Petrological characteristics of hydrothermal-sedimentary rocks:A case study of the Lower Cretaceous Tengger Formation in the Baiyinchagan Sag of Erlian Basin, Inner Mongolia
Zhong Da-Kang1,2, Yang Zhe1,2, Sun Hai-Tao1,2, Zhang Shuo3
1 College of Geoscience,China University of Petroleum(Beijing), Beijing 102249; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 3 Resources Development Service Center of Bohai State-owned Assets,Tianjin 300202;
Abstract：In the Baiyinchagan Sag of Erlian Basin,Inner Mongolia,there is a set of hydrothermal-sedimentary rocks occurred in the Tengger Formation and Duhongmu Formation of the Lower Cretaceous. In order to classify hydrothermal-sedimentary rocks,the mineral compositions,textures,structures and mineral assemblages were analyzed by studying the drilling cores,microscopes,field emission scanning electron microscope(FE-SEM),total rock X-ray diffraction,and electron probe analysis(EPMA). The rocks are displayed dark-grey,grey and grey-brown colors. The mineral compositions of rocks are complex and diverse. Dolomite and zeolite(natrolite and analcime)are main rock-forming minerals,and pyrite,magnesite,siderite and barite are secondary minerals,which are mixed with muddy terrestrial sediments composed of clay minerals,quartz,and plagioclase. The textures of hydrothermal-sedimentary rocks can be divided into four types and structures can be divided into nine,which differentiate them from normal lacustrine depositions like carbonate and terrestrial clastic rocks. According to the contents of dolomite,zeolite and terrestrial sediment(marked by 90%,75%,50%,25% and 10%),the hydrothermal-sedimentary rocks are generally divided into argillaceous dolostone,zeolite-bearing dolomitic mudstone and zeolite rock,of which the two formers are major types of hydrothermal-sedimentary rocks in study area. This research would provide an case study to analyze hydrothermal-sedimentary rocks and build depositional model in other basins,as well as enrich theoretical knowledge of sedimentology.
Zhong Da-Kang,Yang Zhe,Sun Hai-Tao et al. Petrological characteristics of hydrothermal-sedimentary rocks:A case study of the Lower Cretaceous Tengger Formation in the Baiyinchagan Sag of Erlian Basin, Inner Mongolia[J]. JOPC, 2018, 20(1): 19-32.
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