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WhatsApp: +86 18221755073Thus, all lines of evidence favor the DP mechanism for the smectite illitization in the PTB K-bentonites of South China. The SST mechanism involves the gradual and topotactic transformation of smectite into illite, which is accompanied by gradual changes in structural ordering and polytype, and the extent of these changes is proportional to the ...
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WhatsApp: +86 18221755073Palygorskite clays sampled from palygorskite clay deposits in Jiangsu and Anhui provinces were investigated by transmission electron microscopy (TEM). Many intergrowth phenomena of special ultra-microstructure between smectite and palygorskite were found. The ultra-microstructure indicates that palygorsite fiberrous crystals grow along (001) of primary smectite through …
WhatsApp: +86 18221755073Smectite, a major barrier material for contaminants in Earth's critical zone, is a layered aluminosilicate mineral with cis-vacant (cv) and ... confirming that montmorillonites have cv structure and almost all smectites from China (over 11 provinces) are cv. This study provides a molecular-level understanding of the thermal reaction ...
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WhatsApp: +86 18221755073The maturation of organic matter has been implicated in accelerating the conversion rate of smectite to illite by increasing the Gibbs free energy of illite growth [75].
WhatsApp: +86 18221755073Above 3100 m, the smectite illitization in dark mudstones was delayed due to the OM pillar effect in the interlayer spaces of smectite. Below 3100 m, the interlayer OM became varied and desorbed, discharging organic acid. This led to the dissolution of smectite structural layers. Consequently, illitization in the dark mudstone was accelerated.
WhatsApp: +86 18221755073Samples of argillaceous source rocks from three sub-members of the Shahejie Formation (Es) in the Dongying Depression, China, were collected to investigate the differences in hydrocarbon generation among the sub-members, which developed in fresh (Es 3 2, Es 3 3) and saline (Es 4 1) water environments. Pyrolysis, XRD and thermo-XRD analyses were used to …
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WhatsApp: +86 18221755073I/S (Illite-smectite mixed layer) is the transition product in the process of transformation from smectite to illite, which is composed of smectite crystal layer and illite crystal layer ...
WhatsApp: +86 18221755073Interactions between organic matter (OM) and clay minerals have received considerable attention in previous studies. The inflence of OM on smectite illitization has been analyzed primarily in simulation experiments rather than in diagenetic studies. The present study explores the influence of OM on smectite illitization during diagenesis. Thirty red and dark …
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WhatsApp: +86 18221755073The North China Permian-Carboniferous basin consists of Permian-Carboniferous systems composed of marine and nonmarine coal-bearing sequences. Clay diagenesis in these basins was studied by systematic x-ray diffraction analysis. The clay mineralogy consists of illite, smectite, mixed-layered illite/smectite (I/S), kaolinite, and chlorite.
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WhatsApp: +86 18221755073Article: Occurrence and origins of minerals in mixed-layer illite/smectite-rich coals of the Late Permian age from the Changxing Mine, eastern Yunn Minerals in coals from the Changxing Mine of eastern Yunnan, southwestern China, were investigated using low temperature ashing plus X …
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WhatsApp: +86 18221755073Experimental illitization of smectite has been simulated by means of hydrous pyrolysis, using a smectite-rich starting material from a Lower Tertiary claystone from the Oseberg field, North Sea. The <2 µm fraction was subjected to hydrous pyrolysis using KCL solutions at concentrations of 1.0 and 0.01 N, temperatures from 180-350°C and ...
WhatsApp: +86 18221755073minerals Article Origin of Smectite in Salinized Soil of Junggar Basin in Xinjiang of China Haixia Xie 1,2,†, Shuai He 3,†, Chuanqin Huang 1 and Wenfeng Tan 1,* 1 Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei 430070, China;
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WhatsApp: +86 18221755073Smectite accumulation/formation increased during EECO due to seasonal wet and dry. ... China, with the goal of determining their origin and paleoclimatic significance. Twelve smectite-rich vertisol samples were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), inductively coupled plasma-mass spectrometry (ICP ...
WhatsApp: +86 18221755073As for marine shales, the abundance of OM is regarded to have a positive correlation with total porosity of shale and the specific surface area, assuming with the same thermal mature (Curtis et al., 2012a; Mastalerz et al., 2012; Chen and Xiao, 2014; Fu et al., 2015).However, TOC has a negative correlation with the porosities of the lacustrine shales, due to immature or …
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