Journal ArticleDOI
Geochemistry of black shale deposits; a summary report
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Trace element analysis, correlation statistics, depositional environments, syngenetic, diagenetic, and epigenetic minor element enrichment, samples mainly from United States as discussed by the authors.Abstract:
Trace-element analysis, correlation statistics, depositional environments, syngenetic, diagenetic, and epigenetic minor element enrichment, samples mainly from United Statesread more
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Journal ArticleDOI
Application of factor analysis in the assessment of groundwater quality in a blackfoot disease area in Taiwan
TL;DR: The over-extraction of groundwater is the major cause of groundwater salinization and arsenic pollution in the coastal area of Yun-Lin, Taiwan and this model explains over 77.8% of the total groundwater quality variation.
Journal ArticleDOI
Geochemistry of Recent oxic and anoxic marine sediments: Implications for the geological record
TL;DR: In this article, the authors examined the distribution of minor and trace elements in marine sediments and provided forensic tools for determining the redox conditions of the bottom waters at the time of deposition.
Journal ArticleDOI
Trace-element behavior and redox facies in core shales of Upper Pennsylvanian Kansas-type cyclothems
Thomas J. Algeo,J. Barry Maynard +1 more
TL;DR: In this paper, the authors developed a multiproxy technique for assessing redox facies in black shale samples: euxinic conditions were considered to have existed if at least two of four trace-indicator trace elements (Mo, U, V, Zn, and Pb), and nonsulfidic anoxic conditions were inferred otherwise.
Journal ArticleDOI
Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals
M. P. Ketris,Ya. E. Yudovich +1 more
TL;DR: In this paper, the average trace element contents in the World black shales and coals and coal Clarke values are presented, based on comprehensive calculations using very large amount of information (thousands analyses of black shale, coals, and coal ashes for trace elements).
Journal ArticleDOI
Mechanism of molybdenum removal from the sea and its concentration in black shales: EXAFS evidence
George R. Helz,C.V. Miller,John M. Charnock,John M. Charnock,J. F. W. Mosselmans,Richard A. D. Pattrick,C D Garner,David J. Vaughan +7 more
TL;DR: In this article, the authors introduce the concept of a geochemical switch, in which HS- transforms the marine behavior of a conservative element to that of a particle reactive element, and the action point of the HS- switch is calculated to be, a(HS)- = 10(-3.6) - 10(-4.3).
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