Zeolite distribution in volcaniclastic deep-sea sediments from the Tonga Trench margin (SW Pacific)

Author(s): Vitali, Frédéric; Blanc, Gérard; Larqué, Philippe
Author Affiliation(s): Primary:
Institut de Géologie Strasbourg, Centre de Géochimie de la Surface, Strasbourg, France
Volume Title: Clays and Clay Minerals
Source: Clays and Clay Minerals, 43(1), p.92-104. Publisher: Clay Minerals Society, Clarkson, NY, United States. ISSN: 0009-8604 CODEN: CLCMAB
Note: In English. 42 refs.; illus., incl. 3 tables
Summary: 605 m of sediments were cored in Hole 841 of the Ocean Drilling Program (ODP) at the Tonga Trench margin. The sedimentary sequence consists mainly of Miocene vitric siltstones, vitric sandstones, and volcanic conglomerates. A major consideration for selecting this site was the presence of abundant authigenic minerals (40% to 70% of the whole rock), which consist of K-feldspars, clays, thaumasite (Ca3Si(OH)6CO3SO4, 12H2O), and zeolites. The zeolite minerals include phillipsite, clinoptilolite, analcime, mordenite, chabazite, heulandite, wairakite, and erionite. The increasing amount of analcime from 257 mbsf to 470 mbsf, and the joint occurrence of mordenite and wairakite in this zone of Miocene tufts, seems to be induced by the heat flow from a major intrusive sequence of basaltic andesite sills and dikes. This abundance of analcime in response to the thermal pulse could explain the unusual Na-depleted porewater compositions observed in ODP Hole 841.
Year of Publication: 1995
Research Program: ODP Ocean Drilling Program
Key Words: 01 Mineralogy and Crystallography; 07 Marine Geology and Oceanography; Analcime; Cenozoic; Clastic rocks; Clay minerals; Claystone; Crystal growth; Deep-sea environment; Distribution; East Pacific; Electron probe data; Framework silicates; Leg 135; Marine environment; Marine sediments; Miocene; Mordenite; Neogene; ODP Site 841; Ocean Drilling Program; Pacific Ocean; Pore water; SEM data; Sedimentary rocks; Sediments; Sheet silicates; Silicates; South Pacific; Southeast Pacific; Tertiary; Tonga Trench; Trenches; Volcaniclastics; Wairakite; X-ray diffraction data; Zeolite group
Coordinates: S232045 S232043 W1751752 W1751753
Record ID: 1995034867
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland