木里煤田构造特征及沉积充填过程研究

通过研究木里煤田构造特征、沉积充填序列来探讨研究区侏罗纪以来构造-沉积演化过程。研究结果表明:(1)研究区发育两组断裂——北西西向—北西向逆冲断断裂和北东—南西向右行走滑断裂,北西西向—北西向断裂相对发育,定型于晚燕山期;北东—南西向右行走滑断裂定型较晚,属喜马拉雅期的产物。褶皱形态以线状褶皱和等厚褶皱为主,属喜马拉雅期的产物。断裂-褶皱构成了单向冲断型复式向斜、单向冲断型复式背斜、对冲型复式向斜;(2)木里煤田侏罗系主要发育三角洲相、曲流河相、湖泊相;(3)木里煤田经历了断陷沉积期(侏罗纪)、隆升剥蚀期(白垩纪-渐新世)、广盆沉积期(中新世)、褶皱冲断期。

The tectonic characteristics and sedimentary filling process of Muli coal field

By studying structure characteristics and sedimentary filling sequences, this paper discusses the Jurassic tectonic and sedimentary evolution process the study area, provides the basis for exploration and exploitation of coal resources in Muli Coal field. The result shows that:there are two groups of faults in the research area, which are NW-NWW thrust fault and NE-SW right lateral strike slip fault. NWW-NW fault formed in the late of Yanshan period isdeveloped. NE-SW right lateral strike slip fault is later and it is the outcome of Himalaya. Fold morphology is linear folds and thick folds, which is the results of Himalaya. Fault-fold constitutes a one-way thrust type compound syncline, one-way thrust type compound anticline, hedge type compound syncline. Delta facies, meandering river facies and lake facies are the main sedimentary facies in Jurassic of Muli Coal field.The coalfield went through of rift sedimentary period (Jurassic), the period of uplift and denudation stage (cretaceous and the Oligocene), wide basin sedimentary period (Miocene), and the period of Fold-thrust