Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Waples, Douglas W; Cunningham, Robert (1985): Organic geochemistry at DSDP Leg 80 Holes. PANGAEA, https://doi.org/10.1594/PANGAEA.807923, Supplement to: Waples, DW; Cunningham, R (1985): Leg 80 shipboard organic geochemistry. In: De Graciansky, PC; Poag, CW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Gov. Printing Office), 80, 949-968, https://doi.org/10.2973/dsdp.proc.80.143.1985

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
The four sites drilled on the Irish continental margin (Goban Spur) yielded sediments ranging in age from Holocene to Barremian. Most of the sediments were deposited in well oxygenated waters, and the small amounts of organic matter they contain are highly oxidized.
During a few time intervals from the Cenomanian to earliest Turonian, however, the oxygen content of the bottom waters reached very low levels, resulting in the deposition of homogeneous or laminated black sediments containing from 0.5 to 11% total organic carbon (TOC). The original organic matter was of mixed marine and terrestrial origin. The oxidizing-reducing cycles represented by interbedded black and light sediments are probably a result of changes in both circulation and productivity. The black sediments at Sites 550, 551, and 549 were probably deposited near the lower end, middle, and upper end, respectively, of an expanded oxygen-minimum layer.
The oil and gas source potential of the laminated black sediments is very good to excellent. The organic-carbon-lean sediments deposited under oxidizing conditions have no oil or gas source potential. The thermal maturity of all sediments is low.
Project(s):
Coverage:
Median Latitude: 48.857512 * Median Longitude: -13.050737 * South-bound Latitude: 48.515200 * West-bound Longitude: -13.501500 * North-bound Latitude: 49.088200 * East-bound Longitude: -12.164000
Date/Time Start: 1981-06-10T00:00:00 * Date/Time End: 1981-07-16T00:00:00
Size:
4 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text (use the following character encoding: )