(Table 1) Organic- and carbonate-carbon and extract for DSDP Leg 64 Holes


We determined the quantity, type, and maturity of organic matter in Pleistocene sediment from the Gulf of California. We analyzed extractable hydrocarbons by capillary column chromatography and combined gas chromatography/ mass spectrometry (GC/MS). We investigated kerogens by Rock-Eval pyrolysis and microscopy. Organic carbon is mostly between 1 and 2% in samples from the mouth of the Gulf (Holes 474 and 474A) and in the Guaymas Basin (Holes 478, 481, and 481A) and between 2 and 4% at the Guaymas Basin slope (Hole 479). We determined total extracts of about 10 mg/g Corg for all samples. The organic matter seems to be mostly terrigenous in Holes 474, 474A, 478, 481, and 481A, as indicated by the extractable hydrocarbons and the macefal analysis. But we believe that the large amounts of steroid and triterpenoid hydrocarbons in some samples indicate marine and bacterial biomass, which probably is finely disseminated and cannot readily be identified under the microscope. Rederived, inert organic matter is common in these holes. In Hole 479, the terrigenous contribution is less pronounced, and algal liptinites exceed terrigenous liptinites. But in all samples, perylene is the predominant aromatic hydrocarbon. Optical and chemical investigations show that the organic matter in the Gulf of California sediment is immature, despite the high heat flow and local basaltic intrusions. We could not establish a regular maturity trend with increasing depth.

Sediment depth is given in mbsf. # = sample probably is contaminated.

Supplement to: Rullkötter, Jürgen; von der Dick, Hans; Welte, Dietrich Hugo (1982): Organic petrography and extractable hydrocarbons of sediments from the Gulf of California, Deep Sea Drilling Project Leg 64. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 837-853

DOI https://doi.org/10.1594/PANGAEA.818969
Related Identifier https://doi.org/10.2973/dsdp.proc.64.128.1982
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.818969
Creator Rullkötter, Jürgen; von der Dick, Hans; Welte, Dietrich Hugo
Publisher PANGAEA
Publication Year 1982
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 220 data points
Discipline Earth System Research
Spatial Coverage (-111.625W, 22.959S, -108.978E, 27.846N); North Pacific/Gulf of California/BASIN; North Pacific/Gulf of California/CHANNEL
Temporal Coverage Begin 1978-12-02T00:00:00Z
Temporal Coverage End 1979-01-03T00:00:00Z