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Isotope Geochemistry of Volcanic Rocks from the Barton Peninsula, King George Island, Antarctica

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Title
Isotope Geochemistry of Volcanic Rocks from the Barton Peninsula, King George Island, Antarctica
Other Titles
남극 킹조지섬 바톤반도 화산암의 동위원소 지구화학
Authors
Jeong Hwang
Zheng Xiangshen
Dongbok Shin
Lee, Jong Ik
Edward M Ripley
Subject
Geology
Keywords
Antarctica; high temperature alteration; isotope; volcanic rock
Issue Date
2011
Publisher
중국
Citation
Jeong Hwang, et al. 2011. "Isotope Geochemistry of Volcanic Rocks from the Barton Peninsula, King George Island, Antarctica". Journal of Earth Science, 22(1): 40-51.
Abstract
C, O, H, S and Sr isotopes were investigated to characterize the isotopic composition of the Paleocene?Eocene volcanic rocks in Barton Peninsula, King George Island, Antarctica. The analyzed samples of volcanic rocks cover a range from basalt to andesite. The δ13C and δ18O values of calcite in volcanic rocks range from -7.5‰ to -3.2‰ and 0.4‰ to 5.1‰, respectively. The homogenous δ13Ccal and depleted δ18Ocal values relative to primary magmatic values reflect the effect of high temperature alteration of volcanic rocks. The δ18O of volcanic rocks ranges from -1.1‰ to 7.2‰, and the majority of values are significantly lower than those of primary magmatic values. The low δ18OWR values are compatible with high temperature alteration. The initial values of 87Sr/86Sr of volcanic rocks span a narrow range from 0.703 312 to 0.703 504 which belong to the present mid-oceanic ridge basalt. The values of 87Sr/86Sr of volcanics in the Barton Peninsula are similar to those determined in the Fildes Peninsula, King George Island. The δDWR and H2O contents of volcanic rocks range from - 74‰ to -66‰ and 0.67 wt.% to 2.74 wt.%, respectively. The higher δDWR and H2O wt.% of volcanic rocks relative to fresh basalts also result from high temperature alteration. Sulfur isotope compositions of the volcanic rocks range from -12.5‰ to -7.0‰;these values may represent fractionation from basalt to andesite. The δ13C and δ18O values of calcite in volcanic rocks range from -7.5‰ to -3.2‰ and 0.4‰ to 5.1‰, respectively. The homogenous δ13Ccal and depleted δ18Ocal values relative to primary magmatic values reflect the effect of high temperature alteration of volcanic rocks. The δ18O of volcanic rocks ranges from -1.1‰ to 7.2‰, and the majority of values are significantly lower than those of primary magmatic values. The low δ18OWR values are compatible with high temperature alteration. The initial values of 87
URI
http://repository.kopri.re.kr/handle/201206/6021
DOI
http://dx.doi.org/10.1007/s12583-011-0156-y
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