Isotope ratios of smectites, calcites and whole rocks from DSDP Legs 51 and 52, Atlantic Ocean

Delta180 and 87Sr/86Sr isotopic data from smectites, calcites, and whole rocks, together with published isotopic age determinations, alkali element concentration data and petrographic observations suggest a sequential model of ocean floor alteration. The early stage lasts about 3 m.y. and is charact...

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Bibliographic Details
Main Authors: Staudigel, Hubert, Muehlenbachs, Karlis, Richardson, Stephen H, Hart, Stanley R
Format: Dataset
Language:English
Published: PANGAEA 1981
Subjects:
51-417_Site
51-417A
52-417D
52-418A
53-418A
COMPCORE
Composite Core
Deep Sea Drilling Project
DRILL
Drilling/drill rig
DSDP
Glomar Challenger
Leg51
Leg52
Leg53
North Atlantic/CONT RISE
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.667373
https://doi.org/10.1594/PANGAEA.667373
Description
Summary:Delta180 and 87Sr/86Sr isotopic data from smectites, calcites, and whole rocks, together with published isotopic age determinations, alkali element concentration data and petrographic observations suggest a sequential model of ocean floor alteration. The early stage lasts about 3 m.y. and is characterized by palagonite and smectite formation, and solutions with a large basaltic component, increasing with temperature which varies from 15° to 80° C at DSDP site 418A. Most carbonates are deposited after this stage from solutions with a negligible basaltic Sr component and temperatures of 15° to 40° C. Water of seawater Sr and O isotopic composition is shown to percolate to at least 500 m into the basaltic basement. No evidence was found for continuing exchange of strontium or oxygen after 3 m.y.

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