| 造山带断片型地层层序恢复实例剖析 |
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| 引用本文： | 冯庆来,方念乔.造山带断片型地层层序恢复实例剖析[J].地质科学,1997,32(3):318-326. |
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| 作者姓名： | 冯庆来 方念乔 |
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| 作者单位： | 1. 中国地质大学地球科学学院, 武汉430074;2. 中国地质大学地质矿产系, 北京100083 |
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| 基金项目： | 国家自然科学基金，高等学校博士学科点专科科研基金 |
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| 摘 要： | 南皮河组和怕拍组分布于昌宁一孟连带西缘的耿马、沧源、澜沧地区,前人将其分别划归晚二叠世和早三叠世。新的研究表明,它们不是连续地层,而是由多个地层断片组成。通过逐个地层断片研究,恢复了该区被动陆缘的地层序列。在此基础上,重新进行地层划分,厘定了弄巴组、南皮河组和怕拍组。进而探讨了该被动陆缘的演化历史。
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| 关 键 词： | 昌宁-孟连带 地层断片 被动陆缘地层序列 古特提斯 放射虫 |
| 收稿时间： | 1995-12-25 |
| 修稿时间： | 1995-12-25; |
AN EXAMPLE ON SUCCESSION RECONSTRUCTION OF THRUST SLICE TYPE STRATIGRAPHY IN OROGENIC BELT |
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| Feng Qinglai,Liu Benpei,Fang Nianqiao.AN EXAMPLE ON SUCCESSION RECONSTRUCTION OF THRUST SLICE TYPE STRATIGRAPHY IN OROGENIC BELT[J].Chinese Journal of Geology,1997,32(3):318-326. |
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| Authors: | Feng Qinglai Liu Benpei Fang Nianqiao |
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| Institution: | 1. College of Earth Science, China University of Geosciences, 430074;2. Department of Geology and Mineral Resoures, China University of Geosciences, Beijing, 100083 |
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| Abstract: | The Changning-Menglian belt, representing the main branch of the palaeotethys polyisland ocean in southwestern. Yunnan, lies between the Baoshan-Gengma massif and the Simao massif. The Nanpihe and Papai Formations, deposited in the Baoshan-Genyma continental margin, were formerly considered as continuous stratigraphy, and assigned to Late Permian and Early Triassic respectirely. Our data presented here show that the two lithostraligraphic units are composed of some thrust slices, not continuous lithostratigraphy. In the type sections of the Nanpihe and Papai Formations and other three reference sections, each of those thrust slices is studied in micropalaeontology, stratigraphy, sedimentary enviroment and tectonic background. On the basis of the correlation of those slices,the Middle Devonian to Middle Triassic stratigraphic sequences of the Baoshan-Gengma continental margin are reconstructed, and the Nongba, Nanpihe and Papal Formations are again defined. The Nongba Formation, Middle-Late Devonian to Carboniferous, is mainly composed of tenigenous clastic turbidites and mudstones with black bedded siliceous rocks indicating deep-water stagnant basin on the base; the Nanpihe Formation, Permian, includes mudstones and bedded siliceous rocks intercated thin-bed siltstones which formed in distal turbidity fan and ocean basin margin; the Papal Formation, late Late Permian to Middle Triassic, consists of sandstones, siltstones and mudstones with chert clastic turbidites on the base, showing residual ocean basin and foreland basin enviroments. Last, the evolution history of the passive continental margin is divided into four stges-limited deep-water basin, open basin on the continental slope, residual ocean basin and foreland basin. |
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| Keywords: | Changning-Menglian belt Thrust slice Stratigraphic succession of passive continental margin Palaeotethys Radiolaria |
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