caa a22 4500 465791689 CHVBK 20180323112026.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00286826 doi (NATIONALLICENCE)springer-10.1007/BF00286826 Nd- and Sr-isotopic compositions of lavas from the northern Mariana and southern Volcano arcs: implications for the origin of island arc melts [Elektronische Daten] [P. Lin, R. Stern, J. Morris, S. Bloomer] Nd- and Sr-isotopic data are reported for lavas from 23 submarine and 3 subaerial volcanoes in the northern Mariana and southern Volcano arcs. Values of εNd range from +2.4 to +9.5 whereas 87Sr/86Sr ranges from 0.70319 to 0.70392; these vary systematically between and sometimes within arc segments. The Nd-and Sr-isotopic compositions fall in the field of ocean island basalt (OIB) and extend along the mantle array. Lavas from the Volcano arc, Mariana Central Island Province and the southern part of the Northern Seamount Province have εNd to +10 and 87Sr/86Sr=0.7032 to 0.7039. These are often slightly displaced toward higher 87Sr/86Sr at similar εNd. In contrast, those lavas from the northern part of the Mariana Northern Seamount Province as far north as Iwo Jima show OIB isotopic characteristics, with εNd and 87Sr/86Sr=0.7035 to 0.7039. Plots of 87Sr/86Sr and εNd versus Ba/La and (La/Yb)n support a model in which melts from the Mariana and Volcano arcs are derived by mixing of OIB-type mantle (or melts therefrom) and a metasomatized MORB-type mantle (or melts therefrom). An alternate interpretation is that anomalous trends on the plots of Nd- and Sr-isotopic composition versus incompatible-element ratios, found in some S-NSP lavas, suggest that the addition of a sedimentary component may be locally superimposed on the two-component mixing of mantle end-members. Springer-Verlag, 1990 Lin P. Center for Lithospheric Studies, University of Texas at Dallas, Box 830688, 75083-0688, Richardson, TX, USA aut Stern R. Center for Lithospheric Studies, University of Texas at Dallas, Box 830688, 75083-0688, Richardson, TX, USA aut Morris J. Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, 20015, Washington, DC, USA aut Bloomer S. Department of Geology, Boston University, 675 Commonwealth Avenue, 02215, Boston, MA, USA aut Contributions to Mineralogy and Petrology Springer-Verlag 105/4(1990-09-01), 381-392 0010-7999 105:4<381 1990 105 410 https://doi.org/10.1007/BF00286826 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00286826 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lin P. Center for Lithospheric Studies, University of Texas at Dallas, Box 830688, 75083-0688, Richardson, TX, USA aut NATIONALLICENCE 700 1- Stern R. Center for Lithospheric Studies, University of Texas at Dallas, Box 830688, 75083-0688, Richardson, TX, USA aut NATIONALLICENCE 700 1- Morris J. Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, 20015, Washington, DC, USA aut NATIONALLICENCE 700 1- Bloomer S. Department of Geology, Boston University, 675 Commonwealth Avenue, 02215, Boston, MA, USA aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 105/4(1990-09-01), 381-392 0010-7999 105:4<381 1990 105 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer