A stepped karst unconformity as an Early Silurian rocky shoreline in Guizhou Province (South China)

1996 ◽  
Vol 121 (3-4) ◽  
pp. 115-129 ◽  
Author(s):  
Rong Jia-yu ◽  
Markes E. Johnson
Keyword(s):  
2016 ◽  
Vol 125 (5) ◽  
pp. 1061-1078 ◽  
Author(s):  
YANG LIU ◽  
JINCHUAN ZHANG ◽  
XUAN TANG ◽  
CHAO YANG ◽  
SHUAI TANG

2018 ◽  
Vol 6 (4) ◽  
pp. T819-T833 ◽  
Author(s):  
Yang Gu ◽  
Wenlong Ding ◽  
Min Yin ◽  
Ruyue Wang ◽  
Baocheng Jiao ◽  
...  

The marine shale in South China has great gas exploration potential, and exploration in the Sichuan Basin has been successful, but the degree of exploration remains low in the Guizhou Province. We used organic geochemical analyses (total organic carbon content and kerogen type), scanning electron microscopy (SEM), field emission SEM, nuclear magnetic resonance (NMR), X-ray diffraction analysis, and low-temperature [Formula: see text] and [Formula: see text] adsorption experimental methods to study the micropore types and pore structures and their effects on the methane adsorption capacity of organic-rich shales found in the Fenggang block in northern Guizhou Province. The results indicate that the microscopic surface porosity of the lower Cambrian Niutitang Formation ranges from 2.88% to 5.34%, with an average value of 3.86%. Based on nitrogen adsorption methods, the range of the average pore size distribution is 4.6–9.491 nm, with an average value of 6.68 nm. All of the samples exhibit significant unimodal distributions. The main pore size is less than 10 nm, and these pores account for most of the mesopore volume, which is generally consistent with the NMR results. The methane adsorption capacity of the shale samples gradually increases in the range of 0–8 MPa at 30°C and reaches a maximum at approximately 10 MPa. Positive correlations were found between the gas content and specific surface area, total pore volume, and micropore volume. These strong correlations indicate that the Niutitang Shale has a high specific surface area, a high pore volume, and narrow-diameter pores, demonstrating that it has a high gas adsorption capacity. The results of this study provide valuable information regarding the adsorption characteristics of marine shales and the factors that affect those characteristics.


Zootaxa ◽  
2018 ◽  
Vol 4462 (1) ◽  
pp. 100
Author(s):  
GUORU REN ◽  
MAOFA YANG ◽  
WENQIN LIANG ◽  
LIXIA XIE

Two new species of Lohmanniidae, Papillacarus (Papillacarus) retinervius sp. nov. from soil in Hainan Province, South China and Papillacarus (Papillacarus) mammilatus sp. nov. from moss and soil in Guizhou Province, Southwest China are described and illustrated. Papillacarus (P.) retinervius sp. nov. is most similar to Papillacarus (P.) polygonatus (Ermilov & Anichkin, 2011), however, it can be distinguished from the latter by the following characterstics: 20–21 pairs of additional neotrichal setae, setae d2, e2, h1, p1 shorter, as long as d1, epimeral setal formula 10-8-4-3. Papillacarus (P.) mammilatus sp. nov. is most similar to Papillacarus (P.) angulatus (Wallwork, 1962), however, it can be distinguished from the latter by the following characterstics: transverse bands S3 complete, eight pairs of subcapitular setae, epimeral setal formula 10-6-3-4. 


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