赣西北莲沱组较深浅水沉积类型的发现及其地质学意义
THE DISCOVERY AND GEOLOGICAL IMPLICATIONS OF THE DEEPER SHALLOW-MARINE SEDIMENT TYPES IN THE LIANTUO FORMATION,NORTHWESTERN JIANGXI
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摘要: 本文论述了赣西北莲沱组小规模重力流出现,不仅仅是一种沉积环境改变,而是一种事件沉积作用,其在地质学上的意义十分巨大。它不仅仅具良好的相分析、层序地层配套以及对其上的南沱组成因地层分析具重要作用,而且更为重要的是具良好的构造古地理、板块活动标志。Abstract: The small-scale gravity-flow deposits considered as the event sediments at the upper-most part of the Liantuo Formation,north western Jiangxi indicate a progressively increas-ing depth of sedimentary environments rather than a simple terrestrial-marine transition. The retrogradational sediments from continent to foreshore to shelf produced by increasing expansion of transgressions in the early and middle stages of the deposition of the Liantuo Formation show a gradually deepening of sea water,whereas the intercalations of the sea-ward progradational small-scale gravity flow sediments and thick massive non-gravity flow sediments generated during the late stage of it represent relatively complicated sediments. The small-scale gravity-flow sediments in the study area may not only play an impor-tant part in facies analysis,sequence stratigraphic analysis and genetic analysis of the grav-el-bearing tillites overlying the Nantuo Formation,but also serve as good indicators for the reconstruction of tectono-palaeogeography and plate tectonics.
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Keywords:
- gravity flow /
- highstand systems tract /
- geological implication /
- Sinian /
- northwestern Jiangxi
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