(Table S1) Geochemistry for sediment core MD02-2515

DOI

A high-resolution, 55-kyr long record of chalcophile and redox-sensitive trace element accumulation (Ag, Cd, Re, Mo) from MD02-2515, western Guaymas Basin, is investigated in conjunction with patterns in stratigraphy and productivity. High opal concentrations (~58 wt. %), representing increased diatom production, coincide with laminated sediments, and dilute the concentrations of organic carbon (Corg) and metals. A similarity between opal and normalized Corg, Ag and Cd concentrations suggests delivery to the sediments by diatom export production, while patterns in normalized Re and Mo accumulation suggest a different emplacement mechanism. Although Mo enrichment in organic-rich, laminated sediments typically represents anoxic conditions at other locations, Mo (and Re) in Guaymas Basin is enriched in nonlaminated and bioturbated sediments that are representative of oxygenated conditions. Adsorption onto Fe- and/or Mn-oxyhydroxide surfaces during oxygenation inadequately explains both the Re and Mo enrichments. Thus, recently published mechanisms invoking direct Re and Mo removal from the water column and bioturbation-assisted irrigation of Re into the sediments are used to explain the counterintuitive observations in Guaymas Basin. The MD02-2515 stratigraphic and proxy records are also different from other records in the northeast Pacific in that there is little correspondence with Greenland Dansgaard-Oeschger interstadials. There is some correlation with Heinrich events, suggesting that ventilation of intermediate waters and/or reduced productivity may be important in controlling stratigraphy and trace element accumulation. The results question whether MD02-2515 records can be compared to northeast Pacific open-margin records, especially before 17 kyr BP.

Age is based on calibrated and interpolated radiocarbon ages. PI of age and corrected depth is Laetitia Pichevin (laetitia.pichevin@ed.ac.uk).

Supplement to: Chang, Alice S; Pichevin, Laetitia; Pedersen, Thomas F; Gray, Victoria; Ganeshram, Raja S (2015): New insights into productivity and redox-controlled trace element (Ag, Cd, Re, Mo) accumulation in a 55-kyr long sediment record from Guaymas Basin, Gulf of California. Paleoceanography, 30(2), 77-94

Identifier
DOI https://doi.org/10.1594/PANGAEA.841827
Related Identifier https://doi.org/10.1002/2014PA002681
Related Identifier https://doi.org/10.1002/palo.20031
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.841827
Provenance
Creator Chang, Alice S; Pichevin, Laetitia ORCID logo; Pedersen, Thomas F; Gray, Victoria; Ganeshram, Raja S
Publisher PANGAEA
Publication Year 2015
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 15516 data points
Discipline Earth System Research
Spatial Coverage (-112.074 LON, 27.483 LAT); Guaymas Basin