Palynological Study of the Eocene Kopili Shale, Assam-Arakan Basin, India

IF 1.4 4区地球科学 Q3 BIODIVERSITY CONSERVATION

Palaeobiodiversity and Palaeoenvironments Pub Date : 2024-02-16 DOI:10.1007/s12549-023-00598-8

Joya Moni Mout, Ranjan Kumar Sarmah

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Abstract

Palynological investigation was conducted to reconstruct the palaeodepositional and palaeoclimatic conditions of the late Eocene Kopili Shale of Assam-Arakan Basin (AAB), India. The palynoassemblage (PA) comprises particulate organic matters (POMs), dinoflagellate cysts (DCs), pteridophytic spores (PSs), angiospermous pollen (APs), acritarchs, fungal remains (FRs) and foraminiferal linings (FLs). Amorphous organic matter (AOM), making up 55 to 97 % of the PA, is the predominant form of organic matter (OM) among the POMs. The palynoflora is dominated by DCs comprising 5 genera (Cordosphaeridium, Hystrichosphaeridium, Heteraulacacysta, Glaphyrocysta and Thalassiphora) and 22 referable species. The PSs are assigned to 3 families (Polypodiaceae, Matoniaceae and Osmundaceae) and 8 referable species. The APs are characterised by 3 families (Arecaceae, Fabaceae and Gunneraceae) and 9 pollen species. The palynological data reveal that the Kopili Shale was deposited in a marginal-marine to shallow marine environment under suboxic-anoxic basin condition having influx of coastal elements into the depositional basin. The palaeoclimatic condition during the deposition of the Kopili Shale was tropical-subtropical and warm-humid.

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印度阿萨姆-阿拉干盆地始新世科皮里页岩的古生物学研究

为重建印度阿萨姆-阿拉干盆地（AAB）晚始新世科皮里页岩的古沉积和古气候条件，对该地区进行了古生物学调查。古植物群落（PA）包括颗粒有机物（POMs）、甲藻孢囊（DCs）、翼手目孢子（PSs）、被子植物花粉（APs）、针藻、真菌残骸（FRs）和有孔虫衬里（FLs）。无定形有机物（AOM）占 PA 的 55% 到 97%，是 POMs 中最主要的有机物（OM）形式。古植物以 DCs 为主，包括 5 个属（Cordosphaeridium、Hystrichosphaeridium、Heteraulacacysta、Glaphyrocysta 和 Thalassiphora）和 22 个可参考物种。PSs 被归入 3 个科（Polypodiaceae、Matoniaceae 和 Osmundaceae）和 8 个可参考物种。APs 有 3 个科（天南星科、豆科和贡纳科）和 9 个花粉物种。古植物学数据显示，科皮里页岩沉积于亚缺氧-缺氧盆地条件下的边缘海洋至浅海环境中，沉积盆地内有沿海元素涌入。科皮里页岩沉积期间的古气候条件为热带-亚热带和暖湿气候。

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来源期刊

Palaeobiodiversity and Palaeoenvironments BIODIVERSITY CONSERVATIONPALEONTOLOGY -PALEONTOLOGY

CiteScore

3.90

自引率

14.30%

发文量

期刊介绍： Palaeobiodiversity and Palaeoenvironments is a peer-reviewed international journal for the publication of high-quality multidisciplinary studies in the fields of palaeobiodiversity, palaeoenvironments and palaeobiogeography. Key criteria for the acceptance of manuscripts are a global scope or implications of problems on a global scale significant not only for a single discipline, a focus on the diversity of fossil organisms and the causes and processes of change in Earth’s history. The topics covered include: Systematic studies of all fossil animal / plant groups with a special focus on palaeoenvironmental investigations, palaeoecosystems and climate changes in Earth’s history, environment-organism interaction, comparison of modern and ancient sedimentary environments, palaeoecology and palaeobiogeography.