The Experts below are selected from a list of 7353 Experts worldwide ranked by ideXlab platform
Lawrence A Hardie - One of the best experts on this subject based on the ideXlab platform.
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secular variation in seawater chemistry an explanation for the coupled secular variation in the mineralogies of marine limestones and Potash evaporites over the past 600 m y
Geology, 1996Co-Authors: Lawrence A HardieAbstract:Secular changes in the mineralogies of marine nonskeletal limestones and Potash evaporites occur in phase on a 100–200 m.y. time scale such that periods of “aragonite seas” are synchronized with MgSO4 evaporites and periods of “calcite seas” with KCl evaporites. It is proposed that these coupled changes are the result of secular variation in seawater chemistry controlled primarily by fluctuations in the mid-ocean ridge hydrothermal brine flux, which in turn have been driven by fluctuations in the rate of ocean crust production. Quantitative predictions based on this hypothesis yield secular variation in limestone and Potash evaporite mineralogies that closely match the observed variation over the past 600 m.y., providing strong support for the thesis that seawater chemistry, rather than remaining constant, has oscillated significantly over geologic time.
Trask, Mendeley M Data) - One of the best experts on this subject based on the ideXlab platform.
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Current Density to Protect AISI 1018 Carbon Steel in Saturated Potash Brine
2020Co-Authors: Trask, Mendeley M Data)Abstract:Average protective current density measured from galvanically protecting an AISI 1018 carbon steel pipe submerged in saturated Potash brine using magnesium over 95 minutes. The data set describes how much current is required to protect the steel from the moment it is submerged in Potash brine for a total of 95 minutes. This data can be used to estimate the average current density required to protect 1018 carbon steel in saturated Potash brine to use in design calculations for cathodic protection systems
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Protection Potential of AISI 1018 CS in Saturated Potash Brine
2020Co-Authors: Trask, Mendeley M Data)Abstract:Eprot determined at various depths through a galvanically protected AISI 1018 carbon steel pipe section submerged in saturated Potash brine. This data is used to create a profile of the potential between carbon steel and its environment while cathodically protected. From the data, the average protection potential can be estimated that is required to cathodically protect carbon steel in saturated Potash brine. The protection potential can later be used in design calculations and experiments as the polarization required for cathodic protection in this environment
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Protection Potential of AISI 1018 CS in Saturated Potash Brine
2020Co-Authors: Trask, Mendeley M Data)Abstract:Eprot determined at various depths through a galvanically protected AISI 1018 carbon steel pipe submerged in saturated Potash brine
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Current Density to Protect AISI 1018 Carbon Steel in Saturated Potash Brine
2020Co-Authors: Trask, Mendeley M Data)Abstract:Average protective current density measured from galvanically protecting an AISI 1018 carbon steel pipe submerged in saturated Potash brine using magnesium over 95 minute
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Protection Current Density Datum Measurements
2020Co-Authors: Trask, Mendeley M Data)Abstract:This data describes the list of current density datum point measurements for AISI 1018 CS found at a flow velocity of 2.5 m/s and 0 wt.% sand concentration in saturated Potash brine to ensure the comparability of data within different data sets at higher flowrates. Before experiments were performed at higher flow rates, measurements at a flow velocity of 2.5 m/s and 0 wt.% sand concentration are performed. If the current density to protect the steel elbow at this condition is the same prior to each experiment, the results of the experiments are comparable to each other. The data shown displays the datum points acquired prior to experiments performed at four different flowrates
Jiafa Luo - One of the best experts on this subject based on the ideXlab platform.
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long term Potash application and wheat straw return reduced soil potassium fixation and affected crop yields in north china
Nutrient Cycling in Agroecosystems, 2017Co-Authors: Deshui Tan, Zhaohui Liu, Lihua Jiang, Jiafa LuoAbstract:In light of China’s mineral potassium (K) deficit, it is imperative to improve K fertilizer use efficiency and conserve soil K. This study explored the effects of 15 years (1993–2007) of continuous Potash application and wheat straw return on the K fixation capacity of cultivated soils in North China. Soil was collected from a number of long-term test sites, with different rates of Potash application and wheat straw return and under different cropping systems. The results showed that long-term continuous Potash application and straw return significantly reduced soil K fixation capacity. In addition, soil K fixation increased with the K concentration of the treatment solution. Soil K fixation levels were higher under double cropping systems than for single cropping systems. Soil K fixation capacity showed a clear zonal distribution pattern across North China; the soil K fixation capacity gradually increased from west to east. When the K concentration of the treatment solution was 1000 mg L−1, the average K fixation of soils fertilized only with N and P at experimental sites from Northwest, North-central and Northeast China were 359, 443, and 469 mg kg−1, respectively. The pattern of soil K fixation capacity across the different regions of North China matched the pattern of the timing of significant yield responses to K applications in the different regions. This research suggests that there should be a requirement for straw return as well as K fertilization to optimise K supply to crops during production.
Enyinnaya Ohaeri - One of the best experts on this subject based on the ideXlab platform.
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stress corrosion cracking behavior of selected stainless steels in saturated Potash brine solution at different temperatures
Corrosion Science, 2020Co-Authors: Felipe M F Serafim, Wahab O Alabi, Ikechukwuka N A Oguocha, Akindele G. Odeshi, Richard W Evitts, Rega Gerspache, Enyinnaya OhaeriAbstract:Abstract The susceptibility of UNS S31603, UNS S32550, UNS S32760, and UNS S32205 to stress corrosion cracking (SCC) in saturated Potash brine (KCl) solution was studied using the slow strain rate testing (SSRT) method. Two strain rates (10-6 s-1 and 5 × 10-7 s-1) and three temperatures (25, 50, and 80 °C) were used. UNS S31603 steel showed significant susceptibility to SCC, the severity of which increased with temperature, while the duplex steels exhibited considerable resistance to SCC in KCl solution for all the test conditions. Examination of surfaces of failed specimens suggests a mixture of ductile and brittle fractures.
Chenglin Liu - One of the best experts on this subject based on the ideXlab platform.
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the effect of solvent chemistry on potassium dissolution extraction from low grade solid Potash ore in qarhan salt lake china
Applied Geochemistry, 2020Co-Authors: Chenglin Liu, Pengcheng Jiao, Wanping Liu, Deguo Tang, Shijun WangAbstract:Abstract Qarhan Salt Lake contains approximately 296 million tonnes of low-grade solid Potash ores. The exploitation and utilization of this low-grade solid Potash ore represents the fundamental framework for the sustainable development of Qarhan Salt Lake's Potash fertilizer industry. It also alleviates the shortage of Potash resources of China. In this paper, we studied species and characteristics of the low-grade solid Potash minerals from the Bieletan area in Qarhan Salt Lake and analyzed the solvent that affected the dissolution extraction of low-grade solid Potash ore. The major Potash minerals in the Bieletan Subbasin are polyhalite, carnallite and sylvite. An effective solvent for dissolving these Potash minerals is prepared with old bittern and water from Senie Lake, which contains average Mg2+, Cl−, K+ and Na+ values as 3.69%, 15.23%, 0.23% and 1.60%, respectively. Theoretically calculating by PHREEQC shows that the chemical composition of the solvent is nearly in equilibrium with halite and far away from equilibrium with polyhalite, carnallite and sylvite. This solvent does not significantly cause dissolution and precipitation of halite. Thus its influence on the porosity and permeability of the salt bed in the strata is minimum, which enables the solvent to flow to deeper and farther areas and dissolve more low-grade solid Potash ores, showing excellent ability to selectively dissolve K+-bearing saline minerals. After dissolution extraction experiments, the concentration of K+ in the solvent increased from 0.23% to 0.68%, showing the higher-dissolution effect of the solvent for the low-solid Potash ores. Hence, the solvent plays an important role in developing of the low-grade Potash ores.
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the mesozoic cenozoic tectonic settings paleogeography and evaporitic sedimentation of tethyan blocks within china implications for Potash formation
Ore Geology Reviews, 2018Co-Authors: Chenglin Liu, Licheng Wang, Maodu Yan, Yanjun Zhao, Yangtong Cao, Xiaomin Fang, Lijian Shen, Ting DingAbstract:Abstract Potash deposits are common in the Mesozoic-Cenozoic Tethyan domain, which features the giant Potash deposits in the Late Jurassic Central Asian Basin and the Late Cretaceous Khorat Basin of Thailand-Laos. Widespread evaporitic sequences from these intervals have been found in some marine and transitional basins within the Chinese continental blocks, such as the Yangtze, Simao and Tarim blocks, in which, only one small-scale Potash deposit had been found in the Late Cretaceous Simao Basin. These evaporites are commonly characterized by depositional cycles that are more frequent than those of other Potash basins around the world. It remains debated whether large or giant Potash deposits could be formed in Chinese blocks of Tethyan domain, and if so, what mechanism was responsible for the Potash formation. To address these issues, we comprehensively review the Meso-Cenozoic drift history and collision dynamics of these Chinese blocks and summarize the formation mechanism, depositional characteristics, and paleoclimate of the evaporite basins in these blocks. These blocks drifted from the Southern Hemisphere and collided and welded together in the beginning of the late Permian in the Northern Hemisphere. The collisions often commenced in the east and gradually spread to the west of these blocks, resulting in: (1) westward seawater retreat; (2) differential topographic uplift with high topography in the east and low topography in the west and (3) increasingly closed depositional environments in these basins. In addition, these collisions often exerted nearly N-S-oriented principal compressive stress, which resulted in nearly E-W-oriented extension. These forces induced a series of faulted-bounded subsidence belts with N-S-striking extensional sub-basins arranged in an E-W-oriented chain in these blocks. In this chain-like sub-basins system, as sea level rose and seawater flowed from west to east, the western sub-basins proximal to the open sea would have precipitated calcium carbonates and calcium sulfates, resulting in a high degree of concentration by the time the brines reached the distal end, i.e. eastern sub-basins. Ultimately, Potash minerals were commonly deposited in the easternmost sub-basins. Based on the above model of Potash formation, we predict that Potash deposits may be formed in certain sub-basins in the eastern part of these basins in Chinese Tethyan blocks, which maybe lay a theoretical foundation for China’s future exploration of Potash deposits.
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magnetostratigraphic study of the Potash bearing strata from drilling core zk2893 in the sakhon nakhon basin eastern khorat plateau
Palaeogeography Palaeoclimatology Palaeoecology, 2018Co-Authors: Dawen Zhang, Chenglin Liu, Maodu Yan, Xiaomin Fang, Yibo Yang, Tao Zhang, Jinbo Zan, Weilin Zhang, Qian YangAbstract:Abstract The Khorat Plateau holds one of the world's largest Potash deposits. Although many attempts have been made, the age of the Potash-bearing strata remains poorly determined. Here, we report a high resolution magnetostratigraphic study of a 595.4 m-deep Potash bearing borehole (ZK2893) in the southeast Sakhon Nakhon Basin in central Laos. This borehole penetrated the whole Potash-bearing Nong Boua Formation and reached the underlying sandstone beds of the Nam Noy Formation. A total of 500 (383 level) cubic paleomagnetic samples were collected. k -T curves and hysteresis loops revealed that hematite and magnetite were the main magnetic carriers and were likely of detrital origin, as indicated by microscopic and Electron Microprobe Analysis (EMPA) examinations. Progressive thermal and alternating field (AF) demagnetization isolated 229 valid characteristic remnant magnetizations (ChRMs), which showed a normal and antipodal distribution of the inclination data. Both the microscopic and EMPA examinations and inclination-only analysis suggest primary magnetizations of the ChRMs, yielding nine normal and seven reversed polarity zones. Combined with regional palynological, isotopic and sedimentologic evidence, the obtained polarity zones were best correlated to the geomagnetic polarity time scale of Gradstein et al. (2012) (GPTS2012), yielding magnetostratigraphic ages of > 63.5 Ma to ~ 92 Ma for the Potash-bearing Nong Boua Formation and ~ 85 Ma for the Potash bed in its lower salt unit.
