| 右江盆地层序充填序列与古特提斯海再造 |
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| 引用本文：覃建雄,陈洪德,田景春,杨作升.2000.右江盆地层序充填序列与古特提斯海再造[J].地球学报,21(1):62-70. |
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| 基金项目:国家自然科学基金!(青年 )项目 (编号 4 95 0 2 0 3 6)，地矿部“九五”重点科技攻关项目!(编号 95 - 0 2 - 0 0 ) |
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| 中文摘要:首次识别出5个级别的层序界面及相应的沉积层序,以不同级别的层序界面作为划分相应级别层序的重要标志,不同级别的层序反映不同地质事件和动力转化过程。将5个级别的沉积层序作为板间、板缘、板内构造过程的地层记录,反映了沉积盆地类型、性质及演化过程,并与沉积盆地之间存在不同级别的耦合效应:超级层序相当于沉积盆地域的地层记录;Ⅰ级层序对应于一个成因盆地的地层记录;Ⅱ级层序反映沉积盆地的构造阶段或构造沉积幕;准Ⅱ级层序揭示盆地构造期或沉积幕;Ⅲ级层序相当于盆地充填韵律;Ⅳ级、Ⅴ级层序分别相当于盆地充填体系域和冲填体系。研究表明,右江古特提斯海演化经历了陆内裂陷海、陆缘裂谷海、孤后裂谷海和残余海前陆盆地4个发展阶段。 |
| 中文关键词:层序充填序列 古特提斯海 右江盆地 |
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| Sequence Filling Succession and Paleo-Tethyan Sea Reconstruction of the Youjiang Basin, Southern China |
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| Abstract:In the light of the sequence basin plate theory in conjunction with stratigraphy, sedimentology, basin analysis and sequence stratigraphy, the filling succession and paleo-Tethyan sea reconstruction in the Youjang Basin has been tentatively studied based on following aspects:①sequence boundary and basin mountain transformation; ②sequence hierarchy and basin filling framework; and ③sequence filling process and basin evolutional history. Five hierarchies of sequence boundaries and related five ranks of sequences have been recognized initially. Different ranks of sequence boundaries, serving as important indicators for sequences, reflect various geological events and transformational processes, of which large scale (larger than to 2nd scale)boundaries reflect transformations of processes and stress mechanisms, small scale(3th to 5th) boundaries reveal transformational processes of basin accommodation and sedimentary mechanism driven by structruaral activites, sea level changes, climatic fluctuation, supply etc. Sequences of differrent scales, as the stratigraphic records of internal, marginal and intraplate tectonic processes, reflect the type, nature, characteristics, evotution and possess of a certain intrinic coupling of different scales within sedimentary basins: the superscale sequence, as stratigraphic records global tectonic (supercontinent or Wilson) cycles, corresponds to the sedimentary basin tracts consisting of basins of differrent geneses; 1st scale sequence is equivalent to the sedimentary basin of a centain geneses; 2nd scale sequence is consistent to the tectonic stage or depositional episode; 3rd scale sequence is commensurate with filling rythms of basins; and 4th and 5th scale sequencs is respectively equal to filling system tracts and filling system of depobasins. Therefore, by means of filling framework of different scale sequences, the basinal evolution process and plate nature and then the evolution history of the Earth can be revealed. The authors hold that the Youjiang Paleo Tethyan Sea evolution includes intracontinental rifting sea, passive continent marginal rifting sea, retroarc rifting sea and foreland basin. |
| keywords:sequence filling succession paleo-Tethyan sea Youjiang basin |
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