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By Ben-Xun Su

The common mafic-ultramafic complexes within the Earth are famous as their webhosting Ni-Cu-PGE ore deposits, and their petrogenesis and mineralization became scorching matters within the geological stories. This thesis comprehensively investigated the petrology, mineralogy, geochemistry and geochronology of a number of mafic-ultramafic complexes within the Beishan Terrane, southern significant Asian Orogenic Belt aimed toward systematically choosing the mineralization and petrogenetic tactics answerable for the formation of the complexes and putting constraints at the tectonic evolution of the japanese Tianshan and Beishan, and the Early Permian mantle plume. The thesis pointed out mineralizing symptoms of Ni-Cu sulfide deposits and outlined the jobs of partial melting, fractional crystallization, crustal assimilation and magma injection. The systematical isotopic compositions published the mantle resource of the mafic-ultramafic complexes had gone through the subduction-related ameliorations either from the South Tianshan Ocean and as a consequence the Junggar Ocean, and that the complexes have been emplaced within the interval of 269-285 Ma coeval with the 280 Ma mantle plume occasion within the Tarim Craton. the result of this thesis offer new insights concerning the tectonic surroundings, magma evolution, ore genesis, and exploration implications of the mafic-ultramafic complexes in vital Asian Orogenic Belt. Dr. Benxun Su works on the Institute of Geology and Geophysics, chinese language Academy of Sciences, China.

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