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西南三江北段是青海省重要的斑岩型铜钼矿成矿带,纳日贡玛铜钼矿是近年来在三江北段发现的与侵入岩有关的斑岩型铜钼矿。利用锆石U-Pb方法测得纳日贡玛黑云花岗斑岩的形成年龄为41.53Ma±0.24Ma,属于喜马拉雅早期。纳日贡玛斑岩型铜钼矿的成矿时代主要在40.86~40.80Ma之间。在多期热液叠加、多期成矿作用中,纳日贡玛斑岩型铜钼矿的热液应是纳日贡玛黑云花岗斑岩(41.53Ma±0.24Ma)和纳日贡玛斜长花岗斑岩(41.00Ma±0.18Ma)共同提供的。由于该区有较多的中酸性岩体存在,因而确定这些侵入体的形成年龄,对于在该区寻找同时代的斑岩型铜钼矿有重要的理论意义和现实意义。
The northwestern part of Sanjiang in the southwestern part is an important porphyry copper-molybdenum ore deposit in Qinghai Province. The Najigongma copper-molybdenum deposit is a porphyry type copper-molybdenum ore related to intrusive rocks discovered in the northern part of Sanjiang in recent years. The age of formation of the Najgamme biotite granite porphyry was 41.53Ma ± 0.24Ma measured by zircon U-Pb method, belonging to the early Himalayas. The mineralization age of the Najigon porphyry Cu-Mo deposit is mainly between 40.86 and 40.80Ma. In the multi-stage hydrothermal superposition and multi-stage mineralization, the hydrothermal fluids of the Nagi Gomma porphyry copper-molybdenum deposit should be nautical magma porphyry (41.53Ma ± 0.24Ma) Ma plagioclase granite porphyry (41.00Ma ± 0.18Ma) jointly provided. Because of the presence of more acidic rocks in the area, determining the age of formation of these intrusions is of great theoretical and practical significance for finding contemporaneous porphyry Cu and Mo deposits in this area.