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• W2361001874 abstract "The Lincang germanium deposit is located in the coal bearing clastic Bangmai basin with granites as the basement rock in Lincang County, western Yunnan Province. There are three coal bearing cycles in the basin. Germanium that is present in the form of organic compounds mainly occurs in the lignite of the first coal cycle (N1b2) close to the basement granites. This cycle consists mainly of clastic rocks, coal seams, layered siliceous rocks and carboniferous siliceous limestones. At the top of Ge rich coal seams, the limestones tightly contact with germanium ore bodies. On the basis of major element, trace element, REE, δ13C and δ18O studies on the limestone in the Lincang germanium deposit, and comparison with some typical continental hydrothermal sediments, the genesis of carboniferous siliceous limestone and its relation with germanium mineralization is discussed. The carboniferous siliceous limestone is black with lamination conformation and inner clastic structure. Its CaO and CO2 contents are 79.47%～90.12%, the ratio of Al/(Al+Mn+Fe) vary from 0.004 to 0.04 (0.021 on an average), while the contents of CaO and CO2 of modern travertins in the Tengchong region are 93.47%～94.04% and Al/(Al+Mn+Fe) ratio 0.01～0.016. The limestone is mainly enriched in Sb, Ge, W, Ba, Cs, Sr and As. Its trace element characteristics are very similar to those of modern travertins in the Tengchong region. In the U Th diagram of different sediments (Rona, 1984), the Lincang limestones distribute in the area of Langban hydrothermal sediments. Compared to the basement, two mica granite, the limestone is obviously enriched in Ge, Sr, Ba and W, but the general trace element composition resembles that of the granites. Both the REE contents of the Lincang limestones and the Tengchong travertins are very low (less than 4.252 μg/g), their NASC normalized REE distribution patterns are basically accordant with each other, with obvious positive Eu anomaly. Meanwhile, the chondrite normalized REE distribution patterns of the Lincang limestones are similar to the basement rock of two mica granites. The δ13C values of the limestones vary from 6.1‰ to 6.9‰,and δ18O from 18.0‰ to 18.7‰,which are very close to the carbon and oxygen isotope composition of modern hydrothermal water and travertin in Longmenshan. The carbon isotope compositions of the limestones are basically accordant with those of other travertins formed under hydrothermal environment (such as the old and young travertins in American Yellow Stone National Park). The content of germanium in the Lincang limestones varies from 40.488 to 93.784 μg/g (66.698 μg/g on an average). At the top of the coal seam close to the Lincang limestones, the content of germanium in lignite obviously increases. There is no significantly germanium concentration and hydrothermal sediments (such as siliceous limestone) in the upper coal bearing cycles (N1b4 and N1b6). Based on the evidences given above, it is concluded that the Lincang limestones are continental hydrothermal sediments, their trace elements and REEs mainly derived from the two mica granites in the basement of the sedimentary basin, and most germanium in lignite is brought by hydrothermal water." @default.
• W2361001874 created "2016-06-24" @default.
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• W2361001874 date "2002-01-01" @default.
• W2361001874 modified "2023-09-25" @default.
• W2361001874 title "Genesis of carboniferous siliceous limestone in the Lincang germanium deposit and its relation with germanium mineralization" @default.
• W2361001874 hasPublicationYear "2002" @default.
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