Unraveling the Lhasa-Qiangtang Collision in Western Tibet: Insights From Geochronological and Paleomagnetic Analyses,Geophysical Research Letters

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Unraveling the Lhasa-Qiangtang Collision in Western Tibet: Insights From Geochronological and Paleomagnetic Analyses
Geophysical Research Letters ( IF 4.6 ) Pub Date : 2024-07-18 , DOI: 10.1029/2024gl110264
Peiping Song ₁ , Lin Ding ₁ , Jinxiang Li ₁ , Yahui Yue ₁ , Jing Xie ₁

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The Lhasa-Qiangtang collision closed the Meso-Tethys Ocean, but the exact timing of this event remains hotly debated. Here, we present geochronological and paleomagnetic analyses conducted on Cretaceous volcanics from western Qiangtang to constrain the Lhasa-Qiangtang collision in western Tibet. Our investigations yield a paleolatitude of ∼30.5 ± 5.0°N for western Qiangtang during ca. 110–100 Ma. A reanalysis of previously acquired Mesozoic-Cenozoic paleomagnetic data from western Qiangtang suggests a stationary position during ca. 136–34 Ma. Examination of paleomagnetic data from western Lhasa reveals a significant reduction in northward paleolatitudinal motion during the Early Cretaceous, dropping from ∼12.3 cm/yr to nearly zero. Integration of our paleomagnetic findings with available geological records has led to conclude that the Lhasa-Qiangtang collision in western Tibet occurred at ca. 132 Ma. Additionally, we infer that crustal shortening on the order of ∼1,000 km happened between Lhasa and Qiangtang during the Early Cenozoic.

更新日期：2024-07-22

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