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Volcanic-subvolcanic rocks and tectonic setting of the Zhengguang intermediate sulfidation epithermal Au-Zn deposit, eastern Central Asian Orogenic Belt, NE China

文献类型：期刊论文

作者Wang, Le1,2,3; Qin, Kezhang1,2,3; Song, Guoxue3; Pang, Xuyong1,2; Li, Zhenzhen1,2; Zhao, Chao1,2,3; Jin, Luying1,2; Zou, Xinyu1,2,3; Li, Guangming1,2
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2018-10-01
卷号165页码:328-351
关键词U-Pb Sr-Nd In situ zircon Hf Zhengguang Au-Zn deposit Intermediate rocks Dacite porphyry Intermediate sulfidation epithermal deposit NE China
ISSN号1367-9120
DOI10.1016/j.jseaes.2018.07.023
英文摘要The Zhengguang Au-Zn deposit is a large epithermal deposit adjacent to the Tangshan and the Duobaoshan porphyry Cu deposits in the Duobaoshan ore field, NE China. The host rocks mainly consist of andesite, andesitic tuff, and volcanic breccia. There are also many diorite dikes and subvolcanic rocks, including dacite porphyry and andesite porphyry. This contribution presents the zircon U-Pb ages, whole rock elemental and Sr-Nd isotopic compositions and zircon in situ Hf isotopic data for volcanic and subvolcanic rocks at Zhengguang. The dating results show that there are at least three episodes of magmatic events in the Zhengguang area: first, the extrusion of main host andesite of the Duobaoshan Formation ( > 490 Ma); second, the emplacement of copious andesitic dikes (490-470 Ma); and finally, early Silurian intermediate magmatic activity (440-436 Ma). The dacite porphyry emplaced at 480 Ma has relatively high Si02 (63.5-64.7 wt%) and Sr (250-324 ppm) content, low Yb (0.59-0.67 ppm) and Y (5.65-6.63 ppm) content, and low initial 87Sr/86Sr ratios (0.7026-0.7031), suggesting an adakitic affinity. Given the positive eNd(t) values ( + 6.1 to + 7.1), eHf(t) values ( + 7.5 to + 13.5), high Mg# values (61-62), slightly high content of Cr (87.7-92.6 ppm), and Ni (37.6-46.9 ppm), we propose that the porphyry was derived from partial melting of subducted slabs of the Paleo-Asian oceanic plate with input from the mantle wedge during the ascent. The intermediate rocks can be divided into low Mg-andesitic rocks (LMAR, Mg# 33-54, Cr 14-144 ppm, and Ni 4-39 ppm) that originated from partial melting of the juvenile lower crust underplated by the mantle wedge -derived magma and high Mg-andesitic rocks (HMAR, Mg# 58-76, Cr 217-774 ppm, and Ni 81-419 ppm) derived from the partial melting of the slab fluid-metasomatic mantle wedge. The statistics of TOMS of zircon Hf suggest that certain amounts of Neoproterozoic (particularly 800-600 Ma) continental crust growth were involved in the eastern part of the Central Asian Orogenic Belt (CAOB), as evidenced in the Zhengguang area. Based on the geological relationship and mineralization style, we suggest that the Zhengguang deposit is an intermediate sulfidation epithermal deposit formed at ca. 480 Ma in a continental arc setting. Our work shows that Zhengguang is the oldest epithermal deposit in the CAOB and the oldest intermediate sulfidation (IS) epithermal deposit in the world. The identification of these characteristics is important for better understanding epithermal deposits in China and will add new insights about prospecting IS deposits in similar tectonic settings, especially in the CAOB.
WOS关键词DUOBAOSHAN ORE FIELD ; PORPHYRY COPPER MINERALIZATION ; UNDERPLATED BASALTIC CRUST ; ZIRCON REFERENCE MATERIAL ; HEILONGJIANG PROVINCE ; GOLD DEPOSIT ; NORTHEAST CHINA ; GEOLOGICAL SIGNIFICANCE ; CONTINENTAL-CRUST ; IGNEOUS ROCKS
资助项目National Natural Science Foundation of China[41390444] ; National Natural Science Foundation of China[41572064] ; Heilong Mining Co., LTD. ; UCAS Joint PhD Training Program
WOS研究方向Geology
语种英语
WOS记录号WOS:000449447300020
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Heilong Mining Co., LTD. ; Heilong Mining Co., LTD. ; UCAS Joint PhD Training Program ; UCAS Joint PhD Training Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Heilong Mining Co., LTD. ; Heilong Mining Co., LTD. ; UCAS Joint PhD Training Program ; UCAS Joint PhD Training Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Heilong Mining Co., LTD. ; Heilong Mining Co., LTD. ; UCAS Joint PhD Training Program ; UCAS Joint PhD Training Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Heilong Mining Co., LTD. ; Heilong Mining Co., LTD. ; UCAS Joint PhD Training Program ; UCAS Joint PhD Training Program
源URL[http://ir.iggcas.ac.cn/handle/132A11/89460]  
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Qin, Kezhang
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
推荐引用方式
GB/T 7714		 Wang, Le,Qin, Kezhang,Song, Guoxue,et al. Volcanic-subvolcanic rocks and tectonic setting of the Zhengguang intermediate sulfidation epithermal Au-Zn deposit, eastern Central Asian Orogenic Belt, NE China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,165:328-351.
APA Wang, Le.,Qin, Kezhang.,Song, Guoxue.,Pang, Xuyong.,Li, Zhenzhen.,...&Li, Guangming.(2018).Volcanic-subvolcanic rocks and tectonic setting of the Zhengguang intermediate sulfidation epithermal Au-Zn deposit, eastern Central Asian Orogenic Belt, NE China.JOURNAL OF ASIAN EARTH SCIENCES,165,328-351.
MLA Wang, Le,et al."Volcanic-subvolcanic rocks and tectonic setting of the Zhengguang intermediate sulfidation epithermal Au-Zn deposit, eastern Central Asian Orogenic Belt, NE China".JOURNAL OF ASIAN EARTH SCIENCES 165(2018):328-351.

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来源：地质与地球物理研究所

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