Composition of plagioclases in volcanic rocks of King George Island, Antarctica with reference to the petrogenetic significance

极地研究 ›› 2000, Vol. 11 ›› Issue (2-English): 79-88.

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Composition of plagioclases in volcanic rocks of King George Island, Antarctica with reference to the petrogenetic significance

Xing Guangfu and Jin Qingmin

Antarctic Research Center, Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China

出版日期:1950-06-30 发布日期:1950-06-30
通讯作者: Xing Guangfu

Composition of plagioclases in volcanic rocks of King George Island, Antarctica with reference to the petrogenetic significance

Xing Guangfu and Jin Qingmin

Antarctic Research Center, Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China

Online:1950-06-30 Published:1950-06-30
Contact: Xing Guangfu

摘要/Abstract

摘要：

Plagioclases occur mainly as phenocrysts in volcanic rocks of King George Island, South Shetland Islands, West Antarctica. In basaltic andesites and andesites of Keller Peninsula and Ullman Spur (Admiralty Bay), they are high structure state labradorite andesines; and in high-Al basalts and basaltic andesites of Barton and Weaver peninsulas (Maxwell Bay), they are high structure state bytownite-anorthites. ∑REE, La/Yb ratios and δEu values of plagioclases from Admiralty Bay are higher than those from Maxwell Bay. All plagioclases have rather identical chondrite normalized transitional element distribution patterns, probably reflecting that crystal structure rather than composition of plagioclase controls their diversity. Compositions of plagioclases depend chiefly on those of their host rocks, compositional differences of plagioclases reveal that basaltic magmas in the Admiralty Bay area are more evolved than in the Maxwell Bay area.

关键词: composition of plagioclases, volcanic rocks, King George Island, Antarctica

Abstract:

Key words: composition of plagioclases, volcanic rocks, King George Island, Antarctica

Xing Guangfu, Jin Qingmin. Composition of plagioclases in volcanic rocks of King George Island, Antarctica with reference to the petrogenetic significance[J]. 极地研究, 2000, 11(2-English): 79-88.

Xing Guangfu, Jin Qingmin. Composition of plagioclases in volcanic rocks of King George Island, Antarctica with reference to the petrogenetic significance[J]. ADVANCES IN POLAR SCIENCE, 2000, 11(2-English): 79-88.

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Composition of plagioclases in volcanic rocks of King George Island, Antarctica with reference to the petrogenetic significance

Composition of plagioclases in volcanic rocks of King George Island, Antarctica with reference to the petrogenetic significance

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