DOI: 10.1002/2016GL070474
论文题名: Deep carbon cycle recorded by calcium-silicate rocks (rodingites) in a subduction-related ophiolite
作者: Dai J.G. ; Wang C.S. ; Liu S.A. ; Qian X.Y. ; Zhu D.C. ; Ke S.
刊名: Geophysical Research Letters
ISSN: 0094-8369
EISSN: 1944-8100
出版年: 2016
卷: 43, 期: 22 起始页码: 11635
结束页码: 11643
语种: 英语
英文关键词: Cretaceous
; magnesium isotope
; Neo-Tethys
; ophiolite
; rodingite
; Yarlung Zangbo suture zone
Scopus关键词: Calcium
; Carbonates
; Hydraulic structures
; Isotopes
; Magnesium
; Silicate minerals
; Silicates
; Trace elements
; Cretaceous
; Magnesium isotopes
; Neo-Tethys
; ophiolite
; rodingite
; Calcium silicate
英文摘要: Carbon cycling in subduction zones remains poorly constrained due to the lack of relevant geological records. Here we report magnesium isotope data (δ26MgDSM3) from calcium-silicate rocks (rodingites) from the Xigaze ophiolite, southern Tibet, which is thought to represent remnants of Neo-Tethyan oceanic lithosphere. Behaviors of immobile trace elements in rodingites resemble those of their mafic dike protoliths, showing subduction-related signatures. The majority of rodingites exhibits low δ26Mg values of −0.72‰ to −0.33‰ with a weighted average of −0.47 ± 0.11‰ (2 SD), significantly lighter than that of their protoliths (−0.31 ± 0.03‰). This difference likely reflects the interaction of the protolith with isotopically light carbonate fluids. Modeling indicates that this hypothesis requires the input of 5 to 15 wt % carbonates during rodingitization. Our study suggests that rodingite may represent a previously unrecognized reservoir of dissolved Ca from subducted carbonates. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85004010257&doi=10.1002%2f2016GL070474&partnerID=40&md5=154db3737fed4e55c97d8d2576370ed4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9332
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: State Key Laboratory of Biogeology and Environmental Geology and School of Earth Sciences and Resources, China University of Geosciences, Beijing, China
Recommended Citation:
Dai J.G.,Wang C.S.,Liu S.A.,et al. Deep carbon cycle recorded by calcium-silicate rocks (rodingites) in a subduction-related ophiolite[J]. Geophysical Research Letters,2016-01-01,43(22).