Experimental evidence for high-temperature felsic melts formed during basaltic intrusion of the deep crust

Research Article| May 01, 1997 Experimental evidence for high-temperature felsic melts formed during basaltic intrusion of the deep crust T. C. McCarthy; T. C. McCarthy 1Department of Geology, University of Georgia, Athens, Georgia 30602 Search for other works by this author on: GSW Google Scholar Alberto E. Patiño Douce Alberto E. Patiño Douce 1Department of Geology, University of Georgia, Athens, Georgia 30602 Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (5): 463–466. https://doi.org/10.1130/0091-7613(1997)025<0463:EEFHTF>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 T. C. McCarthy, Alberto E. Patiño Douce; Experimental evidence for high-temperature felsic melts formed during basaltic intrusion of the deep crust. Geology 1997;; 25 (5): 463–466. doi: https://doi.org/10.1130/0091-7613(1997)025<0463:EEFHTF>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 Basaltic intrusion into the continental crust was simulated with melting experiments on layered charges of high-alumina olivine tholeiite (HAOT) and metapelite, at 11 kbar. Rapid diffusion of CaO and Na2O into the metapelite and H2O, K2O, SiO2, and Al2O3 into the basalt resulted in spectacular changes in the phase assemblage. Garnet megacrysts crystallized profusely across the basalt layer, cumulate assemblages closely resembled rocks found in underplating localities, and glass compositions graded from dacite to rhyolite, even at temperatures as high as 1150 °C. Silicic melts can be generated during interaction of basalt with metapelite, at temperatures well above the H2O-saturated granite minimum. Calculations based on these results and comparison with natural occurrences suggest that high-temperature felsic melts with <4 wt% H2O can form and segregate at rates of ∼1 cm/yr. 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.