Geology, geochemistry, and geochronology of the Dunde iron-zinc ore deposit in western Tianshan, China

doi:10.1016/j.oregeorev.2013.08.019

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	Geology, geochemistry, and geochronology of the Dunde iron-zinc ore deposit in western Tianshan, China
	Duan, Shigang 1; Zhang, Zuoheng ; Jiang, Zongsheng ; Zhao, Jun 1; Zhang, Yongping 2; Li, Fengming 3; Tian, Jingquan 2
刊名	ORE GEOLOGY REVIEWS
	2014
卷号	57 页码:441-461
关键词	Skarn iron deposit Fluid inclusions Sulfur isotopes U-Pb dating Dunde Tianshan China
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2013.08.019
英文摘要	The Dunde iron-zinc deposit (185 Mt at 35% Fe), located in the Tianshan orogenic belt, Xinjiang, northwest China, is hosted in late Carboniferous volcanic-volcanidastic rocks characterized by prograde skam formation and retrograde alteration, but the ore lacks any clear spatial link with intrusive rocks. Four stages of skam formation and ore development can be recognized: (1) a prograde skarn stage that formed grossularitic garnet (Gr(39-80); Ad(15-58)) and diposidic pyroxene (Di(63-97)); (2) a retrograde skarn stage dominated by the formation of magnetite with minor epidote, ferropargasite, apatite, hematite, and trace amounts of titanite and spinel; (3) a sulfide stage dominated by the formation of arsenide (loellingite and arsenopyrite) and sulfide minerals (sphalerite, pyrrhotite, pyrite, chalcopyrite, and minor galena), calcite, and traces of quartz; and (4) a chloritecalcite stage mainly characterized by the formation of chlorite, calcite, and traces of sericite. Exsolution of droplet-like and patchy chalcopyrite is developed within sphalerite of the sulfide stage, indicating an exsolution temperature of 350-400 degrees C. As such, the crystallization temperature of early stage magnetite may have been >400 degrees C. Abundant fluid inclusions occur in calcite, which include daughter-mineral-bearing H2O, H2O, and pure H2O inclusions. The H2O inclusions have a wide range of homogenization temperatures from 147 degrees C to 367 degrees C with salinities of 2.4-23.4 wt% NaCl equivalent. The daughter-mineral-beating H2O inclusions have homogenization temperatures from 172 degrees C to 347 degrees C with salinities of 31.9-33.0 wt% NaCI equivalent. Using the chlorite geothermometer, the temperature of chlorite formation is constrained to be between 152 C and 222 degrees C (average = 194 degrees C). Sulfur isotope compositions of pyrrhotite, sphalerite, pyrite, and loellingite have a narrow range of delta S-34 values from 3.8%0 to 8.1%. (average delta S-34 = 6.8%.), suggesting that the sulfur was magmatic-derived. Zircon LA-ICP-MS U-Pb dating of wall rock dacite yields a weighted mean (206)pb/(238)u age of 316.0 +/- 1.7 Ma Combined with previous dating results of magnetite-mineralized diorite stocks, diorite dikes, and garnet skam, it can be inferred that the Dunde iron-zinc deposit formed in the late Carboniferous after 316 Ma and is genetically related to deep dioritic intrusions. During the late Carboniferous, the tectonic setting of this region changed from subduction-collision to extension, accompanied by mantle-derived magma underplating in deep. After the formation of the iron-zinc ore deposit, the Dunde district was intruded by an early Permian K-feldspar granite that yields a zircon LA-ICP-MS U-Pb age of 295.75 +/- 0.71 Ma. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	矿床地质
WOS关键词	ASIAN OROGENIC BELT ; CARBONIFEROUS VOLCANIC-ROCKS ; TRACE-ELEMENT GEOCHEMISTRY ; PHANEROZOIC CRUSTAL GROWTH ; YANGTZE-RIVER VALLEY ; SOUTH-CENTRAL PERU ; NW-CHINA ; TECTONIC EVOLUTION ; TIEN-SHAN ; NORTHWESTERN 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:000328869100027
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40427]
专题	中国地质调查局沈阳地质调查中心
作者单位	1.Chinese Acad Geol Sci, MLR Key Lab Metallogeny & Mineral Assessment, Inst Mineral Resources, Beijing 100037, Peoples R China 2.Changan Univ, Coll Earth Sci & Resources, Xian 710054, Peoples R China 3.Xinjiang Bur Geol & Mineral Resources, Korla 841000, Peoples R China 4.Xinjiang Bur Geol & Mineral Resources, Urumqi 830000, Peoples R China
推荐引用方式 GB/T 7714	Duan, Shigang,Zhang, Zuoheng,Jiang, Zongsheng,et al. Geology, geochemistry, and geochronology of the Dunde iron-zinc ore deposit in western Tianshan, China[J]. ORE GEOLOGY REVIEWS,2014,57:441-461.
APA	Duan, Shigang.,Zhang, Zuoheng.,Jiang, Zongsheng.,Zhao, Jun.,Zhang, Yongping.,...&Tian, Jingquan.(2014).Geology, geochemistry, and geochronology of the Dunde iron-zinc ore deposit in western Tianshan, China.ORE GEOLOGY REVIEWS,57,441-461.
MLA	Duan, Shigang,et al."Geology, geochemistry, and geochronology of the Dunde iron-zinc ore deposit in western Tianshan, China".ORE GEOLOGY REVIEWS 57(2014):441-461.