Atomism or holism

Luye, Mou

doi:10.1080/20517483.2017.1427183

Cited by 4 publications

(5 citation statements)

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“…The potassium content in marine sediments is higher than the sodium content. The muddy sediments have a greater potassium content, and the study location is close to the Minjiang River estuary and the East China Sea. Additionally, the geological strata in the research area contain a tiny number of shellfish, such as clams, although the calcium oxide (CaO) content is very low.…”

Section: Discussionmentioning

confidence: 99%

Geochemistry of Pelites at Chengmen Area: Implications for Sediments Resource and Tectonic Environment

Ying,

Yao,

Chen

2024

ACS Omega

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Section: Discussionmentioning

confidence: 99%

Geochemistry of Pelites at Chengmen Area: Implications for Sediments Resource and Tectonic Environment

Ying,

Yao,

Chen

2024

ACS Omega

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“…Songshan spring came from granite, which is rich in these elements, for instance, Li is a typical lithophile and often enriched in mica and other silicate minerals and easy to hydrolyze. Sc has a very high partition coefficient in granites, Ti is high content in quartz, and Pb can replace K+ and Ca2+ in rock-forming minerals with isomorphism (Mou, 1999). Hence, the most likely scenario was that local stresses might create granite microcracks before the earthquake, exposing more fresh minerals to water, enhancing water-rock interaction, releasing more elements into the water column, and causing the rise response (Figure 8).…”

Section: Mechanism Analysis Of the First Group Trace Elementsmentioning

confidence: 99%

“…The pattern of falling changes in the second group elements was completely contrary to the pattern of rising changes in the first group elements. Because second group elements have large proton numbers and mass, and the elements with large mass mostly exist in minerals by the mechanism of adsorption (Mou, 1999), enhanced rock ruptures would result in the increase of the mineral surface area, and the increase of these elements adsorbed on the surface of minerals, leading to the decrease of the concentration of these elements in the water column (Figure 8). Due to the different adsorption and desorption capacity of different elements, the decline rate was inconsistent (Figure 6).…”

Section: Mechanism Analysis Of the Second Group Trace Elementsmentioning

confidence: 99%

“…These elements are closely located in the periodic table near the Ca element, indicating these elements have very similar chemical properties to Ca. According to petrology, elements of Ba, Rb, Cs, and Sr often replace Ca in the mineral with isomorphism (Mou, 1999). The solubility of Ca in water decreases with the increase in temperature; when the temperature is high in summer, these elements' concentrations decrease in the water, and when the temperature is low in winter, these elements' concentrations increase in the water.…”

Section: Mechanism Analysis Of the Third Group Trace Elementsmentioning

confidence: 99%

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Groundwater trace element changes were probably induced by the ML3.3 earthquake in Chaoyang district, Beijing

Chen,

Liu

2023

Front. Earth Sci.

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Geochemical composition changes in groundwater related to earthquakes have been documented in previous studies, and most such studies focused on the changes in major ions, hydrogen, oxygen isotopes, and geochemical gases. Changes in trace elements were suggested to be more sensitive to small earthquakes than the commonly used chemical constituents such as major ions, yet they received less attention. Beijing is located in the Zhangjiakou-Bohai seismic belt and experiences frequent occurrences of small earthquakes. In this paper, we collected groundwater samples from a hot spring in Yanqing district of Beijing weekly from August 2021 to August 2022. Each water sample contained 41 trace chemical compositions. During the sampling, an earthquake with a magnitude of ML3.3 occurred in the Chaoyang district of Beijing on 3 February 2022, so these trace elements changes were systematically monitored before and after the earthquake: Li, Sc, Ti, and Pb elements had upward changes before the earthquake, while Cu, Nb, Th, Zn, Tl, and U elements had downward changes before the earthquake. Eu (rare earth elements) had upward changes after the earthquake. At the same time, the earthquake caused no significant changes in the groundwater level in the seismic monitoring well near the Songshan spring. Such responses indicate that trace elements are likely to be more sensitive to crustal strain than groundwater level. We considered that the earthquake-induced rock cracks before or after the earthquake caused enhancing water-rock interaction and led to the migration of trace elements between the water column and rocks, which is the mechanism to explain the trace elemental changes. This study probably provides a comprehensive assessment of the sensitivity of trace element constituents to the earthquake. Furthermore, we suggest that more long-term continuous monitoring and research of trace elements in Beijing and Zhangjiakou-Bohai Fault Zone should be considered to explore the response mechanism of groundwater geochemistry to earthquakes in the future.

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“…Soil is the main place where radionuclides exist in supergene environment. The enrichment (or pollution) of U and Th usually come from the input of human factors and natural factors, the former includes nuclear test, uranium mining, phosphate fertilizer application and so on; the latter refers to the geological genesis is generally considered to be mainly due to the contribution of weathering of U and Th-rich rock such as granite, black shale and phosphorite (Leroy and Turpin, 1988;Mortvedt, 1994 In nature, in comparison with felsic rock, shale and most clastic sedimentary rock, carbonate rock are extremely poor in U and Th, and the contents of U and Th usually range form 0.n to 2 mg•kg -1 , which are obviously lower than the U abundance value of 2.5 mg•kg -1 and Th abundance value of 10.3 mg•kg -1 in the upper continental crust (Adams et al 1959; Delaney and Boyle, 1983;Wedepohl, 1995;Mou, 1999;Singh et al 2003; Guagliardi et al 2020). However, studies at home and abroad show that U and Th in the weathering pro le (soil) developed by U-and Th-poor carbonate rock are obviously enriched, and their contents are obviously higher than those in Chinese soils (U is 2.76 mg•kg -1 and Th is 11.6 mg•kg -1 ) and the world soil (U is 2.0 mg•kg -1 and Th is 9.0 mg•kg -1 ), the peak contents of U and Th even reached 18.78 mg•kg -1 and 40.65mg•kg -1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Geochemical behaviors of uranium and thorium during weathering and pedogenesis of carbonate rock: constraint from their speciation

Ma,

Zhou,

Feng

et al. 2023

Environ Sci Pollut Res

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During weathering and pedogenesis of carbonate rock with poor-Uranium (U) and Thorium (Th), U and Th present the characteristics of strong leaching (especially U) and signi cant residual enrichment, the cause of which is still unclear. A weathering pro le developed by dolomite in karst area of Guizhou province in southwest China was selected, which showed zonation characteristics of bedrock (Y), rock powder (Yf) and soil layer (T1 to T12) from the bottom to up. Through the determination of the occurrence speciation of U and Th in Y and weathering pro le, combined with mineralogical, geochemical characteristics and element mass balance calculation, the constraints of U and Th speciation on the geochemical behavior of U and Th during the weathering of carbonate rock were revealed. The results show that U and Th in Y preferentially exist in acid insoluble phase, for example, the contents of U and Th in Y are 0.90 mg•kg -1 and 0.28 mg•kg -1 respectively, while those in acid insoluble matter are 2.34 mg•kg -1 and 2.57 mg•kg -1 , respectively, but because the content of acid insoluble matter is extremely low (0.95%), the mass percentage of U and Th in the acid soluble phase in the whole rock is absolutely superior (96% and 86%, respectively). The U and Th in the acid-soluble phase of Y are mainly adsorbed on the crystal surface of carbonate minerals or existed in the cement, and the U and Th in the carbonate lattice only account for a small proportion. During the initial dissolution of Y to form the powdery rock layer (Yt), U and Th released from the surface of carbonate minerals and cements are in an alkaline environment rich in carbonate, and this part of U and Th are leaching out, resulting in strong loss of U and Th in the powdery rock layer ( the loss rates are 83% and 65% respectively). From the Yt to the overlying soil layer T1, the carbonate components are completely dissolved, and the U and Th released from the carbonate lattice show different behaviors which U is completely leached and Th tends to stay in the weathered residue. Thus, in the soil layer T1 formed by the interaction of Y (or Yt) and soil, the residual U is the inheritance of the U in the acid insoluble phase of Y; As for Th, it not only inherits the Th of acid insoluble phase of Y, but also superimposes the Th from carbonate lattice in Y. On the other hand, during the evolution process from Y to Y, and to soil layer T1, with the dissolution of carbonate, the acid insoluble phase also showed a signi cant tendency of chemical weathering. However, the U and Th in the Y acid insoluble phase are not leached with the decomposition of the acid insoluble phase, but are redistributed among the residual phases. As for the geochemical behavior of U and Th in the evolution of soil pro le (T1~T12), it is subject to the occurrence speciation of U and Th in T1 and the change of U and Th occurrence speciation with the upward direction of soil pro le. The U and Th released from the carrier minerals are mainly redistributed among the residual solid phases, which ...

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Atomism or holism

Cited by 4 publications

References 0 publications

Geochemistry of Pelites at Chengmen Area: Implications for Sediments Resource and Tectonic Environment

Geochemistry of Pelites at Chengmen Area: Implications for Sediments Resource and Tectonic Environment

Groundwater trace element changes were probably induced by the ML3.3 earthquake in Chaoyang district, Beijing

Geochemical behaviors of uranium and thorium during weathering and pedogenesis of carbonate rock: constraint from their speciation

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