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Lizardite versus antigorite serpentinite: Magnetite, hydrogen, and life(?)

2010; Geological Society of America; Volume: 38; Issue: 10 Linguagem: Inglês

10.1130/g31158.1

1943-2682

Bernard W. Evans,

Paleontology and Stratigraphy of Fossils

Research Article| October 01, 2010 Lizardite versus antigorite serpentinite: Magnetite, hydrogen, and life(?) Bernard W. Evans Bernard W. Evans Department of Earth and Space Sciences, Box 351310, University of Washington, Seattle, Washington 98195-1310, USA Search for other works by this author on: GSW Google Scholar Geology (2010) 38 (10): 879–882. https://doi.org/10.1130/G31158.1 Article history received: 26 Feb 2010 rev-recd: 30 Apr 2010 accepted: 04 May 2010 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Bernard W. Evans; Lizardite versus antigorite serpentinite: Magnetite, hydrogen, and life(?). Geology 2010;; 38 (10): 879–882. doi: https://doi.org/10.1130/G31158.1 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 The serpentinization of peridotite operates according to one or the other, or a combination, of two end-member mechanisms. In low-temperature environments (50–300 °C), where lizardite is the predominant serpentine mineral, olivine is consumed by reaction with H2O but its composition (Mg#) remains unchanged. Mg-rich lizardite, magnetite, and dihydrogen gas (±brucite) are products of the reaction. At higher temperatures (400–600 °C), rates of MgFe diffusion in olivine are orders of magnitude faster, with the result that the growth of Mg-rich antigorite can be accommodated by a compositional adjustment of olivine, eliminating the need to precipitate magnetite and evolve hydrogen. This latter end-member mechanism probably best reflects the situation in the forearc mantle wedge. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.