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球粒陨石表明印度东部半岛晚古生代大气缺氧。

Chondrites isp. indicating late paleozoic atmospheric anoxia in Eastern Peninsular India.

作者信息

Bhattacharya Biplab, Banerjee Sudipto

机构信息

Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India.

Department of Geology, Hooghly Mohsin College, Chinsurah, Hooghly, West Bengal 712101, India.

出版信息

ScientificWorldJournal. 2014 Jan 30;2014:434672. doi: 10.1155/2014/434672. eCollection 2014.

DOI:10.1155/2014/434672
PMID:24616628
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3926327/
Abstract

Rhythmic sandstone-mudstone-coal succession of the Barakar Formation (early Permian) manifests a transition from lower braided-fluvial to upper tide-wave influenced, estuarine setting. Monospecific assemblage of marine trace fossil Chondrites isp. in contemporaneous claystone beds in the upper Barakar succession from two Gondwana basins (namely, the Raniganj Basin and the Talchir Basin) in eastern peninsular India signifies predominant marine incursion during end early Permian. Monospecific Chondrites ichnoassemblage in different sedimentary horizons in geographically wide apart (~400 km) areas demarcates multiple short-spanned phases of anoxia in eastern India. Such anoxia is interpreted as intermittent falls in oxygen level in an overall decreasing atmospheric oxygenation within the late Paleozoic global oxygen-carbon dioxide fluctuations.

摘要

巴拉卡尔组（早二叠世）有节奏的砂岩-泥岩-煤层序显示出从下部辫状河相向上部受潮汐波浪影响的河口环境的转变。印度半岛东部两个冈瓦纳盆地（即兰尼根杰盆地和塔尔契尔盆地）上巴拉卡尔层序同期泥岩层中海洋遗迹化石Chondrites isp.的单种组合表明早二叠世末期主要发生了海侵。在地理上相距甚远（约400公里）的地区不同沉积层位中的单种Chondrites遗迹组合划定了印度东部多个短跨度的缺氧阶段。这种缺氧被解释为在晚古生代全球氧-二氧化碳波动中，大气氧含量总体下降过程中氧水平的间歇性下降。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/910118ab328c/TSWJ2014-434672.007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/f6dc7400bd3d/TSWJ2014-434672.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/5c687eaaaad7/TSWJ2014-434672.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/d0bd8ac90115/TSWJ2014-434672.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/8ef3b647785e/TSWJ2014-434672.004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/0bfdb78f1c06/TSWJ2014-434672.005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/c6ac79b1f616/TSWJ2014-434672.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/910118ab328c/TSWJ2014-434672.007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/f6dc7400bd3d/TSWJ2014-434672.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/5c687eaaaad7/TSWJ2014-434672.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/d0bd8ac90115/TSWJ2014-434672.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/8ef3b647785e/TSWJ2014-434672.004.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/c6ac79b1f616/TSWJ2014-434672.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/de6a/3926327/910118ab328c/TSWJ2014-434672.007.jpg

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