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Change in Subduction Dip Angle of the Indian Continental Lithosphere Inferred From the Western Himalayan Eclogites
Chen, Si1,2,3; Chen, Yi1,2,4; Guillot, Stephane5; Li, Qiuli1,2,4
2022-02-03
Source PublicationFRONTIERS IN EARTH SCIENCE
Volume9Pages:12
AbstractThe occurrence of ultrahigh-pressure (UHP) and high-pressure (HP) rocks in the Himalayan orogen has been conventionally attributed to the different subduction dip angles along the strike. The western Himalayan UHP eclogites point to a steep continental subduction in the Eocene. The present-day geophysical data show low subduction dip angles of the Indian lithosphere beneath southern Tibet and Karakoram, implying that a shift from steep to low-angle subduction probably happened in the western Himalaya. However, the timing and mechanism of such a subduction-angle change are still unknown. Here we present a combined analysis of zircon geochronology and geochemistry of eclogites and gneiss in the Stak massif, western Himalaya. Metamorphic zircons equilibrated with garnet and omphacite show flat heavy rare earth element patterns without Eu anomalies and, thus, yield similar eclogite-facie ages of ca. 31 Ma. The Stak HP eclogite-facie metamorphism is at least 15 Ma younger than those measured in the western Himalayan UHP eclogites, but broadly contemporaneous with other Himalayan HP rocks. Therefore, all the Himalayan HP rocks record higher peak geothermal gradients and younger ages than those of the UHP rocks. Our new data, combined with the magmatic lull observed in the Kohistan-Ladakh-Gangdese arc and with the convergent rate of the Indian plate, suggest a change in subduction dip angle over time. Consequently, we suggest that the entire Indian continental lithosphere experienced an approximately coherent shift from steep to low-angle subduction after the breakoff of the Neo-Tethyan slab since the middle Eocene. This critical change in subduction geometry is interpreted to be responsible for the transition from continental subduction to collision dynamics.
KeywordHimalaya Stak eclogites zircon chronology subduction dip angle
DOI10.3389/feart.2021.790999
WOS KeywordINDUS SUTURE ZONE ; ZIRCON U-PB ; SLAB BREAKOFF ; PRESSURE METAMORPHISM ; NORTHWEST HIMALAYA ; NEOTETHYAN SLAB ; STAK ECLOGITE ; HF ISOTOPES ; EXHUMATION ; EOCENE
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000759819900001
PublisherFRONTIERS MEDIA SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104929
Collection岩石圈演化国家重点实验室
Corresponding AuthorChen, Yi
Affiliation1.Chinese Acad Sci, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Inst Geol & Geophys, Beijing, Peoples R China
3.Guangzhou Marine Geol Survey, Minist Nat Resources, Key Lab Marine Mineral Resources, Guangzhou, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
5.Univ Savoie Mt Blanc, Univ Grenoble Alpes, CNRS, IRD,IFSTTAR,ISTerre, Grenoble, France
Recommended Citation
GB/T 7714
Chen, Si,Chen, Yi,Guillot, Stephane,et al. Change in Subduction Dip Angle of the Indian Continental Lithosphere Inferred From the Western Himalayan Eclogites[J]. FRONTIERS IN EARTH SCIENCE,2022,9:12.
APA Chen, Si,Chen, Yi,Guillot, Stephane,&Li, Qiuli.(2022).Change in Subduction Dip Angle of the Indian Continental Lithosphere Inferred From the Western Himalayan Eclogites.FRONTIERS IN EARTH SCIENCE,9,12.
MLA Chen, Si,et al."Change in Subduction Dip Angle of the Indian Continental Lithosphere Inferred From the Western Himalayan Eclogites".FRONTIERS IN EARTH SCIENCE 9(2022):12.
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