Massive formation of early diagenetic dolomite in the Ediacaran ocean: Constraints on the “dolomite problem”

Paleozoic and Precambrian sedimentary successions frequently contain massive dolomicrite [CaMg(CO3)2] units despite kinetic inhibitions to nucleation and precipitation of dolomite at Earth surface temperatures (100 °C, thus raising doubt about the validity of these deposits as archives of Earth surf...

Full description

Saved in:
Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2020-06, Vol.117 (25)
Main Authors: Chang, Biao, Li, Chao, Liu, Deng, Foster, Ian, Tripati, Aradhna, Lloyd, Max K., Maradiaga, Ingrid, Luo, Genming, An, Zhihui, She, Zhenbing, Xie, Shucheng, Tong, Jinnan, Huang, Junhua, Algeo, Thomas J., Lyons, Timothy W., Immenhauser, Adrian
Format: Article
Language:English
Subjects:
carbonate geochemistry
clumped isotope
Doushantuo Formation
early diagenesis
early oceans
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Paleozoic and Precambrian sedimentary successions frequently contain massive dolomicrite [CaMg(CO3)2] units despite kinetic inhibitions to nucleation and precipitation of dolomite at Earth surface temperatures (100 °C, thus raising doubt about the validity of these deposits as archives of Earth surface environments. We present a high-resolution, >63-My-long clumped-isotope temperature (TΔ47) record of shallow-marine dolomicrites from two drillcores of the Ediacaran (635 to 541 Ma) Doushantuo Formation in South China. Our T∆47record indicates that a majority (87%) of these dolostones formed at temperatures of
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1916673117