| 西藏雄梅-班戈花岗岩带岩石地球化学与成矿作用 |
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| 引用本文： | 耿全如,张璋,彭智敏,关俊雷,丛峰.西藏雄梅-班戈花岗岩带岩石地球化学与成矿作用[J].地球科学,2020,45(8):2805-2825. |
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| 作者姓名： | 耿全如 张璋 彭智敏 关俊雷 丛峰 |
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| 作者单位： | 中国地质调查局成都地质调查中心, 四川成都 610081 |
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| 基金项目： | 中国地质调查局项目DD20190363中国地质调查局项目12120113036500国家自然科学基金项目41273047 |
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| 摘 要： | 西藏中部的雄梅-班戈-青龙乡-桑雄一带发育一条连续的花岗岩带，属于班公湖-怒江成矿带的中段.该带在近年来已发现雄梅铜矿、苦嘎铜矿、日阿铜矿和青龙乡铅锌矿等中小型矿床和矿点，但仍未有更大的找矿突破.根据全面的资料收集和野外调查，对花岗岩体的地球化学性质、物质来源和成矿地质条件进行了研究.该带花岗岩主要可分为140~125 Ma、120~110 Ma、94~72 Ma三个侵入期次以及一些新生代岩体，其中120~110 Ma为岩浆活动大爆发阶段.本区西段的早白垩世的舍索、雄梅、苦嘎花岗岩体和晚白垩世的雪如、桑心日等岩体已发现显著的铜金铁等矿化，但它们的成岩成矿物质来源和围岩性质等方面与超大型斑岩铜矿有差距，可形成类似于青草山铜矿的中-大型斑岩铜金矿床或矽卡岩型矿床，有进一步找矿的潜力.沿班戈-青龙乡-桑雄连续分布的早白垩世花岗岩带与热液型、矽卡岩型铁铅锌多金属成矿作用关系密切.
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| 关 键 词： | 雄梅-班戈 花岗岩带 岩石地球化学 成矿作用 地质年代学 |
| 收稿时间： | 2020-06-17 |
Petrogeochemistry and Metallogenesis Related to Xiongmei-Baingoin Granitic Zone in Central Tibet |
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| Abstract: | The continuous Xiongmei-Baingoin-Qinglong-Sangxiong granite zone, located in central Tibet, belongs to the middle part of the Bangong-Nujiang metallogenic belt. Small- and medium-sized deposits were discovered in recent years, such as Xiongmei, Kuga, Ri'a copper deposits and Qinglong lead-zinc deposit, but no bigger deposits were found in this zone. Based on comprehensive data collection and field investigation, research on geochemical properties, magma sources and ore-forming factors of the granitic zone was carried out. The granitic intrusive stages can be identified at 140-125 Ma, 120-110 Ma, 94-72 Ma, and some Cenozoic intrusions, with a magmatic flare-up at 120-110 Ma. In western part of this area, the Early Cretaceous Shesuo, Xiongmei, Kuga granitic intrusives and the Late Cretaceous Xueru, and Sangxinri granitic intrusives are significant ore-forming granites with copper, gold and iron deposits. However, they are different from granitic intrusives forming super-large porphyry copper deposits regarding to their magma sources and surrounding rock. They have prospecting potential to form medium- or large-sized porphyry copper, gold deposits or skarn-type deposits similar to the Qingcaoshan copper deposit. The Early Cretaceous granites distributed continuously along Baingoin, Qinglong and Sangxiong are closely related to hydrothermal and skarn-type iron, lead and zinc polymetallic mineralization. |
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