North Carolina Department of Environmental Quality
Energy Group
Jenny Kelvington, Executive Director
Kenneth B. Taylor, State Geologist
North Carolina Geological Survey
Open File Report 2016-16
Description of Map Units
78° 30' 00"
78° 22' 30"
Mitchi tiers
Crossroad*
Кеи
ini ore
' CZum4
FR-2072
FR-1200
FRf2073
FR-2080
PPccg
UJiievi
CZum
SM'-'fil
,425 •>
'Substa
•1020
Radio
rower
CZum
Tpttngsvilte'i
• WT-K
Geology mapped May, 2002 through October, 2002.
A
SEABOARD
CROOKED
CROOKED
A'
US 1A
COASTLINE SR 1130
NC 96
SR 1100
CREEK
CREEK
WEST
|
\/
|
|
EAST
(0
c
Ф
to
13
О
SEDIMENTARY UNITS
Qal: Quaternary alluvium: Unconsolidated, poorly-sorted and poorly stratified, tan to light gray
Qal deposits of gravel, sand, silt, and clay. Similar to stratified terraces along streams.
INTRUSIVE ROCKS
о
<л
оз
го
Jd - olivine diabase: Gray to bluish-black, generally fine-grained and locally porphyritic diabase,
consisting primarily of plagioclase, augite, olivine, magnetite and ilmenite. Occurs as steeply
dipping to vertical dikes. Dikes are indicated by solid lines where location is known, dashed where
inferred by correlation and magnetic data, and dotted where concealed. Isolated diabase stations
indicated by a red circle.
Jd2 - two-pyroxene diabase: Gray to bluish-black, fine to medium-grained and commonly
plagioclase porphyritic, olivine-free, augite + pigeonite diabase commonly containing quartz and
alkali feldspar granophyre. Dikes are indicated by solid lines where location is known, dashed where
inferred by correlation and aeromagnetic data, and dotted where concealed. Isolated diabase stations
indicated by a red circle.
?PZip - lamprophyre dike: A fine to medium-grained, panidiomorphic lamprophyre with generally
euhedral phenocrysts to 1 .5 mm of red-brown kaersutitic(?) hornblende, red-brown biotite, and pale
pink to beige augite. Amphibole is the most abundant ferromagnesian mineral, followed by biotite and
then clinopyroxene. Amphibole occurs in characteristically elongate slender prismatic habit, and is
randomly oriented. Biotite plates have inclusions of amphibole. The groundmass consists of
extensively sericitized alkali feldspar and sausurritized plagioclase, with alkali feldspar apparently
about twice as abundant as plagioclase. The rock contains sparse amygdules of epidote/clinozoisite
up to 1 cm. Up to 5% of the rock is opaque minerals, including pyrite. The rock is unmetamorphosed,
but shows significant late-magmatic and/or hydrothermal alteration. Secondary minerals include calcite.
Classified as a vogesite.
PPccg - Granite of the Cedar Creek pluton: Pink-white, medium to coarse-grained, unfoliated to
moderately foliated and lineated biotite granite, with local pegmatite.
PPrgd - granitoid facies d: Fine to coarse-grained, but primarily medium-grained equigranular
to moderately porphyritic (very rarely megacrystic), rarely foliated, pink or salmon and white
biotite
+/-
muscovite monzogranite. Commonly has an almost idiomorphic fabric with well-formed
alkali feldspar and plagioclase grains. Cl = 5 - 12. Contains common biotite schlieren and local
biotite crystal clots. Pegmatite dikes and pods are extremely common; locally, isolated xenocrysts
of alkali feldspar 1 - 4 cm in length also occur. Unit also contains relatively common xenoliths of
Raleigh terrane country rocks, especially in Ingleside and Louisburg quadrangles. Less commonly
contains autoliths of fine granodiorite ortonalite and may display igneous layering between biotite-rich
and biotite-poor phases. Weathered surfaces are commonly nubbly, friable and/or cavernous.
Rolesville main phase of Speer (1994).
Prgf - foliated Rolesville granite: Gray-white to pink-white, medium to coarse-grained, locally weakly
porphyritic, moderate to well-foliated biotite-bearing granite and leucogranite, gneissic granite and
leucogranite, and granitic to leucogranitic gneiss. Locally contains muscovite, garnet, or hornblende.
PPrgv - Averette granitoid (Speer, 1994): massive, coarse-grained biotite
+/-
muscovite granitoid,
having abundant subhedral orange alkali feldspar megacrysts to 1 cm. Locally foliated near western
margin of batholith.
PzZgg - gneissic biotite granitoid (Paleozoic?): Foliated biotite granitoid and granitoid orthogneiss
interlayered with Raleigh gneiss.
METAMORPHIC ROCKS
RALEIGH TERRANE
CZrgn
CZrgn - Raleigh gneiss: Mixed unit consisting mainly of fine to coarse-grained, well foliated,
compositionally layered, and locally lineated biotite granitoid gneiss, and lesser amounts of biotite +
hornblende gneiss, biotite schist, white mica
+/-
sillimanite schist, metagabbro, and amphibolite. More
mafic CZrg rocks locally contain clinopyroxene or garnet, and display hornfelsic texture. CZrg also
includes leucogranitic gneiss containing garnet and locally magnetite. The unit is locally intruded by
dikes of pink to gray granitic pegmatite and white to gray graphic granite.
CZum - metaultramafic rock: Dark green to black, fine to coarse-grained massive to foliated
talc-chlorite-actinolite schist and actinolite rock, locally with octahedral magnetite crystals.
EXPLANATION OF MAP SYMBOLS
CONTACTS
Lithologic contacts - Solid where location known,
dashed where inferred, dotted where concealed.
FAULTS
87
Faults- Solid where location known, dashed where inferred, dotted where concealed.
Tick mark indicates dip of fault plane.
FOLDS
antiform synform
STRUCTURAL SYMBOLS
Observation sites are centered on the strike bar or are at the intersection point of multiple symbols.
V
Strike and dip of inclined regional foliation (Srs)
V
Strike and dip of inclined diabase dike
X
Strike of vertical regional foliation
V
Strike and dip of magmatic foliation in granitoid
X
Strike of regional foliation, dip unknown
X
Strike of vertical magmatic foliation in granitoid
V
Strike and dip of inclined regional C or C foliation
sy
Strike and dip of biotite schlieren
X
Strike of vertical regional C or C foliation
У
Strike of biotite schlieren, dip unknown
65^/
Strike and dip of inclined joint surface
49
Strike and dip of quartz stringer
X
Strike of vertical joint surface
у
Strike and dip of inclined mesoscale brittle fault
X
Strike of joint surface, dip unknown
V
/
Strike and dip of axial surface of F2 fold
X
Strike of vertical joint surface
18
\
Bearing and plunge of mineral lineation
7y
Strike and dip of inclined pegmatite dike
\
Bearing of mineral lineation, plunge unknown
X
Strike of pegmatite dike, dip unknown
12
\
Bearing and plunge of minor fold hinge (F2)
OTHER STATIONS
A
silicified breccia outcrop location
FR 1164 ^
geochemical sample location
© station location
0.5 1
2000 4000 6000 Feet
500 1000 1500 Meters
1.5 Miles
1 :24,000 SCALE
CONTOUR INTERVAL 10 FEET
no vertical exaggeration
measurement in feet from ground surface
topographic profile not drawn
OXIDES IN PERCENT
SELECTED ELEMENTS IN PPM
SAMPLE II)
ROCK TYPE
MAP UNIT
8Ю2
ТЮ2
AI2G3
Fc2G3
MnO
MgO
CaO
Na2Q
K2Q
РЮ5
Cr2Q3
LOI
TOTAL
Ag
All
Ba
Ce
Co
Cu
Nd
Ni
Sr
Та
Zn
Zr
FR-I
2-pyx diabase
Jd2
50.44
0.84
17.5
11.19
0.17
4.93
10.96
2.58
0.53
0.1
0.02
1.1
100.4
<1
<1
100
13.7
43
69
8.2
39
196
<0.5
108
63
FR-2072
ultramafic
CZum in CZrgn
44.8
0.38
8.62
13.92
0.32
22.45
5.01
0.51
0.07
0.04
0.14
3.8
100.1
<1
<1
68
10
97
18
7.8
511
22
<0.5
145
72
FR-2073
ultramaflc (?)
CZrgn
46.84
0.22
22.22
6.04
0.1
8.64
13.92
1.23
0.24
0.03
0.14
0.7
100.4
<1
<1
<20
3
37.7
71
2.2
157
344
<0.5
65
23
FR-1020
biotite gneiss
CZrgn
68.97
0.52
15.09
5.19
0.1
0.77
2.54
4.75
2.17
0.09
<0.01
0.2
100.5
<1
<1
379
80.6
5.5
87
42.5
<5
220
0.8
176
250
FR-2080
biotite gneiss
CZrgn
72.45
0.33
13.31
3.39
0.06
1.13
2.98
3.66
2.29
0.06
<0.01
0.4
100.2
<1
<1
712
41.8
9.5
16
1 1.5
11
233
<0.5
76
105
FR- 1 1 64
biotite granite
PPrgd
71.29
0.28
14.8
2.58
0.03
0.52
1.15
3.39
4.78
0.09
<0.01
1.05
100.2
<1
2
1050
40.4
3.6
10
26.8
<5
402
<0.5
70
214
FR-I 200
gneissic granite
PPccg
72.08
0.24
14.72
2.16
0.04
0.43
1.88
3.82
4.21
0.06
<0.01
0.3
100.1
<1
<1
1050
63.8
3
11
19.4
6
329
0.8
67
158
LAMP-1
lamprophyre
?PZip (lamprophyre dike)
47.55
2.6
17.13
9.27
0.13
5.2
5.56
4.26
4.25
0.85
<0.01
1.4
98.54
1
<1
1310
82.7
34.3
44
44.5
63
1120
7.4
134
276
Powder material processing conducted at the Petrology Preparation Laboratory of the Department of Geography and Geology at the University of North Carolina Wilmington. v.
4/7/2016
Geochemical analyses completed by SGS Minerals, Toronto, Canada for 1 1 major and 49 trace elements. Whole-rock analyses using method codes XRF76Z + 75V, IMS95A, and FAI303, and individual clement method code ICMS12B for
Та.
6°
107 MILS
GN
1 31'
I 27 MILS
UTM GRID AND 1 978 MAGNETIC NORTH
DECLINATION AT CENTER OF SHEET
REFERENCES
Blake, D.E., 1 986, The geology of the Grissom area, Franklin, Granville, and Wake Counties, North Carolina:
A structural and metamorphic analyses [M.S. thesis): Raleigh, North Carolina State University, 300 p.
Horton, J.W., Jr., Blake, D.E., Wylie, A.S., Jr., and Stoddard, E.F., 1992, Geologic map of the Falls Lake -
Wake Forest area, north-central North Carolina: U.S. Geological Survey Open File Report 92-269,
scale 1:24,000, 9 p.
Speer, J. A., 1994, Nature of the Rolesville batholith, North Carolina, in Stoddard, E. F., and D. E. Blake (eds.),
Geology and Field Trip Guide, Western Flank of the Raleigh Metamorphic Belt, North Carolina: Carolina
Geological Society Guidebook, p. 57-62.
Acknowledgement: Thanks to Steve Stadelman (Novozymes North America, Inc.)
for allowing access to collect geologic data.
NA = No sample analysis
PPM = parts per million
LOI = loss on ignition
The electronic files of the geochemical data arc available upon request from the North Carolina Geological Survey.
Disclaimer:
This Open-File report is preliminary and has been
reviewed for conformity with the North Carolina
Geological Survey editorial standards or with
the North American Stratigraphic Code. Further
revisions or corrections to this preliminary map
may occur.
Base topographic map is digital raster graphic image
of the Franklinton 7.5-minute quadrangle (1978).
This geologic map was funded in part by the
USGS National Cooperative Geologic Mapping Program,
under Assistance Award No. 01HGAG0061.
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 expressed or implied, of the U.S. Government.
GEOLOGIC MAP OF THE FRANKLINTON 7.5-MINUTE QUADRANGLE,
FRANKLIN AND WAKE COUNTIES, NORTH CAROLINA
By Edward F. Stoddard, Cindy M. Phillips, Channa D. Witanachchi,
Amy N. Ward, Paul F. Farris, David E. Blake and Timothy W. Clark
Digital representation by Michael A. Medina, Cindy M. Phillips, and Timothy W. Clark
Also includes previous mapping of Blake (1986) and Horton and others (1992)
2016
Wilton
Kittrell
Ingleside
Grissom
Franklinton
Louisburg
Wake Forest
Rolesville
Bunn West
ADJOINING 7.5' CUADRANGLES
INDEX TO GEOLOGIC MAPPING
Schmidt net equal-area plot
of contoured poles to
regional and shear foliations
(n = 235)
Contour Interval = 2
Unidirectional
Rose Diagram
of Joints
Outer Circle = 8%
N = 86
Franklinton 7.5-minute Quadrangle, Open File Report 2016-16