扬子台地西南部奥陶系宝塔组底部含鲕绿泥石灰岩成因意义

陈思; 曾敏; 田景春; 任科法; 靳晓雨; 李晨伟

doi:10.3799/dqkx.2020.346

Volume 46 Issue 9

Oct. 2021

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Article Navigation > Earth Science > 2021 > 46(9): 3107-3122

Chen Si, Zeng Min, Tian Jingchun, Ren Kefa, Jin Xiaoyu, Li Chenwei, 2021. Chamosite-Ooidal Limestones at the Bottom of Ordovician Pagoda Formation in the Southwestern Yangtze Platform: Genesis and Paleoenvironmental Implications. Earth Science, 46(9): 3107-3122. doi: 10.3799/dqkx.2020.346

Citation:

Chen Si, Zeng Min, Tian Jingchun, Ren Kefa, Jin Xiaoyu, Li Chenwei, 2021. Chamosite-Ooidal Limestones at the Bottom of Ordovician Pagoda Formation in the Southwestern Yangtze Platform: Genesis and Paleoenvironmental Implications. Earth Science, 46(9): 3107-3122. doi: 10.3799/dqkx.2020.346

Citation:

Chen Si, Zeng Min, Tian Jingchun, Ren Kefa, Jin Xiaoyu, Li Chenwei, 2021. Chamosite-Ooidal Limestones at the Bottom of Ordovician Pagoda Formation in the Southwestern Yangtze Platform: Genesis and Paleoenvironmental Implications. Earth Science, 46(9): 3107-3122. doi: 10.3799/dqkx.2020.346

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Chamosite-Ooidal Limestones at the Bottom of Ordovician Pagoda Formation in the Southwestern Yangtze Platform: Genesis and Paleoenvironmental Implications

doi: 10.3799/dqkx.2020.346

Chen Si^{1
,
,},
Zeng Min^{1
,
,
,},
Tian Jingchun²,
Ren Kefa¹,
Jin Xiaoyu¹,
Li Chenwei¹

1.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
2.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2020-09-28
Available Online: 2021-10-14
Publish Date: 2021-10-14

Abstract

Abstract

A set of the chamosite-ooidal limestones was discovered at the bottom of the Pagoda Formation (Upper Ordovician) in Xingwen County, Sichuan Province, and its genesis can facilitate the understanding the evolution of the depositional environment in the southwestern Yangtze platform during the same period. Based on a detailed sedimentological analysis, this paper presents a study on the genesis of the chamosite-ooidal limestones, combined with mineralogical characterization via electron microprobe and scanning electron microscope studies. It is found that chamosite-rich ooids and peloids are syngenetic sediments, and symbiotic bioclastic assemblages indicate that the seawater was oxidizing. The abundant microbial-related fabric indicates that microbial mats develop during the same period, and their metabolic activities can lead to the formation of reducing water bodies near the water-sediment interface, which is a necessary condition for the formation of syngenetic chamosite. The Fe and Al elements needed for chamosite formation are derived from large-scale inputs of the early weathering crust during the transgression stage. The chamosite-ooidal limestones at the bottom of the Pagoda Formation are the concrete manifestation of global sea-level evolution in the Yangtze platform at same time. It is an important indicator of sea level fall in the Early Sandbian and rapid transgression in the Late Sandbian in the Yangtze platform.
- Yangtze platform,
- Pagoda Formation,
- chamosite ooids,
- microbial,
- sea-level change,
- sedimentology

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References(55)

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Chamosite-Ooidal Limestones at the Bottom of Ordovician Pagoda Formation in the Southwestern Yangtze Platform: Genesis and Paleoenvironmental Implications

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