Petrology of the Hegenshan ophiolite and its implication for the tectonic evolution of northern China

Toshio Nozaka, Yan Liu

Research output: Contribution to journalArticlepeer-review

139 Citations (Scopus)

Abstract

Petrographic observations, and mineralogical and geochemical analyses, have revealed that the Hegenshan ophiolite is of mid-ocean ridge origin and has been subjected to dynamothermal metamorphism at medium P/T conditions. The metamorphism is characterized by a prograde change in paragenesis from the greenschist to epidote-amphibolite facies, with peak temperature conditions of 570-640°C at pressures of 4-10 kbar. The amphiboles formed by this metamorphism show K-Ar ages of 110-130 Ma. The metamorphic conditions and K-Ar ages suggest that the Hegenshan ophiolite is located at the suture between the Siberian and North China continental blocks, where the continental collision in this area took place in middle Mesozoic time. Given the temporal and spatial distribution of the igneous activity around the Da Hinggan Ling Mountains, it is suggested that the extensive Yanshanian magmatism in this region resulted predominantly from a southward subduction of an oceanic plate prior to collision. Alternatively, it may possibly have resulted from the collision itself, at the final stage.

Original languageEnglish
Pages (from-to)89-104
Number of pages16
JournalEarth and Planetary Science Letters
Volume202
Issue number1
DOIs
Publication statusPublished - Aug 30 2002

Keywords

  • Da Hinggan Ling
  • Inner Mongolia China
  • Metamorphism
  • Ophiolite
  • Plate collision

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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