| 湘东南汝城盆地性质及其对华南燕山早期构造环境的启示 |
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| 引用本文： | 柏道远,汪永清,王先辉,马铁球,张晓阳.湘东南汝城盆地性质及其对华南燕山早期构造环境的启示[J].沉积与特提斯地质,2006,26(1):47-54. |
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| 作者姓名： | 柏道远 汪永清 王先辉 马铁球 张晓阳 |
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| 作者单位： | 1. 湖南省地质调查研究院,湖南,湘潭,411100
2. 湖南省地勘局413队,湖南,常德,415000 |
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| 基金项目： | 中国地质调查局“1∶25万郴州市幅和衡阳市幅区域地质调查”(200213000035) |
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| 摘 要： | 湘东南汝城盆地为一早侏罗世—中侏罗世初期的陆相盆地。下侏罗统心田门组和高家田组主要为内陆湖泊—沼泽相碎屑岩沉积,夹有明显受地壳混染并具低钾高钠特征的板内拉斑玄武岩,表明早侏罗世汝城盆地为同造山上隆伸展裂陷盆地。中侏罗统千佛岩组与下伏高家田组为平行不整合接触关系。千佛岩组下部具类磨拉石沉积特征,上部局部含高家田组玄武质火山碎屑,地层呈西倾单斜式,盆地西缘为逆断裂所压覆等,表明中侏罗世初期汝城盆地为挤压收缩盆地,形成于造山构造环境。结合中生代地质构造发展框架及燕山早期晚阶段后造山花岗岩的大量发育等,认为湘东南及湘粤赣边区早侏罗世—中侏罗世初期属陆内同造山构造环境,中侏罗世早期—晚侏罗世为后造山构造环境。汝城盆地性质的确定对深入研究华南地区中生代构造演化具有重要的启示意义。
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| 关 键 词： | 汝城盆地 燕山早期 构造环境 湘东南 华南 |
| 文章编号： | 1009-3850（2006）01-0047-08 |
| 收稿时间： | 2005-10-13 |
| 修稿时间： | 2005-10-13 |
The nature of the Rucheng Basin in southeastern Hunan and its significance to the tectonic setting of South China during the early Yanshanian |
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| BAI Dao-yuan,WANG Yong-qing,WANG Xian-hui,MA Tie-qiu,ZHANG Xiao-yang.The nature of the Rucheng Basin in southeastern Hunan and its significance to the tectonic setting of South China during the early Yanshanian[J].Sedimentary Geology and Tethyan Geology,2006,26(1):47-54. |
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| Authors: | BAI Dao-yuan WANG Yong-qing WANG Xian-hui MA Tie-qiu ZHANG Xiao-yang |
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| Institution: | 1. Hunan Institute of Geological Survey, Xiangtan 411100, Hunan, China; 2. No. 413 Geological Party, Hunan Bureau of Geology and Mineral Resources, Changde 415000, Hunan , China |
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| Abstract: | The Rucheng Basin in southeastern Hunan is believed to be an Early Jurassic-early Middle Jurassic continental basin.The Lower Jurassic Xintianmen Formation and Gaojiatian Formation are built up of the continental lacustrine-marsh clastic deposits intercalated with low-K and high-Na within-plate tholeiite contaminated by the Earth's crust,indicating that the basin is a synorogenic uplifted extensional rift basin during the Early Jurassic.Till the earliest Middle Jurassic,there existed a parallel unconformity between the Qianfoya Formation and its underlying Gaojiatian Formation.The molasse-like deposits occur in the lower part of the Qianfoya Formation,while the Gaojiatian Formation basaltic volcaniclastics appear locally in the upper part.These strata are west-leaning and monoclinal.The thrust faults are arranged along the western margin of the basin.This implies that the basin was once a compressional basin formed in an orogenic tectonic setting during the earliest Middle Jurassic.The integration of the Mesozoic tectonic framework and occurrence of the early Yanshanian post-orogenic granites shows that southeastern Hunan and HunanGuangdong-Jiangxi border areas were assigned to an intracontinental synorogenic tectonic setting during the Early Jurassic and earliest Middle Jurassic,and a post-orogenic tectonic setting during the early Middle Jurassic and Late Jurassic.The approaches of the nature of the basin will be significant to the research of the Mesozoic tectonic evolution in southern China. |
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| Keywords: | Rucheng Basin early Yanshanian tectonic setting southeastern Hunan southern China |
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