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Darcy's Law Expressed by chemical index

Journal of Earth Science 2000年第4期19卷 44-49页

作者： Hu Kuanrong Cao Yuqing Zhang Wenbing Hu Zhongyi Department of Hydrogeology and Engineering Geology, Changchun University of Science and Technology, Changchun 130026

The Darcy's formula expressed by chemical indexes (ion activity a and saturation index β) is derived with the aid of the kinetics of multi-mineral dissolution. The implication of the formula and the relationship between the formula and the original Darcy's law expressed by hydraulic index (hydraulic gradient, Ⅰ) are discussed here. An analytic expression is established in this paper for the determination of the residence time of groundwater by chemical indexes, whose equivalence to isotopic age is studied. The formulas are derived from the calculation of permeability coefficient (K), conductivity coefficient (T) and actual velocity of groundwater (U). Finally, this paper introduces hydrogeological chemical kinetics constant (k j) and its determination method, differential and integral equations for chemical kinetics of groundwater in three-dimensional space.

关键词： Darcy's formula chemical index ion activity saturation index.

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Geochemical Characterization of Organic Rich Black Rocks of the Niutitang Formation to Reconstruct the Paleoenvironmental Settings during Early Cambrian Period from Xiangxi Area,Western Hunan,China

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Journal of Earth Science 2023年第6期34卷 1827-1850页

作者： Rizwan Sarwar Awan Chenglin Liu Ashar Khan Khawaja Hasnain Iltaf Qibiao Zang Yuping Wu Sajjad Ali Muhammad Amar Gul College of Geosciences China University of PetroleumBeijing 102249China State Key Laboratory of Petroleum Resource and Prospecting China University of PetroleumBeijing 102249China Water and Power Development Authority Lahore 54000Pakistan School of Earth and Space Sciences University of Science and TechnologyHefei 230026China

The Niutitang Formation in the South China Block might be a source of hydrocarbon as it contains an enormous quantity of organic *** rock of the Early Cambrian Niutitang Formation is widely distributed in the Yangtze region,but detailed geochemical understanding of it is still *** research discusses the detailed geochemical characteristics of the Niutitang Formation to reconstruct the paleoenvironmental conditions,employing total organic carbon(TOC)content,major,trace,and rare earth element *** this purpose,black rock specimens of the Niutitang Formation from two outcrop sections were utilized for geochemical characterization,and the results compared with another eight sections from the South China *** average total organic carbon in these sediments is significantly higher(5.80 wt.%).In the platform region,lower quantities of TOC indicate a poor potential to produce *** the same time,significantly higher TOC is observed in the deep shelf and slope sediments,indicating a significant potential to produce *** average Ce,Eu and Y anomalies from both Longbizui and Sancha sections studied are 0.74,0.86,1.77,1.07,and 1.19,1.30,*** chemical index of alteration(CAI)throughout the Yangtze block is higher(averaging 71.32)than that of Post Archean Australian Shale(PAAS 69),indicating a moderately weathered source of the Niutitang Formation relative to *** the sediments are moderately weathered,this suggests these rocks might have been derived from felsic rocks,mainly *** normalization of REEs in the black rocks reveals a reduction of light REEs with increase in heavy REEs ***,a positive Eu anomaly,negative Ce anomaly,and a moderate Y/Ho(34.61)are clues to a hybrid depositional mechanism associated with hydrothermal action and terrigenous *** anomalies are also evidence of upwelling in the paleo-ocean and mixing of organic matter,which created anoxic bottom water

关键词： anomaly paleo-ocean paleoenvironment chemical index alteration weathering meta-somatism sediments

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chemical indexes of Paleoproterozoic sedimentary rocks from Liaohe Group,North China Craton:Implications for paleoclimate and provenance

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Global Geology 2021年第2期24卷 71-79页

作者： ZHANG Wei LI Zhuang YANG Fan PEI Fuping LIU Jin WANG Junhui WANG Zhiwei College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural ResourcesChangchun 130061China Hebei Key Laboratory of Strategic Critical Mineral Resources Hebei GEO UniversityShijiazhuang 050031China College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Regional Geology and Mineralization Hebei GEO UniversityShijiazhuang 050031China

Paleoproterozoic supracrustal materials have been widely identified in North China Craton,such as the Liaohe-,Hutuo-and Lyuliang *** Liaohe Group in the eastern part of the North China Craton is dominated by deformed and metamorphosed sedimentary and volcanic *** with that of the coeval volcanic rocks,geochemistry of the sedimentary rocks from the Liaohe Group has rarely been studied in detail,which can possibly provide information on the paleoclimate and *** authors analyzed the whole-rock and detrital zircon geochemistry of sedimentary rocks from the Liaohe Group against a uniform process and proposed their different ways of paleoweathering of the lower and upper *** is to say,although the lower and upper formations within the Liaohe Group might be derived from the similar source composition in a tectonically active setting,the paleoclimate that they experienced was not exactly the *** predominant derivations are the Paleoproterozoic granitoids and basalts within the Liaohe Group,with minor input of Archean continental *** study highlights the contributions of the Paleoproterozoic mafic sources,which has been generally overlooked in the previous researches.

关键词： Liaohe Group Paleoproterozoic chemical index paleoclimate provenance

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