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Chemical vertical zonality in Silicate Nickel Deposit in Gllavica, Republic of Kosovo

Journal of Geological Resource and Engineering 2014年第2期2卷 94-98页

作者： Bedri Durmishaj Sylejman Hyseni llir Alliu Department of Geology Faculty of Geosciences Public University of Mitrovice (FGT-Mitrovice) Mitrovice 40000 Republic ofKosovo Department of Earth Sciences Faculty of Geology and Mining Polytechnic University of Tirana Tirana 1001 Albania

In this paper is presented chemical vertical zonality in mineral deposit nickel silicate Gllavica that is located near to the airport of Pristina. In this study were included detailed geological research of the first phase and the second pahse in deposit. According to geological exploration is presented zonality in direction of the depth of the nickel silicate deposit. Geological exploration have appeared vertical profile by zones from the surface to the depth of the deposit. The content of nickel increases nontronite zone, according to the results shown in this prospecting zone the nickel mineralization reaches higher values in the zone nontronite - serpentinite.

关键词： vertical zonality exploration Gllavica deposit Ni-silicate Kosovo.

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Carbon isotope variations of modern soils in the eastern margin of the Tibetan Plateau and their controlling factors

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Journal of Mountain Science 2021年第4期18卷 878-890页

作者： QI Lin QIAO Yan-song LIU Zong-xiu PENG Sha-sha CHENG YU WANG Yan ZHANG Xu-jiao TIAN Ming-zhong YANG Shuai-bin BAI Wen-bin Key Laboratory of Neotectonic Movement&Geohazard Chinese Academy of Geological SciencesBeijing 100081China Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China Institute of Geological Survey of Jiangsu Province Nanjing 210018China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China

The marginal areas of the Tibetan Plateau have great vertical altitude gradient and abundant vegetation, they are therefore the ideal places for investigating the relationships among carbon isotope composition(δ^(13)C) of modern soils, vegetation and environmental factors, which would be very useful for the reconstructions of both paleovegetation and paleoclimate. In this paper, modern soil samples collected in different vegetation vertical zones along 4km elevation gradient in the eastern margin of the Tibetan Plateau were analyzed for their carbon isotope composition. The results show that the modern soils in different vegetation vertical zones show apparent difference of δ^(13)C values, which get heavier in the sequence of mixed evergreen and deciduous broad-leaved forest(-27.28‰ on average), evergreen broad-leaved forest(-27.25‰), subalpine shrub-meadow(-25.81‰), subalpine coniferous forest(-25.81‰), alpine bush-meadow(-25.16‰), and drought-enduring shrub(-24.07‰). 1800 m and 3500 m are two critical points for the δ^(13)C values with respect to altitude. Specifically, the δ^(13)C values decrease with increasing altitude below both points while increasing with increasing altitude above both points. Further analyses indicate that the declining δ^(13)C values are mainly controlled by the decreasing proportion of C4 plants with elevation and the increasing δ^(13)C values are attributed to the plant physic-morphological adaptation to the alpine environment. In the absence of drought stress, temperature is the main controlling factor for the carbon isotopic variations with altitude gradient.

关键词： Soilδ^(13)C C4 plant Altitude vertical zonality

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Origin and Distribution of Groundwater Chemical Fields of the Oilfield in the Songliao Basin,NE China

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Acta Geologica Sinica(English Edition) 2005年第5期79卷 688-696页

作者： JIN Aimin LOU Zhanghua ZHU Rong CAI Xiyuan GAO Ruiqi Department of Water Conservancy and Ocean Engineering Zhejiang University Hangzhou Zhejiang 310028 China Petrochemical Corporation Beijing 100029 Exploration Bureau CNPC Beijing 100724

There are many factors affecting the chemical characteristics of groundwater in the forming process of groundwater chemical fields, such as freshening due to meteoric water leaching downwards, freshening due to mudstone compaction and water release, concentration due to infiltration and freshening due to dehydration of clay minerals. As a result, the groundwater chemical fields are characterized by lengthwise stages and planar selectivity. The former arouses vertical chemical zonality of groundwater. Five units could be identified downwards in the Songliao basin：（1） freshening zone due to downward-leaching meteoric water, （2） concentration zone due to evaporation near the ground surface, （3） freshening zone due to mudstone compaction and water release, and concentration zone due to compaction and infiltration, （4） freshening zone due to dehydration of clay minerals, and （5） filtration-concentration zone; whereas the latter determines the planar division of groundwater chemical fields：（1） the freshening area due to meteoric water, asymmetrically on the margin of the basin, （2） the freshening area due to mudstone compaction and water release in the central part of the basin, （3） the leaky area, which is a transitional zone, and （4） leakage-evaporation area, which is a concentration zone. In the direction of centrifugal flows caused by mudstone compaction in the depression area, the mineralization degree, concentrations of Na^＋ and Cl^-, and salinity coefficient （SC） increase, while concentrations of （CO3^2- ＋HCO3^-） and SO4^2-, metamorphism coefficient （MC） and desulfuration coefficient （DSC） decrease. However, all these parameters increase in the direction of gravity-induced centripetal flows.

关键词： Songliao Basin hydrodynamic field groundwater chemical field vertical zonality planar division

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