Coherence of the Dabie Shan UHPM terrane investigated by Lu-Hf and 40Ar/39Ar dating of eclogites

Fraukje M Brouwer, Mirek Groen, Oliver Nebel, Jan R Wijbrans, Huaning Qiu, Qijun Yang, Linghao Zhao, Yuanbao Wu

Research output: Chapter in Book/Report/Conference proceedingChapter (Book)Researchpeer-review

10 Citations (Scopus)

Abstract

The Central China Orogenic Belt (CCOB) is the largest known ultrahigh-pressure metamorphic (UHPM) belt. It extends from Sulu in Eastern China, via the Dabie, Qinling, and North Qaidam mountains to Altyn Tagh some 3000 km to the west. Since the discovery of coesite and diamond-bearing metamorphic rocks in Dabie Shan, the belt has been studied intensively. Some of the results have led to controversy regarding the number of (U)HP metamorphic events and their absolute and relative ages. The prominence of Dabie Shan as part of the largest UHPM belt is reflected by a wealth of published work since the discovery of coesite over 20 years ago. Despite two decades of efforts to decipher its geologic secrets, interpretation of the many reported isotopic ages of the Dabie Shan terrane that aimed to address its metamorphic history is still hampered by the absence of robust thermobarometric data for the same samples. Pre-Triassic metamorphism cannot be traced by Lu-Hf Grt-Cpx geochronology in the main volume of Dabie Shan, which was subjected to Triassic (U)HP metamorphism. The Triassic event erased previous signatures of some, but not all isotopic systems, as is evident from zircon U-Pb ages.
Original languageEnglish
Title of host publicationUltrahigh-Pressure Metamorphism: 25 Years After the Discovery of Coesite and Diamond
EditorsLarissa F Dobrzhinetskaya, Shah Wali Faryad, Simon Wallis, Simon Cuthbert
Place of PublicationLondon UK
PublisherElsevier
Pages325 - 357
Number of pages33
Edition1
ISBN (Print)9780123851444
DOIs
Publication statusPublished - 2011
Externally publishedYes

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