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Liao Y.-P.,Sun Yat Sen University | Cao J.-J.,Sun Yat Sen University | Cao J.-J.,Guangdong Key Laboratory of Geological Process and Mineral Resources Exploration | Wu Z.-Q.,Sun Yat Sen University | And 2 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2015

Take the cores and surface weathered soil from the Cretaceous red beds in the western of Dongshengmiao mine of Inner Mongolia and analysis with near-infrared spectroscopy. The result shows that near-infrared spectroscopy can identify mineral quickly through the characteristic absorption peaks of each group. The Cretaceous red beds in the western of Dongshengmiao mine is argillaceous cementation, it is mainly composed of quartz, feldspar, montmorillonite, illite, chlorite, muscovite etc, the mineral composition is mainly affected by the upstream source area. The clay mineral like montmorillonite water swelling and uneven drying shrinkage expands the original crack and creates new cracks, reduces its strength, which is the mainly reason of its disintegration. According to the composition of clay mineral, we speculate its weathering process is mainly physical weathering, the climate during the weathering is cold and dry. The results can not only improve the geological feature of the mining area, but also show that the near-infrared spectroscopy technology can analyze the mineral composition of soil and rock effectively on the basis of Mineral spectroscopy, which demonstrates the feasibility of the near-infrared spectroscopy can analyze minerals in soil and rock quickly, that shows the feasibility in geology study, provides new ideas for the future research of soil and rock. © 2015, Science Press. All right reserved. Source


Cao J.J.,Sun Yat Sen University | Cao J.J.,Guangdong Key Laboratory of Geological Process and Mineral Resources Exploration | Li Y.K.,Sun Yat Sen University | Jiang T.,Sun Yat Sen University | Hu G.,Sun Yat Sen University
Atmospheric Chemistry and Physics | Year: 2015

Sources of sulfur dioxide, sulfates, and organic sulfur compounds, such as fossil fuels, volcanic eruptions, and animal feeding operations, have attracted considerable attention. In this study, we collected particles carried by geogas flows ascending through soil, geogas flows above the soil that had passed through the soil, and geogas flows ascending through deep faults of concealed sulfide ore deposits, and analysed them using transmission electron microscopy. Numerous crystalline and amorphous sulfur-containing particles or particle aggregations were found in the ascending geogas flows. In addition to S, the particles contained O, Ca, K, Mg, Fe, Na, Pb, Hg, Cu, Zn, As, Ti, Sr, Ba, Si, etc. Such particles are usually a few to several hundred nanometres in diameter with either regular or irregular morphology. The sulfur-containing particles originated from deep-seated weathering or faulting products of concealed sulfide ore deposits. The particles suspended in the ascending geogas flow migrated through faults from deep-seated sources to the atmosphere. This is a previously unknown source of the atmospheric particles. This paper reports, for the first time, the emission of sulfur-containing particles into the atmosphere from concealed sulfide ore deposits. The climatic and ecological influences of these sulfur-containing particles and particle aggregations should be assessed. © 2015 Author(s). Source


Wu Z.-Q.,Sun Yat Sen University | Wu Z.-Q.,Guangdong Key Laboratory of Geological Process and Mineral Resources Exploration | Cao J.-J.,Sun Yat Sen University | Cao J.-J.,Guangdong Key Laboratory of Geological Process and Mineral Resources Exploration | And 3 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013

The authros collected the soil samples uniformly above the target ore district and analyzed them with the near infrared spectrum. The results show that the NIR could identify the minerals in the soil well, including the combination of altered minerals roughly. Contrasting these mineral combination with the characteristics of orebody, we found that there was a certain degree of correlation between the soil and the concealed orebody, especially the altered minerals which was consistent with the altered conditions of this deposit. Therefore, we thought that any mineral composition of soil could be used to indicate some information from deep orebody and provide some basis for finding this type of copper. In addition, we also thought that the NIR information contained in the soil above the oreboday could serve as an effective research method inproviding some basis for prospecting. And we can use it for other deposits, especially for the deeply concealed orebody and some regions with a fragile geological environment. Source


Jiang L.-T.,Sun Yat Sen University | Jiang L.-T.,Guangdong Key Laboratory of Geological Process and Mineral Resources Exploration | Chen G.-N.,Sun Yat Sen University | Chen G.-N.,Guangdong Key Laboratory of Geological Process and Mineral Resources Exploration | Peng Z.-L.,Sun Yat Sen University
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013

Red pigment of continental red-bed is known originating from the fine-particle hematite in the rocks. Advance of researches on the origin of continental red-bed demonstrates that the red pigment of red-bed originated from its diagenetic but not depositional process. The high diagenetic temperature causes the dehydration of iron hydrate to form hematite, generating the red pigment. For examining the above hypothesis, the authors of this paper designed an experiment to approach the reddening process, i.e. formation of the red pigment of continental red-bed. Black ooze sampled from the Holocene sediments of the Pearl River Delta was heated in different ways. The diffuse reflectance spectroscopy (DRS) of those heated ooze samples were detected with Perkin-Elmer Lamdba 950 ultraviolet/visible/near-infrared spectrophotometer, and moreover, red-values of the samples were calculated for determining their coloring levels. Iron in black ooze sediment is predominantly in the form of goethite. Experimental results verified that initial dehydration-temperature of goethite is about 150°C, either enhancing temperature or prolonging heating time is accompanied with decreasing goethite and increasing hematite, and a positive relationship exists between red-value of samples and peak-height of hematite. The experimental results strongly support the idea of thermal origin of continental red-bed. Source


Luo S.-Y.,Sun Yat Sen University | Cao J.-J.,Sun Yat Sen University | Cao J.-J.,Guangdong Key Laboratory of Geological Process and Mineral Resources Exploration | Yi Z.-B.,Sun Yat Sen University | And 2 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2016

The six groups of fault gouge samples were collected in different middle-sections from the underground mine of the Weilasituo zinc-copper polymetallic deposit, Inner Mongolia. The samples were analyzed with X-ray diffraction (XRD) and near infrared spectrum (NIR)to explore the mineral composition features of the fault gouges and their relationship with mineralization. The results are as follows: (1) The fault gouge samples contain the clay minerals which were formed in the low temperature alteration (such as montmorillonite, kaolinite, dickite, chlorite etc.), the alteration minerals in the medium temperature or high temperature hydrothermal environment (such as graphite, black mica, pyrophyllite, barite, serpentine, tremolite, actinolite etc.), and also the mineral compositions which were closely related to mineralization (such as copper-zinc oxide, copper-vanadium-chloride, azurite, bornite etc.). (2) The mineral compositions of the fault gouge from different depth are different. Shallow earth's surface is mainly consisted of the low metamorphic minerals, and deep underground is mainly consisted of the high metamorphic minerals. (3) The mineral composition, mineral genesis and law of development of evolution of fault gouges suggest that, they were formed in the ore and metallogenic tectonic hydrothermal activity period, and had experienced the supergene oxidation later. (4) Through the analysis of the mineral compositions and alteration mineral assemblage characteristics of the fault gouges we can speculate that, the ore deposit was formed in medium-high temperature hydrothermal environment which had experienced the process of silicide, kaolinite, chloritization, hotaru petrochemical and sericitization alteration. Therefore, the analysis of the mineral compositions and mineral assemblage characteristics of the fault gouges, not only have certain practical significance for prospecting, but also can provide important reference information to study the genesis of the deposit. © 2016, Peking University Press. All right reserved. Source

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