Research Article| July 01, 1997 Mono-sample Pb-Pb dating of pyrrhotite and tourmaline: Proterozoic vs. Archean intracratonic gold mineralization: Comment and Reply Jeremy P. Richards; Jeremy P. Richards 1Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom Search for other works by this author on: GSW Google Scholar Paul A. Wagner; Paul A. Wagner 2Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar Robert Frei; Robert Frei 3Gruppe Isotopengeologie, Mineralogisch-Petrographisches Institut, Universität Bern, Erlachstrasse 9a, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar Thomas Pettke Thomas Pettke 3Gruppe Isotopengeologie, Mineralogisch-Petrographisches Institut, Universität Bern, Erlachstrasse 9a, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Jeremy P. Richards 1Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom Paul A. Wagner 2Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton T6G 2E3, Canada Robert Frei 3Gruppe Isotopengeologie, Mineralogisch-Petrographisches Institut, Universität Bern, Erlachstrasse 9a, CH-3012 Bern, Switzerland Thomas Pettke 3Gruppe Isotopengeologie, Mineralogisch-Petrographisches Institut, Universität Bern, Erlachstrasse 9a, CH-3012 Bern, Switzerland Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (7): 669–671. https://doi.org/10.1130/0091-7613(1997)025<0669:MSPPDO>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Jeremy P. Richards, Paul A. Wagner, Robert Frei, Thomas Pettke; Mono-sample Pb-Pb dating of pyrrhotite and tourmaline: Proterozoic vs. Archean intracratonic gold mineralization: Comment and Reply. Geology 1997;; 25 (7): 669–671. doi: https://doi.org/10.1130/0091-7613(1997)025<0669:MSPPDO>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 No Abstract Available. 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.
At subduction zones, a number of geologic processes are caused by influx in the supra-subduction mantle wedge of fluid phases released by the subducting plates. The distribution of fluids in such settings affects the mineralogical, chemical and structural transformation of rocks and, hence, the survival of relict minerals and structures of previous events. These features can be investigated by means of field-based studies of high and ultrahigh-pressure (HP-UHP) orogenic terrains that contain mantle wedge materials tectonically sampled by the subducting plates. Here we review two examples of garnet peridotites hosted in HP-UHP continental crust, which record different P-T stories: (i) shallow spinel-facies lithospheric mantle wedge down-dragged to depth during subduction and recrystallized to garnet + amphibole assemblages due to the infiltration of crust-derived fluids (Ulten Zone garnet peridotites, Eastern Alps, Italy); (ii) transition-zone mantle upwelled and accreted to cratonic roots, and involved in subduction-zone recrystallization at 200 km depth enhanced by crustal fluids (UHP garnet peridotites, Western Gneiss Region, Norway). Our textural and petrologic study shows that the water distribution controls development of the new assemblages and the metasomatic imprints of these rocks, independently on the depth and degree of metamorphism. We conclude that mantle re-fertilization by crust-derived subduction fluids is an effective mechanism working on a 100-200 km depth range.
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