Portal de Periódicos da CAPES

Chemical disequilibrium during garnet growth: Monte Carlo simulations of natural crystal morphologies

2006; Geological Society of America; Volume: 34; Issue: 8 Linguagem: Inglês

10.1130/g22483.1

1943-2682

Dru E. Wilbur, Jay J. Ague,

High-pressure geophysics and materials

Research Article| August 01, 2006 Chemical disequilibrium during garnet growth: Monte Carlo simulations of natural crystal morphologies Dru E. Wilbur; Dru E. Wilbur 1Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Search for other works by this author on: GSW Google Scholar Jay J. Ague Jay J. Ague 1Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Dru E. Wilbur 1Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Jay J. Ague 1Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Publisher: Geological Society of America Received: 01 Dec 2005 Revision Received: 31 Mar 2006 Accepted: 06 Apr 2006 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2006) 34 (8): 689–692. https://doi.org/10.1130/G22483.1 Article history Received: 01 Dec 2005 Revision Received: 31 Mar 2006 Accepted: 06 Apr 2006 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Dru E. Wilbur, Jay J. Ague; Chemical disequilibrium during garnet growth: Monte Carlo simulations of natural crystal morphologies. Geology 2006;; 34 (8): 689–692. doi: https://doi.org/10.1130/G22483.1 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 Understanding mineral reaction pathways is critical for determining the pressure- temperature-composition (P-T-X) histories of mountain belts. We use Monte Carlo simulations of crystal growth morphologies to assess chemical disequilibrium during deep crustal (25–35 km) garnet crystallization (Connecticut, USA). Initial garnet growth produced crystals with poorly developed crystal faces and/or branched, dendritic forms. This growth phase occurred after equilibrium conditions for devolatilization reactions were considerably overstepped during metamorphic heating as a result of energy barriers to garnet nucleation. Mineral compositions and assemblages may have been unable to track evolving P-T-X histories during both the period of overstepping when no reaction was occurring, and when reactions began far from chemical equilibrium. Growth during the overstepped stage must therefore preserve valuable information about the kinetic history of metamorphism, and could have released considerable volatiles, leading to rock weakening and potentially hydrofracturing. The position of regional garnet isograds in the study area may have been strongly dependent on the kinetics of garnet nucleation and growth, rather than the equilibrium P-T-X conditions for garnet-forming reactions. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.