DOI: 10.1016/j.epsl.2018.06.036
Scopus记录号: 2-s2.0-85049749330
论文题名: Unraveling histories of hydrothermal systems via U–Pb laser ablation dating of skarn garnet
作者: Gevedon M. ; Seman S. ; Barnes J.D. ; Lackey J.S. ; Stockli D.F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 498 起始页码: 237
结束页码: 246
语种: 英语
英文关键词: andradite
; garnet
; geochronology
; hydrothermal system
; Sierra Nevada
; skarn
Scopus关键词: Economic geology
; Geochronology
; Igneous rocks
; Laser ablation
; Mineral exploration
; Ore deposits
; Silicate minerals
; Zircon
; andradite
; Hydrothermal activity
; Hydrothermal system
; Mineral assemblage
; Pluton emplacement
; Sierra Nevada
; skarn
; Temporal relationships
; Garnets
; garnet
; geochronology
; hydrothermal system
; Jurassic
; radiocarbon dating
; skarn
; tectonic structure
; uranium-lead dating
; zircon
; California
; North American Cordillera
; Sierra Nevada [California]
; United States
英文摘要: Skarns are one of the few direct genetic links between magma and base metals in ore deposits, yet temporal relationships between skarns and their assumed causative plutons are rarely confirmed with radiometric formation ages. Skarns have been notoriously difficult to date directly due to a limited primary mineral assemblage, generally garnet and pyroxene. Discrepancies in timescales of skarn formation versus pluton emplacement emphasize our tenuous understanding of temporal relationships between plutons and hydrothermal systems including the duration of hydrothermal activity and skarn mineral growth rates. Here we apply a new method for U–Pb dating grossular-andradite (grandite) garnet via LA-ICP-MS and present the first comprehensive study to focus on U–Pb dates of primary skarn garnet. We present U–Pb age constraints on garnets from multiple skarns within the Jurassic and Cretaceous arcs of the North American Cordillera. Two case studies (Darwin and Empire Mountain skarns) illustrate the effectiveness of the U–Pb grandite method by demonstrating that garnet U–Pb ages agree within error of the pluton- and skarn-hosted U–Pb zircon ages. Two additional study localities (Black Rock and Mojave skarns) demonstrate the ability of grandite U–Pb ages to: 1) directly identify a causative igneous event, and 2) record timing of major tectonic events, specifically extensional to trans-tensional shifts in the Jurassic Mojave of California. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109755
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geological Sciences, University of Texas at Austin, Austin, TX 78712, United States; Geology Department, Pomona College, Claremont, CA 91711, United States; the Department of Geosciences, Pennsylvania State University, University Park, PA 16802, United States
Recommended Citation:
Gevedon M.,Seman S.,Barnes J.D.,et al. Unraveling histories of hydrothermal systems via U–Pb laser ablation dating of skarn garnet[J]. Earth and Planetary Science Letters,2018-01-01,498