Geological features and tectonic setting of porphyry copper deposits rounding the Balkhash region, Central Kazakhstan, Central Asia
Geological features and tectonic setting of porphyry copper deposits rounding the Balkhash region, Central Kazakhstan, Central Asia
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发表时间：
2008
影响因子：
1.8
通讯作者：
Guangming Li;Qin Kz;Li Jx
中科院分区：
文献类型：
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作者：
Guangming Li;Qin Kz;Li Jx
哈萨克斯坦中部地区位于中亚造山带的中心，是我国最大的斑岩型铜存款成矿域之一，分布着数十个大型、超大型矿床，其中斑岩型铜矿床主要有三种类型：斑岩型铜金矿、斑岩型铜矿床和斑岩型铜钼矿床，大多与同生火山岩有关。已建立的蚀变分带由碱性和酸性蚀变组成。斑状铜矿中硫化物的δ~（34）S（CDT）值范围为-铅同位素分析表明，成矿物质来源于下地壳和上地幔，哈萨克斯坦中部多期构造演化伴随着多期斑岩铜矿的形成，早古生代斑岩铜矿形成于岛弧演化的早期阶段，成矿物质来源于下地壳和上地幔。晚古生代斑岩铜矿局限于泥盆纪火山-深圳湾带，石炭-二叠纪火山-深圳湾带，自西北向东南向哈萨克斯坦中部，斑岩铜矿成矿时代不断年轻化，但对该地区斑岩铜矿的研究已有数十年，一些关键问题仍不确定，如主要斑岩铜矿侵入岩和成矿作用的高精度定年，准噶尔斑岩铜矿带与邻近的西准噶尔、西天山斑岩铜矿带的联系和综合对比，对进一步找矿具有重要意义。
Central Kazakhstan located in the center of the Central Asia Orogenic Belt(CAOB),is one of the largest porphyry copper deposit metallogenic domains,wherein hosts tens of large and superlm'ge ore deposits.In the area,three major subtypes of porphyry copper deposits have been recognized:porphyry Cu-Au deposits,porphyry Cu deposits and porphyry Cu-Mo deposits,mostly associated with contemporaneous volcanic rocks.Established alteration zonation consists of alkaline and acidic alterations.δ~(34)S(CDT) values of sulfides from porphyry copper deposits range from-7.1% to 4.2%,showing a deep source.Pb isotope analyses reveal that ore-forming materials were generated from lower crust and upper mantle.In the central Kazakhstan multistage tectonic evolutions were followed by formation of multistage porphyry copper deposits.Early Paleozoic porphyry copper deposits have been formed during early stages of island arcs evolution,but late Paleozoic porphyry copper deposits are confined in the Devonian volcano-plutonic belts,and then Carboniferous-Permian volcano-plutonic belts.From northwest to southeast towards the central Kazakhstan,ore-forming ages of porphyry copper deposits are successively younger.Whereas study on porphyry copper deposits in the region throughout tens years, some key problems yet remain uncertain,e.g.high-precise age-dating on intrusive stocks and mineralizations for the major porphyry copper deposits,temparol-spatial distribution framwork and geodynamic settings.The linkage and comprehensive correlation between Balkhash porphyry copper belt and adjacent Chinese western Jungar and western Tienshan is of great significance for further exploration.