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• W2077684298 abstract "Research Article| June 01, 2002 Slab-derived fluids and quartz-vein formation in an accretionary prism, Otago Schist, New Zealand Christopher M. Breeding; Christopher M. Breeding 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 Geology (2002) 30 (6): 499–502. https://doi.org/10.1130/0091-7613(2002)030<0499:SDFAQV>2.0.CO;2 Article history received: 06 Dec 2001 rev-recd: 11 Feb 2002 accepted: 13 Feb 2002 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 Christopher M. Breeding, Jay J. Ague; Slab-derived fluids and quartz-vein formation in an accretionary prism, Otago Schist, New Zealand. Geology 2002;; 30 (6): 499–502. doi: https://doi.org/10.1130/0091-7613(2002)030<0499:SDFAQV>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 SocietyGeology Search Advanced Search Abstract Regional quartz-vein formation and the fluxes, flow paths, and sources of metamorphic fluids were investigated in the Mesozoic accretionary prism of New Zealand by using a new chemical mass-balance analysis of outcrops. Samples were collected at meter or submeter intervals along outcrop-length traverses and combined to obtain average chemical compositions of whole outcrops. Mass-balance analysis used Zr as an immobile reference frame and as a monitor of sedimentary sorting processes. SiO2-Zr systematics produced by sedimentary processes differ greatly from those caused by metasomatic mass transfer of silica, allowing evaluation of vein-formation mechanisms. Relatively undeformed metasedimentary outcrops of low metamorphic grade (mostly prehnite-pumpellyite facies) are nearly unveined and characterized by sedimentary compositional trends. More deformed outcrops of higher metamorphic grade (mostly greenschist facies) contain 10–30 vol% quartz veins. These outcrops underwent mass addition of externally derived silica into quartz veins, accompanied by addition of Na and removal of K and W. Average silica additions suggest a time-integrated fluid flux of ∼104–105 (m^{3}_{(fluid)}) / (m^{2}_{(rock)}) for fluids ascending through the prism. Dehydration of spilitized oceanic crust subducting beneath the prism is the most probable source for this large fluid flux and could also have caused the Na-K metasomatism. The W removed from deep levels of the prism may have been deposited in focused, retrograde Au-W-quartz veins at shallow levels by ascending fluids. Transfer of SiO2 from subducting slabs into accretionary prisms is a plausible mechanism for long-term bulk silica enrichment of the continents beyond that possible by magmatic differentiation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2077684298 title "Slab-derived fluids and quartz-vein formation in an accretionary prism, Otago Schist, New Zealand" @default.
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