| 小江断裂带第三纪走滑断陷盆地的充填层序特征 |
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| 引用本文： | 朱炎铭,邵震杰,任文忠,张强.小江断裂带第三纪走滑断陷盆地的充填层序特征[J].沉积学报,2001,19(1). |
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| 作者姓名： | 朱炎铭 邵震杰 任文忠 张强 |
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| 基金项目： | 国家自然科学基金，中国矿业大学校科研和教改项目 |
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| 摘 要： | 小江断裂是滇中走滑断裂系中的一条主干断裂，沿断裂带发育了一系列带有明显走滑特征的新生代小型断陷盆地，第三纪含煤地层主要由冲积扇-湖泊、沼泽成因地层层序构成。本文在对多个断陷盆地的成因地层、充填序列、沉积体系域等剖析的基础上，讨论了走滑构造背景下断陷盆地的充填层序特征，并指出构造沉降、走滑作用和构造反转对盆地充填起作重要作用。
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| 关 键 词： | 走滑断裂断陷盆地成因地层充填序列沉积体系 |
The Infilling Sequence of Tertiary Strike-slip Fault Basins in the Xiaojiang Fault Belt |
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| ZHU Yan-ming,SHAO Zhen-jie,REN Wen-zhong,ZHANG Qiang.The Infilling Sequence of Tertiary Strike-slip Fault Basins in the Xiaojiang Fault Belt[J].Acta Sedimentologica Sinica,2001,19(1). |
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| Authors: | ZHU Yan-ming SHAO Zhen-jie REN Wen-zhong ZHANG Qiang |
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| Abstract: | The Xiaojiang fault belt is a principal fault of the strike-slip fault system in the central part of Yunnan, in which a number of continental basins infilled with Upper Tertiary, Quaternary and modern limnic sediments have been developed. They occur in perfect order and special distribution, and their size, geometrical fea ture,infilling sequence characters and tectonic evolution all record the traces of strike-slip tectonic activities.
On the basis of detailed genetic stratigraphic, basin infilling sequence and depositional system tracts analyses with some basins, this paper reveals infilling sequence characters of strike-slip fault basins. It should be pointed out that the tectonic movement plays a great role in the basin infilling including tectonic subsidence, strike-slip movement and tectonic inversion.
Genetic stratigraphic units are divided according to chrono-stratigraphic inter faces. Each genetic stratigraphic unit must have closely genetic continuity, and possesses about synchronicity. Therefore, it is very important to establish chronostratigraphic interfaces in genetic stratigraphic division. After detailed an alyses of many basin fill sequences in the Xiaojiang fault zone, three types of chronostratigraphic interfaces are defined, i.e. tectonic unconformity, transform interface of facies and broadly swamped event. Base on detailed genetic stratigraphic analyses of some basins,this paper reveals genetic stratigraphic evolution of small fault basins under the control of strike-slip fault.
In the Xiaojiang fault belt,most of coal basins are half-graben fault basin and are controlled by marginal fault. During their development, their sedimentary infilling reveals eminent strike-slip tectonic character. The basin's depocenters and sedimentation not only distribute along the marginal fault, but also appear clear transposition. Based on detailed study of sedimentary structure and sedimentary process, and analyses of genetic characters and well logging curves, the depositional systems of the basins are mainly alluvial-fan system, delt a-fan system and lacustrine-swamp system.
On control of the Xiaojiang fault strike-slip movement, the coal-bearing sequences of fault basins comprise a complete depositional sequence cycle, mainly made up of both alluvial fan-lacustrine-swamp and alluvial fan-fan front depression facies associations, and the vertical transformation of genetic stratigraphic units and the disposition of depositional systems are primarily controlled by the syndepositional structural framework and tectonic activities of the basin.
During later period basin formation, the basin fill sequence was under a transpr ession al tectonic stress-filled which brought about the basinwide structural reversion in appearance of enechelon folds, those fold-axial traces oblique to the main trend of the strike-slip fault zone. It shows the strike-slip movement orientation of the basin' marginal fault. |
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