| 第四纪华容隆起构造活动、成因及动力机制 |
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| 引用本文： | 柏道远,李长安,王先辉,周柯军,马铁球,彭云益,李纲,陈渡平.第四纪华容隆起构造活动、成因及动力机制[J].地质科学,2010,45(2):411-427. |
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| 作者姓名： | 柏道远 李长安 王先辉 周柯军 马铁球 彭云益 李纲 陈渡平 |
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| 作者单位： | 1.湖南省地质调查院 ,长沙 410011；2.中国地质大学（武汉）地球科学学院 ,武汉 430074 |
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| 基金项目： | 中国地质调查局地质大调查项目，国家自然科学基金 |
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| 摘 要： | 第四纪华容隆起位于江汉—洞庭盆地中部。通过地表观察和第四系钻孔对华容隆起及周缘地貌、第四纪断裂和沉积进行调查,恢复华容隆起构造升降特征与过程,进而探讨华容隆起的成因及其构造活动的动力机制。研究表明:早更新世-中更新世中期华容隆起与周缘凹陷一道沉降,同时前者受周边正断裂控制相对后者有抬升,中更新世晚期一道抬升,晚更新世—全新世构造稳定或弱沉降。第四纪期间华容隆起总体表现为明显的构造沉降。以上表明第四纪华容隆起主要由前第四纪盆—山地貌分异造成,其次与第四纪期间相对周缘凹陷抬升有关。上述地质特征以及区域第四纪地质资料,表明早更新世-中更新世中期江汉—洞庭盆地为断陷盆地,中更新世晚期—全新世转变为坳陷盆地。就华容隆起第四纪构造活动的动力机制进行了探讨并提出:1)早更新世-中更新世中期江汉—洞庭盆地断陷沉降与地幔上隆背景下的深部物质迁出有关。2)中更新世晚期以来的构造活动可能与深部物质蠕移运动的回返以及板块尺度的物质运动和挤压作用有关。3)江汉—洞庭盆地的整体性沉降导致盆地中部的华容隆起以沉降为主;华容隆起特殊的地壳物质结构可能导致深部物质更难向外迁移,使其相对周缘凹陷有抬升。
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| 关 键 词： | 第四纪 华容隆起 构造升降 隆起成因 动力机制 |
| 收稿时间： | 2009-07-16 |
| 修稿时间： | 2009-12-26 |
Tectonic activities, genesis and dynamic mechanisms of Quaternary Huarong uplift |
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| Bai Daoyuan,Li Chang'an,Wang Xianhui,Zhou Kejun,Ma Tieqiu,Peng Yunyi,Li Gang,Chen Duping.Tectonic activities, genesis and dynamic mechanisms of Quaternary Huarong uplift[J].Chinese Journal of Geology,2010,45(2):411-427. |
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| Authors: | Bai Daoyuan Li Chang'an Wang Xianhui Zhou Kejun Ma Tieqiu Peng Yunyi Li Gang Chen Duping |
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| Institution: | 1.Hunan Institute of Geology Survey, Changsha 410011;2.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074 |
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| Abstract: | Quaternary Huarong uplift is lacated at the center of Jianghan-Dongting Basin. Detail geologic mapping and bore data was taken to study on the landforms,Quaternary faults and deposits of Huarong uplift and its adjacent areas,and then to reveal the tectonic rise-subsidenece characteristics and process. On the base of above progresses,the authors discussed the genesis and tectonic movement dynamic mechanisms of Huarong uplift. During Early Pleistocene-middle Middle Pleistocene Huarong uplift and its peripheral sags subsided together while the uplift controlled by several peripheral normal faults rose related to the sags. The uplift and the sags rose side by side in late Middle Pleistocene,and stabilize or subsided weakly during Late Pleistocene-Holocene. Huarong uplift took on obvious subsidence as a whole in Quaternary. All above indicated that Huarong uplift was caused mainly by pre-Quaternary basin-mountain landforms,and secondly by the rise of the uplift related with peripheral sags. Geological characteristics of Huarong uplift and its periphery and regional geology references suggest that Jianghan-Dongting Basin was a faulted basin during Early Pleistocene-late Middle Pleistocene,and a depressional basin during late Middle Pleistoncene-Holocene. The authors discussed and bring forward modes about the dynamic mechanisms of Quaternary tectonic activities of Huarong uplift: 1)The faulted-subsidence of Jianghan-Dongting Basin during Early Pleistocene-middle Middle Pleistocene were related with the movemnet of deep matter to outside under the uplifting of mantle. 2)The tectonic activities since late Middle Pleistocene were possibly related with return of the earlier transported matter,plate-scale matter movement and compression. 3)Unitary subsidence of Jianghan-Dongting Basin made Huarong uplift at center of the basin subsided in the mass; on the other hand,special crust structure of Huarong uplift increased the difficulty of deep matter's movement,which caused Huarong uplift rise related to peripheral sags. |
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| Keywords: | Quaternary Huarong uplift Tectonic uplift and subsidence Genesis of Huarong uplift Dynamic mechanisms |
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