·Coal mining in North China is widely threatened by underlying Ordovician karstic limestone groundwater This study focused on the top portion of the Ordovician limestone and its water resisting properties at a mine in North China where the total thickness of the Ordovician limestone ranges between 300 and 1600 m A packer pump
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·The North China Coalfield has mainly mined from Carboniferous Permian Coal seams and the basement is an Ordovician limestone aquifer The Ordovician limestone aquifer has a wide distribution range large thickness and uneven water abundance
·The groundwater system in the region is subdivided into four aquifers from shallow to deep Quaternary aquifer coal bearing aquifer referred to as the Meixi aquifer in a previous study by Gui and Chen the Taiyuan Fm Aquifer and the Ordovician limestone aquifer [17] The characteristics of each of these aquifers is synthesized according to Gui
·Zhangye Danxia Landform also known as Zhangye Danxia Geological Park or Rainbow Mountains is a stunning geological wonder located in the province of Gansu China It is renowned for its unique and vibrant rock formations which display a magnificent array of colors resembling a vivid palette of a painter s masterpiece
·China s coal measure gas resources are extensively distributed in several provinces autonomous regions such as Shanxi Inner Mongolia and sandstone limestone and coal seam interlayer are
·A microcrystalline limestone block and a fine sandstone block containing a distinct bedding plane were collected from the Three Gorges Reservoir area of China The bulk densities of limestone and sandstone are 2700 and 2600 kg/m 3 respectively The two large rock blocks were processed into the tested cylindrical specimens of 50 mm in
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·TST of sequence 2 formed in a barrier lagoon system FA2 whereas HST is characterized by repetitive accumulation of interbedded limestone sandstone mudstone and coal deposited under lagoonal and tidal flat settings FA2 and FA3 TST of sequence 3 comprises FA2 and HST mainly FA4 deposited in a river dominated shallow water delta
·The limestone and yellow sandstone soil profiles from SW China were measured for chemical and Sr isotope compositions of the bulk soils and their sequential leachates labile carbonate and residue or silicate fraction aiming to characterize the parent materials of the soils to understand the soil weathering and formation processes
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·Low permeability sandstone reservoirs in China typically have more complicated geological conditions pore structures and flow characteristics as compared to medium to high permeability sandstone reservoirs Traditional geological and seepage theories and engineering methods are not applicable to the development of these low
·To better understand biogeochemical processes associated with the dynamics of soil organic matter SOM the δ 13 C and δ 15 N values were analyzed in the SOM of limestone soil developed on limestone and sandstone soil developed on sandstone as well as in dominant plant species and litter samples collected on the
PDF On Oct 1 2021 Long Bo Li and others published Dynamics of organic matter in soils formed on limestone and sandstone in the karst area in southwestern China δ 13 C and δ 15 N approaches
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·Purpose The influence of parent material on soil organic carbon SOC retention remains largely unstudied Here we aimed to reveal the role of soil parent material on SOC stocks and elucidate the underlying SOC retention patterns for soils derived from limestone quaternary red earth granite basalt and tertiary red sandstone in subtropical
·Over the past years the tight sandstone in the Upper Paleozoic strata of the Ordos Basin in China has produced large volumes of gas The main characteristics of the tight sandstone are the low porosity and permeability resulting from mechanical and chemical compaction of quartz and clay minerals Shuai et al 2013; Liu et al 2019a b
·of limestone and sandstone during thermal treatment from −30 °C to 1000 °C Yanjun Shen1 & Yang Yang1 & Gengshe Yang1 & Xin Hou1 & Wanjun Ye1 & Zhemin You2 & Jiami Xi1 Received 6 March 2017
·In terms of texture sandstone is more uneven than limestone giving you a rippled look We love sandstone with a sawn finish as it provides a very contemporary look even more than limestone in many the other hand you can get a grittier texture with a bit more slip resistance by sand blasting your sandstone
·The mineralogy micro structure geochemical mass balance and porosity of sandstone in the Nankan Grotto were analyzed to explore the weathering mechanism of typical deterioration patterns scaling and disintegration The results signify that the major elements Ca Na K Al and Si have been leached during the weathering of calcite
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