Hyaloclastite and lava flows on young seamounts examined with a submersible

Abstract

Research Article| September 01, 1980 Hyaloclastite and lava flows on young seamounts examined with a submersible PETER LONSDALE; PETER LONSDALE 1University of California, San Diego, Marine Physical Laboratory of Scripps Institution of Oceanography, La Jolla, California 92093 Search for other works by this author on: GSW Google Scholar R. BATIZA R. BATIZA 2Department of Earth and Planetary Sciences and McDonnell Center for Space Sciences, Washington University, St. Louis, Missouri 63130 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1980) 91 (9): 545–554. https://doi.org/10.1130/0016-7606(1980)91<545:HALFOY>2.0.CO;2 Article history first online: 01 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 PETER LONSDALE, R. BATIZA; Hyaloclastite and lava flows on young seamounts examined with a submersible. GSA Bulletin 1980;; 91 (9): 545–554. doi: https://doi.org/10.1130/0016-7606(1980)91<545:HALFOY>2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract Four small seamounts that rise 800 to 1,200 m above the flanks of the East Pacific Rise at the Pacific-Rivera plate boundary were examined and sampled during four dives of DSV-3 Turtle. They are all volcanic cones, at least two of them with summit craters. Samples from three of the volcanos are tholeiitic basalt that chemically resembles the basalt erupted at the rise crest, although they are less fractionated. One of the cones within 15 km of the spreading axis has very young flows of sheet and pillow lava on its summit, including some en echelon pillow walls. The other seamounts, farther from the plate boundary, appear extinct and generally have more weathered lava with thicker ferromanganese crusts. They also have extensive flows of hyaloclastite that probably formed in deep-water phreatomagmatic eruptions. Typical hyaloclastite landforms are stone streams of rocks that have moved down side slopes of volcanos and been stabilized by precipitation of volcanogenic ferromanganese cements. 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.