Highly laminated, Holocene age, diatomaceous sediments are characteristic of the Palmer Deep, western Antarctic Peninsula (Ocean Drilling Program (ODP) Leg 178, Site 1098). From approximately 10,000 years B. P. to the present, laminations are comprised of several groups of diatoms. Chaetoceros resting spores, the dominant laminae former, result from intense spring blooms. Rhizosolenia, Proboscia, Thalassiothrix, and Corethron are common also, the consequence of summer production marked by a well-stratified water column. Each lamination represents a single productivity event, but laminations are not necessarily annual. High concentrations of a subpolar form of Eucampia antarctica, in laminations between approximately 9000 and 6700 years B. P., suggest early Holocene warmth, a consequence of southward intrusion of more subpolar waters. The glacial-interglacial transition is distinguished by pairs of laminae most likely deposited annually. Laminations with an overwhelming dominance of Chaetoceros resting spores alternate with more "terrigenous" laminae, representing alternation of intense spring blooms, with more mixed deposition during the summer. Proximity to retreating glacial ice results in the supply of silt and sand that provides a marker bed between successive blooms.

West: -65.0000 East: -64.0000 North: -64.3000 South: -65.0000

Expedition: 178

Site: 178-1098

Provider: SEDIS Publication Catalogue

Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.1029/2001PA000624 (c.f. for more detailed metadata)

Data download: application/pdf

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