蒙阴盆地的成生与演化

蒙阴盆地是在库拉板块向亚洲大陆下俯冲，中国东部隆升伸展板块裂解阶段发育起来的。在中生代，盆地的成生演化经历了侏罗纪拗陷盆地发育阶段和早白垩世拗陷—裂陷阶段。在相应沉积演化过程中，形成侏罗纪湖相红色碎屑岩建造，早白垩世早期滨浅湖—半深湖相灰绿色细粒陆屑岩沉积，早白垩世中期河湖相凝灰质复陆屑岩类夹火山碎屑岩类沉积，早白垩世晚期中基性火山熔岩、火山碎屑岩组合。沉积中心在侏罗纪和早白墨世早期皆偏于西北部，此后，向东南部迁移。晚白垩世，盆地处于风化剥蚀阶段。古近纪，受新生太平洋板块向亚洲大陆下俯冲影响，盆地又处于拗陷—裂陷阶段，相应形成山间河湖相—山麓堆积相类磨拉石建造。古近纪末期，该盆地整体隆起处于长期风化剥蚀状态。

Form and Evolution of Mengyin Basin

Mengyin basin was formed in uplifting strenching pla te cracking period in eastern China which was formed by Kula plate diverting into Asia plate. In Mesozoic period, basin evolution experienced Jurassic depressing and early Cretaceous depression-chasmic stage. In relative sedimentary evolutio n process, some sedimentary combinations were formed as follows: Jurassic lake-f acies red fragementals fundation, early shallow lake-semi-deep lake facies gray-green fine fragementals sedimentary in early Cretaceous, medium Cretaceous river-lake facies tuffaceous continental fragementals with magmatic fragementals sedi mentary, and medium-basic magmatic rocks, magmatic fragementasl in late period. Sedimentary center located in northwest in Jurassic and early Cretaceous, while transferred to southeast part later. In later Jurassic period, basins were in sl acking and exposure stage. Effected by newly formed Pacific plate diverting to A sia plate in Taleogene period, basins were in depression-Chasmic stage, and int ermont river-facies-piledmont deposit facies molasse sedimentary were relatively formed. In late Taleogene period, this basin was wholly in long-period slacking and exposure occurrence.