Petrography, Structures, and Petrofabrics of the Pinckneyville Quartz Diorite, Alabama

Gault, Hugh Richard

doi:10.1130/0016-7606(1945)56[181:psapot]2.0.co;2

Cited by 10 publications

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“…Elkahatchee pluton. This Paleozoic quartz diorite batholith (Gault, 1945;Bentley and Neathery, 1970;Russell, 1978;Drummond et al, 1994Drummond et al, , 1997 is characterized by a longwavelength (low-frequency) magnetic pattern that makes it one of the most distinctive units on the magnetic anomaly map. Extension of the Elkahatchee pluton beneath the Coastal Plain is clearly delineated by its characteristic magnetic pattern, which shows it to be one of the largest and most extensive bodies of plutonic rock in the southeastern United States.…”

Section: (A)mentioning

confidence: 99%

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We dedicate this paper to the memory of coauthor Isidore (Izzy) Zietz, who died at age 93 while this paper was in review. After contributing to the early theoretical foundation for analysis of airborne magnetic surveys, Izzy became a leading advocate for aeromagnetic survey acquisition and interpretation throughout the U.S., combining surveys into regional, state, and national maps, and working with regional geologists in interpreting geophysical anomalies. Like many geologists, we have been energized by Izzy's contagious enthusiasm for using magnetic and gravity anomalies to delineate and characterize major tectonic features. Lessons from working with him on data from Alabama and elsewhere over the years will continue to infl uence our appreciation and understanding of aeromagnetic and gravity anomalies for interpreting the Earth's upper crust."Magnetics is never good, and gravity is even worse!" "…all of it can just be dashed." -Isidore Zietz ABSTRACT Aeromagnetic and gravity data sets obtained for Alabama (United States) have been digitally merged and fi ltered to enhance upper-crustal anomalies. Beneath the Appalachian Basin in northwestern Alabama, broad deep-crustal anomalies of the continental interior include the Grenville front and New York-Alabama lineament (dextral fault). Toward the east and south, high-angle discordance between the northeast-trending Appalachians and the east-west-trending wedge of overlapping Mesozoic and Cenozoic Gulf Coastal Plain sediments reveals how bedrock geophysical signatures progressively change with deeper burial. Highfrequency magnetic anomalies in the Appalachian deformed domain (ADD) correspond to amphibolites and mylonites outlining terranes, while broader, lower-amplitude domains include Paleozoic intrusive bodies and Grenville basement gneiss. Fundamental ADD structures (e.g., the Alexander City, Towaliga, and Goat Rock-Bartletts Ferry faults) can be traced southward beneath the Gulf Coastal Plain to the suture with Gondwanan crust of the Suwannee terrane. Within the ADD, there is clear magnetic distinction between Laurentian crust and the strongly linear, high-frequency magnetic highs of peri-Gondwanan (Carolina-Uchee) arc terranes. The contact (Central Piedmont suture) corresponds to surface exposures of the Bartletts Ferry fault. ADD magnetic and gravity signatures are truncated by the eastwest-trending Altamaha magnetic low associated with the Suwannee suture. Arcuate northeast-trending magnetic linears of the Suwannee terrane refl ect internal structure and Mesozoic failed-rift trends. Geophysical data can be used to make inferences on surface and subsurface geology and vice versa, which has applicability anywhere that bedrock is exposed or concealed beneath essentially non-magnetic sedimentary cover.

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Section: (A)mentioning

confidence: 99%

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“…The Pinckneyville Granite (Alabama Geological Survey, 1926) has been described by Gault (1945) as the Pinckneyville Quartz Diorite. The rocks of this formation are dominantly dark-gray coarse grained biotite gneiss that have the composition of tonalite, though variants are recognized that range through monzotonalite, adamellite, and monzogran ite.…”

Section: Alabama Bedrockmentioning

confidence: 99%

Monazite in the granitic rocks of the southeastern Atlantic States: An example of the use of heavy minerals in geologic exploration

Mertie¹

1979

Professional Paper

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_________________________________________ Introduction ___________________________ Early work __________________________________ Present investigation _________________ Purpose of study _____________________________ Acknowledgment ___________________ Field conditions and methods ______________________ Saprolite ____________________________________ Use of accessory minerals ____________ Panning ______________________ Field processing of panned concentrates ____ Classification of granitic rocks proposed for weathered regions ______________ Nomenclature ___________________ Chemical composition _____________ Accessory minerals __________________ Stability and genetic significance __________ Mineralogical criteria relating to the origin of granitic rocks ____________________ Preservation of inherited characteristics ____ Variations in physical properties ___________ Unusual tenor for all accessory minerals Unusual tenor for one or two accessory minerals _________________ Anomalous amounts and composition of the iron ores _________________ Regional variation of accessory minerals and petrographically anomalous min erals ______________________

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“…Elkahatchee Quartz Diorite Gneiss.-The Elkahatchee is exposed in. large areas .of Coosa County and makes up the largest part of the Pinckneyville Granite complex (Adanis, 1926;Gault, 1945). The E lkahatchee generally is medium-to dark-gray rock of quartz-diorite composition with well defined gneissic banding.…”

Section: Piedmont Regionmentioning

confidence: 99%

“…Elkahatchee Quartz Diorite Gneiss.--The ~lkahatchee, is part of the Pinckneyville Granite complex Gault, 1945), and crops out over a broad area in southwestern Coosa County and northwestern Elmore County. Along most of the northwestern side of its outcrop,…”

Section: Plutonic Rocksmentioning

confidence: 99%

Geology of the Birmingham, Gadsden, and Montgomery 1 exp 0 X 2 exp 0 NTMS Quadrangles, Alabama.

Copeland¹,

Bég²

1979

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Petrography, Structures, and Petrofabrics of the Pinckneyville Quartz Diorite, Alabama

Cited by 10 publications

References 0 publications

Untitled

Untitled

Monazite in the granitic rocks of the southeastern Atlantic States: An example of the use of heavy minerals in geologic exploration

Geology of the Birmingham, Gadsden, and Montgomery 1 exp 0 X 2 exp 0 NTMS Quadrangles, Alabama.

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