DOI: 10.1016/j.epsl.2019.115940
论文题名: Carlin-style gold province linked to the extinct Emeishan plume
作者: Zhu J. ; Zhang Z. ; Santosh M. ; Jin Z.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 530 语种: 英语
中文关键词: Carlin-style Au deposit
; Emeishan large igneous province
; juvenile lower crust
; mantle plume
; Youjiang basin
英文关键词: Cobalt deposits
; Deposits
; Geochronology
; Oceanography
; Ores
; Oxygen
; Silicate minerals
; Thermal plumes
; Volcanic rocks
; Zircon
; Zircon deposits
; Crystal fractionation
; Emeishan large igneous provinces
; Hydrothermal activity
; Lower crust
; Mantle plume
; Sedimentary formation
; Sub-continental lithospheric mantles
; Youjiang basins
; Gold deposits
; crystal property
; enrichment
; fractionation
; fugacity
; geochemistry
; geochronology
; gold
; large igneous province
; mantle plume
; ore deposit
; oxygen isotope
; zircon
; China
; Emeishan
; Sichuan
; Youjiang Basin
英文摘要: Carlin-style gold deposits constitute one of the most important types of Au resources in the world. Previous studies on these deposits correlated the source of Au with metal-enriched sedimentary formations or metasomatized subcontinental lithospheric mantle (SCLM) associated with oceanic subduction. The role of mantle plumes in generating Carlin-style deposits has remained enigmatic due to lack of adequate evidence. Here we investigate the second largest Carlin-style Au province in the world, after Nevada in USA, within the Youjiang basin in the eastern part of the ∼260 Ma Emeishan large igneous province (LIP) of southwestern China. We present a novel model for the genesis of this ore province based on thermodynamic modeling, which envisages that cumulates formed by high degree (over ∼80 wt.%) of crystal fractionation from the Emeishan plume-derived magmas under low oxygen fugacity conditions generated an enriched juvenile lower crust. Our new results from integrated in situ zircon geochronology and oxygen isotopes of mineralized tuffs from the Au deposits hosted in the Emeishan volcanic rocks reveal zircon growth at ∼129–136 Ma and ∼239 Ma with δ18OVSMOW values of +5.9‰ to +6.9‰, suggesting that the gold mineralization events in the Youjiang basin followed the Emeishan plume activity and that the ore-forming fluids were of magmatic origin. In conjunction with evidence from the Emeishan LIP for native gold grains that precipitated in the early fractionation stage under low oxygen fugacity, we propose a model involving juvenile lower crust beneath the eastern Emeishan province as a potential Au reservoir, the reactivation of which by later magmatic-hydrothermal activity associated with oceanic subduction events generated the large auriferous province in the Youjiang basin. We therefore conclude that the crustal magmatic underplate generated by mantle plume has the potential to contribute to the formation of Carlin-style Au deposits, thus offering new insights into the possible link between mantle plumes and various types of Au deposits such as porphyry, sediment-hosted and orogenic Au deposits associated with LIPs. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165389
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China; Yunnan Institute of Geological Sciences, Kunming, 650051, China; Department of Earth Sciences, University of AdelaideSA 5005, Australia
Recommended Citation:
Zhu J.,Zhang Z.,Santosh M.,et al. Carlin-style gold province linked to the extinct Emeishan plume[J]. Earth and Planetary Science Letters,2020-01-01,530