TY - JOUR A1 - Han,C. A1 - Xiao,W. A1 - Zhao,G. A1 - Su,B-X A1 - Sakyi,P.A. A1 - Ao,S. A1 - Wan,B. A1 - Zhang,J. A1 - Zhang,Z. T1 - SIMS U-Pb zircon dating and Re-Os isotopic analysis of the Hulu Cu-Ni deposit, eastern Tianshan, Central Asian Orogenic Belt, and its geological significance JF - Journal of Geosciences JA - J. Geosci. Y1 - 2013 VL - 58 IS - 3 SP - 251 EP - 270 CY - Prague PB - Czech Geological Society SN - 1803-1943 (online), 1802-6222 (print) AV - Free UR - http://dx.doi.org/10.3190/jgeosci.146 L1 - http://www.jgeosci.org/content/jgeosci.146_han.pdf KW - Hulu Complex KW - SIMS U-Pb zircon KW - Re-Os isotopic data KW - Cu-Ni deposit KW - Eastern Tianshan KW - Central Asian Orogenic Belt AB - Exploration of the Hulu Cu-Ni-Co sulfide deposit in Eastern Tianshan, Central Asian Orogenic Belt, has detected horizons of sulfide mineralization in pyroxenite and peridotite units. SIMS U-Pb zircon ages of the gabbro-hosting Cu-Ni-Co sulfide deposit indicate that the Hulu intrusion was emplaced at 282.3 ± 1.2 Ma (95% confidence level, MSWD = 3.30, n = 13). Osmium isotopic data suggest that the Hulu intrusion and associated Cu-Ni mineralization were derived from crustally-contaminated mantle melts. The intrusions clearly show island-arc geochemical signatures, such as negative Nb, Ta, Zr and Ti anomalies and enrichment in LILE. These geochemical tracers indicate that the Hulu mafic-ultramafic intrusions, along with the Cu-Ni deposit, formed as a result of subduction of oceanic crust in the Early Permian. The arc-related geodynamic setting of the Hulu Cu-Ni deposit is unusual for magmatic sulfide deposits. This new type of ore deposit offers an alternative perspective for Cu and Ni exploration. ER -