Journal article
Calcium Isotopic Constraints on the Transition From Aragonite Seas to Calcite Seas in the Cambrian
GY Wei, AVS Hood, NJ Planavsky, D Li, HF Ling, LG Tarhan
Global Biogeochemical Cycles | Published : 2022
DOI: 10.1029/2021GB007235
Abstract
The primary mineralogy of marine carbonates has varied over geological time in concert with the secular evolution of global climate and seawater chemistry. Here, we employed a multi-proxy geochemical and petrographic approach, including measuring the Ca isotope (δ44Ca) and Sr content of Ediacaran–Cambrian carbonates, to provide new insights into the timing of the transition from a “dolomite-aragonite sea” to a “calcite sea” across the Ediacaran-Cambrian transition. We find robust evidence for the persistence of an aragonite sea well into Cambrian Age 2 (and potentially up through Age 4). Together with an updated petrographic compilation of abiotic carbonate precipitates (i.e., ooids and ceme..
View full abstractGrants
Awarded by David and Lucile Packard Foundation
Funding Acknowledgements
This study was funded by National Key Research and Development Program of China (2021YFA0718100); Fundamental Research Funds for Central Universities (14380125) and Frontiers Science Center for Critical Earth Material Cycling Fund (DLTD2102); the Strategic Priority Research Program (B) of the CAS (XDB26000000) and the NSFC program (42002002, 41872002). Guang-Yi Wei acknowledges support from the program A for Outstanding PhD. Candidate of NJU. Noah J. Planavsky acknowledges support from the Packard Foundation. Ashleigh v. S. Hood acknowledges support of an ARC DECRA DE190100988. We thank the editors, S. Pruss, and two anonymous reviewers for comments which improved this manuscript.