Age and composition of the Rushan intrusive complex in the northern Sulu orogen, eastern China: Petrogenesis and lithospheric mantle evolution

Hua Yun Tang, Jian Ping Zheng*, Chun Mei Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Zircon U-Pb age, whole-rock elemental and Sr-Nd isotopic data are presented for the Rushan intrusive complex from the northern Sulu orogen, China. The intrusion, emplaced at c. 111 Ma, consists mainly of biotite-bearing gabbro and pyroxene-bearing diorite. The rocks are high-K calc-alkaline in major elements, and enriched in large ion lithophile elements (LILE) and light rare earth elements (LREE), depleted in high field strength elements (HFSE), and possess narrow ranges of initial 87Sr/86Sr (0.70746-0.70827) and εNd(t) (-12.37 to -8.26). The complex is interpreted to originate from decompression melting of spinel-facies cratonic mantle that was metasomatized by the subducted Yangtze crustal materials and the melts experienced fractionation of olivine, clinopyroxene, apatite and Fe-Ti oxides. The Rushan complex is similar in composition to other Early Cretaceous mafic-intermediate complexes from the southern margin of the North China Craton, such as the Fangcheng basalts and Yinan gabbros, implying the mantle source of the Rushan intrusion is tectonically affiliated to the southern wedge of the Craton. We infer that the Rushan complex formed in an extensional regime corresponding to the asthenosphere upwelling during gradual erosion and replacement of the cratonic mantle by the fertile lithosphere beneath the eastern North China Craton.

Original languageEnglish
Pages (from-to)199-215
Number of pages17
JournalGeological Magazine
Volume146
Issue number2
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Gabbro-diorite
  • Geochemistry
  • Northern Sulu orogen
  • Petrogenesis
  • Zircon U-Pb ages

Fingerprint

Dive into the research topics of 'Age and composition of the Rushan intrusive complex in the northern Sulu orogen, eastern China: Petrogenesis and lithospheric mantle evolution'. Together they form a unique fingerprint.

Cite this