(Table 1) Geochemistry of upper Paleocene and upper Eocene glass particles at DSDP Hole 80-549

Two ash horizons have been identified in Hole 549, one in the upper Paleocene (basal NP9), the other in the upper Eocene (NP18); both are mixed lithic crystal tuffs of rhyolitic composition. These tuffs are absent in Hole 550 owing to unconformities, but the basal Eocene (NP10) of Hole 550 includes...

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Bibliographic Details
Main Author: Knox, Robert W OB
Format: Dataset
Language:English
Published: PANGAEA 1985
Subjects:
80-549
Aluminium oxide
Calcium oxide
Deep Sea Drilling Project
DRILL
Drilling/drill rig
DSDP
DSDP/ODP/IODP sample designation
Electron microprobe (EMP)
Epoch
Glomar Challenger
Iron oxide
FeO
Leg80
Magnesium oxide
Manganese oxide
North Atlantic/SPUR
Potassium oxide
Sample code/label
Silicon dioxide
Sodium oxide
Titanium dioxide
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.807807
https://doi.org/10.1594/PANGAEA.807807
Description
Summary:Two ash horizons have been identified in Hole 549, one in the upper Paleocene (basal NP9), the other in the upper Eocene (NP18); both are mixed lithic crystal tuffs of rhyolitic composition. These tuffs are absent in Hole 550 owing to unconformities, but the basal Eocene (NP10) of Hole 550 includes a series of over 50 thin bentonite layers. Intermediate plagioclase associated with these bentonites indicates that the original ash was of basaltic to andesitic composition. The bentonites are absent in Hole 549, probably because of an unconformity, but they have been identified in Hole 401 (Leg 48, Bay of Biscay). Two of the pyroclastic phases can be matched with phases previously reported for the North Sea Basin. The bentonites of Site 550 are probably equivalent to the widespread "ash series" of northwestern Europe, which may therefore be regarded as being lower Eocene in terms of Martini's calcareous nannoplankton zonation.

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