西藏雄梅铜矿区含矿斑岩与非含矿斑岩成因对比研究
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摘要
西藏雄梅铜矿床是近年来在班公湖_怒江成矿带中段新发现的一处斑岩铜矿床,该矿床的发现使得班公湖_怒江成矿带真正具备了"带"的概念,大大地拓宽了找矿远景。文章通过对雄梅铜矿区斑岩体的LA_ICP_MS锆石U_Pb定年,发现矿区存在2套斑岩:一套是前人测定的年龄为106.7 Ma的含矿斑岩;另一套是本文测定的非含矿斑岩,3个年龄分别是(121.8±2.3)Ma(MSWD=0.32)、(122.8±2.1)Ma(MSWD=1.16)、(121.5±2.5)Ma(MSWD=0.54)。两套斑岩的岩性虽然都是花岗闪长斑岩,但非含矿斑岩比含矿斑岩含有更多的钾长石,矿化强度大大减弱。岩石地球化学分析结果表明,两套斑岩虽然都富集大离子亲石元素(LILE)Rb、Ba、Th、U、K、Pb,亏损高场强元素(HFSE)Nb、Ta、Ti,具有碰撞后岩浆作用的共同特征,但在岩浆源区和成因上显示出明显的差异。含矿斑岩和非含矿斑岩均属于强过铝质S型花岗岩,然而前者源区组成为杂砂岩,后者源区则以泥质岩为主。岩浆分异过程中,含矿斑岩受斜长石和钾长石的分离结晶控制,非含矿斑岩则受钾长石和黑云母的分离结晶控制。
The Xiongmei copper deposit is a newly_discovered porphyry copper deposit which belongs to the middle segment of the Bangong Co_Nujiang metallogenic belt. The meaning of this deposit lies in that it breaks the limitation of prospecting,makes this metallogenic belt own the real meaning of ore belt,and vastly broadens the promising prospecting areas. The authors found two groups of porphyries by using LA_ICP_MS zircon U_Pb dating of porphyry body in the Xiongmei copper deposit. One group of porphyry is ore_bearing porphyry and its age is( 106. 7 ± 0. 48)Ma( MSWD = 0. 92; the other group of porphyry is barren porphyry with its three age parts being( 121. 8 ± 2. 3)Ma( MSWD = 0. 32),( 122. 8 ± 2. 1) Ma( MSWD = 1. 16),and( 121. 5 ± 2. 5) Ma( MSWD = 0. 54). Although the two groups of porphyries are all granodiorite_porphyry,the barren porphyries have more potassium feldspar and less intensity of mineralization than the ore_ bearing porphyries. The petrogeochemical analysis indicates that the two groups of porphyries are enriched in large ion lithophile elements( LILE) of Rb,Ba,Th,U,K,Pb and depleted in high field strength elements( HFSE) of Nb,Ta,Ti,and show essential characteristics of post_collisional magmatic rocks,but there are some obvious differences in magma sources and petrogenesis. Ore_bearing porphyry and barren porphyry all belong to strongly peraluminous S_type granitoids,but the sources of the ore_bearing porphyry are composed of greywacke and the sources of barren porphyry are based on argillaceous rock. In the magmatic differentiation process,ore_bearing porphyries are controlled by the fractional crystallization of plagioclase and potash feldspar,whereas the barren porphyries are controlled by the fractional crystallization of potash feldspar and biotite.
The Xiongmei copper deposit is a newly_discovered porphyry copper deposit which belongs to the middle segment of the Bangong Co_Nujiang metallogenic belt. The meaning of this deposit lies in that it breaks the limitation of prospecting,makes this metallogenic belt own the real meaning of ore belt,and vastly broadens the promising prospecting areas. The authors found two groups of porphyries by using LA_ICP_MS zircon U_Pb dating of porphyry body in the Xiongmei copper deposit. One group of porphyry is ore_bearing porphyry and its age is( 106. 7 ± 0. 48)Ma( MSWD = 0. 92; the other group of porphyry is barren porphyry with its three age parts being( 121. 8 ± 2. 3)Ma( MSWD = 0. 32),( 122. 8 ± 2. 1) Ma( MSWD = 1. 16),and( 121. 5 ± 2. 5) Ma( MSWD = 0. 54). Although the two groups of porphyries are all granodiorite_porphyry,the barren porphyries have more potassium feldspar and less intensity of mineralization than the ore_ bearing porphyries. The petrogeochemical analysis indicates that the two groups of porphyries are enriched in large ion lithophile elements( LILE) of Rb,Ba,Th,U,K,Pb and depleted in high field strength elements( HFSE) of Nb,Ta,Ti,and show essential characteristics of post_collisional magmatic rocks,but there are some obvious differences in magma sources and petrogenesis. Ore_bearing porphyry and barren porphyry all belong to strongly peraluminous S_type granitoids,but the sources of the ore_bearing porphyry are composed of greywacke and the sources of barren porphyry are based on argillaceous rock. In the magmatic differentiation process,ore_bearing porphyries are controlled by the fractional crystallization of plagioclase and potash feldspar,whereas the barren porphyries are controlled by the fractional crystallization of potash feldspar and biotite.
引文
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