Episodic magmatism at the Permian/Triassic crisis boundary and its linkage to underlying source rocks: constraints from conodont-based high-resolution geochemical proxies in marine carbonate successions, South China

IF 1.8 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

International Journal of Earth Sciences Pub Date : 2023-11-15 DOI:10.1007/s00531-023-02357-8

Chao Liu, Jing Ding, Wenzhao Sun, Xueying Luan, Shasha Sun, Yong Yang, Mengsen Feng, Tanen Jiang, Jiayu Li

{"title":"Episodic magmatism at the Permian/Triassic crisis boundary and its linkage to underlying source rocks: constraints from conodont-based high-resolution geochemical proxies in marine carbonate successions, South China","authors":"Chao Liu, Jing Ding, Wenzhao Sun, Xueying Luan, Shasha Sun, Yong Yang, Mengsen Feng, Tanen Jiang, Jiayu Li","doi":"10.1007/s00531-023-02357-8","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>Frequent magmatism was a major event causing the mass extinction across the Permian/Triassic Boundary. In the current study, we determined magmatism characteristics from the Pingdingshan section at the Permian/Triassic Boundary using conodont-based geochemical proxies at a high-resolution scale (~ 50 kyr). Integrated trace elements (Mn, Sr, Rb, and Th) and stable/radioactive isotopes (δ18O, δ13C, and 87Sr/86Sr) revealed that conodonts provided an ideal proxy for chemostratigraphic signatures of ancient seawater. The conodont-based, high-resolution 87Sr/86Sr isotopes from the studied interval (250.50–252.00 Ma) displayed three decreasing cycles upwardly against a long-term increasing background, reflecting three episodes of magmatism. As a contrast, the conodont-based, high-resolution δ18O isotopes from this interval exhibited no episodic pattern, indicating that the δ18O isotopes of conodonts were limitedly influenced by marine magmatism. The high-resolution δ13C values of micrites displayed a pattern consistent with the trend of long-term background, revealing that the δ13C signatures of episodic magmatism were not inherited by micrites. The magmatism associated with the EPME event exerted great influences upon the Chihsian source rocks by introducing massive heat through hydrothermal fluids and causing pervasive oceanic anoxia.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\n","PeriodicalId":13845,"journal":{"name":"International Journal of Earth Sciences","volume":"9 1","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1007/s00531-023-02357-8","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Frequent magmatism was a major event causing the mass extinction across the Permian/Triassic Boundary. In the current study, we determined magmatism characteristics from the Pingdingshan section at the Permian/Triassic Boundary using conodont-based geochemical proxies at a high-resolution scale (~ 50 kyr). Integrated trace elements (Mn, Sr, Rb, and Th) and stable/radioactive isotopes (δ¹⁸O, δ¹³C, and ⁸⁷Sr/⁸⁶Sr) revealed that conodonts provided an ideal proxy for chemostratigraphic signatures of ancient seawater. The conodont-based, high-resolution ⁸⁷Sr/⁸⁶Sr isotopes from the studied interval (250.50–252.00 Ma) displayed three decreasing cycles upwardly against a long-term increasing background, reflecting three episodes of magmatism. As a contrast, the conodont-based, high-resolution δ¹⁸O isotopes from this interval exhibited no episodic pattern, indicating that the δ¹⁸O isotopes of conodonts were limitedly influenced by marine magmatism. The high-resolution δ¹³C values of micrites displayed a pattern consistent with the trend of long-term background, revealing that the δ¹³C signatures of episodic magmatism were not inherited by micrites. The magmatism associated with the EPME event exerted great influences upon the Chihsian source rocks by introducing massive heat through hydrothermal fluids and causing pervasive oceanic anoxia.

Graphical abstract

Abstract Image

查看原文本刊更多论文

二叠纪/三叠纪危界幕式岩浆活动及其与下伏烃源岩的联系:华南海相碳酸盐岩层序牙形刺高分辨率地球化学指标的约束

摘要频繁的岩浆活动是造成二叠纪/三叠纪边界生物大灭绝的主要原因。在本研究中，我们利用高分辨率尺度(~ 50 kyr)的牙形刺地球化学指标，确定了二叠纪/三叠纪界线平顶山剖面的岩浆活动特征。综合微量元素(Mn、Sr、Rb和Th)和稳定/放射性同位素(δ18O、δ13C和87Sr/86Sr)表明，牙形刺是古海水化学地层特征的理想代表。研究区间(250.50 ~ 252.00 Ma)牙形牙体高分辨率87Sr/86Sr同位素在长期上升背景下呈3个上升递减旋回，反映了3期岩浆活动。而以牙形刺为基础的高分辨率δ18O同位素则没有出现幕式变化，表明牙形刺的δ18O同位素受海相岩浆作用的影响有限。泥晶的高分辨率δ13C值显示出与长期背景趋势一致的模式，表明幕式岩浆活动的δ13C特征并没有被泥晶所继承。与EPME事件相关的岩浆活动通过热液流体引入大量热量，造成普遍的海洋缺氧，对赤赤烃源岩产生了巨大影响。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

International Journal of Earth Sciences 地学-地球科学综合

CiteScore

4.60

自引率

4.30%

发文量

120

审稿时长

4-8 weeks

期刊介绍： The International Journal of Earth Sciences publishes process-oriented original and review papers on the history of the earth, including - Dynamics of the lithosphere - Tectonics and volcanology - Sedimentology - Evolution of life - Marine and continental ecosystems - Global dynamics of physicochemical cycles - Mineral deposits and hydrocarbons - Surface processes.