| 班公湖-怒江带、羌塘地块特提斯演化
与成矿地质背景 |
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| 引用本文： | 耿全如,潘桂棠,王立全,彭智敏,张 璋.班公湖-怒江带、羌塘地块特提斯演化
与成矿地质背景[J].地质通报,2003,22(1):1261-1274. |
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| 作者姓名： | 耿全如 潘桂棠 王立全 彭智敏 张 璋 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 中国地质调查局,北京,100035 |
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| 基金项目： | 地矿部跨世纪人才基金项目，同位素开放实验室基金项目(B9804) |
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| 摘 要： | 孟家屯岩组是山东省地矿局第九地质队张连峰等人１９９２年进行１∶５００００新汶、放城幅区调时，在新泰市孟家屯一带发现的一套石英岩组合的表壳岩，并将其划归为泰山岩群的底部［１］。前人认为孟家屯岩组总体上发生了３期变质作用?：第一期区域变质作用，使孟家屯岩组泥质岩中出现了斜长石、蓝晶石、铁铝榴石，基性岩中出现斜长石、普通角闪石等新生矿物，变质作用达中级变质，岩石的形成温度为T＝５３０～６３０℃，压力p＝０．５８～０．７２GPa，属中压相系中的低角闪岩相；第二期区域变质作用为泰山岩群地层发生的退变质作用，形…
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| 关 键 词： | 孟家屯岩组 红柱石 锌尖晶石 山东 表壳岩 变质作用 |
| 文章编号： | 1671-2552(2003)01-0065-02 |
| 修稿时间： | 8/9/2002 12:00:00 AM |
Tethyan evolution and metallogenic geological background of the Bangong Co-Nujiang belt and the Qiangtang massif in Tibet |
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| GENG Quan-ru,PAN Gui-tang,WANG Li-quan,PENG Zhi-min,ZHANG Zhang.Tethyan evolution and metallogenic geological background of the Bangong Co-Nujiang belt and the Qiangtang massif in Tibet[J].Geologcal Bulletin OF China,2003,22(1):1261-1274. |
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| Authors: | GENG Quan-ru PAN Gui-tang WANG Li-quan PENG Zhi-min ZHANG Zhang |
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| Institution: | Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China |
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| Abstract: | Early Paleozoic-Devonian sediments of the study area are mainly composed of shelf clastic rocks and platform carbonate, representing the northern margin of Gondwana and south Tethyan passive continental margin. Permian-Carboniferous archipelagos were formed to the south and north of the Tethyan ocean, resulting in the formation of magmatic arcs to the north of the Longmuco-Shuanghu belt and the south of the Jinshajiang and in the Gangdise zone one after another. Mesozoic archipelagos occurred to the south of the Tethyan ocean, where Cr, Ni and Pt group metallic type deposits of magmatic segregation occurred in the SSZ-type ophiolite. Petrological and geophysical evidence supports a bilateral subduction scenario that resulted in arc magmatism to the north and south of the Bangong Co-Nujiang suture zone. These magmatic arcs are the most important metallogenic belt for porphyry copper deposits, skarn-type magnetite deposits and hydrothermal polymetallic deposits. The Jurassic back arc and foreland basin to the northeastern Qiangtang favored the formation of depositional and hydrothermal alteration Fe-Cu-Sb-Au deposits. In the collisional stage of Late Cretaceous-Cenozoic period, hydrothermal deposits were widely distributed, and this stage was also a stage with the potential to form porphyry copper deposits. |
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| Keywords: | Qiangtang massif Bangong Co-Nujiang suture zone Tethyan evolution metallogenesis |
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