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Limited underthrusting of India below Tibet: (3)He/(4)He analysis of thermal springs locates the mantle suture in continental collision
During continent–continent collision, does the downgoing continental plate underplate far inboard of the collisional boundary or does it subduct steeply into the mantle, and how is this geometry manifested in the mantle flow field? We test conflicting models for these questions for Earth’s archetypa...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
National Academy of Sciences
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8944758/ https://www.ncbi.nlm.nih.gov/pubmed/35302884 http://dx.doi.org/10.1073/pnas.2113877119 |
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author | Klemperer, Simon L. Zhao, Ping Whyte, Colin J. Darrah, Thomas H. Crossey, Laura J. Karlstrom, Karl E. Liu, Tianze Winn, Carmen Hilton, David R. Ding, Lin |
author_facet | Klemperer, Simon L. Zhao, Ping Whyte, Colin J. Darrah, Thomas H. Crossey, Laura J. Karlstrom, Karl E. Liu, Tianze Winn, Carmen Hilton, David R. Ding, Lin |
author_sort | Klemperer, Simon L. |
collection | PubMed |
description | During continent–continent collision, does the downgoing continental plate underplate far inboard of the collisional boundary or does it subduct steeply into the mantle, and how is this geometry manifested in the mantle flow field? We test conflicting models for these questions for Earth’s archetypal continental collision forming the Himalaya and Tibetan Plateau. Air-corrected helium isotope data ((3)He/(4)He) from 225 geothermal springs (196 from our group, 29 from the literature) delineate a boundary separating a Himalayan domain of only crustal helium from a Tibetan domain with significant mantle helium. This 1,000-km-long boundary is located close to the Yarlung-Zangbo Suture (YZS) in southern Tibet from 80 to 92°E and is interpreted to overlie the “mantle suture” where cold underplated Indian lithosphere is juxtaposed at >80 km depth against a sub-Tibetan incipiently molten asthenospheric mantle wedge. In southeastern Tibet, the mantle suture lies 100 km south of the YZS, implying delamination of the mantle lithosphere from the Indian crust. This helium-isotopic boundary helps resolve multiple, mutually conflicting seismological interpretations. Our synthesis of the combined data locates the northern limit of Indian underplating beneath Tibet, where the Indian plate bends to steeper dips or breaks off beneath a (likely thin) asthenospheric wedge below Tibetan crust, thereby defining limited underthrusting for the Tibetan continental collision. |
format | Online Article Text |
id | pubmed-8944758 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | National Academy of Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-89447582022-06-14 Limited underthrusting of India below Tibet: (3)He/(4)He analysis of thermal springs locates the mantle suture in continental collision Klemperer, Simon L. Zhao, Ping Whyte, Colin J. Darrah, Thomas H. Crossey, Laura J. Karlstrom, Karl E. Liu, Tianze Winn, Carmen Hilton, David R. Ding, Lin Proc Natl Acad Sci U S A Physical Sciences During continent–continent collision, does the downgoing continental plate underplate far inboard of the collisional boundary or does it subduct steeply into the mantle, and how is this geometry manifested in the mantle flow field? We test conflicting models for these questions for Earth’s archetypal continental collision forming the Himalaya and Tibetan Plateau. Air-corrected helium isotope data ((3)He/(4)He) from 225 geothermal springs (196 from our group, 29 from the literature) delineate a boundary separating a Himalayan domain of only crustal helium from a Tibetan domain with significant mantle helium. This 1,000-km-long boundary is located close to the Yarlung-Zangbo Suture (YZS) in southern Tibet from 80 to 92°E and is interpreted to overlie the “mantle suture” where cold underplated Indian lithosphere is juxtaposed at >80 km depth against a sub-Tibetan incipiently molten asthenospheric mantle wedge. In southeastern Tibet, the mantle suture lies 100 km south of the YZS, implying delamination of the mantle lithosphere from the Indian crust. This helium-isotopic boundary helps resolve multiple, mutually conflicting seismological interpretations. Our synthesis of the combined data locates the northern limit of Indian underplating beneath Tibet, where the Indian plate bends to steeper dips or breaks off beneath a (likely thin) asthenospheric wedge below Tibetan crust, thereby defining limited underthrusting for the Tibetan continental collision. National Academy of Sciences 2022-03-18 2022-03-22 /pmc/articles/PMC8944758/ /pubmed/35302884 http://dx.doi.org/10.1073/pnas.2113877119 Text en Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
spellingShingle | Physical Sciences Klemperer, Simon L. Zhao, Ping Whyte, Colin J. Darrah, Thomas H. Crossey, Laura J. Karlstrom, Karl E. Liu, Tianze Winn, Carmen Hilton, David R. Ding, Lin Limited underthrusting of India below Tibet: (3)He/(4)He analysis of thermal springs locates the mantle suture in continental collision |
title | Limited underthrusting of India below Tibet: (3)He/(4)He analysis of thermal springs locates the mantle suture in continental collision |
title_full | Limited underthrusting of India below Tibet: (3)He/(4)He analysis of thermal springs locates the mantle suture in continental collision |
title_fullStr | Limited underthrusting of India below Tibet: (3)He/(4)He analysis of thermal springs locates the mantle suture in continental collision |
title_full_unstemmed | Limited underthrusting of India below Tibet: (3)He/(4)He analysis of thermal springs locates the mantle suture in continental collision |
title_short | Limited underthrusting of India below Tibet: (3)He/(4)He analysis of thermal springs locates the mantle suture in continental collision |
title_sort | limited underthrusting of india below tibet: (3)he/(4)he analysis of thermal springs locates the mantle suture in continental collision |
topic | Physical Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8944758/ https://www.ncbi.nlm.nih.gov/pubmed/35302884 http://dx.doi.org/10.1073/pnas.2113877119 |
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