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Integrating stable isotopes and factor analysis to delineate the groundwater provenance and pollution sources in the northwestern part of the Amman-Al Zarqa Basin, Jordan

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Journal of Arid Land 2023年第12期15卷 1490-1509页

作者： Mutawakil OBEIDAT Ahmad AL-AJLOUNI Eman BANI-KHALED Muheeb AWAWDEH Muna ABU-DALO Basic Sciences and Humanities Department Faculty of Science and ArtsWater Diplomacy CentreJordan University of Science and TechnologyIrbid 22110Jordan Chemistry Department Jordan University of Science and TechnologyIrbid 22110Jordan Laboratory of Applied Geoinformatics Department of Earth and Environmental SciencesYarmouk UniversityIrbid 21163Jordan

Globally,groundwater contamination by nitrate is one of the most widespread environmental problems,particularly in arid and semiarid areas,which are characterized by low amounts of rainfall and groundwater *** stable isotope composition of groundwater(δ2H-H2O andδ18O-H2O)and dissolved nitrate(δ15N-NO3–andδ18O-NO3–)and factor analysis(FA)were applied to explore groundwater provenance,pollution,and chemistry evolution in the northwestern part of the Amman-Al Zarqa Basin,*** this study,we collected 23 samples from the Lower Ajloun aquifer in 2021,including 1 sample from a groundwater well and 22 samples from *** samples were tested for electrical conductivity,total dissolved solids,pH,temperature,dissolved oxygen,the concentration of major ions(Ca2+,Mg2+,Na+,K+,HCO3–,Cl–,SO42–,and NO3–),and the stable isotope composition of groundwater and dissolved *** results revealed that groundwater in the study area is mainly Ca–Mg–HCO3 type and can be classified as fresh water,hard water,and very hard *** range and average concentration of NO3–were 3.5–230.8 and 50.9 mg/L,*** 33%of the sampling points showed NO3–levels above the maximum allowable concentration of 50.0 mg/L set by the World Health Organization(WHO)guidelines for drinking water *** values ofδ18O-H2O andδ2H-H2O showed that groundwater in the study area is part of the current water cycle,originating in the Mediterranean Sea,with significant evaporation,orographic,and amount *** values of the stable isotope composition of NO3–corresponded toδ15N-NO3–andδ18O-NO3–values produced by the nitrification process of manure or septic waste and soil NH4+.The FA performed on the hydrochemical parameters and isotope data resulted in three main factors,with Factor 1,Factor 2,and Factor 3,accounting for 50%,21%,and 11%of the total variance,*** 1 was considered human-induced factor,named"pollution factor",whereas Factor 2,named"conservative

关键词： stable isotope composition δ15N-NO3– δ18O-NO3– groundwater quality pollution sources Jordan

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Characteristics of carbonatites from the northern part of the Korean Peninsula: A perspective from distribution, geology and geochemistry

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Geoscience Frontiers 2021年第1期12卷 173-181页

作者： Jinkon Ju Yunsong Kim Mansik Gang School of Resource and Exploration Engineering Kim Chaek University of TechnologyPyongyangNorth Korea Central Survey Group of Mineral Resources PyongsongNorth Korea

The present study introduces the carbonatite in the northern part of the Korean Peninsula for the first *** exploration and development of the phosphorus-bearing carbonate rocks in the area have accumulated new geological data which gave us an opportunity to study origin of the carbonate *** conducted geological survey,geochemical analyses of trace elements and rare earth elements,and carbon and oxygen isotope analyses for the carbonatites from Ssangryong,Pungnyon,Yongyu and Puhung districts of the northern part of the Korean *** research confirms that the phosphorus-bearing carbonate rocks are carbonatite originating from the *** studied carbonatites are distributed at the junctions of ring and linear structures or around their margins and contain a greater amount of REEs,Y,and Sr than carbonate *** carbonatites in Yongyu and Puhung area show evidence that they were formed from mantle plume generated at the lower mantle and display similar fractionation characteristics to carbonatites in Barrado Itapirapua in Brazil and Kalkfeld and Ondurakorume in *** patterns of the carbonatites are typical of carbonatites and the carbon and oxygen isotope analyses demonstrate that the carbonatites were originated from *** carbonatites from the northern part of the Korean Peninsula have a great potential for sources of REE,Y,PGE(platinum group elements),copper,and gold.

关键词： Carbonatite Rare-earth elements stable isotope composition Phoscorite Platinum group elements Korean Peninsula

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Isotopic Model Estimate of Relative Contribution of Potential Water Pools to Water Uptake of Pinus sylvestris var. mongolica in Horqin Sandy Land

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Journal of Resources and Ecology 2012年第4期3卷 308-315页

作者：魏雅芬方杰赵学勇伊梅张瑞军李胜功中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室北京100101 中国科学院大学北京100094 中国科学院寒区旱区环境与工程研究所兰州73000 赤峰市林业科学研究院赤峰024000

We examined stable isotope signals of precipitation, soil water, and xylem water and ran the multi-source linear mixing model （IsoSource） to determine water uptake depths and estimate proportional contribution of possible water pools to the water use of Mongolian pine （Pinus sylvestris var. mongolica） plantation in southeast Horqin Sandy Land. We also examined variations of the water use by Mongolian pine trees before and after a heavy precipitation event. The closeness of isotopic composition between xylem water and potential water pools presented that most of water uptake by the trees occurred in the depth of below 20 cm soil （up to 80 cm in this study）. Estimate from the IsoSource model agrees well with observation, and the model yielded that over 60% of the water was derived from 20–80 cm soil layer under relatively higher soil moisture conditions, contribution from much deeper soil depth may increase when the soil in this layer became dry. The contribution from the groundwater was very low since water table was much deeper than rooting depth of the trees. Isotopic signals of xylem water of Mongolian pine trees before and after a heavy precipitation of 14.4 mm on July 13 in 2009 exhibited that the trees could sense and use recent rain-charged soil water at the upper 20 cm soil layer 36 hours after the rain, and this contribution decreased rapidly in the following 24 hours. The ability of accessing different water pools of Mongolian pine trees under various soil moisture conditions is likely a good indicator of their adaptability to dry habitats in sandy lands.

关键词： isotope model Mongolian pine plantation stable isotope composition tree water uptake sources

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