Upper Pennsylvanian Age of the Lower Talchir Formation in the Wardha Basin, Central India, Based on Guide Palynomorphs Present in Radiometrically-Dated Palynozonations in South America, Africa, and Australia

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-08-31 DOI:10.5710/AMGH.29.03.2021.3423

P. S. Kavali, A. Roy, M. Pasquo, G. P. Gurumurthy, Gaurav Sharma, Ajit Kumar

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引用次数: 3

Abstract

Abstract. The age of the Talchir Formation corresponding to the lower part of the Gondwana (Permo–Carboniferous) Sequence in India is revised in the light of palynostratigraphic data associated with radiometric dating generated in Gondwana. New data was generated from seven samples of the Talchir Formation obtained from Well 131, located in the Penganga area of Wardha Valley Coalfield (Maharashtra State, central India). Two assemblages were demarcated based on the stratigraphic distribution of 63 species of spores (23 taxa), pollen grains (35 taxa), and phytoplankton. Palynoassociation I recognized in the two basal samples yielded few Punctatisporites spores and monosaccate pollen grains. Palynoassociation II is demarcated in the overlying three samples characterized by spores and pollen grains that are more diversified and abundant than in the other two samples. Several taxa (Concavissimisporites grumulus, Converrucosisporites confluens, Cyclogranisporites gondwanensis, Verrucosisporites andersonii, Latusipollenites quadrisaccatus, Marsupipollenites striatus, Pakhapites fusus, Striatoabieites multistriatus, Vittatina subsaccata, Vittatina vittifera) are shared with palynozones radiometrically constrained to the latest Pennsylvanian–early Cisuralian in Argentina, Brazil, Africa, and Australia. Therefore, we propose a Kasimovian to Ghezelian–Asselian age for the palynoassociations I and II of the Talchir Formation and a correlation with the Potonieisporites neglectus and Plicatipollenites gondwanensis Zones of Tiwari & Tripathi, respectively. This approach significantly improves the stratigraphic correlations of the Indian palynozones in Gondwana.

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印度中部Wardha盆地下Talchir组的上宾夕法尼亚时代——基于南美洲、非洲和澳大利亚辐射定年孢粉带中的Guide孢粉形态

摘要根据在印度冈瓦纳(Gondwana)产生的孢粉地层资料和放射性测年资料，修正了对应于冈瓦纳(二叠纪-石炭系)层序下部的Talchir组的年龄。新数据来自于位于Wardha Valley煤田(Maharashtra邦，印度中部)Penganga地区的131井Talchir组的7个样本。根据63种孢子(23个分类群)、花粉粒(35个分类群)和浮游植物的地层分布划分出两个组合。在两个基样中发现孢粉结合力产生少量点孢孢子和单糖花粉粒。孢粉结合体II在上覆的三个样品中划分，其孢子和花粉粒比其他两个样品更多样化和丰富。几个分类群(concavisimisporites grumulus, Converrucosisporites confluens, Cyclogranisporites gondwanensis, Verrucosisporites andersonii, Latusipollenites quadrisaccatus, Marsupipollenites striatus, Pakhapites fusus, Striatoabieites multistriatus, Vittatina subsacata, Vittatina vittifera)与辐射测定限制在阿根廷，巴西，非洲和澳大利亚的最新宾夕法尼亚-早期cisurian的孢粉带共享。因此，我们提出了Talchir组孢粉组合I和II的Kasimovian - ghezian - asselian年龄，并分别与Tiwari和Tripathi的Potonieisporites忽视带和Plicatipollenites gondwanensis带进行了对比。该方法显著提高了冈瓦纳地区印度孢粉带的地层相关性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.