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Xiangtan, China

Chen X.,CAS Nanjing Institute of Geology and Palaeontology | Zhang Y.D.,CAS Nanjing Institute of Geology and Palaeontology | Fan J.X.,CAS Nanjing Institute of Geology and Palaeontology | Tang L.,Guangxi University | Sun H.Q.,Hunan Institute of Geology
Science China Earth Sciences

The onset timing of the Kwangsian Orogeny might differ among localities across South China. Refined stratigraphic works at different localities are necessary to reveal the details of this likely distinction. Recently, we recollected some graptolite specimens from the Ordovician Shixing and Longtouzhai formations (corresponding to the Longxi Formation of southern Jiangxi Province) at many localities in Guangdong Province. The palaeontological and biostratigraphical studies of these graptolite faunas indicate that the facies change from graptolitic shale to nearshore shallow-water, coarse clastics in Guangdong is slightly earlier than that in southern Jiangxi. This timing difference may imply a northward progression of the Kwangsian Orogeny. Based on the biostratigraphy and palaeontology of the Ordovician in the Zhujiang Basin (western part) and Chiangnan Slope Belt (including western Fujian, eastern Guangdong, northern Guangxi, northern Hunan, northeastern Jiangxi, southern Anhui, and western Zhejiang), the Sandbian to late Katian distribution and replacement of biofacies and lithofacies in the two regions are proposed and discussed, which display distinct features at different stages of the Kwangsian Orogeny. © 2012 Science China Press and Springer-Verlag Berlin Heidelberg. Source

Xue H.,China University of Petroleum - East China | Tian S.,China University of Petroleum - East China | Lu S.,China University of Petroleum - East China | Liu M.,Hunan Institute of Geology | And 2 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition)

With the gradual deepening of the natural gas generation and migration mechanism, the dissipated soluble organic matter, which was residual in the source rock and migrated outside the source rocks and didn't form the gathered oil and gas reservoirs in the evolutionary process of kerogen, is gradually getting more attention as a new gas source. The dispersed soluble organic matter into gas is not only related to the consumption of crude oil, but also related to the results of the natural gas resource evaluation, and thus the quantitative evaluation is of great significance to the oil and gas exploration. We summarized and compared the differences between traditional mode of hydrocarbon generation and the dissipated soluble organic matter into gas mode, and established a geological model of the dissipated soluble organic matter into gas, then gave a preliminary calculation of the dissipated soluble organic matter into gas in Tarim basin. And just because of the existence of this gas source, gas generation area is beyond the distribution range of hydrocarbon source rocks. Besides, for this reason, gas generation center migrates to high positions of structures and the period of gas generation is also been put off. By the calculation, the proportion of the dispersed soluble organic matter into gas in the Tarim basin between the source and outside source is 1 to 2.88. The volume of the oil-cracked gas, which is generated on the period between the Late Cretaceous and now days, is 799 hundred billion stere, which is 4.23 times of the traditional oil into gas mode. ©, 2015, Jilin University Press. All right reserved. Source

Zeng J.,Hunan Province Environmental Monitoring Center | Zeng J.,State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants | Zeng J.,Xiangtan University | Qin D.,Hunan Province Environmental Monitoring Center | And 11 more authors.
Chinese Journal of Environmental Engineering

In this work, the combination materials of natural minerals including bentonite, sepiolite and limestone were used as permeable reactive barrier (PRB) filling materials and 16 permeable reactors were designed with orthogonal test method to study the feasibility and efficiency of the PRB technology in the remediation of cadmium contaminated ground-water. The influences of the combination ratio of the minerals on the treatment effect of Cd contamination, the pH of effluents, the porosity and permeability of the barriers were studied. Moreover, the remediation mechanism was also analyzed. The experimental results showed that the Cd removal rates of the applied combination materials were above 99.8%. The dosage of limestone was the main factor controlling to the treatment effect of Cd, which was obviously improved by increasing the amount of limestone. When the limestone content reached 10%, the Cd concentration of simulated Cd-polluted ground-water after treatment was less than 0.7 μg/L, which can meet the class II water quality standard according to groundwater quality criteria (GB/T 14848-93). Increasing the amount of limestone had little effect on the permeability of the barrier, but it led to a weakly alkaline effluent (7 Source

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