Controls over the strontium isotope composition of river water

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doi: 10.1016/0016-7037(92)90332-D
Authors:Palmer, M. R.; Edmond, J. M.
Author Affiliations:Primary:
Univ. Bristol, Dep. Geol., Bristol, United Kingdom
Mass. Inst. Technol., United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 56(5), p.2099-2111. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1992
Note:In English. 25 refs.; illus.
Summary:Analyses are presented of elemental Sr and Sr isotopes of river samples from the Ganges, Orinoco and Amazon basins. The Sr concentration and Sr isotope composition of the river waters is defined mainly by mixing of Sr from limestones and evaporites with high Sr contents, and low 87Sr/86Sr ratios, and Sr from silicate rocks with lower Sr contents and radiogenic Sr. In most cases the Sr isotope composition of the limestone endmember lies within the Phanerozoic sea-water range leading to an effective means of buffering the Sr isotope compositions on major rivers and sea-water. Rivers draining the Himalayas, however, are affected by the enrichment in radiogenic Sr from regionally metamorphosed limestone sources. The Sr isotope systematics of rivers draining shields are controlled by the transport-limited nature of the weathering reactions. The 87Sr/86Sr ratios of this source are higher than in rivers draining limestones and evaporites. Weathering reactions in flood plains are not a major source of dissolved Sr, and precipitation of soil salts in some flood plains can reduce the riverine flux of dissolved Sr to the oceans. [R.K.H.]
Subjects:Alkaline earth metals; Controls; Geochemistry; Hydrochemistry; Hydrology; Isotopes; Metals; Sr-87/Sr-86; Stable isotopes; Strontium; Surface water; Amazon Basin; Asia; Ganges River basin; Indian Peninsula; Orinoco River basin; South America; Ratios
Abstract Numbers:92M/4505
Record ID:1992053706
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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