Characteristics of Calcium Isotopes at Different Water Depths and Their Palaeoenvironmental Significance for Carbonate Rocks of the Permian-Triassic Boundary in Chibi, Southern China
Calcium isotopes of carbonate rocks can trace calcium cycles and record changes in the marine environment. As published calcium isotope profiles of carbonate rocks at the Permian-Triassic boundary are rare, comparative studies on deep-water profiles were lacking for the major extinction event that o...
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ftdoajarticles:oai:doaj.org/article:8a30c44bfd244a1f87be2c2bb0fddae3 2023-05-15T17:51:45+02:00 Characteristics of Calcium Isotopes at Different Water Depths and Their Palaeoenvironmental Significance for Carbonate Rocks of the Permian-Triassic Boundary in Chibi, Southern China Hongyu Zhao Junhua Huang 2022-11-01T00:00:00Z https://doi.org/10.3390/min12111440 https://doaj.org/article/8a30c44bfd244a1f87be2c2bb0fddae3 EN eng MDPI AG https://www.mdpi.com/2075-163X/12/11/1440 https://doaj.org/toc/2075-163X doi:10.3390/min12111440 2075-163X https://doaj.org/article/8a30c44bfd244a1f87be2c2bb0fddae3 Minerals, Vol 12, Iss 1440, p 1440 (2022) Permian-Triassic boundary South China calcium isotope diagenesis regression Mineralogy QE351-399.2 article 2022 ftdoajarticles https://doi.org/10.3390/min12111440 2022-12-30T22:37:03Z Calcium isotopes of carbonate rocks can trace calcium cycles and record changes in the marine environment. As published calcium isotope profiles of carbonate rocks at the Permian-Triassic boundary are rare, comparative studies on deep-water profiles were lacking for the major extinction event that occurred during this time. We present sections of different water depths in the Chibi area of southern China that we have selected for a comparative study. We analyzed carbon isotopes, calcium isotopes, as well as major and trace elements of carbonates from two sections (Chibi North and Chibi West) to obtain information on the volcanic activity, ocean acidification, as well as sea level rise and fall in the Chibi area during the mass extinction period. All carbon and calcium isotopes of carbonates from both sections are all negative after the mass extinction boundary. Carbonates from the Chibi North section have higher δ 44/40 Ca values and lower Sr/Ca ratios than the rocks from the Chibi West section. We propose that the negative bias of the calcium isotopes in the two sections result from diagenesis. Diagenesis transforms primary aragonite into calcite, showing the characteristics of high δ 44/40 Ca value and low Sr/Ca. By comparing our data with three published profiles of shallow-water carbonate rock, we recognize that calcium isotopes record gradients at different water depths. In the slope environment, the enhancement of pore fluid action near the coast caused an increase of the fluid buffer alteration, and we propose that a regression event occurred in the Chibi region during the Late Permian. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Minerals 12 11 1440 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Permian-Triassic boundary South China calcium isotope diagenesis regression Mineralogy QE351-399.2 |
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Permian-Triassic boundary South China calcium isotope diagenesis regression Mineralogy QE351-399.2 Hongyu Zhao Junhua Huang Characteristics of Calcium Isotopes at Different Water Depths and Their Palaeoenvironmental Significance for Carbonate Rocks of the Permian-Triassic Boundary in Chibi, Southern China |
topic_facet |
Permian-Triassic boundary South China calcium isotope diagenesis regression Mineralogy QE351-399.2 |
description |
Calcium isotopes of carbonate rocks can trace calcium cycles and record changes in the marine environment. As published calcium isotope profiles of carbonate rocks at the Permian-Triassic boundary are rare, comparative studies on deep-water profiles were lacking for the major extinction event that occurred during this time. We present sections of different water depths in the Chibi area of southern China that we have selected for a comparative study. We analyzed carbon isotopes, calcium isotopes, as well as major and trace elements of carbonates from two sections (Chibi North and Chibi West) to obtain information on the volcanic activity, ocean acidification, as well as sea level rise and fall in the Chibi area during the mass extinction period. All carbon and calcium isotopes of carbonates from both sections are all negative after the mass extinction boundary. Carbonates from the Chibi North section have higher δ 44/40 Ca values and lower Sr/Ca ratios than the rocks from the Chibi West section. We propose that the negative bias of the calcium isotopes in the two sections result from diagenesis. Diagenesis transforms primary aragonite into calcite, showing the characteristics of high δ 44/40 Ca value and low Sr/Ca. By comparing our data with three published profiles of shallow-water carbonate rock, we recognize that calcium isotopes record gradients at different water depths. In the slope environment, the enhancement of pore fluid action near the coast caused an increase of the fluid buffer alteration, and we propose that a regression event occurred in the Chibi region during the Late Permian. |
format |
Article in Journal/Newspaper |
author |
Hongyu Zhao Junhua Huang |
author_facet |
Hongyu Zhao Junhua Huang |
author_sort |
Hongyu Zhao |
title |
Characteristics of Calcium Isotopes at Different Water Depths and Their Palaeoenvironmental Significance for Carbonate Rocks of the Permian-Triassic Boundary in Chibi, Southern China |
title_short |
Characteristics of Calcium Isotopes at Different Water Depths and Their Palaeoenvironmental Significance for Carbonate Rocks of the Permian-Triassic Boundary in Chibi, Southern China |
title_full |
Characteristics of Calcium Isotopes at Different Water Depths and Their Palaeoenvironmental Significance for Carbonate Rocks of the Permian-Triassic Boundary in Chibi, Southern China |
title_fullStr |
Characteristics of Calcium Isotopes at Different Water Depths and Their Palaeoenvironmental Significance for Carbonate Rocks of the Permian-Triassic Boundary in Chibi, Southern China |
title_full_unstemmed |
Characteristics of Calcium Isotopes at Different Water Depths and Their Palaeoenvironmental Significance for Carbonate Rocks of the Permian-Triassic Boundary in Chibi, Southern China |
title_sort |
characteristics of calcium isotopes at different water depths and their palaeoenvironmental significance for carbonate rocks of the permian-triassic boundary in chibi, southern china |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/min12111440 https://doaj.org/article/8a30c44bfd244a1f87be2c2bb0fddae3 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Minerals, Vol 12, Iss 1440, p 1440 (2022) |
op_relation |
https://www.mdpi.com/2075-163X/12/11/1440 https://doaj.org/toc/2075-163X doi:10.3390/min12111440 2075-163X https://doaj.org/article/8a30c44bfd244a1f87be2c2bb0fddae3 |
op_doi |
https://doi.org/10.3390/min12111440 |
container_title |
Minerals |
container_volume |
12 |
container_issue |
11 |
container_start_page |
1440 |
_version_ |
1766159002017726464 |