| 湘东北湘阴凹陷控盆断裂特征、盆地性质及动力机制研究 |
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| 引用本文： | 柏道远,刘波,倪艳军,马铁球,王先辉,彭云益,李纲.湘东北湘阴凹陷控盆断裂特征、盆地性质及动力机制研究[J].火山地质与矿产,2010(3):157-168. |
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| 作者姓名： | 柏道远 刘波 倪艳军 马铁球 王先辉 彭云益 李纲 |
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| 作者单位： | [1]湖南省地质调查院,湖南长沙410011 [2]湖南省常德市地质环境监测站,湖南常德415000 |
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| 基金项目： | 中国地质调查局地质大调查项目（1212010610706）资助 |
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| 摘 要： | 对白垩纪-古近纪洞庭盆地东部湘阴凹陷的北部进行了地表地质调查与研究。凹陷呈NE走向,沉积岩层倾向南东,且自南东往北西倾角变陡。凹陷南段宽、北段窄,其南东边界分别为倾向NW的公田断裂和忠防断裂,两断裂之间以走向NW、倾向南西的白羊田断裂和石姑桥断裂相连接。公田断裂为正断裂,白羊田断裂和石姑桥断裂为右旋平移正断裂,忠防断裂为左行平移正断裂;公田断裂和石姑桥断裂均经历了自韧性→脆性的转变过程。凹陷内部发育NE~NNE向小型同成盆正断裂。上述信息表明：①湘阴凹陷为箕状断陷盆地;②公田断裂和忠防断裂的拉张活动控制了凹陷的形成和发展,区域N（N）E向左旋走滑应力场对凹陷北段有一定影响;③白羊田断裂和石姑桥断裂属横向调整断裂;④凹陷发展及其沉积充填,与南东面幕阜山隆起的抬升与剥蚀（包括沉积剥蚀和构造剥蚀）相耦合。结合区域资料,讨论认为湘阴凹陷形成的伸展构造环境受本地区特有的地幔上隆深部构造背景与中国东南部区域张性构造环境的双重制约,并以前者为主;凹陷走向主要受区域NNE向左行走滑应力场的控制。
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| 关 键 词： | 白垩纪-古近纪 湘阴凹陷 断裂特征 盆地性质 动力机制 |
Characteristics of basin-controlling faults,basin type and dynamic mechanisms of the Xiangyin Sag in northeastern Hunan |
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| BAI Dao-yuan,LIU Bo,NI Yan-jun,MA Tie-qiu,WANG Xian-hui,PENG Yun-yi,LI Gang.Characteristics of basin-controlling faults,basin type and dynamic mechanisms of the Xiangyin Sag in northeastern Hunan[J].Volcanology & Mineral Resources,2010(3):157-168. |
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| Authors: | BAI Dao-yuan LIU Bo NI Yan-jun MA Tie-qiu WANG Xian-hui PENG Yun-yi LI Gang |
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| Institution: | 1.Hunan Institute of Geology Survey,Changsha Hunan,410011,China)(2.Geological Enviromental Monitoring station of Changde,Changde 415000,China) |
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| Abstract: | The authors surveyed near-surface geological characters of north Xiangyin Sag to the east of Cretaceous-Paleocene Dongting basin.The Sag trends NE, with the sedimentary layer inclining to southeast and the dip angle becoming greater from southeast to northwest.South segment of the Sag is wide while north segment narrow.The southeast boundary of the south and the north segments is respectively NW-inclining Gongtian fault and Zhongfang fault which are connected by NW-trending and SW-inclining Baiyangtian fault and Shiguqiao fault.Gongtian fault is a normal fault;Baiyangtian fault and Shihuqiao fault are dextral strike-slipped normal faults;Zhongfang fault is a sinistral strike-slipped normal fault.Gongtian fault and Shihuqiao fault changed from early ductile to later brittle.There occurred NE-to NNE-trending small-scale syn-basin normal faults in the Sag.All above show information as follows： ① the Xiangyin Sag is a half-graben-basin;② the extension of Gongtian fault and Zhongfang fault controlled the forming and expanding of the Sag,while regional dextral N（N）E-strike-slipped stress field threw some impact on the north segment;③ Baiyangtian fault and Shiguqiao fault are northeast boundary regulative faults.④ development of the Sag and sedimentary filling coupled with the uplifting and tectonic denudation and weathering erosion of Mobushan uplift to the southeast of the Xiangyin Sag.Based on the studies of Xiangyin Sag in this paper and regional geological features,the authors probe into the tectonic settings and dynamic mechanisms of the Xiangyin Sag and bring forward ideas as follows： extensional tectonic setting controlling basin-forming was primarily caused by local especial deep structure background of mantle uplifting,and secondly by regional extensional tectonic setting in southeast China;NE-trending of the Xiangyin sag was primarily controlled by regional dextral NNE-strike-slipping stress field. |
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| Keywords: | Cretaceous-Paleocene Xiangyin Sag features of faults characteristics of basin dynamic mechanisms |
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