桂西地區(qū)二疊系合山組鋁土巖的沉積環(huán)境
[Abstract]:The sedimentary environment of the Permian Heshan formation bauxite in western Guangxi has marine and continental contentions. Based on the regional investigation of Permian bauxite in western Guangxi and the analysis of trace element geochemical data of borehole samples, it is concluded that the Permian bauxite occurred in continental environment in western Guangxi. From the distribution of bauxite rocks, bauxite deposits are widely distributed on the Permian isolated carbonate platforms in western Guangxi. The characteristics of bauxite deposits in this region prove that the ore beds were formed in the environment where the carbonate platforms were exposed to the surface of the earth. According to the contact relationship between the bauxite strata and the limestone of the Xiafumaokou formation, there is a maokou limestone gravel at the bottom of the bauxite formation, and some phenomena such as filling the limestone of the Xiafumaokou formation with the limestone of the Xiafumaokou formation can be seen in some sections. It shows that the mineralization process of bauxite is directly completed on the paleo karst surface of Maokou formation limestone. In addition, fossils of paleoplant rhizomes found in ore beds are also strong evidence of the formation of bauxite in terrestrial environments. The results of trace element geochemistry show that the boron content of bauxite rock samples is less than 10 脳 10 ~ (-6) m ~ (-1) Sr / Ba in the range of 0.29 ~ 1.61, the average value is 0.92% Rb / R ~ (-1) K = 0.0011 ~ 0. 0025, and the average value is 0.0017, respectively. The above indexes combined with the V/Zr-Zr/Cu diagram show that the bauxite was formed in the continental fresh water environment.
【作者單位】: 廣西地質(zhì)調(diào)查院;中國地質(zhì)大學(xué)(武漢)地球科學(xué)學(xué)院;
【基金】:中國地質(zhì)調(diào)查局計(jì)劃項(xiàng)目“南嶺成礦帶地質(zhì)礦產(chǎn)調(diào)查”子項(xiàng)目“桂西整裝勘查區(qū)鋁土礦床成因與富集規(guī)律研究”(編號(hào):12120113064200)~~
【分類號(hào)】:P618.45
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