Depth and mineralogy of the magma source or pause region for the Carboniferous Liberty Hill pluton, South Carolina
Journal Article
·
· Geology; (United States)
Use of Al content geobarometry on clinopyroxene inclusions in plagioclase from the Carboniferous Liberty Hill pluton, South Carolina, yields pressure estimates of 8-10 kbar. Amphibole crystallization pressures are 3.1-4.7 kbar; contact metamorphic pressure are 4.5 kbar. Clinopyroxenes could be early crystallization products from the melt, restite crystals from the source region, xenocrysts from the magma conduit walls, or xenocrysts from a more mafic magma. Compositional uniformity of granitoid clinopyroxenes but dissimilarity with those in contemporaneous gabbroids is evidence against a xenocrystic origin. The deeper depths are interpreted as either the source region or a pausing place important in the crystallization history of the magma during its ascent to the upper crust. Early crystallization assemblage of the granitoid, and possibly the assemblage of the source region, was amphibole + clinopyroxene +/- plagioclase-bearing. An amphibolitic lower crustal source is consistent with the Sr and O isotopic and rare-earth-element studies of this and many other similar-age granitoids in the southern Appalachians.
- Research Organization:
- North Carolina State Univ., Raleigh (USA)
- OSTI ID:
- 7188816
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 16:6; ISSN GLGYB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evolution of magmatic AFM mineral assemblages in granitoid rocks: the hornblende + melt = biotite reaction in the Liberty Hill pluton, South Carolina
Epidote-amphibolite to amphibolite facies transition in the southern Appalachian Piedmont: P-T conditions across the garnet and calc-silicate isograds
Origin of mafic xenoliths in granitoids of the central transantarctic Mountains, South Victoria Land (SVL), Antarctica
Journal Article
·
· Am. Mineral.; (United States)
·
OSTI ID:7150261
Epidote-amphibolite to amphibolite facies transition in the southern Appalachian Piedmont: P-T conditions across the garnet and calc-silicate isograds
Journal Article
·
Thu Jun 01 00:00:00 EDT 1989
· Geology; (USA)
·
OSTI ID:7000871
Origin of mafic xenoliths in granitoids of the central transantarctic Mountains, South Victoria Land (SVL), Antarctica
Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6875421
Related Subjects
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ALKALINE EARTH ISOTOPES
AMPHIBOLE
ANORTHOSITES
APPALACHIAN MOUNTAINS
CRYSTALLIZATION
DEPTH
DIMENSIONS
ELEMENTS
FEDERAL REGION IV
GABBROS
GEOBAROMETRY
GEOLOGIC DEPOSITS
IGNEOUS ROCKS
ISOTOPE RATIO
ISOTOPES
MAGMA
METALS
MINERALOGY
MINERALS
MOUNTAINS
NORTH AMERICA
OXYGEN ISOTOPES
PHASE TRANSFORMATIONS
PLUTONIC ROCKS
RARE EARTHS
RESERVOIR PRESSURE
ROCKS
SOUTH CAROLINA
STRONTIUM ISOTOPES
USA
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ALKALINE EARTH ISOTOPES
AMPHIBOLE
ANORTHOSITES
APPALACHIAN MOUNTAINS
CRYSTALLIZATION
DEPTH
DIMENSIONS
ELEMENTS
FEDERAL REGION IV
GABBROS
GEOBAROMETRY
GEOLOGIC DEPOSITS
IGNEOUS ROCKS
ISOTOPE RATIO
ISOTOPES
MAGMA
METALS
MINERALOGY
MINERALS
MOUNTAINS
NORTH AMERICA
OXYGEN ISOTOPES
PHASE TRANSFORMATIONS
PLUTONIC ROCKS
RARE EARTHS
RESERVOIR PRESSURE
ROCKS
SOUTH CAROLINA
STRONTIUM ISOTOPES
USA