| 右江盆地层序充填序列与古特提斯海再造 |
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| 关键词:sequence filling succession paleo-Tethyan sea Youjiang basin |
| 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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| Sequence Filling Succession and Paleo-Tethyan Sea Reconstruction of the Youjiang Basin, Southern China |
| 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. |
| QIN Jian-xiong,CHEN Hong-de,TIAN Jing-chun,YANG Zuo-sheng.2000.Sequence Filling Succession and Paleo-Tethyan Sea Reconstruction of the Youjiang Basin, Southern China[J].Acta Geoscientica Sinica,21(1):62-70. |
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