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sequence Stratigraphy of the Jurassic Coal Measures in Northwestern China

Acta Geologica Sinica(English Edition) 2012年第3期86卷 769-778页

作者： WANG Tong SHAO Longyi TIAN Ye LU Jing WANG Wenlong College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083China China Administration of Coal Geology Beijing 100391China

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

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