Beschreibung
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.
Autorenporträt
2010 Prize of President Scholarship for Postgraduate Students 2010 Lisiguang Award for Excellent Ph.D student 2010 GUCASBHP Billiton Scholarship 2012 Outstanding Doctoral Dissertation Awards, Chinese Academy of Sciences, China 2012 Outstanding Ph.D Thesis, Beijing 2012 Xiangjiang Scholar, University of Hong KongPublications: 25 Su, B.X., Qin, K.Z., Santosh, M., Sun, H., Tang, D.M., 2013. The Early Permian mafic-ultramafic complexes in the Beishan Terrane, NW China: Alaskan-type intrusives or rift cumulates? Journal of Asian Earth Sciences 66(4), 175-187. 24 Su, B.X., Qin, K.Z., Tang, D.M., Sakyi, P.A., Liu, P.P., Sun, H., Xiao, Q.H., 2013. Late Paleozoic mafic-ultramafic intrusions in southern Central Asian Orogenic Belt (NW China): insight into magmatic Ni-Cu sulfide mineralization in orogenic setting. Ore Geology Reviews 51(2), 57-73. 23 Su, B.X., Zhang, H.F., Ying, J.F., Tang, Y.J., Hu, Y., Santosh, M., 2012. Metasomatized lithospheric mantle beneath Western Qinling, central China: insight into activity of carbonatite melts. The Journal of Geology 120(6), 671-681. 22 Su, B.X., Zhang, H.F., Hu, Y., Santosh, M., Tang, Y.J., Xiao, Y., 2012. The genesis of mantle-derived sapphirine. American Mineralogist 97(5-6), 856-863. 21 Su, B.X., Zhang, H.F., Yang, Y.H., Sakyi, P.A., Ying, J.F., Tang, Y.J., 2012. Breakdown of orthopyroxene contributing to melt pockets in mantle peridotite xenoliths from the Western Qinling, central China: constraints from in situ LA-ICP-MS mineral analyses. Mineralogy and Petrology 104(3), 225-247. 20 Su, B.X., Qin, K.Z., Sun, H., Tang, D.M., Sakyi, P.A., Chu, Z.Y., Liu, P.P., Xiao, Q.H., 2012. Subduction-induced mantle heterogeneity beneath Eastern Tianshan and Beishan: insights from Nd-Sr-Hf-O isotopic mapping of Late Paleozoic mafic-ultramafic complexes. Lithos 134-135(3), 41-51. 19 Su, B.X., Qin, K.Z., Sun, H., Tang, D.M., Xiao, Q.H., Liu, P.P., Sakyi, P.A., 2012. Olivine compositional mapping of mafic-ultramafic complexes in Eastern Xinjiang (NW China): Implications for mineralization and tectonic dynamics. Journal of Earth Science 23(1), 41-53. 18 Su, B.X., Zhang, H.F., Deloule, E., Sakyi, P.A., Xiao, Y., Tang, Y.J., Hu, Y., Ying, J.F., Liu, P.P., 2012. Extremely high Li and low d7Li signatures in the lithospheric mantle. Chemical Geology 292-293, 149-157. 17 Su, B.X., Qin, K.Z., Sakyi, P.A., Malaviarachchi, S.P.K., Liu, P.P., Tang, D.M., Xiao, Q.H., Sun, H., Ma, Y.G., Mao, Q., 2012. Occurrence of an Alaskan-type complex in the Middle Tianshan Massif, Central Asian Orogenic Belt: Inferences from petrological and mineralogical studies. International Geology Review 54(3), 249-269. 16 Su, B.X., Qin, K.Z., Sakyi, P.A., Tang, D.M., Liu, P.P., Malaviarachchi, S.P.K., Xiao, Q.H., Sun, H., 2012. Geochronologic-petrochemical studies of the Hongshishan mafic-ultramafic intrusion, Beishan area, Xinjiang (NW China): petrogenesis and tectonic implications. International Geology Review 54(3), 270-289. 15 Su, B.X., Qin, K.Z., Tang, D.M., Deng, G., Xiao, Q.H., Sun, H., Lu, H.F., Dai, Y.C., 2011. Petrological features and implications for mineralization of the Poshi mafic-ultramafic intrusion in Beishan area, Xinjiang. Acta Petrologica Sinica 27(12), 3627-3639. 14 Su, B.X., Qin, K.Z., Sakyi, P.A., Li, X.H., Yang, Y.H., Sun, H., Tang, D.M., Liu, P.P., Xiao, Q.H., Malaviarachchi, S.P.K., 2011. U-Pb ages and Hf-O isotopes of zircons from Late Paleozoic mafic-ultramafic units in southern Central Asian Orogenic Belt: tectonic implications and evidence for an Early-Permian mantle plume. Gondwana Research 20(2-3), 516-531. 13 Su, B.X., Qin, K.Z., Sakyi, P.A., Liu, P.P., Tang, D.M., Malaviarachchi, S.P.K., Xiao, Q.H., Sun, H., Dai, Y.C., Hu, Y., 2011. Geochemistry and geochronology of acidic rocks in the Beishan region, NW China: petrogenesis and tectonic implications. Journal of Asian Earth Sciences 41(1), 31-43. 12 Su, B.X., Zhang, H.F., Sakyi, P.A., Yang, Y.H., Ying, J.F.,
