Interstitial-water chemistry of ODP Leg 113 sites

Variations in the distribution of major elements and stable oxygen isotopes in ODP Leg 113 pore water are not related to lithology and thus appear to be controlled by minor constituents. Petrographic observations and geochemical considerations indicate that alteration of calc-alkalic volcanic materi...

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Bibliographic Details
Main Authors: Egeberg, Per Kristian, Aagaard, Per, Smalley, P Craig
Format: Dataset
Language:English
Published: PANGAEA 1990
Subjects:
113-689B
113-690B
113-690C
113-693
113-694B
113-694C
113-695A
113-696A
113-696B
113-697A
113-697B
COMPCORE
Composite Core
DRILL
Drilling/drill rig
Joides Resolution
Leg113
Ocean Drilling Program
ODP
South Atlantic Ocean
Weddell Sea
Weddell
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.753954
https://doi.org/10.1594/PANGAEA.753954
Description
Summary:Variations in the distribution of major elements and stable oxygen isotopes in ODP Leg 113 pore water are not related to lithology and thus appear to be controlled by minor constituents. Petrographic observations and geochemical considerations indicate that alteration of calc-alkalic volcanic material dispersed in the sediment is an important process. A diagenetic reaction is constructed that involves transformation of volcanic glass into smectite, zeolite (represented by phillipsite), chert, and iron sulfide. Mass balance calculations reveal that alteration of less than 10% (volume) of volcanogenic material may account for the observed depletion of magnesium, potassium, and 18O and enrichment of calcium. Alteration of this amount of volcanic glass produces less than 4% (volume) of smectite and zeolite. Hence, mass balance is obtained without having to invoke unreasonable large amounts of volcanic matter or interactions between seawater and basement.

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