Indus-Yarlung-Tsangpo Suture Zone Concept- A Second Opinion
نویسندگان: ثبت نشده
چکیده مقاله:
It is believed that Greater India migrated from the southern hemisphere, collided with Gondwanaland, Angaraland and Cathaysia, thereby closing an intervening oceanic Tethys along the Indus-Yarlung-Tsangpo Suture Zone (IYTSZ).The suture zone is placed along the Chaman Fault in the Baluchistan-Afghanistan area in the west, and the Indus-Yarlung-Tsangpo in the north, whereas along the east from Thailand to the western Myanmar, identified as different features almost arbitrarily by various authors. However, the Chaman Fault shows younging southward with a number of breaks in the Baluchistan region and abruptly stops short of the coast, taking a sharp turn to the west. More important, the Indus- Yarlung-Tsangpo Suture Zone terminates at Rinbun to the west-southwest of Lhasa, and passes into Jurassic slates/ granites. The extensive Permo-Carboniferous fluvio-glacial deposits and the presence of Gondwana flora and fauna on either side of the Indus-Yarlung-Tsangpo suture suggest continental continuity from Peninsular India to northern Tibet in the Paleozoic. There was also a continuity of climatic zones from the Indian to the Tibetan side of the platform, atleast from Proterozoic to the Quaternary period. The presence of Triassic Gondwana vertebrates in China, Indochina, Mongolia, and Siberia supports free two-way land routes between India and aforesaid landmasses even in Mesozoic. Therefore, various geological arguments based on observed field data do not support the existence of Indus-Yarlung-Tsangpo Suture Zone as a suture zone of modern plate tectonic concept. Instead, it is better explained as a rift valley formed more than 100 Ma prior to supposed collision because the ophiolite emplacements confined to the north and south by steeply dipping faults.
منابع مشابه
Tectonic control of Yarlung Tsangpo Gorge revealed by a buried canyon in Southern Tibet.
The Himalayan mountains are dissected by some of the deepest and most impressive gorges on Earth. Constraining the interplay between river incision and rock uplift is important for understanding tectonic deformation in this region. We report here the discovery of a deeply incised canyon of the Yarlung Tsangpo River, at the eastern end of the Himalaya, which is now buried under more than 500 met...
متن کاملGEOMORPHOLOGY. Comment on "Tectonic control of Yarlung Tsangpo Gorge revealed by a buried canyon in Southern Tibet".
Wang et al. (Reports, 21 November, 2014, p. 978) describe a buried canyon upstream of the Yarlung Tsangpo Gorge and argue that rapid erosion of the gorge was merely a passive response to rapid uplift at ~2.5 million years ago (Ma). We view these data as an expected consequence emerging from feedbacks between erosion and crustal rheology active well before 2.5 Ma.
متن کاملResponse to Comment on “Tectonic control of Yarlung Tsangpo Gorge revealed by a buried canyon in Southern Tibet”
I n their Comment on our study (1), Zeitler et al. (2) imply that we interpreted our findings to question the possible existence of feedbacks between surface and tectonic processes, which is not the case. We therefore appreciate the opportunity to clarify potentialmisunderstandings. Zeitler et al. (2) suggest that the oldest sediments at the base of the valley fill could be 3 to 4 million years...
متن کاملGEOMORPHOLOGY. Response to Comment on "Tectonic control of Yarlung Tsangpo Gorge revealed by a buried canyon in Southern Tibet".
In their Comment, Zeitler et al. do not challenge our results or interpretation. Our study does not disprove coupling between tectonic uplift and erosion but suggests that this coupling cannot be the sole explanation of rapid uplift in the Himalayan syntaxes.
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The Qinghai-Tibet Plateau (QTP) is a biodiversity hotspot, resulting from its geological history, contemporary environment and isolation. Uplift of the QTP and Quaternary climatic oscillations are hypothesised to have influenced the genetic diversity, population structure and dynamics of all QTP endemic species. In this study, we tested this hypothesis by assaying variation at two mitochondrial...
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عنوان ژورنال
دوره 5 شماره 3
صفحات 218- 239
تاریخ انتشار 2017-04-01
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