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Quartz
Zefg - East Farrington pluton
QAP ternary diagram plot of mineral point count analyses
by Wagener (1965) of 40 samples collected from the East
Farrington pluton (including data from the Farrington
quadrangle). According to IUGS classification, the rocks
plot mainly within the granite field. Normalized whole rock
analysis from a sample (CH-5004) collected during the
current mapping from Pritchards Mill Creek near the
southern tip of University Lake indicates a granodiorite
composition.
CH-5004 Normalized
Alkali-Felds
Plagioclase
Modal analyses from point
counts of Wagener (1965)
Quartz
Zgr - Granite of the Chapel Hill pluton
QAP ternary diagram plot of normalized whole rock
analysis from sample CH-57.
CH-57
Sample collected from new building construction on UNCChapel Hill campus.
Alkali-Felds
Plagioclase
Quartz
Zgd – Granodiorite
Whole rock analysis from sample CH-150, collected from
the Duke Forest area, and sample CH-2401, collected from
outcrop located east of Boshamer Stadium on UNC
campus, indicate a granodiorite composition.
CH-150
CH-2401
Alkali-Felds
Plagioclase
Quartz
Whole rock analysis from sample CH-880 collected from
Morgan Creek approximately 2000 feet up stream from
University Lake indicates an quartz monzodiorite/granodiorite
composition.
CH-880
Alkali-Felds
Plagioclase
Quartz
Zdi – Diorite
Whole rock chemical analyses from rock samples of Bland,
1972 which were collected from his diorite bodies within the
Meadow Flats pluton were normalized and plotted on QAP
diagrams for this study. According to IUGS nomenclature, the
rocks plot as quartz monzodiorite and quartz diorite.
Bland 1972
Diorite data
Alkali-Felds
Zqmd– Quartz monzodiorite
Plagioclase
Quartz
Zqmd - Quartz monzodiorite: The rocks within the map areas
designated as quartz monzodiorite appear similar to the typical
diorite. Rare pinkish alkali feldspar is present in some samples
(specifically on the south side of Blackwood Mountain). Whole
rock chemical analyses from 9 rock samples of Bland, 1972
which were collected from his granodiorite bodies within the
Meadow Flats pluton were normalized and plotted on QAP
diagrams for this study. According to IUGS nomenclature, the
rocks previously categorized as granodiorite plot as quartz
monzodiorite.
Alkali-Felds
Plagioclase
Bland 1972
Granodiorite data
Zdi-fine – Fine-grained Diorite
Whole rock analysis from a sample collected near the
intersection of NC Hwy 86 (Airport Road) and Summerview
Drive (CH-746) indicates a quartz monzodiorite composition.
CH-746
Zgb – Gabbro
Whole rock chemical analyses from rock samples of Bland, 1972 which were collected
from his gabbros bodies within the Meadow Flats pluton were normalized and plotted on
QAP and Pl/Pyx/Ol diagrams for this study. According to IUGS nomenclature, the
composition of the rocks vary from gabbro, quartz gabbro, and quartz monzogabbro.
Plagioclase
Quartz
Bland 1972
data
CH-10
CH-1014
leucogabbro
Alkali-Felds
Plagioclase
Pyroxene
Olivine
Zum – Ultramafic
Whole rock analysis from a sample collected east of
Iron Mine Hill (CH-2027) plots within the olivineclinopyroxenite field on a Ol/Opx/Cpx ternary diagram.
CH-2027