Maceral, Mineralogical and Geochemical Characteristics of the Jurassic Coals in Ningdong Coalfield, Ordos Basin. Issue 6 (December 2014)

• Record Type: Journal Article
• Authors: Zhao, Cunliang; Zhao, Bin; Shi, Zhixiang; Xiao, Lin; Wang, Danhua; Khanchuk, Alexander I.; Ivanov, Vladimir V.; Blokhin, Maxim G.
• Is Part Of: Energy exploration & exploitation. Volume 32:Issue 6(2014)
• Page Start: 965
• Page End: 987
• Publication Date: 2014-12
• Subjects: Minerals in coal -- Elements in coal -- Jurassic -- Ordos Basin -- Ningdong Coalfield; Power resources -- Periodicals; 333.79
• DOI: 10.1260/0144-5987.32.6.965
• Languages: English
• ISSNs: 0144-5987

Abstract

17 samples, including 16 coal-seam samples and one parting, were collected from 4 mines in Ningdong Coalfield, west Ordos Basin, China. Maceral, mineralogy and geochemistry of them were studied by using of optical microscope, LTA-XRD (low temperature ashing-X-ray diffraction), XRF (X-ray fluorescence), and ICP-MS (Inductively coupled plasma mass spectrometry). The results indicate that Ningdong Jurassic coal is a medium volatile bituminous coal, with medium-ash, medium-sulfur and low-medium-calorific. The vitrinite of them is much higher, while the inertinite and liptinite are less, than that of other Early-Middle Jurassic in Ordos Basin. The minerals consist of abundant of quartz, kaolinite, illite, albite, and trace of chamosite, calcite, pyrite. Kaolinite, illite, chamosite, quartz, and albite are origin from weathering productions of gneiss, granulite and granite in Helan Moutain. The coals are enriched by Na2 O, MgO, K2 O, MnO, Ga, Cr, Rb, Sr, Cd, and Ba in comparison with Chinese average abundances of elements in coals. The major carriers Na2 O, MgO, K2 O are clay minerals and albite. The hazardous trace elements, Cd and Cr occur in organic matter and clay mineral, respectively. The rare metals, Ga and Rb are associated with clay mineral. The medium REY are enriched in the coal.