Sequence Stratigraphy of the Jurassic Coal Measures in Northwestern China  

作　　者：WANG Tong SHAO Longyi TIAN Ye LU Jing WANG Wenlong 

机构地区：[1]College of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing 100083,China [2]China Administration of Coal Geology,Beijing 100391,China

出　　处：《Acta Geologica Sinica(English Edition)》2012年第3期769-778,共10页地质学报（英文版）

基　　金：supported by the Major National S&T(Science and Technology) Program of China(2011ZX05009-002);the National Natural Science Foundation of China (41002049, 41030213);the Fundamental Research Funds for the Central Universities in China (2010YD09)

摘　　要：The sequence stratigraphy of the Jurassic coal measures of northwestern China has been studied based on data from outcrop and borehole sections. Because of the geological background and the diversity of basin types, such as isochronisms of coal seams and recognition of key sequence boundaries, it is rare to summarize and correlate sequence structure and framework. The types and recognition characteristics of the sequence boundaries of the Jurassic coal measures are revealed by comparing climatic characteristics, structural styles and the base level cycle. A total of five third-order sequences and 15 systems tracts have been subdivided and the sequence stratigraphic framework has been reconstructed confirming that the thick coals accumulated in the late stage of transgression system tracts of sequence I （SQ I） and sequence III （SQ III）. This idea is of important academic significance for instructing coal resources exploration, and enhancing geological effects of prospecting engineering. It is also of practical significance for guaranteeing construction of the large-scale coal production base in northwestern China, accelerating the westward development of the coal industry stratagem.The sequence stratigraphy of the Jurassic coal measures of northwestern China has been studied based on data from outcrop and borehole sections. Because of the geological background and the diversity of basin types, such as isochronisms of coal seams and recognition of key sequence boundaries, it is rare to summarize and correlate sequence structure and framework. The types and recognition characteristics of the sequence boundaries of the Jurassic coal measures are revealed by comparing climatic characteristics, structural styles and the base level cycle. A total of five third-order sequences and 15 systems tracts have been subdivided and the sequence stratigraphic framework has been reconstructed confirming that the thick coals accumulated in the late stage of transgression system tracts of sequence I （SQ I） and sequence III （SQ III）. This idea is of important academic significance for instructing coal resources exploration, and enhancing geological effects of prospecting engineering. It is also of practical significance for guaranteeing construction of the large-scale coal production base in northwestern China, accelerating the westward development of the coal industry stratagem.

关 键 词：depositional system sequence stratigraphic characteristics Jurassic （Hettangian–Callovian） coal basins northwestern China 

分 类 号：P534.3[天文地球—古生物学与地层学] P618.110.2[天文地球—地质学]