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GCR Display Cores
Site 865 is located on the summit of Allison Guyot in the western Mid-Pacific Mountains.
This site was drilled for the following goals:
Clayey limestone and wackestone
Major lithology: Parallel too wavy laminated
clayey limestone, very dark grayish brown to light gray with peloids,
foraminifers, gastropods, bivalve fragments (mostly oyster), arthopods (rare)
and volcanic clasts. Slight to moderate bioturbation throughout the core.
Organic matter particles, oxydized pyrite and dolomite are common.
The following discussion refers to Subunit IVC Sections 143-865A-80R-1 to 90R-5.
A lagoonal environment between a fringing reef and other form of barrier
and a central volcanic island is envisaged. Soil-derived material, including
smectite, was supplied from an extinct volcanic center. The climate was probably
humid, favoring terrestrial run-off and rich coastal vegetation.
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Modified on Friday, 26-Sep-2008 12:39:11 CDT.