安徽巢北早石炭世和州组沉积特征及旋回地层
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摘要
巢湖北部地区位于下扬子板块北部边缘部分,下石炭统发育良好,分布广泛,其中和州组发育特征明显。在进行详细的野外测量和描述基础上,对和州组剖面进行岩石学沉积环境沉旋回性分析,确定了该组的沉积构造并探讨了旋回地层的成因。和州组剖面由5个水体向上变浅的旋回组成,Ⅰ、Ⅱ、Ⅲ旋回下部为灰岩,上部为泥岩,构成下厚上薄的的结构单元,反映水体周期性向上变浅,属于开阔台地沉积环境;旋回Ⅳ、旋回Ⅴ,达到最大海侵,为台地边缘浅滩相沉积环境。石炭纪扬子板块的海平面变化受冈瓦纳大陆冰川消长影响显著,沉积层序具有等时性,冈瓦纳大陆冰川型全球海平面变化是控制沉积旋回的主要因素。
The north of Chaohu Lake area is situated at the north margin of lower Yangtze plate,where Lower Carboniferous Series is well developed and vastly distributed,in which,the Hezhou Formation has distinct developing characteristics.Based on detailed field survey and description,analyzed petrology and sedimentary cyclicity of the formation section,determined sedimentary tectonics and discussed the genesis of cyclic strata.The section is composed of 5 cycles showing the water body shoaling upwards.The lower part of cycles I,II and III is limestone,upper part mudstone,constitutes thick lower part and thin upper part constitutional units reflecting periodically shoaling of water body upwards and belonged to open platform environment.Cycles IV and V have reflected maximum marine transgression and belonged to the marginal platform shoal facies sedimentary environment.Eustatic fluctuation of the Yangtze plate during Carboniferous Period was obviously impacted by ebb and flow of the Gondwanan glacial events;sedimentary sequences have isochroneity,thus the Gondwanan glacial type global eustasy is the primary controlling factor of sedimentary cycles.
The north of Chaohu Lake area is situated at the north margin of lower Yangtze plate,where Lower Carboniferous Series is well developed and vastly distributed,in which,the Hezhou Formation has distinct developing characteristics.Based on detailed field survey and description,analyzed petrology and sedimentary cyclicity of the formation section,determined sedimentary tectonics and discussed the genesis of cyclic strata.The section is composed of 5 cycles showing the water body shoaling upwards.The lower part of cycles I,II and III is limestone,upper part mudstone,constitutes thick lower part and thin upper part constitutional units reflecting periodically shoaling of water body upwards and belonged to open platform environment.Cycles IV and V have reflected maximum marine transgression and belonged to the marginal platform shoal facies sedimentary environment.Eustatic fluctuation of the Yangtze plate during Carboniferous Period was obviously impacted by ebb and flow of the Gondwanan glacial events;sedimentary sequences have isochroneity,thus the Gondwanan glacial type global eustasy is the primary controlling factor of sedimentary cycles.
引文
[1]钱铮,李淳,马在平.安徽巢北地区下石炭统高骊山组风暴沉积[J].石油大学学报(自然科学版),1996,20(5):8-10.
[2]叶连俊,严钦尚.沉积构造与环境解释[M].北京:科学出版社,1984:42-45.
[3]ANDERSON E J,GOODWIN P W.The significance of meter scalealloycles in the quest for a fundamental stratigraphic unit[J].Journal ofGeology,1990,(147):507-518.
[4]梅冥相,徐德斌,周洪瑞.米级旋回层序的成因类型及其相序组构特征[J].沉积学报,2000,18(1):43-62.
[5]梅冥相.碳酸盐米级旋回层序的成因类型及识别标志[J].岩相古地理,1993,13(6):35-45.
[6]梅冥相.碳酸盐旋回与层序[M].贵阳:贵州科技出版社,1995:1-245.
[7]罗光文,梅冥相,苏德辰.露头碳酸盐岩旋回层序的识别与划分[J].石油勘探与开发,1998,25(2):13-16.
[8]李儒峰,刘本培,赵澄林.扬子板块石炭纪沉积层序及其全球性对比研究[J].沉积学报,1997,15(3):23-28.
[9]高进.冈瓦纳石炭纪冰川与古陆的解体及其在世界大地构造格局形成中的意义[J].湖南科技大学学报(自然科学版),1987,(01):22-27.
[10]Veevers J J,Powell C.Late Paleozoic glacial episodes in Gondwanaland reflected in transgressive-regressive depositionalsequences in Euramerica[J].Geological Society of America Bulletin,1987,(98):475-487.
[11]Crowley T J,Baum S K.Estimating carboniferous sea-levelfluctuation from Gondwnan ice extent[J].Geology,1991,(19):975-977.
[2]叶连俊,严钦尚.沉积构造与环境解释[M].北京:科学出版社,1984:42-45.
[3]ANDERSON E J,GOODWIN P W.The significance of meter scalealloycles in the quest for a fundamental stratigraphic unit[J].Journal ofGeology,1990,(147):507-518.
[4]梅冥相,徐德斌,周洪瑞.米级旋回层序的成因类型及其相序组构特征[J].沉积学报,2000,18(1):43-62.
[5]梅冥相.碳酸盐米级旋回层序的成因类型及识别标志[J].岩相古地理,1993,13(6):35-45.
[6]梅冥相.碳酸盐旋回与层序[M].贵阳:贵州科技出版社,1995:1-245.
[7]罗光文,梅冥相,苏德辰.露头碳酸盐岩旋回层序的识别与划分[J].石油勘探与开发,1998,25(2):13-16.
[8]李儒峰,刘本培,赵澄林.扬子板块石炭纪沉积层序及其全球性对比研究[J].沉积学报,1997,15(3):23-28.
[9]高进.冈瓦纳石炭纪冰川与古陆的解体及其在世界大地构造格局形成中的意义[J].湖南科技大学学报(自然科学版),1987,(01):22-27.
[10]Veevers J J,Powell C.Late Paleozoic glacial episodes in Gondwanaland reflected in transgressive-regressive depositionalsequences in Euramerica[J].Geological Society of America Bulletin,1987,(98):475-487.
[11]Crowley T J,Baum S K.Estimating carboniferous sea-levelfluctuation from Gondwnan ice extent[J].Geology,1991,(19):975-977.
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