah Falls Formation from
hornblende gneiss and hornblende quartzo-feldspathic gneiss. Biotite gneiss is typically: white to
grayish black; well foliated; compositionally layered; locally protomylonitic; medium- to coarse-grained;
inequigranular; porphyroclastic to lepidoblastic; migmatitic; consists of 25-40% quartz, 20-38% plagio¬
clase, 10-20% biotite, 5-20% potassium feldspar, 3-15% muscovite, 2% garnet and 2% epidote.
Undivided (GZtf) - Interlayered sequence of metagraywacke, schistose metagraywacke, schist, and
amphibolite. Metagraywacke: medium light gray to medium dark gray; foliated (ranges from massive
to gneissic); medium- to coarse-grained; equigranular to inequigranular; granoblastic to lepidoblastic;
migmatitic; consists of quartz, plagioclase, biotite, muscovite, potassium feldspar, sillimanite, and
minor opaques, epidote and apatite; thickness of layering ranges from decimeters to meters. Interlay¬
ered at all scales with garnet-mica schist, schistose metagraywacke, amphibolite, and minor calc-
silicate. Schistose metagraywacke: medium-gray to dark-gray; foliated; fine- to medium-grained;
equigranular to inequigranular; lepidoblastic to weakly granoblastic to porphyroblastic; migmatitic;
consists of quartz, plagioclase, muscovite, biotite, potassium feldspar, sillimanite, epidote, chlorite, and
trace opaque minerals; thickness of layering ranges from several millimeters to meters; commonly
interlayered with metagraywacke, garnet-mica schist, amphibolite, and minor calc-silicate. Garnet
mica schist: silvery gray to medium dark gray; fine- to medium-grained; inequigranular; lepidoblastic
and porphyroblastic; migmatitic; consists of muscovite, biotite, garnet, quartz, feldspar, and trace
epidote, chlorite, and opaque minerals; interlayered with metagraywacke, schistose metagraywacke,
amphibolite, and rare calc-silicate granofels.
Mineral abundances are listed in decreasing order. Percentages, where given, are based upon visual estimates of sample
thin-sections. Ranges of percentages are given where more than one sample of a particular rock type was analyzed.
Reference cited:
Garihan, J.M., 2009, Geologic map of the Landrum quadrangle, Greenville and Spartanburg Counties, South Carolina, and Polk
County, North Carolina: South Carolina Department of Natural Resources, Geological Survey, Geologic Quadrangle Map 44.
A _ ▲ _ 4
Thrust Fault Contact
Fault Contact
Rotational or Scissor Fault Contact
Stratigraphic Contact
STRIKE AND DIP OF PLANAR FEATURES
BEARING AND PLUNGE OF LINEAR FEATURES
Multiple observations at one locality
(observation site at junction of symbols)
Foliation
Mineral Lineation
Crenulation
NON-STRUCTURAL FEATURES
О
Float Location
+ Poles to foliations. n = 571
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 1 984 (WGS84I.
Projection: Universal Transverse Mercator, Zone 1 7S
1 0 000-foot ticks: North Carolina Coordinate System of 1983.
South Carolina Coordinate System of 1 983.
Imagery
Roads
Names
Hydrography .
C ontours
Boi.ndarres
NAIP, April 7009
■•■7006-70 10 lele Atlas
GNIS. 7010
National Hydrography Dataset. 7009
National flevatron Dataset. 70 II
Census, IBWt , IBC, USGS. 1977-7010
CROSS SECTION A-A1
ADJOINING 7.5' QUADRANGLES
ш
3000 -
+ Poles to mylonitic foliations, n = 86
CROSS SECTION B-B1
в
4000 -i
Sea Level
T3
cc
>S
0
05
>
c
05
0
CD
GZhqf _
eztf
leZha
Unit Contact
Form Lines
3000 m
m
- 1000
GZhg
ш
ш
3000 -
ш
2000 -
1000 -
Sea Level
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c
П5
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CC
0
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CC
CC
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0
0
0
ir
0
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05
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Unit Contact
Fault Contact
Form Lines
Mylonite Zone
eztfb
B1
4000
- 3000 m
m
- 2000
1 1000
Sea Level
Sea Level
Research supported by the U.S. Geological Survey, National
Cooperative Geologic Mapping Program, under USGS
award number G12AC20308. 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.
arrows show direction of motion
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.
Bedrock Geologic Map of the North Carolina Portion of the Landrum 7.5-minute Quadrangle
By
Bart L. Cattanach, Richard M. Wooten and G. Nicholas Bozdog
SAMPLE2
COORDINATES
(State Plane NAD 83 m)
ROCK TYPE
MAP
UNIT
Si02
AI203 Fe203
OXIDES IN PERCENT
MgO CaO Na20 K20
П02
P205
MnO
Cr203
Cu
Ba
ELEMENTS IN PPM3
Zn Ni Co Sr Zr Ce
Y
Nb
Sc
LOI4
SUM5
BC265
165,168N; 320,661E
felsic gneiss
GZhqf
71.86
14.29
3.42
0.64
1.06 3.06
2.25 0.61
0.09
0.05
<0.002
<5
1874
24
<20
<20 357 274 161
8
<5
5
2.3
99.92
BC280
169,789N; 318,007E
migmatite
GZtfb
66.68
16.08
4.58
1.54
2.57 2.17
2.68 0.51
0.31
0.07
<0.002
12
692
75
<20
<20 228 326 137
35
17
12
2.6
99.94
BC284
170,945N; 317,674E
hornblende gneiss
GZhbn
64.11
13.75
5.67
4.35
5.94 2.19
0.59 0.17
0.03
0.14
0.066
<5
90
53
63
<20 161 40 <30
12
<5
28
2.9
99.94
BC342
169,792N; 321,346E
meta-arkose
Opmq
76.38
12.91
1.23
0.18
0.97 2.38
3.06 0.29
0.06
0.01
<0.002
11
1296
14
<20
<20 121 255 36
16
16
6
2.3
99.94
BC361
170,080N; 316,525E
altered amphibolite
GZtfb
48.92
15.15
11.51
4.77
15.05 1.74
0.12 0.44
0.04
0.27
0.024
<5
<5
86
105
50 147 24 <30
21
<5
44
1.8
99.93
BC412
165,478N; 316,458E
calc-silicate
eztf
45.39
19.34
6.29
0.56
11.36 0.01
0.91 0.51
0.1
11.95
<0.002
<5
199
44
<20
<20 83 247 58
34
26
22
3.5
100
BC417
169,189N; 317/791E
hornblende gneiss
GZhqf
51.27
15.63
11.75
3.66
6.92 3.38
2.72 2.5
0.69
0.21
<0.002
15
799
109
<20
<20 374 508 142
42
57
24
0.9
99.92
BC423
169,082N; 316,921E
felsic gneiss
GZhqf
70.44
14.59
4.1
1.08
4.51 3.25
1 0.38
0.11
0.06
<0.002
7
231
30
<20
<20 284 226 <30
16
<5
14
0.3
99.94
BC425
167,781N; 318,556E
calc-silicate
GZhqf
59.52
16.56
8.08
1.12
6.29 0.05
0.73 0.9
0.16
0.1
0.017
37
457
31
<20
<20 299 393 70
24
23
14
6.2
99.93
BC460
169,862N; 314,059E
meta-arkose
eztf
80.58
10.17
2.19
0.79
0.83 3.56
0.04 0.12
0.02
0.07
0.003
27
50
95
<20
<20 41 224 <30
27
<5
7
1.5
99.93
BC490
170,351N; 323,838E
metagraywacke
Opm
73.21
14.12
2.67
0.79
2.46 2.45
0.82 0.33
0.06
0.09
<0.002
27
338
24
<20
<20 260 183 <30
13
8
13
2.9
99.94
BC70
168,527N;
31Д026Е
biotite gneiss
eztfb
66.24
14.3
6.98
1.77
2.07 2.29
3.2 0.96
0.3
0.11
0.004
25
613
87
22
<20 198 284 55
28
17
11
1.6
99.95
BC85
170,495N; 316,317E
metagraywacke
eztfb
69.06
15.41
4.52
1.13
3.8 3.65
1.5 0.4
0.09
0.09
0.003
<5
303
49
<20
<20 152 161 46
19
10
14
0.2
99.94
NBX
165,937N; 321,037E
quartz magnetite rock
GZau
62.51
0.78
29.62
<0.01
2.02 <0.01
<0.01 0.01
0.12
2.89
0.003
6
950
18
105
209 2 <5 <30
5
<5
6
1.8
99.94
NB109
166,239N; 316,006E
granitoid
eztf
69.26
17
1.41
0.29
1.08 2.64
4.44 0.12
0.03
0.02
<0.002
6
2107
16
<20
<20 393 97 51
7
<5
4
3.4
99.94
NB11
167,371N; 319,333E
felsic gneiss
GZhqf
60.38
14.98
9.08
2.65
3.56 3.26
1.6 1.45
0.37
0.18
<0.002
65
303
99
<20
<20 122 279 32
59
<5
23
2.3
99.93
NB113
166,237N; 315,732E
granitic gneiss
eztf
71.02
16.09
1.24
0.18
0.85 4.48
4.56 0.08
0.03
0.01
<0.002
7
2092
10
<20
<20 497 90 41
5
<5
3
1.1
99.94
NB125
168,024N; 313,850E
garnet quartzite
Opmq
78.53
5.93
9.34
1.59
2.31 0.04
0.12 0.31
0.13
0.96
0.006
72
190
41
20
<20 23 64 57
22
5
8
0.6
99.93
NB12-A
167,382N; 319,322E
biotite gneiss
GZhqf
57.44
14.54
10.95
3.34
4.78 2.62
2.75 1.43
0.48
0.15
0.003
15
283
116
<20
<20 258 284 35
62
6
24
1.3
99.94
NB12-B
167,382N; 319,322E
felsic gneiss
GZhqf
73.94
13.57
2.52
0.45
1.76 4.08
2.55 0.17
0.03
0.03
<0.002
23
486
42
<20
<20 131 261 88
16
8
4
0.7
99.95
NB156
169,207N; 324,628E
mylonitic schist
Opm
50.86
23.79
12.37
1.28
0.07 0.08
2.44 1.34
0.11
0.15
0.022
111
363
140
35
<20 6 226 132
37
23
34
7.2
99.89
NB162
167,353N; 321.329E
felsic gneiss
GZhqf
73.82
13.55
2.93
0.58
2.49 3.05
1.67 0.27
0.05
0.05
<0.002
52
397
33
<20
<20 134 134 <30
9
9
12
1.4
99.95
NB2
170,730N;
317Д44Е
granitoid gneiss
GZhqf
73.97
14.4
1.62
0.27
2.94 3.02
1.83 0.1
0.02
0.03
<0.002
11
914
19
<20
<20 190 122 <30
<3
<5
3
1.6
99.96
NB241
166,393N; 320,709E
altered pyroxenite
GZau
48.13
9.5
9.89
19.51
8.95 0.84
0.13 0.21
0.02
0.16
0.189
39
<5
59
425
70 28 14 <30
7
<5
34
2.3
99.91
NB24
165,802N; 322,019E
felsic gneiss
GZhqf
74.9
11.97
3.57
1.2
2.91 2.19
0.89 0.27
0.13
0.06
0.004
27
64
47
23
<20 155 74 <30
15
<5
17
1.8
99.94
NB245
166,049N; 321,062E
altered pyroxenite
GZau
47.62
8.59
10.39
20.41
8.27 0.32
0.08 0.14
<0.01
0.21
0.284
104
42
67
542
72 26 10 <30
8
<5
33
3.5
99.94
NB260
170,829N; 315,481E
amphibolite
eztfb
48.44
15.19
11.49
8.7
9.33 3.21
1.37 0.7
0.06
0.29
0.06
7
126
99
91
36 142 37 <30
31
<5
41
1
99.93
NB262
170,585N; 315,349E
granitoid gneiss
eztfb
66.02
15.84
4.22
1.66
3.62 3.46
3.38 0.4
0.27
0.08
0.004
20
1040
55
<20
<20 647 332 135
16
17
9
0.7
99.93
NB27
166,883N; 321,326E
amphibolite
eza
52.75
10.44
9.92
10.13
13.43 0.99
0.56 0.22
0.04
0.21
0.079
25
86
73
105
40 111 25 <30
7
<5
39
1.1
99.93
NB285
169,306N; 321.682E
quartz breccia
Opmq
95.69
1.48
1.12
0.13
0.02 0.03
0.36 0.03
0.03
0.01
0.003
7
6
<5
<20
<20 <2 <5 <30
<3
<5
1
1.1
99.94
NB302
170,294N; 316,999E
altered amphibolite
GZhqf
46.37
11.59
9.45
12.55
15.8 1.6
0.74 0.42
0.07
0.19
0.112
31
204
48
290
54 146 16 <30
9
<5
35
0.9
99.92
NB318
168,326N; 324,052E
calc-silicate
Opm
75.9
5.71
11.29
1.6
1.45 0.04
0.65 0.25
0.49
2.29
0.004
64
300
44
27
44 121 54 72
37
<5
8
0.2
99.96
NB338
165,422N; 317,093E
calc-silicate
eztf
52.59
18.3
7.64
1.6
15.85 0.08
0.09 0.85
0.11
0.14
0.009
6
37
109
20
<20 816 331 74
27
16
14
2.5
99.94
NB61
170,020N; 321,328E
meta-sandstone
Opmq
82.9
9.62
1.89
0.23
0.09 0.12
2.51 0.23
0.03
0.02
0.003
7
487
16
<20
<20 29 138 43
17
11
6
2.2
99.94
Geology mapped from September 2012 to May 2013. Map preparation, digital cartography
and editing by G. Nicholas Bozdog, Abigail R. Bullard, Bart L. Cattanach and Richard M. Wooten.
2013
’Whole Rock Inductively Coupled Plasma - Atomic Emission Spectrometer (ICP) analysis conducted by Acme Analytical Laboratories, LTD., 852 E. blastings St., Vancouver, BC
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
Landrum 7.5-minute Quadrangle, Open File Map 2013-02