Mineral chemistry and genesis of the Permian Cihai and Cinan magnetite deposits, Beishan, NW China

doi:10.1016/j.oregeorev.2017.01.019

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Mineral chemistry and genesis of the Permian Cihai and Cinan magnetite deposits, Beishan, NW China
	Tang, Dongmei 1; Qin, Kezhang 1; Chen, Bo 1; Mao, Yajing 1; Guo, Hu 2; Evans, Noreen J.3
刊名	ORE GEOLOGY REVIEWS
	2017-06-01
卷号	86 页码:79-99
关键词	Cihai and Cinan mafic intrusions Clinopyroxene Magnetite Mineralization mechanism Central Asian Orogenic Belt
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2017.01.019
文献子类	Article
英文摘要	Cihai and Cinan are Permian magnetite deposits related to mafic-ultramafic intrusions in the Beishan region, Xinjiang, NW China. The Cihai mafic intrusion is dominantly composed of dolerite, gabbro and fine-grained massive magnetite ore, while gabbro, pyrrhotite + pyrite-bearing clinopyroxenite and magnetite ore comprise the major units in Cinan. Clinopyroxene occurs in both deposits as 0.1-2 mm in diameter subhedral to anhedral grains in dolerite, gabbro and clinopyroxenite. High FeO contents (11.7-28.9 wt%), low SiO2 (43.6-54.3 wt%) and Al2O3 contents (0.15-6.08 wt%), and low total REE and trace element contents of clinopyroxene in the Cinan clinopyroxenite imply crystallization early, at high pressure. This clinopyroxene is FeO-rich and Si and Ti-poor, consistent with the clinopyroxene component of large-scale Cu-Ni sulfide deposits in the Eastern Tianshan and Panxi ares, as well as Tarim mafic intrusion and basalt, implying the Cinan mafic intrusion and sulfide is related to tectonic activity in the Tarim LIP. The similar mineral chemistry of clinopyroxene, apatite and magnetite in the Cihai and Cinan gabbros (e.g., depleted LREE, negative Zr, Hf, Nb and Ta anomalies in clinopyroxene, lack of Eu anomaly in apatite and similarity of oxygen fugacity as indicated by V in magnetite), indicate similar parental magmatic characteristics. Mineral compositions suggest a crystallization sequence of clinopyroxenite/with a small amount of sulfide - gabbro - magnetite ore in the Cinan deposit, and magnetite ore - gabbro dolerite in Cihai. The basaltic magma was emplaced at depth, with magnetite segregation (and formation of the Cinan magnetite ores) occurring in relatively low fO(2) conditions, after clinopyroxenite and gabbro fractional crystallization. The evolved Fe-rich basaltic magma rapidly rose to intermediate or shallow depths, forming an immiscible Fe-Ti oxide magma as fO(2) increased and leaving a Fe-poor residual magma in the chamber. The residual magmas was emplaced at different levels in the crust, forming the Cihai gabbro and dolerite, respectively. Finally, the immiscible Fe-Ti oxide magma was emplaced into the earlier formed dolerite because of late magma pulse uplift, resulting in a distinct boundary between the magnetite ores and dolerite. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词	ULTRAMAFIC LAYERED INTRUSION ; TELLNES ILMENITE DEPOSIT ; MAGMA CHAMBER PROCESSES ; FLUID-ROCK INTERACTION ; LARGE IGNEOUS PROVINCE ; ASIAN OROGENIC BELT ; RARE-EARTH-ELEMENTS ; FE-TI OXIDES ; TRACE-ELEMENTS ; SW CHINA
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000404064900006
资助机构	Nature Science Foundation of China(41472075) ; National Geological Survey Project of Altay and Junggar(DD2016006) ; Nature Science Foundation of China(41472075) ; National Geological Survey Project of Altay and Junggar(DD2016006) ; Nature Science Foundation of China(41472075) ; National Geological Survey Project of Altay and Junggar(DD2016006) ; Nature Science Foundation of China(41472075) ; National Geological Survey Project of Altay and Junggar(DD2016006)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/52009]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Tang, Dongmei; Qin, Kezhang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Geol Survey China, Tianjin Geol Res Ctr, Tianjin 300170, Peoples R China 3.Curtin Univ, TIGeR, John de Laeter Ctr, Appl Geol, Perth, WA 6845, Australia
推荐引用方式 GB/T 7714	Tang, Dongmei,Qin, Kezhang,Chen, Bo,et al. Mineral chemistry and genesis of the Permian Cihai and Cinan magnetite deposits, Beishan, NW China[J]. ORE GEOLOGY REVIEWS,2017,86:79-99.
APA	Tang, Dongmei,Qin, Kezhang,Chen, Bo,Mao, Yajing,Guo, Hu,&Evans, Noreen J..(2017).Mineral chemistry and genesis of the Permian Cihai and Cinan magnetite deposits, Beishan, NW China.ORE GEOLOGY REVIEWS,86,79-99.
MLA	Tang, Dongmei,et al."Mineral chemistry and genesis of the Permian Cihai and Cinan magnetite deposits, Beishan, NW China".ORE GEOLOGY REVIEWS 86(2017):79-99.