Evidence of an early Permian palynomorphs in Ophiolitic Mélange of the Shyok Suture Zone, Eastern Karakoram, Ladakh, India
DOI:
https://doi.org/10.54991/jop.2023.1856Keywords:
Palynology, Early Permian, Shyok Suture Zone, Eastern Karakoram, Ladakh, IndiaAbstract
An Early Permian palynomorphs have been recorded for the first time from Ophiolitic Mélange of the Shyok Suture Zone, Eastern Karakoram, Ladakh, India. The characteristic taxa recorded in the assemblage are–Caheniasaccites diffusus, Crescentipollenites korbaensis, Distriatites bilateris, Faunipollenites varius, Ibisporites diplosaccus, Lacinitriletes badamensis, Lahirites parvus, Lunatisporites sp., Parasaccites korbaensis, Platysaccus brevizonatus, Plicatipollenites trigonalis, Potonieisporites mutabilis, Primuspollenites levis, Rhizomaspora indica, Scheuringipollenites tentulus, Striatites subtilis, Striasulcites ovatus, Striatopodocarpites gondwanensis and Verticipollenites secretus. The palynoflora recorded here reveals a typical early Permian age (Asselian–Sakmarian; 299.0–284.0 Ma) and affiliated to those described from the peninsular and extra–peninsular region of Lower Gondwana sediments of India as well as other core Gondwana continents. The study suggests that these palynomorphs were trapped remnants of the active continental margin of the Peri–Gondwanic Microcontinent/Kshiroda Plate that was cut off during subduction/integration processes between the Shyok–Suture–Zone of Ladakh and Karakoram Qiangtang Lhasa terrane and preserved in the Ophiolitic Mélange.
सारांश
भारत में लद्दाख के पूर्वी काराकोरम, के श्योक सीवन मंडल में स्थित ओफियोलिटिक मेलांज से पहली बार प्रारंभिक पर्मियन परागाणु संरूप अभिलिखित हुए हैं। समुच्चय में दर्ज किए गए विशेष टैक्सा जैसे कैहेनियासैकसाइट्स डिफ्यूसस, क्रिसेंटिपोलेनाइट्स कोरबेन्सिस, डिस्ट्रिएटाइट्स बिलाटेरिस, फौनिपोलेनाइट्स वेरियस, इबिस्पोराइट्स डिप्लोसैकस, लैकिनिट्रिलेटेस बैडामेंसिस, लाहिराइट्स पार्वस, लुनाटिसपोराइट्स एसपी/प्रजाति, पैरासैकसाइट्स कोरबेन्सिस, प्लैटिसैकस ब्रेविज़ोनेटस, प्लिकैटिपोलेनाइट्स ट्राइगोनलिस, पोटोनीस्पोराइट्स म्यूटाबिलिस, प्राइमसपोलेनाइट्स लेविस, राइज़ोमास्पोरा इंडिका, श्यूरिंगिपोलेनाइट्स टेंटुलस, स्ट्रिएटाइट्स सबटिलिस, स्ट्रियासुल्साइट्स ओवेटस, स्ट्रिएटोपोडोकार्पाइट्स गोंडवेनेंसिस और वर्टिसीपोलेनाइट्स सेक्रेटस हैं। यहां पर अभिलेखित किये गए परागाणुपुष्पों से प्रारंभिक पर्मियन आयु (एसेलियन-सैकमेरियन; 299.0-284.0 मिलियन वर्ष पूर्व) का पता चलता है तथा जो भारत के निचले गोंडवाना अवसादों के साथ-साथ कोर गोंडवाना महाद्वीप क्षेत्र के प्रायद्वीपीय एवं अतिरिक्त-प्रायद्वीप क्षेत्र में वर्णित परागाणु पुष्प से सम्बंधित है। अध्ययन से पता चलता है कि यह परागाणुसंरूप (पैलीनोमोर्फ) पेरी-गोंडवानिक माइक्रोकॉन्टिनेंट/क्षीरोडा प्लेटों के सक्रिय महाद्वीपीय उपांत के अटके हुए अवशेष थे, जो लद्दाख के श्योक-सिवनी-जोन/क्षेत्र एवं काराकोरम कियांगतांग ल्हासा इलाके के मध्य सबडक्शन/एकीकरण प्रक्रियाओं के दौरान कट गए थे तथा ओफियोलिटिक मेलांज में संरक्षित थे।
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