Tremendous crystal-Paracoquimbite and its pollytype coquimbite found for the first time in Hongshan Hs-epithermal Cu-Au deposit, eastern Tianshan, NW-China, and its significance

	Tremendous crystal-Paracoquimbite and its pollytype coquimbite found for the first time in Hongshan Hs-epithermal Cu-Au deposit, eastern Tianshan, NW-China, and its significance
	Qin KeZhang 1; Ding KuiShou 1; Xu YingXia 1,2; Miao Yu 1; Fang TongHui 3; Xu XingWang 1
刊名	ACTA PETROLOGICA SINICA
	2008-05-01
卷号	24 期号:5 页码:1112-1122
关键词	oxidization zone megacryst Paracoquimbite coquimbite polytype Hongshan HS-epithermal Cu-Au deposit east Tianshan mountains
ISSN号	1000-0569
文献子类	Article
英文摘要	A great number of tremendous glaucous crystals were found in middle-upper oxidization of HongshanCu-Au deposit, Kalatage district, eastern Tianslian, NW-China. The authors made systematic analysis such as XRD, TA and identified it is a rare kind of sulfate-Paracoquimbite [Fe-2 (SO4)(3) center dot 9H(2)O]. Paracoquimbite of Hongshan deposit was reported for the second in the world (first case reported at 1935 in Chile). And the Paracoquimbite megacryst ( d = 8cm similar to 12cm) of Hongshan deposit are much bigger and more rare than that ( d = 1. 95cm) of Chuquicamata porphyry copper deposit, in Northern Chile. Paracoquinibite occurs with its polytype coquimbite. The chemical analysis results of Paracoquimbite ( wt%) are: SO, 42, 55, Fe2O3, 28. 19, H2O 28. 72, CaO 0. 02, MgO 0. 01, Al2O3 0. 03, Na2O 0.02, total 99. 54; and its characteristic data of XRD analysis are: 4. 61 (100), 8. 89 (83), 3. 38 (67). The chemical analysis results of Coquimbite ( wt%) are: SO3 42. 31, Fe2O3 28. 61, H2O 28.98, MgO 0.01, Al2O3 0.01, total 99. 92; and its characteristic data of XRD analysis are: 8. 27 (100), 5. 46 (76), 2. 77 (76). The results of samples XRD and chemical analysis were furthermore confirmed through thermal, infrared spectrum and mossbauer spectrum analysis. Their thermal reaction and facies change mechanism were also explained. Systemetic EPMA analysis shows that At impurity in crystal lattice, disfigurement of crystal are important to polytype formation of paracoquimbite and coquimbite besides stack fault. The oxidization zone ties on the upper part with a depth of 50km similar to 60m. It is composed of natural elements, chlorides, Fe-oxide and sulfates with various colors, in which sulfate minerals dominated. Besides paracoquimbite, five minerals were founded in China for first time. Now these sulfate minerals have been used as a new type of acid-resource for copper smelting. So the Paracoquimbite megacrysts may be practicality and collection value.
WOS关键词	NORTHERN CHILE ; MINERAL CHEMISTRY ; ATACAMA DESERT ; LA-ESCONDIDA
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000259628700017
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/69674]
专题	中国科学院地质与地球物理研究所
通讯作者	Qin KeZhang
作者单位	1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Hebei Polytech Univ, Dept Geol, Tangshan 063009, Peoples R China 3.Beijing Inst Geol Mineral Resources, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Qin KeZhang,Ding KuiShou,Xu YingXia,et al. Tremendous crystal-Paracoquimbite and its pollytype coquimbite found for the first time in Hongshan Hs-epithermal Cu-Au deposit, eastern Tianshan, NW-China, and its significance[J]. ACTA PETROLOGICA SINICA,2008,24(5):1112-1122.
APA	Qin KeZhang,Ding KuiShou,Xu YingXia,Miao Yu,Fang TongHui,&Xu XingWang.(2008).Tremendous crystal-Paracoquimbite and its pollytype coquimbite found for the first time in Hongshan Hs-epithermal Cu-Au deposit, eastern Tianshan, NW-China, and its significance.ACTA PETROLOGICA SINICA,24(5),1112-1122.
MLA	Qin KeZhang,et al."Tremendous crystal-Paracoquimbite and its pollytype coquimbite found for the first time in Hongshan Hs-epithermal Cu-Au deposit, eastern Tianshan, NW-China, and its significance".ACTA PETROLOGICA SINICA 24.5(2008):1112-1122.