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Structure and composition of the Aleutian island arc and implications for continental crustal growth
Abstract
Research Article| July 01, 1999 Guatemala jadeitites and albitites were formed by deuterium-rich serpentinizing fluids deep within a subduction zone Craig A. Johnson; Craig A. Johnson 1U.S. Geological Survey, Box 25046, MS 963, Denver, Colorado 80225, USA Search for other works by this author on: GSW Google Scholar George E. Harlow George E. Harlow 2Department of Earth and Planetary Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Craig A. Johnson 1U.S. Geological Survey, Box 25046, MS 963, Denver, Colorado 80225, USA George E. Harlow 2Department of Earth and Planetary Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, USA Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (7): 629–632. https://doi.org/10.1130/0091-7613(1999)027<0629:GJAAWF>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 Email Permissions Search Site Citation Craig A. Johnson, George E. Harlow; Guatemala jadeitites and albitites were formed by deuterium-rich serpentinizing fluids deep within a subduction zone. Geology 1999;; 27 (7): 629–632. doi: https://doi.org/10.1130/0091-7613(1999)027<0629:GJAAWF>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 Jadeitites and albitites from the Motagua Valley, Guatemala, are high-pressure–low-temperature metasomatic rocks that occur as tectonic inclusions in serpentinite-matrix melange. Metasomatism was driven by a fluid with a δ18OH2O value of 6‰, and a δDH2O value that is high in comparison with metamorphic fluids at other high-pressure–low-temperature localities of similar grade. We infer that the fluid was originally seawater that was entrained during subduction either as mineral-bound H2O or as free pore waters. The fluid drove serpentinization reactions in ultramafic rocks, possibly leading to deuterium enrichment of H2O, prior to forming the jadeitites and albitites at a depth of 29 ± 11 km. There are isotopic and fluid-inclusion similarities to rodingites, which are Ca-rich metasomatites found at other serpentinite localities. Our results suggest that the serpentinization process, whether it occurs within subduction zones or on the flanks of oceanic spreading ridges, may produce residual fluids that are H2O rich, have 1–8 wt% equivalent NaCl, and have high, perhaps seawater-like, δD values. 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.
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“Anoxia proxies that have long been recognized include the lack of pre-GOE continental sediments stained by red ferric oxides (redbeds), detrital grains from well-aerated rivers of siderite (FeCO3), uraninite (UO2), or pyrite that would oxidize and dissolve or rust at high pO2 (65, 66), and paleosols with iron washed out by anoxic rainwater [e.g., (67)].”
From The Archean atmosphere (2020) · cites this paper as [65]
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“Prior to this study, animal diversification and colonization of the infaunal ecospace have been considered roughly synchronous [16].”
From Decoupling of body-plan diversification and ecological structuring during the Ediacaran–Cambrian transition: evolutionary and geobiological feedbacks (2014) · cites this paper as [16]
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“whereas geologic and geochemical constraints suggest that before ~2.45 billion years ago (Ga), the atmosphere was essentially devoid of this gas (1–4).”
From Rapid oxygenation of Earth’s atmosphere 2.33 billion years ago (2016) · cites this paper as [4]
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“In the Precambrian ocean, however, intensive macrofaunal bioturbation is believed to have been universally insignificant or absent (e.g. Droser et al., 1999; McIlroy & Logan, 1999; Seilacher, 1999; Bottjer et al., 2000; Droser et al., 2002a; Jensen, 2003; Droser et al., 2004; Jensen et al., 2005), regardless of the rates of sedimentation or Corg supply.”
From Remarkable preservation of microbial mats in Neoproterozoic siliciclastic settings: Implications for Ediacaran taphonomic models (2009) · cites this paper as Droser et al., 1999
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- Steven Holbrook, W., Lizarralde, D., McGeary, S., Bangs, N., & Diebold, J.
- Venue
- Geology
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- 1999
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