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Hydrothermally precipitated mixed-layer illite-smectite in recent massive sulfide deposits from the sea floor

1991; Geological Society of America; Volume: 19; Issue: 6 Linguagem: Inglês

10.1130/0091-7613(1991)019 2.3.co;2

1943-2682

Jeffrey C. Alt, Wei‐Teh Jiang,

Geological and Geochemical Analysis

Research Article| June 01, 1991 Hydrothermally precipitated mixed-layer illite-smectite in recent massive sulfide deposits from the sea floor Jeffrey C. Alt; Jeffrey C. Alt 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109 Search for other works by this author on: GSW Google Scholar Wei-Teh Jiang Wei-Teh Jiang 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109 Search for other works by this author on: GSW Google Scholar Author and Article Information Jeffrey C. Alt 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109 Wei-Teh Jiang 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1991) 19 (6): 570–573. https://doi.org/10.1130/0091-7613(1991)019 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jeffrey C. Alt, Wei-Teh Jiang; Hydrothermally precipitated mixed-layer illite-smectite in recent massive sulfide deposits from the sea floor. Geology 1991;; 19 (6): 570–573. doi: https://doi.org/10.1130/0091-7613(1991)019 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Mixed-layer illite-smectite (I/S) in recent massive sulfide deposits from a seamount near the East Pacific Rise has been studied by X-ray powder diffraction (XRD) and scanning and transmission electron microscopy (SEM, TEM). The I/S fills pore space between quartz and sulfides, and XRD and TEM analyses indicate that the I/S contains ∼25%-45% smectite, with R1-type ordering (ISISIS). Microprobe and analytical electron-microscope analyses indicate a rectorite-like composition, K being the dominant interlayer cation. The occurrence of the I/S within a hydrothermally precipitated sulfide deposit, the pore-filling texture, and the internal structure of the I/S are all consistent with direct precipitation from hydrothermal solutions. Direct precipitation of I/S from solution has two important implications. First, some sericite in ancient volcanogenic massive sulfide deposits may have similarly originated as hydrothermal precipitates rather than as alteration products, with implications for mobility and transport of Al. Second, direct precipitation of R1-ordered I/S from fluid implies that during diagenetic evolution of smectite to illite, the sequence of smectite → random I/S → ordered I/S → illite may not be followed. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.