Geological characteristics and occurrence of gold in the large Nurkazgan glod-rich porphyry copper deposit, Kazakhstan

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

	Geological characteristics and occurrence of gold in the large Nurkazgan glod-rich porphyry copper deposit, Kazakhstan
	Feng HaoXuan 1,2,3; Shen Ping 1,2,3; Pan HongDi 4; Cao Chong 1,2,3; Seitmuratova, Eleonora 5
刊名	ACTA PETROLOGICA SINICA
	2018
卷号	34 期号:3 页码:763-784
关键词	Hydrothermal anhydrite Hydrothermal alteration Occurrence of gold Highly oxidized and sulfur-rich magmahydrothermal fluids system Gold-rich porphyry copper deposit Nurkazagan Kazakhastan
ISSN号	1000-0569
文献子类	Article
英文摘要	Nurkazgan gold-rich porphyry copper deposit, located in Central Kazakhastan, is an important Early Paleozoic porphyry copper-gold deposit in the western Central Asian Metallogenic Domain. Copper and gold mineralization is strongly linked with the emplacement of Early Silurian granodiorite porphyry and quartz diorite porphyrite. Ore-bodies, composed of disseminations, stockworks and widespread hydrothermal breccias of sulfides, are occurred in granodiorite porphyry, quartz diorite porphyrite and quartz diorite, as well as the outer volcanic rocks of Zhasor Formation. Within the deposit,it is characterized by abundant of hydrothermal magnetite and anhydrite, as well as rutile. Intensively hydrothermal alteration in Nurkazgan deposits is similar to other gold-rich porphyry copper deposits in the world, including early potassic-calcic silicate alteration (K-feldspar + actinolite) and propylitic alteration, then intermediate argillic alteration which widely developed within all intrusions, and late sericitic alteration. Copper mineralization is accompanied by potassic-calcic and intermediate argillic alterations and is consist of chalcopyrite, minor bornite and digenite. However, most gold mineralization is closely associated with intermediate argillic alteration, only minor occurred in potassic-calcic silicate alteration. Based on the scanning electron microscope (SEM) observation, the occurrence of gold is mainly as fine-grained native gold and electrum. In general, the grain size of them is less than 10 m. Native gold usually occurre in alteration rocks and is closely associated with silicate minerals in spatial (such as chlorite and illite) where native gold is mainly on their surface, among their grain boundaries, as inclusions in the crystal and minor within microfractures, while electrum is mainly encapsulated by chalcopyrite that cemented the breccias with intermediate argillic alteration. Our research suggest that the magma-hydrothermal fluid system in Nurkazgan is highly oxidized and sulfur -rich, in which the decrease of SO42-/H2S ratio and pH values by crystallizition of magnetite and anhydrite and disproportionation of SO2 dissolved in the highly oxidized fluids is likely to be responsible for most of gold deposition.
WOS关键词	EASTERN GANGDESE BELT ; ASIAN OROGENIC BELT ; ORE-FORMING FLUID ; CU-AU DEPOSIT ; ARC MAGMAS ; OXIDATION-STATE ; OXIDIZED MAGMAS ; SULFIDE ; SULFUR ; TIBET
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000431890500015
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88292]
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	Shen Ping
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Changan Univ, Coll Earth Sci, Xian 710054, Shaanxi, Peoples R China 5.K Satpaev Inst Geol Sci, Lab Geol Format, Alma Ata 050010, Kazakhstan
推荐引用方式 GB/T 7714	Feng HaoXuan,Shen Ping,Pan HongDi,et al. Geological characteristics and occurrence of gold in the large Nurkazgan glod-rich porphyry copper deposit, Kazakhstan[J]. ACTA PETROLOGICA SINICA,2018,34(3):763-784.
APA	Feng HaoXuan,Shen Ping,Pan HongDi,Cao Chong,&Seitmuratova, Eleonora.(2018).Geological characteristics and occurrence of gold in the large Nurkazgan glod-rich porphyry copper deposit, Kazakhstan.ACTA PETROLOGICA SINICA,34(3),763-784.
MLA	Feng HaoXuan,et al."Geological characteristics and occurrence of gold in the large Nurkazgan glod-rich porphyry copper deposit, Kazakhstan".ACTA PETROLOGICA SINICA 34.3(2018):763-784.