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

Proceedings of the National Academy of Sciences of the United States of America
Biao ChangAdrian Immenhauser

Abstract

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 (<60 °C). This paradoxical observation is known as the "dolomite problem." Accordingly, the genesis of these dolostones is usually attributed to burial-hydrothermal dolomitization of primary limestones (CaCO3) at temperatures of >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∆47 record indicates that a majority (87%) of these dolostones formed at temperatures of <100 °C. When considering the regional thermal history, modeling of the influence of solid-state reordering on our TΔ47 record further suggests that most of the studied dolostones formed at temperatures of <60 °C, providing direct evidence of a low-temperature origin of these dolostones. Furthermore, calculated δ18O values of diagenetic fluids, rare earth element plus yttrium compositions, and petr...Continue Reading

References

Nov 1, 1991·Journal of Biomedical Materials Research·C OhtsukiT Yamamuro
Aug 28, 1998·Science·P F HoffmanD P Schrag
Feb 26, 2005·Science·Daniel CondonYugan Jin
Jun 11, 2010·Proceedings of the National Academy of Sciences of the United States of America·Benjamin H PasseyJohn M Eiler
Jun 13, 2018·Proceedings of the National Academy of Sciences of the United States of America·Uri Ryb, John M Eiler
Nov 18, 2018·Geochemistry, Geophysics, Geosystems : G³·Stefano M BernasconiMartin Ziegler

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