DOI: 10.1016/j.epsl.2020.116403
论文题名: Towards understanding the origin of massive dolostones
作者: Ning M. ; Lang X. ; Huang K. ; Li C. ; Huang T. ; Yuan H. ; Xing C. ; Yang R. ; Shen B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 545 语种: 英语
中文关键词: Cambrian
; Dolomite problem
; magnesium isotope
; sea level change
; sedimentary cycles
; South China
英文关键词: Deposition
; Lime
; Stratigraphy
; Cyclic deposition
; Dolomitization
; Dolomitization models
; Geochemical techniques
; Isotopic composition
; Sea-level fluctuations
; Sea-level oscillations
; Temporal and spatial
; Sea level
; Cambrian
; deposition
; dolomitization
; dolostone
; isotopic composition
; magnesium
; sea level change
; stratigraphy
; China
; Yangtze Platform
英文摘要: The origin of ancient massive dolostones, i.e. continuous dolostone sequence with a thickness >100 m and a platform-wide distribution, is the key issue of the ‘Dolomite Problem’ that cannot be clearly demonstrated by any existing dolomitization model individually or sequentially. It has been proposed that the massive dolostone could be generated by the stacking of multistage dolomitization events linked to the sea-level fluctuation, which results in repeatedly occurring of limestone precipitation-dolomitization cycles. However, the sequence of dolomitization events cannot be differentiated by any sedimentological or traditional geochemical techniques. Here we report Mg isotopic compositions of the massive dolostone (δ26Mgdol) from the middle Cambrian Qinjiamiao Formation (QJM) in the Yangtze Platform, South China, which consists of cyclic depositions of shoaling upward sequences. The stratigraphic variation of δ26Mgdol is coincident with the depositional cycles, suggesting the dolomitization might be periodic and be coupled with the sea-level oscillation. As dolomitization fluids experience changes in δ26Mg values during dolomitization processes, the intra-cycle stratigraphic δ26Mgdol profile reflects the processes of dolomitization. Our study indicates that the massive dolostone could be generated by the temporal and spatial stacking of multiple dolomitization events that are associated with sea-level fluctuation. If this model can be verified by other massive dolostone successions, the origin of massive dolostone may be resolved. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165185
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, China; State Key Laboratory of Continental Dynamics, Shannxi Key Laboratory of Early Life and Environment, Department of Geology, Northwest University, Xi'an, China; National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing, China
Recommended Citation:
Ning M.,Lang X.,Huang K.,et al. Towards understanding the origin of massive dolostones[J]. Earth and Planetary Science Letters,2020-01-01,545