Chemical and mineralogical changes during basalt-seawater interaction; Site 223, Leg 23, D.S.D.P., North-west Indian Ocean

Author(s): Papavassiliou, C. J.; Cosgrove, M. E.
Author Affiliation(s): Primary:
Univ., Dep. Geol., Southampton SO9 5NH, United Kingdom
Volume Title: Mineralogical Magazine
Source: Mineralogical Magazine, Vol.44, p.141-146. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X CODEN: MNLMBB
Note: In English. 18 refs.; illus. incl. 5 tables
Summary: The development of low- and hightemperature alteration products in a 23 m section of ocean-floor basalts is described. Analcime, calcite and dioctahedral smectite are ubiquitous. Trioctahedral smectite, smectite-chlorite mixed layers, chabazite and scolecite occur in the deeper sections with Fe3+ oxides/hydroxides progressively becoming more abundant in the upper regions. The upper layers of the sequence show marked chemical reduction. High-temperature chemical changes include Na and Mg enrichment accompanied by Ca and Fe2+ losses. Superimposed low temperature changes include gains in Fe3+ K, Li, and Rb, and losses in Na, Ca, and Fe2+ Many trace elements also show consistent behaviour.
Year of Publication: 1981
Research Program: DSDP Deep Sea Drilling Project
Key Words: 05 Petrology, Igneous and Metamorphic; 07 Marine Geology and Oceanography; Alteration; Arabian Sea; Areal studies; Basalts; Clay mineralogy; Clay minerals; DSDP Site 223; Deep Sea Drilling Project; Geochemistry; Igneous rocks; Indian Ocean; Leg 23; Major elements; Oceanic basalt; Oceanography; Sea water; Secondary minerals; Sheet silicates; Silicates; Smectite; Trace elements; Volcanic rocks; Zeolite
Coordinates: N184458 N184459 E0600747 E0600746
Record ID: 1982059001
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France