印度西部褐煤矿始新世早期至中期古环境变化记录

IF 4.1 3区 地球科学 Q1 PALEONTOLOGY
S. Khanolkar, J. Sharma
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引用次数: 22

摘要

摘要在过去的十年里,印度西部的褐煤剖面记录了各种始新世高温事件。为了推断古环境,在印度温暖的古热带气候期间,我们评估了印度西部坎贝(Surkha)和巴默尔(Giral)盆地早始新世矿段以及库奇盆地(Matanomadh和Panandhro矿)始新世中期矿段的多个微体化石群,如花粉/孢子、甲藻和有孔虫。Surkha和Giral剖面显示出最重要元素(Arengapollenites achinatus、Longapertites retiplatus)、嗜热红树林棕榈Nypa和(亚)热带甲藻囊肿Apectodinium、Cordosphaeridium和Kenleyia的优势。这种坡缕石组合表明在炎热潮湿的气候中处于边缘海洋环境。在始新世中期,与印度西部始新世早期相比,在库奇盆地的Matanomadh和Panandhro矿段中,恐龙囊肿组合的多样性增加,并且大量元素的百分比下降。三陆生浮游有孔虫(Jenkinsina columbiana)和直海底有孔虫的大量繁殖(Brizalina sp.,Trifarina advena rajasthanensis)表明,库奇盆地褐煤区晚卢泰阶-早巴顿阶的富营养沉积条件,后来向巴顿阶转变为贫营养的开放海洋条件(浮游E12区)。这种贫营养条件的变化与库奇盆地木质素顶部浮游有孔虫多样性的急剧增加相吻合,这可能与在印度、巴基斯坦和澳大利亚的盆地中观察到的巴顿阶Kirthar–Wilson Bluff海侵事件有关,该事件可能与中始新世气候最佳期前后的海平面上升有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Record of Early to Middle Eocene paleoenvironmental changes from lignite mines, western India
Abstract. Various Eocene hyperthermal events have been recorded from lignite sections of western India in the past decade. To infer the paleoenvironment, during a warm paleotropical climate of India, we have assessed multiple microfossil groups like pollen/spores, dinoflagellates and foraminifera from Early Eocene lignite mine sections from the Cambay (Surkha) and Barmer (Giral) basins and Middle Eocene sections from the Kutch Basin (Matanomadh and Panandhro mines) of western India. The Surkha and Giral sections exhibit a dominance of rainforest elements (Arengapollenites achinatus, Longapertites retipilatus), thermophilic mangrove palm Nypa and (sub)tropical dinoflagellate cyst Apectodinium, Cordosphaeridium and Kenleyia. This palynomorph assemblage is indicative of a marginal marine setting within a hot and humid climate. During the Middle Eocene, the diversity of dinocyst assemblage increased and a decrease in percentage of mangrove elements was observed in the Matanomadh and Panandhro mine sections of the Kutch Basin as compared to the Early Eocene sections of western India. Bloom of triserial planktic (Jenkinsina columbiana) and rectilinear benthic (Brizalina sp., Trifarina advena rajasthanensis) foraminifera indicates eutrophic conditions of deposition during the Late Lutetian–Early Bartonian in the lignite sections of the Kutch Basin which later changed to oligotrophic, open marine conditions towards the Bartonian (planktic E12 zone). This change to oligotrophic conditions coincides with a drastic increase in diversity of planktic foraminifera in the top portion of lignite mines of the Kutch Basin which may be correlated with the Kirthar–Wilson Bluff transgression event in the Bartonian observed across basins in India, Pakistan and Australia potentially linked to sea level rise around the Middle Eocene Climatic Optimum.
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来源期刊
Journal of Micropalaeontology
Journal of Micropalaeontology 生物-古生物学
CiteScore
4.30
自引率
5.00%
发文量
7
审稿时长
>12 weeks
期刊介绍: The Journal of Micropalaeontology (JM) is an established international journal covering all aspects of microfossils and their application to both applied studies and basic research. In particular we welcome submissions relating to microfossils and their application to palaeoceanography, palaeoclimatology, palaeobiology, evolution, taxonomy, environmental change and molecular phylogeny.
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