Zircon SHRIMP U-Pb ages of the Gangdese Batholith and implications for Neotethyan subduction in southern Tibet

Da Ren Wen, Dunyi Liu, Sun Lin Chung, Mei Fei Chu, Jianqing Ji, Qi Zhang, Biao Song, Tung-Yi Lee, Meng-Wan Yeh, Ching Hua Lo

Research output: Contribution to journalArticle

360 Citations (Scopus)

Abstract

The Trans-Himalayan magmatism, which occurred extensively in the Lhasa terrane of southern Tibet, has long been related to the Neotethyan subduction before the India-Asia collision. To better delineate the magmatic duration, we report a geochronological study with 25 SHRIMP zircon U-Pb ages from the Gangdese Batholith that represents the largest Trans-Himalayan plutonic complex. The results suggest two distinct stages of plutonism in the Late Cretaceous (ca. 103-80 Ma) and early Paleogene (ca. 65-46 Ma), respectively. Our new data confirm if not refine the notion that a Gangdese magmatic gap or quiescent period existed between ca. 80 and 70 Ma. It is furthermore identified that the early stage ended with adakitic intrusion and the latter stage is marked by a peak activity at ca. 50 Ma. We attribute the cessation of the early stage, and following magmatic gap, to a flattening of the northward Neotethyan subduction, and the initiation of the latter stage to rollback of the subducted slab. The proposed scenarios can also account for the southward migration and intensification of Cretaceous to Paleogene volcanism in the Lhasa terrane that demonstrates a coeval, eruptive "flare-up" event around 50 Ma, interpreted as the result of detaching the Neotethyan oceanic slab from the adherent, more buoyant Indian continental lithosphere owing to the India-Asia collision. Our model is, moreover, in general accord with sedimentary and structural geologic records from southern Tibet where subduction-related orogenesis appears to have evolved through time before India started colliding Asia.

Original languageEnglish
Pages (from-to)191-201
Number of pages11
JournalChemical Geology
Volume252
Issue number3-4
DOIs
Publication statusPublished - 2008 Jul 15

Fingerprint

batholith
zircon
subduction
Paleogene
terrane
slab
collision
Cretaceous
plutonism
continental lithosphere
orogeny
magmatism
volcanism
Asia

Keywords

  • Gangdese Batholith
  • Neotethyan subduction
  • Tibet
  • Zircon U-Pb dating

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

Cite this

Zircon SHRIMP U-Pb ages of the Gangdese Batholith and implications for Neotethyan subduction in southern Tibet. / Wen, Da Ren; Liu, Dunyi; Chung, Sun Lin; Chu, Mei Fei; Ji, Jianqing; Zhang, Qi; Song, Biao; Lee, Tung-Yi; Yeh, Meng-Wan; Lo, Ching Hua.

In: Chemical Geology, Vol. 252, No. 3-4, 15.07.2008, p. 191-201.

Research output: Contribution to journalArticle

Wen, Da Ren ; Liu, Dunyi ; Chung, Sun Lin ; Chu, Mei Fei ; Ji, Jianqing ; Zhang, Qi ; Song, Biao ; Lee, Tung-Yi ; Yeh, Meng-Wan ; Lo, Ching Hua. / Zircon SHRIMP U-Pb ages of the Gangdese Batholith and implications for Neotethyan subduction in southern Tibet. In: Chemical Geology. 2008 ; Vol. 252, No. 3-4. pp. 191-201.
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AU - Wen, Da Ren

AU - Liu, Dunyi

AU - Chung, Sun Lin

AU - Chu, Mei Fei

AU - Ji, Jianqing

AU - Zhang, Qi

AU - Song, Biao

AU - Lee, Tung-Yi

AU - Yeh, Meng-Wan

AU - Lo, Ching Hua

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AB - The Trans-Himalayan magmatism, which occurred extensively in the Lhasa terrane of southern Tibet, has long been related to the Neotethyan subduction before the India-Asia collision. To better delineate the magmatic duration, we report a geochronological study with 25 SHRIMP zircon U-Pb ages from the Gangdese Batholith that represents the largest Trans-Himalayan plutonic complex. The results suggest two distinct stages of plutonism in the Late Cretaceous (ca. 103-80 Ma) and early Paleogene (ca. 65-46 Ma), respectively. Our new data confirm if not refine the notion that a Gangdese magmatic gap or quiescent period existed between ca. 80 and 70 Ma. It is furthermore identified that the early stage ended with adakitic intrusion and the latter stage is marked by a peak activity at ca. 50 Ma. We attribute the cessation of the early stage, and following magmatic gap, to a flattening of the northward Neotethyan subduction, and the initiation of the latter stage to rollback of the subducted slab. The proposed scenarios can also account for the southward migration and intensification of Cretaceous to Paleogene volcanism in the Lhasa terrane that demonstrates a coeval, eruptive "flare-up" event around 50 Ma, interpreted as the result of detaching the Neotethyan oceanic slab from the adherent, more buoyant Indian continental lithosphere owing to the India-Asia collision. Our model is, moreover, in general accord with sedimentary and structural geologic records from southern Tibet where subduction-related orogenesis appears to have evolved through time before India started colliding Asia.

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