History of subduction erosion and accretion recorded in the Yarlung Suture zone, Southern Tibet

Kathryn Metcalf, Paul Kapp

Research output: Chapter in Book/Report/Conference proceedingChapter

7 Scopus citations

Abstract

The history of pre-Cretaceous subduction accretion and erosion along the Yarlung Suture Zone remains poorly constrained. We present new geological mapping along c. 200 km of the suture zone, 4881 detrital zircon U–Pb ages, and sandstone petrography for the subduction complex and Tethyan Himalayan strata. We provide the first documentation of the c. 158 Ma marine Xiazha Formation, which contains volcanic clasts of intermediate to felsic volcanic rocks and ooids with both calcareous and volcanic cores. Based on our new data and synthesis of published data, we present a model in which the Zedong arc represents the southwards migration of the Gangdese arc onto a forearc ophiolite that was generated proximal to the southern Asian margin during Neo-tethyan slab rollback at 160–150 Ma. This contrasts with previous suggestions that the Zedong arc, Yarlung ophiolites and subduction complex rocks developed above an intra-oceanic subduction zone thousands of kilometres south of Asia. Although Gangdese arc magmatism began in the Middle Triassic, the only forearc units preserved are 160 Ma until collision between the Xigaze forearc basin and Tethyan Himalaya at c. 59 Ma. This suggests that almost all pre-Cretaceous forearc assemblages have been removed by subduction erosion at the trench.

Original languageEnglish (US)
Title of host publicationGeological Society Special Publication
PublisherGeological Society of London
Pages517-554
Number of pages38
Edition1
DOIs
StatePublished - Jan 1 2019

Publication series

NameGeological Society Special Publication
Number1
Volume483
ISSN (Print)0305-8719

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Geology

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    Metcalf, K., & Kapp, P. (2019). History of subduction erosion and accretion recorded in the Yarlung Suture zone, Southern Tibet. In Geological Society Special Publication (1 ed., pp. 517-554). (Geological Society Special Publication; Vol. 483, No. 1). Geological Society of London. https://doi.org/10.1144/SP483.12