伊通地堑深部软流圈的上涌及其对盆地发育演化的控制和影响  

Aesthenosphere Upwelling in Yitong Graben and Its Role on Formation and Evolution of the Basin

作　　者：余芳[1] 孙家振[2] 张玉芬[3] 

机构地区：[1]中国地质大学研究生院,武汉430074 [2]中国地质大学资源学院,武汉430074 [3]中国地质大学地球物理与空间信息学院,武汉430074

出　　处：《地质科技情报》2009年第3期48-52,共5页Geological Science and Technology Information

基　　金：中国石油吉林油田分公司横向科技攻关项目"伊通盆地构造;沉积与油气藏综合评价"(JLYT-07-01-JS-99-1030)

摘　　要：对广泛分布于伊通地堑边界断裂的新生代玄武岩稀土元素组成进行了岩石圈厚度反演，得到了新生代岩石圈厚度变化情况，并结合该区构造演化特征综合分析得出晚白垩世至更新世发生两期深部熔岩上涌：第一期发生于晚白垩世至古新世，软流圈上涌强度大，上涌至约50km，直接导致伊通盆地的断陷和沉降；第二期发生于中新世11．5～11．0Ma，持续时间短，软流圈上涌强度较弱，表现为隆起构造，对盆地断陷后期起改造作用，控制着莫里青地区尖山构造带的形成以及该地区沉降中心的迁移。By this means, the thickness of lithosphere in Yitong Graben can be evaluated by the rare earth element compositions of Cenozoic basalt distributed along the boundary faults. Analysis by synthesis of the evolution of mantle and structure indicates that mantle upwelling happened twice during the period from late Cretaceous to Pleistocen. The first episode took place from late Cretaceous to Paleocene. Its amplitude value of the aesthenosphere upwelling was large and up to the depth of 50 km, resulting in the rift and subsidence of the graben. The second episode occurred in Miocene（11. 5-11. 0） Ma, but it did not last long, with its aesthenosphere upwelling not as intense as the first one. Some uplift zones, formed in this time, are responsible for the reform in late period of the formation of this basin, which especially caused the generation of Jianshan structure zone and the shifting of the center of subsidence in the Moliqing region.

关 键 词：伊通地堑 岩石圈厚度 玄武岩 起源最终深度 软流圈上涌 尖山构造带 

分 类 号：P542.5[天文地球—构造地质学]