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liu shan ma shi ping pen di gou zao te zheng ji qi xing cheng yan hua
Pages: 53-60
Year: Issue:  1
Journal: Oil & Gas Geology

Keyword:  北秦岭褶皱带留山盆地马市坪盆地构造特征盆地演化;
Abstract: Liushan and Mashiping Basins are located in Western Henan Frovince,North QinlingBelt.Their basements are Precambrian-Lower Paleozoie rocks,and the covering series areUpper Triassic,Upper Jurassic-Lower Cretaceous respectively.Liushan Basin is a complex syncline composed of two syncline and an anticlinebelts.The major faults are NWW-strike thrusts which do not control the distribution ofstrata.A complex syncline was also identified in Mashiping Basin.Its axis trend variedfrom NWW to NE-NNE direction,and was cut by boundary fault of the basin;its easternsection was almost completely destroyed by a southward thrust.The Meso-Cenozoic tec-tonic evolution can be divided into seven stages:regional uplift period (ANT_3);depressionperiod after regional uplift(T_3);compresso-uplift period(J_(1+2));fault-subsidence periodin tenso-shear condition(J_3+K_1~1);overthrust-nappe period(K_1~2);extensional fault-subsidence period(K_2+E?)and regional compresso-uplift period(N+Q).The prototype of Liushan Basin was a compressional basin,and that of Mashipingwas an extensional one.Both of them were reformed by large scale southward overthrust-wrenching during late Yenshanian movement and became compresso-shear basins duringthe continent-continental collision between Yangtze and North China Plates.
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