| 梵净山群沉积地质特征与原型盆地分析 |
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| 关键词:Fanjingshan Group turbidite back-arc extension petrotectonics Neoproterozoic |
| 基金项目:中国地质调查局项目(编号: 1212011120115)资助 |
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| Sedimentary Features and Basin Prototype of Fanjingshan Group |
| The Fanjingshan Group, outcropped at the northwest end of the Jiangnan orogenic belt, is a set of low-grade metamorphic volcanic rocks and clastic rocks. The upper part of the Fanjingshan Group could be recognized as turbidite facies and deep marine (bathyal) basin facies. It was divided into Tongchang, Waxi and Duyantang formations. The Tongchang Formation mainly consists of turbidite facies and basin facies, the Waxi Formation is mostly composed of middle fan and outer fan of turbidite facies. The present study of sedimentary facies sequence has revealed that the sedimentary environments from the Huixiangping Formation to Tongchang Formation and to Waxi Formation are of a sedimentary cycle from marine transgression to marine regression. The sediment diffuse of the Tongchang and Waxi formations is in north or northeast direction, suggesting that its source might have been from the south. The particle statistical results show that quartz makes up 23%~34%, consisting mainly of monocrystal quartz. Feldspar makes up 14%~23%, with clasts up to 39%~50%, including sedimentary and volcanic clasts. The source of the Fanjingshan Group was magma arc. In combination with the results obtained and the geochemical analysis of the volcanic tectonic environment of the Huixiangping Formation, it could be concluded that the basin prototype of the clastic rocks of the upper Fanjingshan Group was a initial marginal sea, formed in a back-arc extension. |
| FAN Qi-chao,ZHANG Chuan-heng,YOU Guo-qing,DONG Lin-lin,LIU Dian-bo,LU Chen-ming.2017.Sedimentary Features and Basin Prototype of Fanjingshan Group[J].Acta Geoscientica Sinica,38(4):513-522. |
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