DOI: 10.1002/2016GL069929
论文题名: Cosmogenic 32Si as a tracer of biogenic silica burial and diagenesis: Major deltaic sinks in the silica cycle
作者: Rahman S. ; Aller R.C. ; Cochran J.K.
刊名: Geophysical Research Letters
ISSN: 0094-8940
EISSN: 1944-8671
出版年: 2016
卷: 43, 期: 13 起始页码: 7124
结束页码: 7132
语种: 英语
英文关键词: 32Si
; authigenic clay formation
; marine silica cycle
; reverse weathering
Scopus关键词: Clay alteration
; Sedimentology
; Sediments
; Silicon
; Weathering
; Authigenic clays
; Biogenic silica
; Continental margin
; Deltaic deposits
; Diagenetic alteration
; Early diagenesis
; Silica cycle
; Specific activity
; Silica
; authigenic mineral
; biogenic material
; burial diagenesis
; chemical weathering
; clay mineral
; continental margin
; cosmogenic radionuclide
; deltaic deposit
; silicon
; tracer
英文摘要: Measurements of natural cosmogenic 32Si (t1/2 ~ 140 years) in tropical deltaic sediments demonstrate for the first time that most 32Si is present in rapidly formed authigenic clays and not biogenic opaline silica (bSi). The burial of bSi in deltaic and continental margin sediments has likely been greatly underestimated because of diagenetic alteration of bSi to clay, little of which dissolves in the classically used operational bSi leach. Rapid reverse weathering reactions during early diagenesis must be considered as a significant pathway of reactive Si storage in deltaic deposits. Based on 32Si, actual storage may be 2–3 times the best recent estimates extrapolated from diagenetic models or attempts to modify operational bSi methods to include authigenic clay (~900 µmol/g versus ~250 µmol/g). Measurements of natural 32Si inventories in sediments and initial specific activities in biogenic silica provide a means to independently constrain the marine Si cycle. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978537480&doi=10.1002%2f2016GL069929&partnerID=40&md5=eb34454d317d6ff9a0722cb324d6e380
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9903
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: School of Marine and Atmospheric Sciences, State University of New York at Stony Brook, Stony Brook, NY, United States
Recommended Citation:
Rahman S.,Aller R.C.,Cochran J.K.. Cosmogenic 32Si as a tracer of biogenic silica burial and diagenesis: Major deltaic sinks in the silica cycle[J]. Geophysical Research Letters,2016-01-01,43(13).