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dc.contributor.authorLi, S.
dc.contributor.authorChung, S.
dc.contributor.authorWang, T.
dc.contributor.authorWilde, Simon
dc.contributor.authorChu, M.
dc.contributor.authorGuo, Q.
dc.date.accessioned2017-06-23T03:00:42Z
dc.date.available2017-06-23T03:00:42Z
dc.date.created2017-06-19T03:39:28Z
dc.date.issued2017
dc.identifier.citationLi, S. and Chung, S. and Wang, T. and Wilde, S. and Chu, M. and Guo, Q. 2017. Tectonic significance and geodynamic processes of large-scale Early Cretaceous granitoid magmatic events in the southern Great Xing'an Range, North China. Tectonics. 36 (4): pp. 615-633.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/53627
dc.identifier.doi10.1002/2016TC004422
dc.description.abstract

The origin and geodynamic evolution of peak Early Cretaceous magmatism in the southern Great Xing'an Range, North China, have long been controversial. Here we report new U-Pb zircon ages (141-129Ma) of a suite of dioritic-granitic rocks from central Inner Mongolia, far from the sutures or plate boundaries of the Paleo-Pacific and Mongol-Okhotsk oceans, thus delineating an Early Cretaceous intracontinental magmatic province, which had a peak activity at 130-120Ma. Dioritic suite including diorite, tonalite, and granodiorite shows variable zircon eHf(t) of +1.4 to+11.8 and d18O values of +5.7 to +6.9‰, while granitic suite consisting of monzogranite, syenogranite, and granite porphyry also records variable zircon eHf(t) of -0.9 to +15.0 and d18O values of +6.3 to +8.1‰, suggesting crustal melting by preexisting crustal source with important recycled supracrustal components including fluids. Furthermore, these rocks show variable whole-rock d7Li values (-0.6 to +12.1‰), indicating fluids played an important role in magma source. We propose a deep-sourced water-fluxed melting scenario by ancient hydrous slabs inherited from the Paleo-Asian Ocean that were trapped in the deep interior, thus releasing aqueous fluids to melt the lithospheric mantle and produce water-rich mafic magmas. These mafic magmas were underplated into crust where they promoted water-fluxed partial melting to generate the large-scale Early Cretaceous magmatism in the southern Great Xing'an Range. Such melting due to fluxing of aqueous fluids was probably operating as a widespread process responsible for the Early Cretaceous dramatically tectonomagmatic events and evolution of continental crust in NE Asia.

dc.publisherAmerican Geophysical Union
dc.titleTectonic significance and geodynamic processes of large-scale Early Cretaceous granitoid magmatic events in the southern Great Xing'an Range, North China
dc.typeJournal Article
dcterms.source.issn0278-7407
dcterms.source.titleTectonics
curtin.departmentDepartment of Applied Geology
curtin.accessStatusFulltext not available


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