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Liu, Zhifei; Colin, Christophe; Huang, Wei; Le, Khanh Phon; Tong, Shengqi; Chen, Zhong; Trentesaux, Alain. |
Results of clay mineralogy, major element geochemistry, and Sr and Nd isotopes in 93 argillaceous samples collected from drainage basins of the Pearl, Red, and Mekong rivers reveal different degrees of chemical weathering in Southeast Asia despite similar climate conditions across these regions. The kaolinite/illite ratio, illite chemistry index, and illite crystallinity can be used as indicators of chemical weathering intensity. These mineralogical proxies combined with the K(2)O/(Na(2)O + CaO) molar ratio, chemical index of alteration (CIA), and weathering trends observed from major element results indicate intensive silicate weathering in the Pearl River basin, moderate to intensive in the Mekong River basin, and moderate in the Red River basin.... |
Tipo: Text |
Palavras-chave: Clay minerals; Major elements; Chemical weathering; Pearl River; Red River; Mekong River. |
Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00235/34613/32949.pdf |
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Govin, Aline; Holzwarth, Ulrike; Heslop, David; Keeling, Lara Ford; Zabel, Matthias; Mulitza, Stefan; Collins, James A.; Chiessi, Cristiano M.. |
Numerous studies use major element concentrations measured on continental margin sediments to reconstruct terrestrial climate variations. The choice and interpretation of climate proxies however differ from site to site. Here we map the concentrations of major elements (Ca, Fe, Al, Si, Ti, K) in Atlantic surface sediments (36 degrees N-49 degrees S) to assess the factors influencing the geochemistry of Atlantic hemipelagic sediments and the potential of elemental ratios to reconstruct different terrestrial climate regimes. High concentrations of terrigenous elements and low Ca concentrations along the African and South American margins reflect the dominance of terrigenous input in these regions. Single element concentrations and elemental ratios including... |
Tipo: Text |
Palavras-chave: Atlantic surface sediments; Terrigenous input; Major elements. |
Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00214/32550/31035.pdf |
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Colin, C; Turpin, L; Blamart, D; Frank, N; Kissel, C; Duchamp, S. |
A high-resolution study of mineralogy and major element geochemistry combined with Sr and Nd isotopes has been conducted on high sedimentation rate cores collected off the Irrawaddy River mouth in the Andaman Sea and the Bay of Bengal to reconstruct the erosional and weathering history of the Irrawaddy River basin. In both cores, epsilon Nd(0) values imply that both glacial and interglacial sediments share a common crustal source: the Irrawaddy River. Strong glacial/interglacial cycles are recorded by Sr-87/Sr-86: interglacial periods yield values between 0.713 and 0.717, whereas glacial periods show higher values between 0.717 and 0.719. Variations of the pedogenic clays (smectite and kaolinite) to primary mineral (feldspar, quartz, illite, and chlorite)... |
Tipo: Text |
Palavras-chave: Sr and Nd isotopes; Major elements; Erosional history; Indo-Burman Ranges; Irrawaddy River. |
Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00235/34579/33111.pdf |
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HERMAN-LARA,Erasmo; BOLÍVAR-MORENO,Daniel; TOLEDO-LOPEZ,Víctor Manuel; CUEVAS-GLORY,Luis Fernando; LOPE-NAVARRETE,Mariela Carolina; BARRON-ZAMBRANO,Jesús Alberto; DÍAZ-RIVERA,Pablo; RAMÍREZ-RIVERA,Emmanuel de Jesús. |
Abstract The objective of this study was to perform a profile of mineral elements and the relationship of those as markers of geographical origin of artisanal goat cheese from the State of Veracruz, Mexico. In fresh and mature goat cheeses the quantified elements were: heavy (aluminum, arsenic, cadmium, lead), major (calcium, potassium, sodium, magnesium), essential (cobalt, chromium, copper, iron, manganese, selenium, zinc), and others (nickel and strontium). The database using variance analyses and discriminant function analysis was analyzed. Differences (P < 0.05) were found in the contents of elements between fresh and mature cheeses. The content of major, essential and other elements were similar to the results from other investigations. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Artisanal goat cheeses; Essential elements; Heavy metals; Major elements; Plasma atomic emission spectroscopy. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000600517 |
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Andrieux-loyer, Françoise; Aminot, Alain. |
Phosphorus forms with respect to sediment characteristics, such as grain-size, and major chemical elements, were studied in French coastal marine areas (the Bay of Seine and the Loire and Gironde Estuaries).In the three areas, Fe/Al-bound phosphate (Fe/Al-P) and exchangeable phosphate (exch-P) were significantly related to the proportion of fine fraction (< 63 mum). The special association of these forms with fine particles, as well as the relationships between exch-P, Fe/Al-P and Fe showed that adsorption processes on Fe oxides had taken place. However, for similar Fe concentrations, Bay of Seine sediments showed Fe/Al-P concentrations which were four to five times higher than those found in the Loire and Gironde Estuaries. This was attributed to... |
Tipo: Text |
Palavras-chave: Coastal areas; Major elements; Phosphorus forms; Grain size; Sediments. |
Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-469.pdf |
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Wu, Jiawang; Filippidi, Amalia; Davies, Gareth R.; De Lange, Gert J.. |
Organic-rich sapropel sediments were repeatedly deposited in the eastern Mediterranean Sea (EMS), in response to insolation-driven freshwater forcing. However, the exact freshwater sources and causal associated paleoclimate-related processes remain unresolved. Sapropel S5, formed during the insolation maximum of the last interglacial, is one of the most intensely developed sapropels of the Late-Quaternary. Here, detrital sediments of sapropel S5 obtained from 8 cores, together with 13 EMS surface samples, are analyzed for major elements, rare earth elements, and Sr and Nd isotopes. This permits a basin-wide investigation of the source and distribution of river-borne material to the EMS for sapropel S5, and its comparison to the present-day and the Holocene... |
Tipo: Text |
Palavras-chave: Sapropel S5; Eastern Mediterranean Sea; Provenance; Radiogenic isotopes; Major elements; Rare earth elements. |
Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00435/54623/56024.pdf |
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Xu, Zhaokai; Li, Tiegang; Yu, Xinke; Li, Anchun; Tang, Zheng; Choi, Jinyong; Nan, Qingyun. |
To synthetically realize the character of major-element compositions as well as its significance for provenance and paleoenvironment recorded in core sediments of the West Philippine Sea over the last 700 ka, grain size and major elements of 221 bulk sediments, together with major-element compositions in the detrital phase of 16 typical samples, in core MD06-3047 collected from the Benham Rise were analyzed. Both discrimination plot and R-mode factor analysis indicate that vertical changes of major elements are mainly controlled by the sedimentation of nearby volcanic matter and the eolian dust input, whereas influences from marine biologic deposition and hydrothermal activity are minor. In particular, Al2O3 and K2O are representative of an eolian dust... |
Tipo: Text |
Palavras-chave: Major elements; Provenance; Eolian dust; East Asian winter monsoon; West Philippine Sea. |
Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00264/37557/36494.pdf |
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