FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2045764404> ?p ?o ?g. }

• W2045764404 endingPage "243" @default.
• W2045764404 startingPage "218" @default.
• W2045764404 abstract "Crustal assimilation (e.g. Hildreth and Moorbath, 1988) and/or subduction erosion (e.g. Stern, 1991, Kay et al., 2005) are believed to control the geochemical variations along the northern portion of the Chilean Southern Volcanic Zone. In order to evaluate these hypotheses, we present a comprehensive geochemical data set (major and trace elements and O–Sr–Nd–Hf–Pb isotopes) from Holocene primarily olivine-bearing volcanic rocks across the arc between 34.5°S and 38.0°S, including volcanic front centers from Tinguiririca to Callaqui, the rear arc centers of Infernillo Volcanic Field, Laguna del Maule and Copahue, and extending 300 km into the backarc. We also present an equivalent data set for Chile trench sediments outboard of this profile. The volcanic arc (including volcanic front and rear arc) samples primarily range from basalt to andesite/trachyandesite, whereas the backarc rocks are low-silica alkali basalts and trachybasalts. All samples show some characteristic subduction zone trace element enrichments and depletions, but the backarc samples show the least. Backarc basalts have higher Ce/Pb, Nb/U, Nb/Zr, and Ta/Hf, and lower Ba/Nb and Ba/La, consistent with less of a slab-derived component in the backarc and, consequently, lower degrees of mantle melting. The mantle-like δ18O in olivine and plagioclase phenocrysts (volcanic arc = 4.9–5.6‰ and backarc = 5.0–5.4‰) and lack of correlation between δ18O and indices of differentiation and other isotope ratios, argue against significant crustal assimilation. Volcanic arc and backarc samples almost completely overlap in Sr and Nd isotopic composition. High precision (double-spike) Pb isotope ratios are tightly correlated, precluding significant assimilation of older sialic crust but indicating mixing between a South Atlantic Mid Ocean-Ridge Basalt (MORB) source and a slab component derived from subducted sediments and altered oceanic crust. Hf–Nd isotope ratios define separate linear arrays for the volcanic arc and backarc, neither of which trend toward subducting sediment, possibly reflecting a primarily asthenospheric mantle array for the volcanic arc and involvement of enriched Proterozoic lithospheric mantle in the backarc. We propose a quantitative mixing model between a mixed-source, slab-derived melt and a heterogeneous mantle beneath the volcanic arc. The model is consistent with local geodynamic parameters, assuming water-saturated conditions within the slab." @default.
• W2045764404 created "2016-06-24" @default.
• W2045764404 creator A5011152663 @default.
• W2045764404 creator A5014964910 @default.
• W2045764404 creator A5021053411 @default.
• W2045764404 creator A5022876929 @default.
• W2045764404 creator A5023787845 @default.
• W2045764404 creator A5025110431 @default.
• W2045764404 creator A5048206714 @default.
• W2045764404 creator A5081324044 @default.
• W2045764404 creator A5085114232 @default.
• W2045764404 date "2013-12-01" @default.
• W2045764404 modified "2023-10-14" @default.
• W2045764404 title "Across-arc geochemical variations in the Southern Volcanic Zone, Chile (34.5–38.0°S): Constraints on mantle wedge and slab input compositions" @default.
• W2045764404 cites W1489332407 @default.
• W2045764404 cites W1494860090 @default.
• W2045764404 cites W1518424961 @default.
• W2045764404 cites W1524759453 @default.
• W2045764404 cites W1552583707 @default.
• W2045764404 cites W1594409026 @default.
• W2045764404 cites W1653610895 @default.
• W2045764404 cites W1654584276 @default.
• W2045764404 cites W1654991122 @default.
• W2045764404 cites W1664761159 @default.
• W2045764404 cites W1786764801 @default.
• W2045764404 cites W1812957320 @default.
• W2045764404 cites W1821593081 @default.
• W2045764404 cites W1899171572 @default.
• W2045764404 cites W1947685651 @default.
• W2045764404 cites W1965303445 @default.
• W2045764404 cites W1965410050 @default.
• W2045764404 cites W1967016499 @default.
• W2045764404 cites W1969556320 @default.
• W2045764404 cites W1975546571 @default.
• W2045764404 cites W1976433819 @default.
• W2045764404 cites W1978158257 @default.
• W2045764404 cites W1979082610 @default.
• W2045764404 cites W1980376247 @default.
• W2045764404 cites W1980429770 @default.
• W2045764404 cites W1984383378 @default.
• W2045764404 cites W1987018401 @default.
• W2045764404 cites W1987907556 @default.
• W2045764404 cites W1990479851 @default.
• W2045764404 cites W1993880036 @default.
• W2045764404 cites W1995464473 @default.
• W2045764404 cites W1995720681 @default.
• W2045764404 cites W2000996822 @default.
• W2045764404 cites W2001360260 @default.
• W2045764404 cites W2001362502 @default.
• W2045764404 cites W2003142147 @default.
• W2045764404 cites W2003473189 @default.
• W2045764404 cites W2004973269 @default.
• W2045764404 cites W2005499559 @default.
• W2045764404 cites W2008364272 @default.
• W2045764404 cites W2009132192 @default.
• W2045764404 cites W2009776043 @default.
• W2045764404 cites W2011607179 @default.
• W2045764404 cites W2012179736 @default.
• W2045764404 cites W2014832120 @default.
• W2045764404 cites W2015173307 @default.
• W2045764404 cites W2017353146 @default.
• W2045764404 cites W2020384898 @default.
• W2045764404 cites W2022104527 @default.
• W2045764404 cites W2023320566 @default.
• W2045764404 cites W2028236043 @default.
• W2045764404 cites W2029677143 @default.
• W2045764404 cites W2030992170 @default.
• W2045764404 cites W2033096659 @default.
• W2045764404 cites W2033120385 @default.
• W2045764404 cites W2035283420 @default.
• W2045764404 cites W2036820532 @default.
• W2045764404 cites W2040613156 @default.
• W2045764404 cites W2040815956 @default.
• W2045764404 cites W2048341622 @default.
• W2045764404 cites W2051328232 @default.
• W2045764404 cites W2051584927 @default.
• W2045764404 cites W2054148437 @default.
• W2045764404 cites W2054289340 @default.
• W2045764404 cites W2055549646 @default.
• W2045764404 cites W2056245697 @default.
• W2045764404 cites W2056368446 @default.
• W2045764404 cites W2060665592 @default.
• W2045764404 cites W2064145353 @default.
• W2045764404 cites W2065489771 @default.
• W2045764404 cites W2065629370 @default.
• W2045764404 cites W2066124139 @default.
• W2045764404 cites W2069903397 @default.
• W2045764404 cites W2070259366 @default.
• W2045764404 cites W2071651757 @default.
• W2045764404 cites W2072748040 @default.
• W2045764404 cites W2074054545 @default.
• W2045764404 cites W2075627347 @default.
• W2045764404 cites W2077985074 @default.
• W2045764404 cites W2080587400 @default.
• W2045764404 cites W2081146791 @default.
• W2045764404 cites W2081249292 @default.
• W2045764404 cites W2083215688 @default.
• W2045764404 cites W2085831119 @default.

• next