Thermal History of Cambrian Burgess Shale-Type Deposits: New Insights from the Early Cambrian Chengjiang and Qingjiang Fossils of South China

IF 4.1 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Earth Science Pub Date : 2024-08-14 DOI:10.1007/s12583-023-1921-2
Yuheng Qiao, Linhao Cui, Guangyuan Xing, Dongjing Fu, Chao Chang, Robert Gaines, Xingliang Zhang
{"title":"Thermal History of Cambrian Burgess Shale-Type Deposits: New Insights from the Early Cambrian Chengjiang and Qingjiang Fossils of South China","authors":"Yuheng Qiao, Linhao Cui, Guangyuan Xing, Dongjing Fu, Chao Chang, Robert Gaines, Xingliang Zhang","doi":"10.1007/s12583-023-1921-2","DOIUrl":null,"url":null,"abstract":"<p>Burgess Shale-type deposits provide a wealth of information on the early evolution of animals. Questions that are central to understanding the exceptional preservation of these biotas and the paleoenvironments they inhabited may be obscured by the post-depositional alteration due to metamorphism at depth and weathering near the Earth’s surface. Among over 50 Cambrian BST biotas, the Chengjiang and Qingjiang deposits are well known for their richness of soft-bodied taxa, fidelity of preservation, and Early Cambrian Age. While alteration via weathering has been well-investigated, the thermal maturity of the units bearing the two biotas has not yet been elucidated. Here we investigate peak metamorphic temperatures of the two deposits using two independent methods. Paleogeotemperature gradient analyses demonstrate that the most fossiliferous sections of the Chengjiang were buried at a maximum depth of ∼8 500 m in the Early Triassic, corresponding to ∼300 °C, while the type area of the Qingjiang biota was buried at a maximum depth of ∼8 700 m in the Early Jurassic, corresponding to ∼240 °C. Raman geothermometer analyses of fossil carbonaceous material demonstrate that peak temperatures varied across localities with different burial depth. The two productive sections of the Chengjiang biota were thermally altered at a peak temperature of approximately 300 °C, and the main locality of the Qingjiang biota experienced a peak temperature of 238 ± 22 °C. These results from two independent methods are concordant. Among BST deposits for which thermal maturity has been documented, the Qingjiang biota is the least thermally mature, and therefore holds promise for enriching our understanding of BST deposits.</p>","PeriodicalId":15607,"journal":{"name":"Journal of Earth Science","volume":"69 1","pages":""},"PeriodicalIF":4.1000,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Earth Science","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1007/s12583-023-1921-2","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

Abstract

Burgess Shale-type deposits provide a wealth of information on the early evolution of animals. Questions that are central to understanding the exceptional preservation of these biotas and the paleoenvironments they inhabited may be obscured by the post-depositional alteration due to metamorphism at depth and weathering near the Earth’s surface. Among over 50 Cambrian BST biotas, the Chengjiang and Qingjiang deposits are well known for their richness of soft-bodied taxa, fidelity of preservation, and Early Cambrian Age. While alteration via weathering has been well-investigated, the thermal maturity of the units bearing the two biotas has not yet been elucidated. Here we investigate peak metamorphic temperatures of the two deposits using two independent methods. Paleogeotemperature gradient analyses demonstrate that the most fossiliferous sections of the Chengjiang were buried at a maximum depth of ∼8 500 m in the Early Triassic, corresponding to ∼300 °C, while the type area of the Qingjiang biota was buried at a maximum depth of ∼8 700 m in the Early Jurassic, corresponding to ∼240 °C. Raman geothermometer analyses of fossil carbonaceous material demonstrate that peak temperatures varied across localities with different burial depth. The two productive sections of the Chengjiang biota were thermally altered at a peak temperature of approximately 300 °C, and the main locality of the Qingjiang biota experienced a peak temperature of 238 ± 22 °C. These results from two independent methods are concordant. Among BST deposits for which thermal maturity has been documented, the Qingjiang biota is the least thermally mature, and therefore holds promise for enriching our understanding of BST deposits.

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
寒武纪伯吉斯页岩型矿床的热历史:华南早寒武世澄江和清江化石的新发现
伯吉斯页岩型矿床提供了大量有关动物早期演化的信息。由于深部变质作用和地表附近的风化作用,沉积后的蚀变可能会掩盖一些问题,而这些问题对于理解这些生物群的特殊保存情况及其所处的古环境至关重要。在 50 多个寒武纪生物群中,澄江和清江沉积以其丰富的软体类群、完整的保存和早寒武纪年龄而闻名。虽然通过风化作用发生的蚀变已经得到了很好的研究,但这两种生物群单元的热成熟度尚未得到阐明。在此,我们采用两种独立的方法对这两个矿床的变质峰值温度进行了研究。古地理温度梯度分析表明,澄江化石最多的地段在早三叠世最大埋藏深度为 8 500 米,相当于 300 ℃,而清江生物群类型区在早侏罗世最大埋藏深度为 8 700 米,相当于 240 ℃。对碳质化石材料进行的拉曼地温仪分析表明,不同埋藏深度的地方的峰值温度是不同的。澄江生物群的两个丰产层段的热变峰值温度约为 300 ℃,而清江生物群的主要地点的峰值温度为 238 ± 22 ℃。这两种独立方法得出的结果是一致的。在已记录热成熟度的 BST 矿床中,清江生物群的热成熟度最低,因此有望丰富我们对 BST 矿床的认识。
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 去求助
来源期刊
Journal of Earth Science
Journal of Earth Science 地学-地球科学综合
CiteScore
5.50
自引率
12.10%
发文量
128
审稿时长
4.5 months
期刊介绍: Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.
期刊最新文献
Quaternary Activity Characteristics and Regional Tectonic Significance of the Jiulong Fault in Jiujiang, Jiangxi Province, China Application of Detrital Apatite U-Pb Geochronology and Trace Elements for Provenance Analysis, Insights from a Study on the Yarlung River Sand Microstructures, Deformation Mechanisms and Seismic Properties of Synkinematic Migmatite from Southeastern Tibet: Insights from the Migmatitic Core of the Ailao Shan-Red River Shear Zone, Western Yunnan, China Paleozoic Multi-Stage Magmatic Events Related to Proto-Tethys and Paleo-Tethys Evolution: Insights from Intrusive Rocks in the Eastern Altyn Orogen, NW China Tracing Sources of Geochemical Anomalies in a Deeply Buried Volcanic-Related Hydrothermal Uranium Deposit: the Daguanchang Deposit, Northern Hebei Province, North China Craton
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1