Composition and Genesis of Zeolitic Claystones from the Central Indian Ocean Basin

作     者：Sridhar D.Iyer M.Sudhakar P.Das 

作者机构：National Institute of OceanographyDona Paula Goa 403004India National Centre for Antarctic:and Ocean ResearchSada HeadlandVasco-da-Gama Goa403804India 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2007年第81卷第5期

页      面：756-770页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

主　　题：halmyrolysis zeolites alteration authigenesis Indian Ocean 

摘      要：We examined more than fifty indurated sediments recovered from the Central Indian Ocean Basin （CIOB） during the course of collection for manganese nodules and crusts. The samples occur as slabs either over which ferromanganese oxides are present or over a substrate of altered oceanic basalt in conjunction with palagonite or within the nucleus of manganese nodules. Mineralogically and compositionally, the samples show a mixture of phillipsite, palagonite and montmorillonite. We suggest that the volcanogenic precursors occurring in the CIOB were subjected to varying degrees of alteration under the influence of low temperature conditions, resulting in the formation of zeolitic claystones. The CIOB samples have similarities to those reported from various sites in the world oceans.