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Earth Sciences & Geography - Geology | Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication

Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication

Series: Springer Theses

Su, Ben-Xun

2014, XIII, 211 p. 62 illus., 48 illus. in color.

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  • Contributes significantly to exploration of Ni-Cu-PGE deposits particularly those within organic belt
  • Constructs the tectonic evolutionary history of the southern CAOB involving the subduction of South Tianshan ocean and subsequent Junggar ocean
  • Proposes a mantle plume + post-orogenic extension model for the generation of mafic-ultramafic complexes in southern CAOB
The widespread mafic-ultramafic complexes in the Earth are well-known as their hosting Ni-Cu-PGE ore deposits, and their petrogenesis and mineralization have become hot issues in the geological studies. This thesis comprehensively investigated the petrology, mineralogy, geochemistry and geochronology of several mafic-ultramafic complexes in the Beishan Terrane, southern Central Asian Orogenic Belt aimed at systematically determining the mineralization and petrogenetic processes responsible for the formation of the complexes and placing constraints on the tectonic evolution of the Eastern Tianshan and Beishan, and the Early Permian mantle plume. The thesis identified mineralizing indicators of Ni-Cu sulfide deposits and defined the roles of partial melting, fractional crystallization, crustal assimilation and magma injection. The systematical isotopic compositions revealed the mantle source of the mafic-ultramafic complexes had undergone the subduction-related modifications both from the South Tianshan Ocean and subsequently the Junggar Ocean, and that the complexes were emplaced in the period of 269-285 Ma coeval with the 280 Ma mantle plume event in the Tarim Craton. The results of this thesis provide new insights about the tectonic setting, magma evolution, ore genesis, and exploration implications of the mafic-ultramafic complexes in Central Asian Orogenic Belt. Dr. Benxun Su works at the Institute of Geology and Geophysics, Chinese Academy of Sciences, China.

Content Level » Research

Keywords » Beishan - Central Asian Orogenic Belt - Mafic-ultramafic Complex - Magmatic Ni-Cu-PGE Sulfide Mineralization - Mantle Plume

Related subjects » Geochemistry - Geology

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