By a News Reporter-Staff News Editor at Chemicals & Chemistry -- Investigators publish new report on Alkalies. According to news reporting originating from Corvallis, Oregon, by VerticalNews correspondents, research stated, “We present sediment pore fluid and sediment solid phase results obtained during IODP Expedition 340 from seven sites located within the Grenada Basin of the southern Lesser Antilles Volcanic Arc region. These sites are generally characterized as being low in organic carbon content and rich in calcium carbonate and volcanogenic material.”

Financial supporters for this research include U.S. National Science Foundation, United States Science Support Program, US National Science Foundation, NERC.

Our news editors obtained a quote from the research from Oregon State University, “In addition to the typical reactions related to organic matter diagenesis, pore fluid chemistry indicates that the diagenetic reactions fall within two broad categories; (1) reactions related to chemical exchange with volcanogenic material and (2) reactions related to carbonate dissolution, precipitation, or recrystallization. For locations dominated by reaction with volcanogenic material, these sites exhibit increases in dissolved Ca with coeval decreases in Mg. We interpret this behavior as being driven by sediment-water exchange reactions from the alteration of volcanic material that is dispersed throughout the sediment package, which likely result in formation of Mg-rich secondary authigenic clays. In contrast to this behavior, sediment sequences that exhibit decreases in Ca, Mg, Mn, and Sr with depth suggest that carbonate precipitation is an active diagenetic process affecting solute distributions. The distributions of pore fluid Sr-87/Sr-86 reflect these competitive diagenetic reactions between volcanic material and carbonate, which are inferred by the major cation distributions. From one site where we have solid phase Sr-87/Sr-86 (site U1396), the carbonate fraction is found to be generally consistent with the contemporaneous seawater isotope values. However, the Sr-87/Sr-86 of the non-carbonate fraction ranges from 0.7074 to 0.7052, and these values likely represent a mixture of local arc volcanic sources and trans-Atlantic eolian sources. Even at this site where there is clear evidence for diagenesis of volcanogenic material, carbonate diagenesis appears to buffer pore fluid Sr-87/Sr-86 from the larger changes that might be expected given the high abundance of tephra in these sediments.”

According to the news editors, the research concluded: “Part of this carbonate buffering, at this site as well as throughout the region, derives from the fact that the Sr concentration in the non-carbonate fraction is generally low (<200 ppm), whereas the carbonate fraction has Sr concentrations approaching similar to 1000 ppm.”

For more information on this research see: Diagenesis in tephra-rich sediments from the Lesser Antilles Volcanic Arc: Pore fluid constraints. Geochimica Et Cosmochimica Acta , 2018;228():119-135. Geochimica Et Cosmochimica Acta can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier - www.elsevier.com; Geochimica Et Cosmochimica Acta - http://www.journals.elsevier.com/geochimica-et-cosmochimica-acta/)

The news editors report that additional information may be obtained by contacting J. McManus, Oregon State University, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331, United States. Additional authors for this research include N.A. Murray, M.R. Palmer, B. Haley and H. Manners.

The direct object identifier (DOI) for that additional information is: https://doi.org/10.1016/j.gca.2018.02.039. This DOI is a link to an online electronic document that is either free or for purchase, and can be your direct source for a journal article and its citation.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2018, NewsRx LLC

CITATION: (2018-04-27), Researchers from Oregon State University Provide Details of New Studies and Findings in the Area of Alkalies (Diagenesis in tephra-rich sediments from the Lesser Antilles Volcanic Arc: Pore fluid constraints), Chemicals & Chemistry, 4125, ISSN: 1944-1525, BUTTER® ID: 015565889

From the newsletter Chemicals & Chemistry.
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