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Basement‐Cover Sequences within the UHP unit of the Dabie Shan by R. Schmid; R. L. Romer; L. Franz; R. Oberhänsli; G. Martinotti is a Earth and Planetary Sciences article available to read on EtoBox.

What is Basement‐Cover Sequences within the UHP unit of the Dabie Shan about?

## Abstract Field data define two lithologically distinct basement‐cover sequences within the ultrahigh‐pressure metamorphic (UHPM) unit of the Dabie Shan, eastern China. One of the cover units, the Changpu unit, comprises calc‐arenitic metasediments in stratigraphic contact with a basement consisting of gneisses of the Yangtze craton. The second cover unit, the Ganghe unit, consists of felsic‐intermediate metavolcanics and clastic metasediments. Basement exposure of the Ganghe unit is not known. Fold axes in the Ganghe unit are oblique to those of the Changpu unit, which are parallel to those of the Yangtze gneisses. Preservation of primary textures in some volcanic rocks, and tectonic separation from the Yangtze gneisses by a greenschist facies mylonite, support an interpretation of the Ganghe unit as a low‐strain domain. Protolith associations in the Ganghe and Changpu units are compatible with deposition in a rift setting and along a passive continental margin, respectively. A U–Pb single zircon age of 761 ± 33 Ma for volcanoclastic rocks of the Ganghe unit demonstrates a Neoproterozoic deposition age, concordant with inferred rifting at that time. Eclogite facies parageneses i

Who reads Basement‐Cover Sequences within the UHP unit of the Dabie Shan?

Author

R. Schmid; R. L. Romer; L. Franz; R. Oberhänsli; G. Martinotti

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley; University of California Press (ISSN 0263-4929)

Published

2003

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)