鲁西地区晚中生代以来伸展构造及其控矿作用  

Late Mesozoic Extensional Structure and Its Constrains on Mineralization in Western Shandong

作　　者：李理[1] 钟大赉[2] 时秀朋[1] 唐智博[1] 宫红波[1] 胡秋媛[1] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院,山东东营257061 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质论评》2008年第4期449-458,共10页Geological Review

基　　金：中国科学院知识创新工程(编号KZCX_SW_18_04);国土资源部油气专项(编号XQ_2004_03_01)的成果

摘　　要：鲁西地区存在区域规模的伸展滑脱构造，滑脱构造破碎带是该区进行金矿、铁矿和油气分布预测的关键。浅层次滑脱构造最具规模的位于下寒武统朱砂洞组碎屑岩与太古字变质岩和石炭系一二叠系与奥陶系之间。滑脱面上各种碎裂岩、揉皱发育，伴有动力变质作用，其上朱砂洞组有不同程度的缺失或重复，滑动方向主要向北。深层次滑脱构造主要发育在地壳的低速层，滑动方向与浅层次相反。大规模的构造滑动始于早白垩世（130～110Ma）岩石圈的伸展．始新世（43～37Ma）持续活动。深层次对浅层次构造滑动起控制作用，进而控制了鲁西地区金、铁等似层状矿床的形成、储集和分布，以及烃源岩的形成、油气的储集和分布。Regional décollement structures are found in western Shandong. The interjacent-fractured zone caused by décollementation is a key to predict the distribution of gold deposit, iron ore and oil and gas. The most outstanding décollement structure in shallow level are between cataclastic rocks of the Lower Cambrian Zhushadong Formation and Archean metamorphic rocks, and between Permo-- Carboniferous and Ordovician. In the décollement surface, there are many kinds of cataclastic rocks, folds with dynamometamorphism; some of the Zhushadong Formation is missing and some are repeated above the surface. The main d6collement are directed to the North. The décollement in deep level mainly developed in low-velocity layer of crust, heading to the South. The regional décollement started in Early Cretaceous because of lithosphere extension, and continued to Eocene. The deep level décollement controlled the shallow one, and controlled the formation, accumulation and distribution of the stratoid gold, iron deposit, etc. Meanwhile, it controlled the formation of carbonate rocks and accumulation and distribution of oil and gas.

关 键 词：伸展滑脱构造 晚中生代 新生代 控矿作用 鲁西地区 

分 类 号：P612[天文地球—矿床学]