| 被动大陆边缘碳酸盐生长序列与盆山转换耦合 |
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| 关键词:boundary conditions of carbonate growth succession passive continental margin and foreland basin evolution of platform origin of sequence unconformity surface |
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| Succession of Carbonate Growth and its Coupling Relation with Transformation of Basin to Mountain System on the Passive Continental Margin |
| Environment in clean water is the most fundamental condition of carbonate growth and life. So the carbonate despition, which shows an instantaneousity and Periodicity as the sedimentary ban forms and dies out,is related to biogenetic agency and biochemical process and is sensitive to the evolution of the sedimentary ban,the transformation of tectonic setting and Paleogeography.The contact relation of various rocks should not be neglected in the study of plate tectonic and sedimentation of basin. The contact patterns between sedimentary rocks and volcanic rocks,as well as among various sedimentary rocks, reflect the transformation of sedimentation processes and conditions, whiCh is essentially the transformation of-the tectonic settings of the sedimentary basin. In order to reconstruct the evolution of sedimentary tectonic settings and the transformation Process of sedimentary basins to mountain systems, it is necessary to tube the carbonate rocks as a part of the whole accumulation in the basin, to investgate in derail the relationship between the Carbonate sedimentS and other accumulted rocks,and to study the premise conditions, preservation conditions and terminated conditions of the clean water environment for the carbonate sedimentation.The fundamental factors of carbonate growth and life mainly include four boundary conditions as follow:the foundational rest for carbonate growth; the transformation surfaces before and after carbonate depositetion; the internal structure in the carbonate succession; and .the termination pattern of the carbonate succession. The sedimentary basins and transformational processes from basin to mountain system in different pets of various plates all differ in thed four boundary conditions.The boundary conditions of carbonate growth and life changes along with the transformation of the PaSSive continental margin to the foreland basin. Generally, the development of a carbonate Platform and the transformation of a basin's tectonic setting may experience:the initial rift infilling prior to the formation of elastic shelf ; formation of elastic shelf in the late rifting stage;formation of carbonate ramp or carbonate shelf: thermal subsidence and formation of rimmed carbonate platform; foreland fie-curing of the passive margin and formation of foreland carbonate ramp; post-oro-genie foreland molasse in filling.The transformation of tectonic setting in sedimentary basin is concident with eustatic change and their coupling relationship is mancefeted by the isochronous sequence unconformities of five types as follows: uplifted erosion unconformity ;transgression onlap unconformity ; subaquatic hiatus unconformity; subaerial expeure unconformity: and orogenic uplift unconformity. The vertical evolution of these five types of sequence unconformity reflects the whole evolutionary process of the sedimentary basin. Thus,the author sfresses the need to reconsider the carbonate records in orogenic beltS in the lisht of the modern sedimentology and global tectonics and by taking the succession of carbonate growth on the passive continental margin as the typical instance, so as to get the evidence to distinguish the tectonic setting of the basin and the transformational process from basin to mountain system. |
| XU Xiao-song.1996.Succession of Carbonate Growth and its Coupling Relation with Transformation of Basin to Mountain System on the Passive Continental Margin[J].Acta Geoscientica Sinica,17(1):41-53. |
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