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玉龙斑岩铜矿带扎拉尕斑岩铜钼矿床位于玉龙斑岩铜矿带中北部,赋矿岩体侵入下二叠统火山岩及三叠系砂泥岩中,主要由早阶段为二长花岗斑岩及晚阶段正长花岗斑岩组成。分析了早阶段二长花岗斑岩及晚阶段正长花岗斑岩锆石LA-ICP-MS U-Pb年龄。早阶段二长花岗斑岩该年龄为(38.5±0.2)Ma,MSWD=1.12,晚阶段正长花岗斑岩该年龄为(38.5±0.2)Ma,MSWD=1.08,早阶段和晚阶段含矿斑岩体锆石U-Pb年龄完全一致。这表明早晚两阶段成矿岩体是在很短的时间间隔内形成的。扎拉尕赋矿斑岩体形成年龄为(38.5±0.2)Ma。据扎拉尕斑岩矿床形成时代及藏东地区在始新世至渐新世地质构造背景,提出扎拉尕斑岩矿床和玉龙斑岩铜矿带的形成与印度板块-欧亚板块碰撞在藏东地区形成的走滑构造活动诱发的岩浆活动有关,为陆陆碰撞走滑构造环境的斑岩矿床。
The Yulong porphyry copper belt The Zalaga porphyry copper-molybdenum deposit is located in the north-central part of the Yulong porphyry copper belt. The ore-hosting rocks intrude into the Lower Permian volcanic rocks and Triassic sandstone and mudstone mainly from the early stage Granite porphyry and the late stage is the granite porphyry composition. The zircon LA-ICP-MS U-Pb ages of the early stage monzogranite porphyry and later stage Zhengzhang granite porphyry were analyzed. The age of early granodiorite porphyry was (38.5 ± 0.2) Ma, MSWD = 1.12. The late-stage granodiorite was 38.5 ± 0.2 Ma in age and MSWD was 1.08. The early and late stages The zircon U-Pb ages of the ore-bearing porphyry bodies are exactly the same. This indicates that the early and late two-stage ore-forming bodies were formed within a short period of time. The age of formation of Zalagavu porphyry body is (38.5 ± 0.2) Ma. According to the formation age of Zalagai porphyry deposit and the geological structure from Eocene to Oligocene in eastern Tibet, it is proposed that the Zalaga porphyry deposit and the Yulong porphyry copper belt collide with the Indian plate-Eurasian plate Related to the magmatic activity induced by the strike slip tectonics formed in the eastern Tibet, it is a porphyry deposit with continental-continental collision strike-slip tectonic environment.