Discussions on the stress-chemical process of gold precipitation and metallogenic mechanism in shear zone type gold deposits

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 > 岩石圈演化国家重点实验室

	Discussions on the stress-chemical process of gold precipitation and metallogenic mechanism in shear zone type gold deposits
	Cheng NanNan 1,2; Liu Qing 1,2; Hou QuanLin 1,2; Wei Wei 1,2; Shi MengYan 1,2; He Miao 1,2; Guo QianQian 1,2
刊名	ACTA PETROLOGICA SINICA
	2018
卷号	34 期号:7 页码:2165-2180
关键词	Shear zone type gold deposits Stress concentration Boiling Flash vaporization Stress-chemistry Metallogenic mechanism
ISSN号	1000-0569
英文摘要	Most gold deposits in the world are related to shear zones, and the genesis of shear zones type gold deposits has long been a major concern in the geological study, while the precipitation mechanism of gold remains controversial and the cause at the ore-localized portions is seldom considered. This paper firstly sorts out and analysis the research progress of mineralization in recent years combining with the case studies of Jiaodong gold deposits. Using fault-valve model and stress-chemical theory, this paper finds that the ore-localized portions have close links to brittle fractures or joints (especially R, T and R' joints) and (multi-stage) pluton emplacement whether in brittle or ductile shear zones or vein type or altered rock type gold deposits, which are resulted from stress concentration. And the stress-chemical process, which is associated with the extreme decrease of fluid pressure and flash vaporization during the abrupt rupture, may be the effective mechanism of gold precipitation. In addition, fluids derived from multi-stage pluton emplacement are material basis of mineralization. Hence, this paper proposes that the stress-chemical process is the key process for gold precipitation in shear zones, which is from stress concentration, brittle fracturing, sudden reduction of fluid pressure, flash vaporization to gold precipitation. Additionally, the structural level of fracturing is not limited to brittle or brittle-ductile shear zones found from cases in domestic and overseas study, it can also occur in ductile shear zones though the concrete reason is not clear, which may be the critical metallogenic mechanism to ductile shear zones. Depending on above characteristics, the metallogenic mechanism in shear zones can be summarized as (multi-stage) pluton emplacement, hydrothermal fluid action, shearing action, brittle fracturing, sudden reduction of fluid pressure, flash vaporization and (gold) mineralization, which is a cycling process making large deposits eventually. And from this mechanism we suggest that the relatively concentrated portions of stress in shear zones, like the striking-turning positions in strike-slip faults, the dip turn-to-gentle positions in normal faults and turn-to-steep positions in thrust faults, are favorable areas for mineralization.
WOS关键词	FLUID INCLUSION GEOCHEMISTRY ; AR-40/AR-39 GEOCHRONOLOGY CONSTRAINTS ; QUARTZ-TOURMALINE VEIN ; NORTH CHINA CRATON ; VAL-DOR-DISTRICT ; JIAODONG PENINSULA ; GREENSTONE-BELT ; SHANDONG PROVINCE ; AQUEOUS-SOLUTIONS ; ORE GEOLOGY
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000451724300020
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/89642]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Hou QuanLin
作者单位	1.Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Cheng NanNan,Liu Qing,Hou QuanLin,et al. Discussions on the stress-chemical process of gold precipitation and metallogenic mechanism in shear zone type gold deposits[J]. ACTA PETROLOGICA SINICA,2018,34(7):2165-2180.
APA	Cheng NanNan.,Liu Qing.,Hou QuanLin.,Wei Wei.,Shi MengYan.,...&Guo QianQian.(2018).Discussions on the stress-chemical process of gold precipitation and metallogenic mechanism in shear zone type gold deposits.ACTA PETROLOGICA SINICA,34(7),2165-2180.
MLA	Cheng NanNan,et al."Discussions on the stress-chemical process of gold precipitation and metallogenic mechanism in shear zone type gold deposits".ACTA PETROLOGICA SINICA 34.7(2018):2165-2180.