Palynofloral, palaeovegetational and palaeoenvironmental investigations in the Lower Kamthi Formation of South India

Harinam Joshi; Neha Aggarwal; Neerja Jha

doi:10.54991/jop.2024.1872

Authors

Harinam Joshi Birbal Sahni Institute of Palaeosciences, 53, University Road, Lucknow 226007, India
Neha Aggarwal Birbal Sahni Institute of Palaeosciences, 53, University Road, Lucknow
Neerja Jha Birbal Sahni Institute of Palaeosciences, 53, University Road, Lucknow 226007, India

DOI:

https://doi.org/10.54991/jop.2024.1872

Keywords:

Palynology, Palynofacies, Guadalupian, Lopingian, Godavari Valley Coalfield

Abstract

These studies were carried out to better understand the palynostratigraphic and palaeoclimatic fluctuations observed in the floral ecosystem. The palynofloral investigation discovered two palynoassemblages (I-II). Faunipollenites spp. and Striatopodocarpites spp. dominate Palynoassemblage-I (430-232.10 m), with a high incidence of Striasulcites spp. Palynoassemblage-II (208.30-83.50 m) is distinguished by striate bisaccates and a high Densipollenites spp. frequency. Alisporites sp., Falcisporites nuthaliensis, Klausipollenites schaubergeri, Chordasporites australiensis, Guttulapollenites hannonicus, and Corisaccites alutus are the younger elements of these palynoassemblages. Guadalupian (Wordian-Capitanian) and Lopingian (Wuchiapingian-Changhsingian) ages have been assigned to the palynoassemblage I and II based on palynofloral evidence. Organic matter in various forms indicates four distinct palynofacies assemblages (PF I-IV). According to their findings, the sequence is dominated by the presence of sub-arborescent/arborescent forest cover that thrived in swampy settings near the depositional site. During deposition, the host sediments exhibit oxic to anoxic conditions as well as variable energy levels of the freshwater regime.

सारांश

पुष्पी पारिस्थितिक तंत्र में प्रेक्षित परागाणुस्तरिक और पुराजलवायवी उतार-चढ़ावों को बेहतर समझने हेतु ये अध्ययन किए गए। परागाणुपुष्पी अन्वेषण में दो परागाणुसमुच्चएं (I-II) अन्वेषित हुईं। स्ट्रिएसल्साइटीज जातियों के उन्नत आपतन सहित फानीपालेनाइटीज़ जातियों व स्ट्रिएटोपोडोकार्पाइटीज जातियों का परागाणुसमुच्चय-प्रथम (430-232.10 मीटर) पर प्राबल्य हैं। परागाणुसमुच्चय-द्वितीय (208.30-83.50 मीटर) रेखित द्विसपुट एवं उन्नत डेंसीपोलेनाइटीज जातियों की आवृत्ति से विभेदित है। अलीस्पोराइटीज जाति, फाल्सीस्पोराइटीज नुतेलिएंसिस, क्लौसीपोलेनाइटीज सायहाबेर्जेरी, कॉर्डास्पोराइटीज ऑस्ट्रेलिएन्सिस, गुट्टुलेपालेनाइटीज हैन्नोनिकस और कॉरीसेक्काईटीज एलुटस इन परागाणुसमुच्चयों के तरुणतर तत्व हैं। परागाणुपुष्पी प्रमाण के आधार पर गुआडालुपियन (वर्डियन-कैपिटेनियन) एवं लोपिंजियन (वुचियापिंजियन-चेंगसिंनियन) काल परागाणु समुच्चय-प्रथम एवं द्वितीय को निर्धारित किए गए हैं। विविध रूपों में कार्बनिक पदार्थ चार विशिष्ट परागाणु संलक्षणी समुच्चय (पीएफ I-IV) इंगित करता हैं। उनके निर्धारण के अनुसार, अनुक्रम में उप-वृक्षवत/वृक्षवत वन आच्छादन की विद्यमानता से अनुक्रम प्रभावित है जो निक्षेपणीय स्थल के समीप दलदली विन्यास में समृद्ध हो गया। निक्षेपण के दौरान, अतिथेय अवसाद ऑक्सी से अनाक्सी स्थितियाँ तथा अलवण जल प्रवृति के परिवर्तनीय ऊर्जा स्तर दर्शाते हैं।

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