(Table T1) Correlations between marker beds and drill holes for ODP Leg 171B sites, supplement to: Pletsch, Thomas; Reicherter, Klaus (2001): Hole-to-hole correlation of Eocene volcanic ash layers from the Blake Nose depth transect, Leg 171B. In: Kroon, D; Norris, RD; Klaus, A (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 171B, 1-10


More than 50 discrete volcanic ash layers were recovered at the five drill sites of the Blake Nose depth transect (Leg 171B, western central Atlantic). The majority of these ash layers are intercalated with Eocene hemipelagic sediments with a pronounced frequency maximum in the upper Eocene. Several ash layers appear to be deposited from volcanic fallout with little or no indication of secondary remobilization. They provide excellent stratigraphic markers for a correlation of the Leg 171B drill sites. Other ash layers were probably redeposited from volcaniclastic-rich turbidity currents, but they still represent geologically instantaneous events that can be used in stratigraphic correlation between adjacent drill holes. Additional nonvolcanic marker beds, like the suspect late Eocene impact event layer, were included in our hole-to-hole correlations. Stratigraphic and downcore positions of marker beds were compiled and plotted against existing composite depth records that were constructed to guide high-resolution sampling. Comparison of our correlation with the spliced composite sections of each drill site reveals several minor and some major discrepancies. These may result from drilling distortion or missing sections, from the lack of unambiguous criteria for the synchronism of ash layers, or from the systematic exclusion of marker-bed data in the construction of the spliced record. Integration of both correlation approaches will help eliminate most of the observed discrepancies.

DEPTH, sediment and depth, reference is given in mbsf.

DOI https://doi.org/10.1594/PANGAEA.788231
Related Identifier https://doi.org/10.2973/odp.proc.sr.171B.123.2001
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.788231
Creator Pletsch, Thomas; Reicherter, Klaus
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2001
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 336 data points
Discipline Earth System Research
Spatial Coverage (-76.627W, 29.951S, -76.112E, 30.142N); Blake Nose, North Atlantic Ocean; Carolina Slope, North Atlantic Ocean
Temporal Coverage Begin 1997-01-13T00:00:00Z
Temporal Coverage End 1997-02-06T00:00:00Z