干旱区生态环境知识资源中心(Arid): Geology and geochronology of the Tiegelongnan porphyry-epithermal Cu (Au) deposit, Tibet, China: Formation, exhumation and preservation history

Arid

DOI	10.1016/j.oregeorev.2020.103575
	Geology and geochronology of the Tiegelongnan porphyry-epithermal Cu (Au) deposit, Tibet, China: Formation, exhumation and preservation history
	Yang, Chao; Tang, Juxing; Beaudoin, Georges; Song, Yang; Lin, Bin; Wang, Qin; Fang, Xiang
通讯作者	Yang, C
来源期刊	ORE GEOLOGY REVIEWS
ISSN	0169-1368
EISSN	1872-7360
出版年	2020
卷号	123
英文摘要	The Tiegelongnan (Rongna) deposit is a giant porphyry-epithermal Cu (Au) deposit within the Duolong porphyry district, in the south Qiangtang terrane, central-western Tibet, China. The deposit is centered on multiphase granodiorite porphyry (GP) intrusions intruded in Jurassic sandstone. Phase 1 and 2 GP are associated with biotite and sericite alteration, whereas GP3 and 4 occur in middle and shallow parts of the deposit affected by sericite and advanced argillic alteration (alunite-kaolinite-dickite-pyrophyllite). Sericite alteration is pervasive in the deep part of the deposit replacing biotite alteration and hosting porphyry stage chalcopyrite-bornitepyrite +/- molybdenite mineralization. Advanced argillic alterationis associated with epithermal stage high sulfidation (tennantite, enargite, bornite, and digenite) mineralization, overprints the sericite and biotite alteration from the shallow part of the deposit. The top of the Tiegelongnan hydrothermal system was weathered with a layer of supergene oxidation and enrichment zone, exhumated, and covered by andesite and gravel. Muscovite sampled from deep sericite alteration yields a Ar-40-Ar-39 age of 120.9 +/- 0.8 Ma, which is consistent with previously reported hydrothermal biotite Ar-40-Ar-39 age of 121.1 +/- 0.6 Ma, molybdenite Re-Os ages of 121.2 +/- 0.6 and 119.0 +/- 1.4 Ma, and GP 1 and 2 zircon U-Pb ages of 121.5 +/- 1.5, 120.2 +/- 1.0 Ma (LA-ICP-MS results), and 118.7 +/- 0.9 Ma (SIMS result). Phase 3 GP 3 yields a CA-ID-TIMS zircon U-Pb age of 119.9 +/- 0.2 Ma, which constrains the age of porphyry magmatic-hydrothermal events. The porphyry system was then unroofed, weathered, and superimposed by discrete stages of advanced argillic alteration and high sulfidation mineralization. Two pulses of alunite events yield Ar-40-Ar-39 ages of 116.3 +/- 0.8 Ma and 111.7 +/- 1.0 Ma, which represent the principal epithermal alteration and mineralization ages at Tiegelongnan. The first alunite pulse age is consistent with younger porphyry (GP4) age of 116.2 +/- 0.4 Ma (zircon LA-ICP-MS age). Weathering and exhumation of the porphyry-epithermal deposit were continuing until the cover of andesite at similar to 110 Ma and by post-andesite gravel. The andesite was affected by a younger weak hydrothermal alteration at 108.7 +/- 0.7 Ma, constrained by a muscovite Ar-40-Ar-39 age. Another barren alunite yields a Ar-40-Ar-39 age of 100.6 +/- 2.0 Ma, which may represent the youngest hydrothermal event. The long life-span discrete hydrothermal activities from similar to 120 to similar to 100 Ma in the Tiegelongnan deposit is consistent with the long-lasting tectonic-magmatic events of the Bangong-Nujiang suture zone. The discrete epithermal mineralization events at Tiegelongan are younger than the porphyry mineralization events, which is analogous to several other epithermal deposits worldwide. The similar to 10 m.y exhumation history at Tiegelongan is slower than the typical and rapid erosion history of similar to 1-2 m.y porphyry deposits in low-altitude tropical climates regions, and during a specific abrupt uplift pulse in the Andean region. The slow exhumation at Tiegelongnan is interpreted to be an integrated result of an arid climate environment, relatively flat topography, and a slow uplift condition during Cretaceous in central-western Tibet.
英文关键词	Muscovite Alunite Ar-40-Ar-39 Zircon CA-ID-TIMS Exhumation Porphyry-epithermal deposit
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000540196600016
WOS关键词	MAGMATIC-HYDROTHERMAL SYSTEM ; NUJIANG METALLOGENIC BELT ; HIGH-SULFIDATION DEPOSIT ; ZIRCON U-PB ; COPPER-DEPOSIT ; RE-OS ; DUOLONG PORPHYRY ; FUJIAN PROVINCE ; CU(AU) DEPOSIT ; OYU-TOLGOI
WOS类目	Geology ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324743
作者单位	[Yang, Chao; Beaudoin, Georges; Fang, Xiang] Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada; [Tang, Juxing; Song, Yang; Lin, Bin; Fang, Xiang] Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China; [Wang, Qin] Chengdu Univ Technol, Chengdu 610059, Peoples R China
推荐引用方式 GB/T 7714	Yang, Chao,Tang, Juxing,Beaudoin, Georges,et al. Geology and geochronology of the Tiegelongnan porphyry-epithermal Cu (Au) deposit, Tibet, China: Formation, exhumation and preservation history[J],2020,123.
APA	Yang, Chao.,Tang, Juxing.,Beaudoin, Georges.,Song, Yang.,Lin, Bin.,...&Fang, Xiang.(2020).Geology and geochronology of the Tiegelongnan porphyry-epithermal Cu (Au) deposit, Tibet, China: Formation, exhumation and preservation history.ORE GEOLOGY REVIEWS,123.
MLA	Yang, Chao,et al."Geology and geochronology of the Tiegelongnan porphyry-epithermal Cu (Au) deposit, Tibet, China: Formation, exhumation and preservation history".ORE GEOLOGY REVIEWS 123(2020).