Matches in SemOpenAlex for { <https://semopenalex.org/work/W2015500192> ?p ?o ?g. }
- W2015500192 abstract "On the basis of the study of olivine‐hosted melt inclusions in a calc‐alkaline basalt from Batan Island (Philippines) we define a distinctive type of primitive, nepheline‐normative island arc magma characterized by unusually high CaO contents (up to 19.0 wt %) that cannot be simply explained by melting of the metasomatized peridotitic mantle wedge above subducting oceanic lithosphere. CaO‐rich melt inclusions with these characteristics are preserved in Fo 85–90 olivine, and compositional variations among the inclusions are interpreted to reflect mixing between melts such as those found in the most CaO‐rich inclusions (present in Fo 90 olivine) and melts similar to primitive “normal” island arc magmas (trapped in Fo 85 olivine). Compilation of primitive island arc magmas from the literature shows that whole rocks and olivine‐hosted melt inclusions with CaO contents >13 wt % are found in many arc volcanoes from all over the world in addition to Batan. These inclusions occur in lavas ranging from CaO‐rich ankaramites to basaltic andesites with low‐CaO contents (i.e., <13 wt %). The globally occurring CaO‐rich inclusions and whole rocks comprise a group that although defined on the basis of their CaO contents is compositionally distinctive when compared to island arc lavas that have lower CaO contents; for example, they have lower FeO at a given SiO 2 content than most arc lavas, and they are all nepheline normative, with normative nepheline contents positively correlated with CaO contents. Variations in CaO content and normative compositions of experimental partial melts of lherzolite related to changes of pressure, temperature, and source composition suggest that there are no conditions under which partial melting of peridotite can generate melts having CaO contents and other properties comparable to those observed for the primitive, CaO‐rich arc‐derived melts identified here. Although melting of peridotite at high pressure in the presence of CO 2 can produce CaO‐rich, silica‐poor liquids, we consider it unlikely that this is responsible for producing the CaO‐rich, silica‐undersaturated melts considered in this study because there are significant differences in nearly all other compositional characteristics between the CaO‐rich arc magmas and melts known or thought to be produced by melting of carbonated peridotite. Model major element compositions of partial melts of clinopyroxene‐rich lithologies (mantle pyroxenites, lower crustal pyroxenites, and eclogites) calculated using the MELTS algorithm suggest that the most CaO‐rich, nepheline‐normative melt inclusions and whole rocks identified here could represent intermediate to high degree (∼10–40 wt %) partial melts of pyroxenites at lower crustal to upper mantle pressures. Such a hypothesis is supported by the comparison between the trace element compositions of model pyroxenite sources of the Batan CaO‐rich melt inclusions and naturally occurring pyroxenites. The most likely source of the primitive CaO‐rich, silica‐undersaturated arc melts identified here is lower crustal and shallow upper mantle pyroxene‐rich cumulates from arc environments because these cumulates have CaO concentrations at the upper end of the range observed for mantle pyroxenites. They are therefore more likely to yield partial melts with the restricted range of remarkably high CaO contents of the most CaO‐rich inclusions and whole rocks identified here. Moreover, these cumulates often contain amphibole, which would lower their solidus temperatures relative to the anhydrous pyroxenite equivalents to values more consistent with those expected in deep crustal or shallow subarc environments." @default.
- W2015500192 created "2016-06-24" @default.
- W2015500192 creator A5026264194 @default.
- W2015500192 creator A5029378247 @default.
- W2015500192 creator A5039613093 @default.
- W2015500192 creator A5082069723 @default.
- W2015500192 date "2000-05-01" @default.
- W2015500192 modified "2023-10-15" @default.
- W2015500192 title "Primitive CaO‐rich, silica‐undersaturated melts in island arcs: Evidence for the involvement of clinopyroxene‐rich lithologies in the petrogenesis of arc magmas" @default.
- W2015500192 cites W1536900994 @default.
- W2015500192 cites W1545287913 @default.
- W2015500192 cites W1663342856 @default.
- W2015500192 cites W1963667722 @default.
- W2015500192 cites W1966706209 @default.
- W2015500192 cites W1968848349 @default.
- W2015500192 cites W1970548406 @default.
- W2015500192 cites W1972158246 @default.
- W2015500192 cites W1972899505 @default.
- W2015500192 cites W1973438572 @default.
- W2015500192 cites W1974795382 @default.
- W2015500192 cites W1974918430 @default.
- W2015500192 cites W1979683218 @default.
- W2015500192 cites W1979705656 @default.
- W2015500192 cites W1980756215 @default.
- W2015500192 cites W1980796709 @default.
- W2015500192 cites W1980932812 @default.
- W2015500192 cites W1982255582 @default.
- W2015500192 cites W1983031312 @default.
- W2015500192 cites W1986990031 @default.
- W2015500192 cites W1991185897 @default.
- W2015500192 cites W1993409945 @default.
- W2015500192 cites W1993975217 @default.
- W2015500192 cites W1995942773 @default.
- W2015500192 cites W1996154638 @default.
- W2015500192 cites W1997072900 @default.
- W2015500192 cites W1998202622 @default.
- W2015500192 cites W1998585500 @default.
- W2015500192 cites W1998707404 @default.
- W2015500192 cites W2000752806 @default.
- W2015500192 cites W2002271865 @default.
- W2015500192 cites W2003033703 @default.
- W2015500192 cites W2003764258 @default.
- W2015500192 cites W2008782416 @default.
- W2015500192 cites W2009482731 @default.
- W2015500192 cites W2010438180 @default.
- W2015500192 cites W2010987356 @default.
- W2015500192 cites W2012137232 @default.
- W2015500192 cites W2014814915 @default.
- W2015500192 cites W2019453281 @default.
- W2015500192 cites W2021105102 @default.
- W2015500192 cites W2022017333 @default.
- W2015500192 cites W2024436619 @default.
- W2015500192 cites W2024814277 @default.
- W2015500192 cites W2027581754 @default.
- W2015500192 cites W2027811290 @default.
- W2015500192 cites W2029211105 @default.
- W2015500192 cites W2029773068 @default.
- W2015500192 cites W2029974429 @default.
- W2015500192 cites W2030583593 @default.
- W2015500192 cites W2030870291 @default.
- W2015500192 cites W2031717155 @default.
- W2015500192 cites W2034670546 @default.
- W2015500192 cites W2035224483 @default.
- W2015500192 cites W2036742442 @default.
- W2015500192 cites W2037771137 @default.
- W2015500192 cites W2041931949 @default.
- W2015500192 cites W2042423268 @default.
- W2015500192 cites W2042690496 @default.
- W2015500192 cites W2042692134 @default.
- W2015500192 cites W2043466950 @default.
- W2015500192 cites W2043694977 @default.
- W2015500192 cites W2045278226 @default.
- W2015500192 cites W2048422130 @default.
- W2015500192 cites W2048457570 @default.
- W2015500192 cites W2051691003 @default.
- W2015500192 cites W2052016523 @default.
- W2015500192 cites W2052473341 @default.
- W2015500192 cites W2053483240 @default.
- W2015500192 cites W2053764931 @default.
- W2015500192 cites W2054061206 @default.
- W2015500192 cites W2057550910 @default.
- W2015500192 cites W2058000599 @default.
- W2015500192 cites W2059197455 @default.
- W2015500192 cites W2060655431 @default.
- W2015500192 cites W2062426713 @default.
- W2015500192 cites W2063071451 @default.
- W2015500192 cites W2063205632 @default.
- W2015500192 cites W2067203284 @default.
- W2015500192 cites W2070474135 @default.
- W2015500192 cites W2071583796 @default.
- W2015500192 cites W2073352243 @default.
- W2015500192 cites W2074647551 @default.
- W2015500192 cites W2075199408 @default.
- W2015500192 cites W2077071750 @default.
- W2015500192 cites W2078424797 @default.
- W2015500192 cites W2080280169 @default.
- W2015500192 cites W2081677058 @default.
- W2015500192 cites W2081958168 @default.
- W2015500192 cites W2082720699 @default.
- W2015500192 cites W2083828239 @default.