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The A-type Pirrit Hills Granite, West Antarctica: an example of magmatism associated with the Mesozoic break-up of the Gondwana supercontinent

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Title
The A-type Pirrit Hills Granite, West Antarctica: an example of magmatism associated with the Mesozoic break-up of the Gondwana supercontinent
Other Titles
서남극 피릿힐 A-type 화강암: 곤드와나 초대륙 분리와 관련된 화성활동
Authors
Lee, Hyo Min
Choi, Seok Won
Kim, Jeongmin
Lee, Mi Jung
Lee, Jong Ik
Subject
Geology
Keywords
A-type granite; Gondwana supercontinent; Pirrit Hills; West Antarctica; continental break-up
Issue Date
2012
Publisher
대한지질학회/대한지질학회
Citation
Lee, Hyo Min, et al. 2012. "The A-type Pirrit Hills Granite, West Antarctica: an example of magmatism associated with the Mesozoic break-up of the Gondwana supercontinent". GEOSCIENCES JOURNAL, 16(4): 421-433.
Abstract
The Pirrit Hills granite occurs as an isolated pluton in the Ellsworth-Whitmore Mountains block, which is the center of five blocks in the present configuration. The granite consists of quartz, perthitic alkali feldspar, and plagioclase with minor amounts of interstitial biotite and muscovite. The granite is a highly homogeneous, strongly fractionated, and mildly peraluminous granite and belongs to A-type granites with A2-type characteristics, suggesting its generation in an anorogenic environment. The strong enrichment of HREE and significant negative Eu anomalies suggest that the granitic magma was produced by a small degree of partial melting of a garnet granulitic source in the unusually hot lower crust. A weighted mean 206Pb/238U age of zircons is 164.5±2.3 Ma (MSWD=1.3), which is 8 to 9 Mys younger than a former Rb-Sr whole rock age (173±3 Ma), and corresponds to the first rifting stage of the break-up of Gondwana (at 165 Ma). We suggest this age to be the emplacement age of the Pirrit Hills granite. The A-type Pirrit Hills granite was emplaced in the Middle Jurassic accompanying crustal thinning due to the break-up of Gondwana. with minor amounts of interstitial biotite and muscovite. The granite is a highly homogeneous, strongly fractionated, and mildly peraluminous granite and belongs to A-type granites with A2-type characteristics, suggesting its generation in an anorogenic environment. The strong enrichment of HREE and significant negative Eu anomalies suggest that the granitic magma was produced by a small degree of partial melting of a garnet granulitic source in the unusually hot lower crust. A weighted mean 206Pb/238U age of zircons is 164.5±2.3 Ma (MSWD=1.3), which is 8 to 9 Mys younger than a former Rb-Sr whole rock age (173±3 Ma), and corresponds to the first rifting stage of the break-up of Gondwana (at 165 Ma). We suggest this age to be the emplacement age of the Pirrit Hills granite. The A-type Pirrit
URI
http://repository.kopri.re.kr/handle/201206/6197
DOI
http://dx.doi.org/10.1007/s12303-012-0041-4
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