Correlation of Carboniferous Depositional Sequences on the Yangtze Plate with Others on A Global Scale
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摘要: 通过对石炭纪扬子板块内部、扬子板块与华北板块及扬子板块与欧美板块之间的不同级别沉积层序对比研究，编制了扬子板块、华北板块和欧美板块石炭纪的海平面变化曲线。在扬子板块内部，上、下扬子区２级沉积层序可以进行对比，但下扬子区海进和海岸上超滞后于上扬子区，由于资料的限制，３级沉积层序的对比还有困难；华北板块Ｆｕｓｕｌｉｎａ－Ｆｕｓｕｌｉｎｅｌａ带内的一个３级沉积层序和Ｔｒｉｔｉｃｉｔｅｓ－Ｐｅｕｄｏｓｃｈｗａｇｅｒｉｎａ带内的四个３级沉积层序，可以和扬子板块同期的３级沉积层序对比；扬子板块和北美中大陆不仅３级沉积层序可以对比，而且在晚石炭世Ｇｚｈｅｌｉａｎ期４级沉积层序也可以进行对比，但由于它们大地构造背景的差异，导致沉积层序组成内容的不同。上述对比结果被认为是冰川型全球海平面变化所形成全球沉积记录同时性的证据。并以冰期与非冰期、联合古陆形成前后等方面对相同板块内和不同板块间沉积层序的数量和级别的异同原因进行了探讨，认为石炭纪冈瓦纳大陆冰川消长是控制全球海平面变化的主要因素，因此，沉积层序应具全球同时性和可对比性，但局部沉积条件差异也将影响沉积层序组成。Abstract: Based on the correlation of the depositional sequences in different orders on the internal YangtzePlate, Yangtze Plate and Huabei Plate, Yangtze Plate and Euramerica Plate, the sea-level curve of theCarboniferous in the main areas of worldwide was worked out. within the Yangtze Plate, the 2nd orderdeposition sequence can be correlated between the Upper Yangtze and Lower Yangtze region, but trans-gression and onlap on the Lower Yangtze region lagged the Upper Yangtze region, the 3rd order deposi-tional sequence can not be correlated because of lacking enough data. In the Huabei Plate, there are one3rd order depositional sequence in the Fusulinella-Fusulina zone and four 3rd order depositional se-quences in the Triticites-Pseuoschwagerina zone, all of them can be correlated with those on the YangtzePlate. Between the Yangtze Plate and the Eurmarican Plate, the 3rd and 4th order can be correlated dur-ing Gzhelian of the Later Carboniferous, but the compositions of the the 4th order depositional sequenceis different because the Yangtze Plate and the North Mid-American continent ( representing the Eurmari-can Plate ) are located in different tectonic setting, the same number of the 4th order depositional se-quences on the two different plates is regarded as the proof of depositional records of synchroneity, whichwas caused by global glacial-eustasy. Those reasons of the similarity and difference on the depositionalsequence orders for the same plate or different plate were discussed both for the glacial period andnonglacial period. The glacial eustasy is the primary factor which controls depositional sequences.There should be global!synchroneity among depositional sequences. But the difference of depositioncondition in the some area will also affect compositions ofdepositional sequences.
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Key words:
- carboniferous /
- Yangtze plate /
- Huabei plate /
- eumerican plate /
- depositional sequence /
- global correlation
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