【摘要】 本文根据松嫩平原莫莫格孔地层中粘粒矿物分析结果,依据粘粒矿物组合特征及演变规律,并结合古生物和地层岩性资料,恢复松嫩平原晚白垩纪(明水二段)—晚第三纪—第四纪更新世时期的沉积环境和古气候状况。更多还原

【Abstract】 This paper emphatically studies the.formation,composition and evolution regularity of clay minerals in strata of Momoge drill hole.According to the data of paleobiology and strata lithology,paleosedimentary environment and paleoclimate are restored,paleogeography is reconstructed in the Songnen Plain from the late Cretuceous,the Neogene,to the Pleistocene of the Quaternary. In the strata of the late Cretaceous,montmorillonite,as enclosed water- body mineral,is dominant with good crystallinoty,reflecting the lakeshore sedimentary feature and hot and slightly wet paleoclimate at that time. In the Neogene,influenced by global warm and humid climate,the basin was in the.period when lakes and rivers alternately developed,corresponding forming 5 clay mineral association zones in which kaolinite or montmorillonite was alternately as main mineral.The climate underwent such change process from,hot and dry,hot and humid,warm and relatively dray warm and relatively 1 umid,to warm and slightly dry. In the Pleistocene of the Quaternary,iniluenced by global glacial climate, lakes,swamps and basnis in linland gradually shrank,at last became dry and cold steppes.In clay mineral association zones,illite was main minearal,ad- ding into chlorite,Pale■limate underwent the provcss from cold and dry, warm and humid,warm and dry,to cold and dry.更多还原