The origin of the Zhubumafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes

doi:10.1016/j.chemgeo.2017.02.009

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	The origin of the Zhubumafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes
	Tang, Qingyan 1; Zhang, Mingjie 1; Wang, Yuekun 1; Yao, Yunsheng 1; Du, Li 2; Chen, Liemeng 3; Li, Zhongping 1,2
刊名	CHEMICAL GEOLOGY
	2017-10-10
卷号	469 页码:47-59
关键词	Origins C-Hf-Sr-Nd isotopes Volatile compositions Mafic-ultramafic rocks Sulfide deposit Emeishan LIP SW China
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2017.02.009
文献子类	Article
英文摘要	The Zhubu mafic-ultramafic intrusion of the Permian Emeishan large igneous province (LIP), SW China hosts a magmatic Ni, Cu and platinum-group element (PGE) deposit. It consists of a layered sequence with sub-horizontal modal layering wrapped by a sub-vertical marginal zone. Our new zircon U-Pb isotopic dating gives a mean age of 263.2 +/- 5.6 Ma for the layered sequence. The volatiles extracted from the mineral separates of the Zhubu intrusion are composed of predominant H2O (11,769.84 mm(3) . STP/g, STP-standard temperature and pressure) and minor H-2 and CO2. The layered sequence has lower H2O but higher H-2, CO2, H2S and SO2 contents than themarginal zone. The CO2 and CH4 extracted at 400-900 degrees C and 900-1200 degrees C have light delta(CCO2)-C-13 varying from 17.45% to-7.10% and delta(CCH4)-C-13 varying from - 41.35% to - 22.88%. The pyroxene separates have significantly lower (Sr-87/Sr-86)(i) values (0.705882 to 0.708912) and slightly higher e(Nd) (t= 263 Ma) values (-2.8 to 0.7) than the whole rocks. The epsilon(Hf) (t= 263 Ma) values of zircon crystals vary from-3.05 to+1.90. The chemical compositions of volatiles from the Zhubu intrusion indicate a slightly reduced condition and aH(2)O-rich parentalmagma. The C-Hf-Sr-Nd isotopes for the Zhubu intrusion are consistent with similar to 15 wt% assimilation of the upper crust by a mantle-derived magma. The carbon isotopes indicate that a thermogenic component from sedimentary organic materials was present in the contaminated magma. A weak positive correlation between volatile and PGE contents, together with the C-Hf-Sr-Nd isotopes, indicates that sulfide saturation in the Zhubu magmawas triggered by crustal contamination including the addition of volatiles. (C) 2017 Elsevier B. V. All rights reserved.
WOS关键词	ORE-FORMING PROCESSES ; PLUME-LITHOSPHERE INTERACTION ; FLOOD-BASALT PROVINCE ; PGE SULFIDE DEPOSITS ; V OXIDE DEPOSITS ; GEOCHEMICAL CONSTRAINTS ; SOUTHWESTERN CHINA ; LAYERED INTRUSION ; CARBON-DIOXIDE ; MANTLE SOURCES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000412553200005
资助机构	Special Fund for the Land and Resources Scientific Research(201511020) ; NSF of China(41472070 ; Spec. Fund for the Doctoral Program of Higher Education(20120211110023) ; Key Project of Ministry of Education of the People's Republic of China(311010) ; Fundamental Research Funds for the Central Universities(lzujbky2015-64) ; Fund of Gansu Key Lab of Mineral Resources in Western China(WCRMGS-2014-04) ; 41372095) ; Special Fund for the Land and Resources Scientific Research(201511020) ; NSF of China(41472070 ; Spec. Fund for the Doctoral Program of Higher Education(20120211110023) ; Key Project of Ministry of Education of the People's Republic of China(311010) ; Fundamental Research Funds for the Central Universities(lzujbky2015-64) ; Fund of Gansu Key Lab of Mineral Resources in Western China(WCRMGS-2014-04) ; 41372095) ; Special Fund for the Land and Resources Scientific Research(201511020) ; NSF of China(41472070 ; Spec. Fund for the Doctoral Program of Higher Education(20120211110023) ; Key Project of Ministry of Education of the People's Republic of China(311010) ; Fundamental Research Funds for the Central Universities(lzujbky2015-64) ; Fund of Gansu Key Lab of Mineral Resources in Western China(WCRMGS-2014-04) ; 41372095) ; Special Fund for the Land and Resources Scientific Research(201511020) ; NSF of China(41472070 ; Spec. Fund for the Doctoral Program of Higher Education(20120211110023) ; Key Project of Ministry of Education of the People's Republic of China(311010) ; Fundamental Research Funds for the Central Universities(lzujbky2015-64) ; Fund of Gansu Key Lab of Mineral Resources in Western China(WCRMGS-2014-04) ; 41372095)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/61979]
专题	地质与地球物理研究所_兰州油气中心
通讯作者	Tang, Qingyan; Zhang, Mingjie
作者单位	1.Lanzhou Univ, Sch Earth Sci, Key Lab Mineral Resources Western China Gansu, Lanzhou 730000, Gansu, Peoples R China 2.Chinese Acad Sci, Gansu Prov Key Lab Petr Resources Res, Key Lab Petr Resource, Lanzhou 730000, Gansu, Peoples R China 3.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Guizhou, Peoples R China
推荐引用方式 GB/T 7714	Tang, Qingyan,Zhang, Mingjie,Wang, Yuekun,et al. The origin of the Zhubumafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes[J]. CHEMICAL GEOLOGY,2017,469:47-59.
APA	Tang, Qingyan.,Zhang, Mingjie.,Wang, Yuekun.,Yao, Yunsheng.,Du, Li.,...&Li, Zhongping.(2017).The origin of the Zhubumafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes.CHEMICAL GEOLOGY,469,47-59.
MLA	Tang, Qingyan,et al."The origin of the Zhubumafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes".CHEMICAL GEOLOGY 469(2017):47-59.