Chemical composition and dated ages of detrital smectites in sediments at DSDP Legs 43, 48 and 50

Mineralogical, morphological and isotopic (Rb-Sr and K-Ar) determinations were made on some detrital smectites of Palaeocene and Cenomanian ages from DSDP. drillings in the Atlantic Ocean. These minerals are not inert in their depositional environment; authigenic laths grow on detrital sheets with s...

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Bibliographic Details
Main Authors: Clauer, Norbert, Giblin, Patrick, Lucas, Jacques
Format: Dataset
Language:English
Published: PANGAEA 1984
Subjects:
43-386
48-400A
50-415A
Deep Sea Drilling Project
DRILL
Drilling/drill rig
DSDP
Glomar Challenger
Leg43
Leg48
Leg50
North Atlantic/BASIN
North Atlantic/CONT RISE
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.707364
https://doi.org/10.1594/PANGAEA.707364
Description
Summary:Mineralogical, morphological and isotopic (Rb-Sr and K-Ar) determinations were made on some detrital smectites of Palaeocene and Cenomanian ages from DSDP. drillings in the Atlantic Ocean. These minerals are not inert in their depositional environment; authigenic laths grow on detrital sheets with sharp borders. This authigenesis could occur slightly after deposition in a closed system, for some of these smectites. It has been tentatively quantified by the Rb-Sr and K-Ar isotopic methods, which seem also well suited to evaluate the chemical extent of this authigenesis. At least, no preferential loss of 40Ar vs. 87Sr could be detected in the minerals, even in those which are smaller than 0.2 ?m.

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