印度喜马拉雅地区Takche组(奥陶系-志留系)钙石的首次记录

IF 1.2 4区地球科学 Q2 Earth and Planetary Sciences

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI:10.1016/j.pgeola.2023.07.008

Olev Vinn , Ravi S. Chaubey , Birendra P. Singh , Om N. Bhargava , Subhay K. Prasad

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引用次数: 0

摘要

Takche组（Spiti，Himalaya）的石灰岩以晚奥陶世典型的正常海洋动植物群为特征。该植物区系以藻类为代表，主要以沉香和紫檀绿藻为代表。存在各种钙质微生物，如钙质淀粉、Rothletzella和Girvanella。塔克车组不同岩相的微体化石含量和丰度存在一定差异。根据藻类和钙质的丰度，可以识别出两种主要的生物相类型，即富藻生物相和贫藻生物相。塔克车组石灰岩中存在大量的轮叶绿藻，具有温暖气候的特征。喜马拉雅山脉（冈瓦纳大陆）的钙化层与巴尔蒂卡岛相同。

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The first record of calcitarchs from the Takche Formation (Ordovician–Silurian), Himalaya (India)

Limestones of the Takche Formation (Spiti, Himalaya) are characterized by normal marine fauna and flora typical for the Late Ordovician. The flora is represented by algae, mostly by receptaculitids and dasyclad green algae. Various calcareous microorganisms such as calcitarchs, Rothpletzella and Girvanella are present. There are some differences in the microfossil content and abundance between different lithofacies of the Takche Formation. Two main biofacies types could be recognized on the basis of the abundance of algae and calcitarchs, namely algal rich and algal poor biofacies. The abundance of dasyclad green algae in limestones of the Takche Formation is characteristic of the warm climate. The Himalaya (Gondwana) has calcitarchs in common with Baltica.

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来源期刊

Proceedings of the Geologists Association 地学-地质学

CiteScore

2.70

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： The Proceedings of the Geologists'' Association is an international geoscience journal that was founded in 1859 and publishes research and review papers on all aspects of Earth Science. In particular, papers will focus on the geology of northwestern Europe and the Mediterranean, including both the onshore and offshore record. Following a long tradition, the PGA will focus on: i) a range of article types (see below) on topics of wide relevance to Earth Sciences ii) papers on aspects of Earth Science that have societal relevance including geoconservation and Earth management, iii) papers on palaeoenvironments and palaeontology of the Mesozoic and Cenozoic, iv) papers on aspects of Quaternary geology and climate change, and v) papers on the history of geology with particular reference to individuals that have shaped the subject. These topics will also steer the content of the themes of the Special Issues that are published in the PGA.