Diagenetic behavior of barite in a coastal upwelling setting

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doi: 10.1029/2009PA001890
Author(s): Hendy, I. L.
Author Affiliation(s): Primary:
University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States
Volume Title: Paleoceanography
Source: Paleoceanography, 25(4). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 51 refs.; illus.
Summary: Multiproxy data from ODP Hole 1017E (Point Conception, California) provide an excellent opportunity to examine the behavior of barium, within a well-characterized sedimentary system. Bariumexcess is generally considered to be a productivity proxy; however, in nearshore environments, Baexcess records can be compromised by both sediment provenance and barite remobilization. For the last 60 kyr, ODP Hole 1017E exhibits significant changes both in primary productivity driven by coastal upwelling and in the sediment redox chemistry of underlying sediments. Significant barite enrichment occurs at an active diagenetic front that marks the boundary between sulfate-rich and sulfate-poor pore waters. This boundary also intersects a sediment facies change from deposition of relatively coarse-grained sediment before 35 ka to an interval of fine-grained, organic-rich sediment after (i.e., Interstadial Event 8). Changes in diffusion rates associated with the sediment facies change cause a strong but misleading correlation between a mobile zone of barite enrichment and rapid climate change. Thus, within the Baexcess record at ODP Hole 1017E is a history of redox chemistry that has corrupted the paleoproductivity record of Babiogenic.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Alkaline earth metals; Barite; Barium; Bromine; California; Carbon; Cenozoic; Chemostratigraphy; Climate change; Concentration; Continental margin; Cores; Diagenesis; East Pacific; Halogens; Iodine; Leg 167; Marine sediments; Metals; Molybdenum; North Pacific; Northeast Pacific; ODP Site 1017; Ocean Drilling Program; Organic carbon; Pacific Ocean; Paleoclimatology; Productivity; Provenance; Quaternary; Rhenium; Sediments; Southern California; Sulfates; Terrigenous materials; Trace metals; United States
Coordinates: N343205 N343205 W1210625 W1210625
Record ID: 2013034399
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States

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