西天山伊宁地块主褶皱幕鄯善运动的确立及地质意义

地层不整合接触是研究地质发展历史及鉴定地壳运动特征和运动时期的重要依据，主褶皱幕是一造山带多幕构造运动中起决定性作用和最为重要的一次构造运动。天山的构造运动幕次多且因地而异，前人认识多有分歧，也没有确立主褶皱幕。伊宁地块伊什基里克山一带上、下石炭统之间为角度不整合接触关系，在岩石组合、沉积环境、古生物地理区系、构造样式、区域大地构造背景等方面差异最为显著，凸显了鄯善运动对区内构造格架和盆山演化起到决定性的作用，因而是主褶皱幕。鄯善运动记录了西天山沟—弧—盆格局消亡，天山残余小洋盆终结，塔里木板块和准噶尔板块最终拼合在一起，形成了统一大陆的重要演化信息。

Definition of the Major Fold Episode Shanshan Movement in Yining Massif,Western Tianshan Mountains,and Its Geological Significance

The unconformity contact of stratum is an important basis in the study of geologic history and the judge of the characters and the date of crustal movement.The major fold episode is one of the decisive role played and the most important tectonic movement in orogenic belt.The fold episode is different in Tianshan areas with different understanding by seientists.As a result,the major fold episode is not established in this area.This is the angle-unconformity contact of stratum between the early and later Carb...