A synthesis and new perspective on the petrogenesis of kamafugites from West Qin ling, China; in a global context

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	A synthesis and new perspective on the petrogenesis of kamafugites from West Qin ling, China; in a global context
	Guo, Pengyuan 1; Niu, Yaoling 2,3,4; Yu, Xuehui 4
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2014-01-05
卷号	79 期号:A 页码:86-96
关键词	West Qinling Kamafugite Petrogenesis Geochemistry Immiscibility
通讯作者	Guo, PY (reprint author), Lanzhou Univ, Sch Earth Sci, 222 Tianshui Rd, Lanzhou 730000, Gansu, Peoples R China.
英文摘要	We discuss the overall characteristics of a recently recognized kamafugite province in West Qinling, China, using field observations and geochemical data. We discuss the petrogenesis of the kamafugites using new bulk-rock major and trace element data and Sr-Nd isotope compositions of representative samples together with the literature data (in Chinese) and comparing them with type kamafugite suites from Italy, Brazil and Uganda. All these four kamafugite suites show OIB-like rare earth element (REE) patterns, but are much more enriched than OIB in the progressively more incompatible elements. The West Qinling kamafugite samples resemble closely the Ugandan and Brazilian suites in having a negative anomaly of K, P and Ti and a positive Nb-Ta anomaly, yet the Italian suite shows conspicuously a negative Nb-Ta anomaly. The four kamafugite suites have different 8Nd(t) values and 87Sr/86Sr1 ratios, implying their distinct sources and source histories. We consider that the ideal sources for.kamafugite magmas are most likely metasomatized sub-continental lithosphere with components of ancient seafloor subducted calcareous terrigenous sediments. The close association of kamafugite with carbonatite worldwide, including the West Qinling suite, is consistent with both being derived from a single CO2-rich silicate parental magma segregated during ascent as a result of decompression-induced immiscibility. In terms of both sources (or source histories) and processes, our simple interpretation can effectively explain the petrogenesis of all the apparently different kamafugite suites suggests that the petrogenesis of kamafugites may actually be simple. Further effort should aim to test whether our interpretation is indeed valid globally. (C) 2013 Elsevier Ltd. All rights reserved.
学科主题	Geology
收录类别	SCI
语种	英语
WOS记录号	WOS:000330604900008
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/23790]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Gansu, Peoples R China 2.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 3.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 4.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Guo, Pengyuan,Niu, Yaoling,Yu, Xuehui. A synthesis and new perspective on the petrogenesis of kamafugites from West Qin ling, China; in a global context[J]. JOURNAL OF ASIAN EARTH SCIENCES,2014,79(A):86-96.
APA	Guo, Pengyuan,Niu, Yaoling,&Yu, Xuehui.(2014).A synthesis and new perspective on the petrogenesis of kamafugites from West Qin ling, China; in a global context.JOURNAL OF ASIAN EARTH SCIENCES,79(A),86-96.
MLA	Guo, Pengyuan,et al."A synthesis and new perspective on the petrogenesis of kamafugites from West Qin ling, China; in a global context".JOURNAL OF ASIAN EARTH SCIENCES 79.A(2014):86-96.