NDLI: U-Pb isotopic geochemistry of the post-collisional mafic-ultramafic rocks from the Dabie Mountains : Crust-mantle interaction and LOMU component

Content Provider	Springer Nature Link
Author	Huang, Fang LI, Shuguang Zhou, Hongying LI, Huimin
Copyright Year	2003
Abstract	The U-Pb isotope geochemical study of the pyroxenite-gabbro intrusion in the Dabie Mountains shows that the post-collisional mafic-ultramafic rocks of the Dabie Mountains are characterized by relative high Pb contents, low U contents and low U/Pb ratios. These characters may be results of interaction between lithosphere or depleted asthenospheric mantle (DMM) and lower crust, but have nothing to do with mantle plume and subducted continental crust. It was first observed that some samples with lower $^{206}$Pb/$^{204}$Pb and higher $^{207}$Pb/$^{204}$Pb ratios show typical characters of the LOMU component. The Pb, Sr, and Nd isotopic tracing shows that three components are needed in the source of the Zhujiapu pyroxenite-gabbro intrusion. They could be old enriched sub-continental lithospheric mantle (LOMU component), lower crust and depleted asthenospheric mantle. The crust-mantle interaction process producing primitive magma of post-collisional mafic-ultramafic rocks in the Dabie Mountains could be described by a lithospheric delamination and magma underplating model. After continent-continent collision, delamination of the thickened lithosphere induced the upwelling of depleted asthenospheric mantle, which caused partial melting of asthenospheric mantle and residual sub-continental lithospheric mantle. The basaltic magma produced in this process underplated in the boundary between the crust and mantle and interacted with lower crust resulting in the geochemical characters of both enriched lithospheric mantle and lower crust.
Starting Page	320
Ending Page	332
Page Count	13
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	46
Issue Number	4
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2003-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	mafic-ultramafic rocks crust-mantle interaction U-Pb isotopic geochemistry Dabie Mountains LOMU component Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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