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| 东天山大南湖岛弧带石炭纪岩石地层与构造演化 | |
| 引用本文： | 张洪瑞,魏刚锋,李永军,杜志刚,柴德亮.东天山大南湖岛弧带石炭纪岩石地层与构造演化[J].岩石矿物学杂志,2010,29(1):1-14. |
| 作者姓名： | 张洪瑞 魏刚锋 李永军 杜志刚 柴德亮 |
| 作者单位： | 1. 中国地质科学院,地质研究所,北京,100037;长安大学,地球科学与国土资源学院,陕西,西安,710054 2. 长安大学,地球科学与国土资源学院,陕西,西安,710054 3. 新疆维吾尔自治区地质矿产勘查开发局,第九地质大队,新疆,乌鲁木齐,830000 4. 长安大学,地球科学与国土资源学院,陕西,西安,710054;宁夏矿产地质调查所,宁夏,银川,750021 |
| 摘 要： | 详细的地质解剖工作表明,东天山地区大南湖岛弧带石炭纪出露4套岩石地层组合,即早石炭世小热泉子组火山岩、晚石炭世底坎儿组碎屑岩和碳酸盐岩、晚石炭世企鹅山组火山岩、晚石炭世脐山组碎屑岩夹碳酸盐岩。根据其岩石组合、岩石地球化学、生物化石、同位素资料以及彼此的产出关系,认为这4套岩石地层组合的沉积环境分别为岛弧、残余海盆、岛弧和弧后盆地。结合区域资料重塑了大南湖岛弧带晚古生代的构造格架及演化模式。早、晚石炭世的4套岩石地层组合并置体现了东天山的复杂增生过程。 |
| 关 键 词： | 石炭纪 岩石组合 构造演化 大南湖岛弧带 东天山 |
Carboniferous lithologic association and tectonic evolution of Dananhu arc in the East Tianshan Mountains |
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| ZHANG Hong_rui,WEI Gang_feng,LI Yong_jun,DU Zhi_gang and CHAI De_liang.Carboniferous lithologic association and tectonic evolution of Dananhu arc in the East Tianshan Mountains[J].Acta Petrologica Et Mineralogica,2010,29(1):1-14. | |
| Authors: | ZHANG Hong_rui WEI Gang_feng LI Yong_jun DU Zhi_gang and CHAI De_liang |
| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Earth Science & Land Resources College of Chang''an University, Xi''an 710054, China;Earth Science & Land Resources College of Chang''an University, Xi''an 710054, China;Earth Science & Land Resources College of Chang''an University, Xi''an 710054, China;No. 9 Geological Party, BGMERD of Xinjiang, Urumqi 830000, China;Earth Science & Land Resources College of Chang''an University, Xi''an 710054, China;Ningxia Institute of Geology and Mineral Research, Yinchuan 750021, China |
| Abstract: | Located in the southern margin of Tuha basin within the East Tianshan Mountains, Dananhu arc is famous for hosting Tuwu porphyry Cu deposits. It is important for us to deepen our understanding of the genesis of porphyry deposits and the tectonic evolution in the whole East Tianshan area. Based on detailed geological mapping, the authors recognized four lithostratigraphic associations in the Carboniferous Dananhu arc belt within the East Tianshan Mountains, i.e., the Lower Carboniferous Xiaorequanzi Formation consisting mainly of volcanic rocks, the Upper Carboniferous Dikan'er Formation composed of clastic rocks intercalated with carbonate, the Upper Carboniferous Qi'eshan Formation comprising volcanic rocks, and the Upper Carboniferous Qishan Formation of clastic and carbonate rocks. Their rock associations, geochemistry, fossils and spatial relationship together with previously published geochronological data suggest that the previously-thought Dananhu arc is actually made of arc volcanic rocks, back-arc basin sediments and remnant oceanic basin sediments, which are associated with the above-mentioned four units respectively. Thus, the tectonic and evolution framework has been established in association with regional studies. There existed at least two ocean-continent transformation stages (i.e., Late Devonian and Late Carboniferous) in the East Tianshan Mountains in Late Paleozoic. The marine deposit of Early Carboniferous Xiaorequanzi volcanic rocks was formed by ocean-ocean subduction in the Kangur Ocean far away from the Devonian active continental margin. The collision between marine volcanic rocks and the Tarim active continental margin (central Tianshan block) formed the Late Carboniferous remnant oceanic basin together with the subduction polarity reversal. The northern ocean basin began the S-dipping subduction towards the Early Carboniferous volcanic rocks and formed the Late Carboniferous Qi'eshan volcanic arc and Qishan back-arc basin. The final collision suture is Dacaotan fault between Tarim plate and Dananhu arc. The Carboniferous lithologic associations of Dananhu arc indicate that the East Tianshan Mountains may represent a complex archipelago-ocean basin, and this orogeny involved fore-arc accretion and back-arc basin closure during the whole orogenic process. Juxtaposition of different tectonic units implies that the East Tianshan Mountains orogeny was probably a multiple accretionary orogenic process. |
| Keywords: | Carboniferous lithologic association tectonic evolution Dananhu arc East Tianshan Mountains |
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