Results 271 to 280 of about 55,254 (299)
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Science in China Series D: Earth Sciences, 1998
Major and trace element analyses of the Luochuan loess-paleosol sequence in China were performed in order to understand the cheniical weathering processes occurring on the I.oess Plateau during the last 600 ka. Results reveal that most elements in the loess remain immobile durlng chemical weathering.
Chen Jun, Ji Junfeng, Qiu Gang, Lu Huayu
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Major and trace element analyses of the Luochuan loess-paleosol sequence in China were performed in order to understand the cheniical weathering processes occurring on the I.oess Plateau during the last 600 ka. Results reveal that most elements in the loess remain immobile durlng chemical weathering.
Chen Jun, Ji Junfeng, Qiu Gang, Lu Huayu
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Quaternary Science Reviews, 2010
Abstract Major element chemical analyses of the Baishui loess–red clay sequence (35° 24′ 10″N, 106° 54′ 43″E, Gansu Province, China) reveal that, the chemical weathering intensities inferred from CIA (chemical index of alteration) values have progressively weakened and increased in amplitude with decreasing age.
Shangfa Xiong +4 more
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Abstract Major element chemical analyses of the Baishui loess–red clay sequence (35° 24′ 10″N, 106° 54′ 43″E, Gansu Province, China) reveal that, the chemical weathering intensities inferred from CIA (chemical index of alteration) values have progressively weakened and increased in amplitude with decreasing age.
Shangfa Xiong +4 more
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Geoderma, 2021
Abstract Widely distributed Quaternary red soils (QRSs) in southern China represent the product of intense chemical weathering under a warm and humid climate. Soil containing plinthite is an important part of China’s QRSs, yet the soil environment and mechanism of formation of QRS with plinthite have been insufficiently studied. By comparing iron and
Lulu Zhao +6 more
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Abstract Widely distributed Quaternary red soils (QRSs) in southern China represent the product of intense chemical weathering under a warm and humid climate. Soil containing plinthite is an important part of China’s QRSs, yet the soil environment and mechanism of formation of QRS with plinthite have been insufficiently studied. By comparing iron and
Lulu Zhao +6 more
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Chemical Geology, 1986
Abstract Upper Pleistocene muds of the Amazon deep-sea fan contain an abundance of residual weathering products, as indicated by their bulk chemical and mineralogical compositions. The muds are chemically more mature than average shale, average pelagic mud, or the surrounding Demerara Abyssal sediments.
B.I. Kronberg, H.W. Nesbitt, W.W. Lam
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Abstract Upper Pleistocene muds of the Amazon deep-sea fan contain an abundance of residual weathering products, as indicated by their bulk chemical and mineralogical compositions. The muds are chemically more mature than average shale, average pelagic mud, or the surrounding Demerara Abyssal sediments.
B.I. Kronberg, H.W. Nesbitt, W.W. Lam
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Chemical weathering intensity of the Late Cenozoic “Red Clay” deposits in the Carpathian Basin
Geochemistry International, 2007INTRODUCTIONVery little work had been previously done on thistopic in Hungary. In the past decade, little attention hasbeen paid to the red clay in the Carpathian Basin. Dif-ferent views on the formation, properties, and distribu-tion of red clays have been published by severalauthors. Many geologists draw parallels between redclays and bauxites [1–3].
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Chemical Geology, 2015
Abstract A geochemical study of major-trace elements in detrital sediment and carbon–oxygen isotopes in carbonate was carried out for a marine stratigraphic profile of Early Triassic that is composed of argillaceous limestone and calcareous mudstone in the Lower Yangtze basin, South China. The results place constraints on the geochemical behaviors of
Ming-Yu Zhao, Yong-Fei Zheng
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Abstract A geochemical study of major-trace elements in detrital sediment and carbon–oxygen isotopes in carbonate was carried out for a marine stratigraphic profile of Early Triassic that is composed of argillaceous limestone and calcareous mudstone in the Lower Yangtze basin, South China. The results place constraints on the geochemical behaviors of
Ming-Yu Zhao, Yong-Fei Zheng
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2021
The study discusses the relationship between the intensity of weathering and trace metals concentrations in soil horizons. Weathering intensity was calculated with indices such as Ruxton ration (RR), chemical index of alteration (CIA), chemical index of weathering (CIW), plagioclase index of alteration (PIA), volgt weathering indices (V) and weathering
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The study discusses the relationship between the intensity of weathering and trace metals concentrations in soil horizons. Weathering intensity was calculated with indices such as Ruxton ration (RR), chemical index of alteration (CIA), chemical index of weathering (CIW), plagioclase index of alteration (PIA), volgt weathering indices (V) and weathering
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2017
Agricultural pollution is a matter of political and scientific concern throughout the world. Intensive agriculturecan cause nutrient contamination of groundwater and surface water. Nutrient pollution causes eutrophicationin freshwater and estuarine ecosystems.
Aquilina, Luc +9 more
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Agricultural pollution is a matter of political and scientific concern throughout the world. Intensive agriculturecan cause nutrient contamination of groundwater and surface water. Nutrient pollution causes eutrophicationin freshwater and estuarine ecosystems.
Aquilina, Luc +9 more
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Environmental Earth Sciences, 2016
To explore the chemical weathering processes and the anthropogenic disturbance of weathering, 20 water samples were collected from the tributaries in the Nansihu Lake basin, a growing industrial area. The major ions in river waters were analyzed to identify and quantify the contributions of the different reservoirs. Based on stoichiometric analyses and
Jun Li +6 more
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To explore the chemical weathering processes and the anthropogenic disturbance of weathering, 20 water samples were collected from the tributaries in the Nansihu Lake basin, a growing industrial area. The major ions in river waters were analyzed to identify and quantify the contributions of the different reservoirs. Based on stoichiometric analyses and
Jun Li +6 more
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Paleoceanography and Paleoclimatology
AbstractThe relationship between catchment silicate weathering and short‐term (<104 yrs) variations in the Indian summer monsoon (ISM) remains a topic of debate. To investigate this link, we present a comprehensive analysis of lithium isotopic composition (δ7Li), neodymium isotopic composition (εNd), and chemical index of alteration (CIA) in the ...
Jingrui Li +10 more
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AbstractThe relationship between catchment silicate weathering and short‐term (<104 yrs) variations in the Indian summer monsoon (ISM) remains a topic of debate. To investigate this link, we present a comprehensive analysis of lithium isotopic composition (δ7Li), neodymium isotopic composition (εNd), and chemical index of alteration (CIA) in the ...
Jingrui Li +10 more
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