First petrologic data on young volcanic rocks of SW-Bolivia

Fernández, Andrés Cuesta; Hörmann, P. K.; Kussmaul, Siegfried; Meave, J.; Pichler, Hans; Subieta, T.

doi:10.1007/bf01167425

Cited by 38 publications

(12 citation statements)

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“…Using data from multiple centers representing a "zone" would require additional analyses and comparison of the centers. Ferná ndez et al [42], Kussmaul et al [44], Avila-Salinas [38], and Feeley [41] demonstrated that rocks with the highest K 2 O contents also have the highest 87 Sr/ 86 Sr ratios. These authors proposed that the eastward enrichments of incompatible trace elements require the involvement of some form of crustal melting or contamination.…”

Section: Discussion: Origin Of Across-arc Geochemical Variations In Tmentioning

confidence: 96%

“…Overtime, this contribution diminishes and compositions become increasingly controlled by mantle source compositions. Ferná ndez et al [42] and Kussmaul et al [44] suggested that the observed compositional trends may reflect crustal melting or contamination of more mafic magmas at increasingly shallower depths eastward. These conclusions were reached without comprehensive trace element data, which was later suggested to play key roles in modeling the mineralogies and source compositions during magma differentiation and migration [41,97,98].…”

Section: Discussion: Origin Of Across-arc Geochemical Variations In Tmentioning

confidence: 96%

“…These restrictions allow for a more focused examination relative to larger regional studies (i.e., [22,36,37]). Previous regional-scale studies of magmatism in the southern Altiplano region documented eastward increases in K 2 O and related incompatible trace elements virtually identical to across-strike geochemical trends observed at many oceanic island arcs and continental arcs constructed on thin crust [38][39][40][41][42][43][44][45]. [30,32,33,46]; stippled region illustrates distribution of Quaternary volcanic rocks.…”

Section: Introductionmentioning

confidence: 95%

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Modification of the Continental Crust by Subduction Zone Magmatism and Vice-Versa: Across-Strike Geochemical Variations of Silicic Lavas from Individual Eruptive Centers in the Andean Central Volcanic Zone

et al. 2013

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To better understand the origin of across-strike K 2 O enrichments in silicic volcanic rocks from the Andean Central Volcanic Zone, we compare geochemical data for Quaternary volcanic rocks erupted from three well-characterized composite volcanoes situated along a southeast striking transect between 21° and 22° S latitude (Aucanquilcha, Ollagüe, and Uturuncu). At a given SiO 2 content, lavas erupted with increasing distance from the arc front display systematically higher K 2 O, Rb, Th, Y, REE and HFSE contents; Rb/Sr ratios; and Sr isotopic ratios. In contrast, the lavas display systematically lower Al 2 O 3 , Na 2 O, Sr, and Ba contents; Ba/La, Ba/Zr, K/Rb, and Sr/Y ratios; Nd isotopic ratios; and more negative Eu anomalies toward the east. We suggest that silicic magmas along the arc front reflect melting of relatively young, mafic composition amphibolitic source rocks and that the mid-to deep-crust becomes increasingly older with a more felsic bulk composition in which residual mineralogies are progressively more feldspar-rich toward the east. Collectively, these data suggest the continental crust becomes strongly hybridized beneath frontal arc localities due to protracted intrusion of primary, mantle-derived basaltic OPEN ACCESSGeosciences 2013, 3 634 magmas with a diminishing effect behind the arc front because of smaller degrees of mantle partial melting and primary melt generation.

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Section: Discussion: Origin Of Across-arc Geochemical Variations In Tmentioning

confidence: 96%

Section: Discussion: Origin Of Across-arc Geochemical Variations In Tmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 95%

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Modification of the Continental Crust by Subduction Zone Magmatism and Vice-Versa: Across-Strike Geochemical Variations of Silicic Lavas from Individual Eruptive Centers in the Andean Central Volcanic Zone

et al. 2013

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“…Data of island arcs were obtained from: Dixon and BATIZA (1979); STEaI (1979);BAILEY (1981); WmTFORD and JAZEK (1979); TAeLOa (1979);TAXLOR et al (1969); GILL (1970); REA and BAKER (1980); SM [T~ et al (1980). Data of Central Andes were obtained from: SIECERS et al (1969);DOSTAL et al (1977); DERUELLE (1979);THORPE et al (1976);PALACIOS and LoeEz (1979);THORrE et al (1979);H6RMANN et al, (1978); Roo~oL et aI, (1974);FERNANDEZ et al (1973);KUSSMAUL et al, (1977); EL-HINNAWI et al (1969). e) Differences in fractional crystallization:…”

Section: 4mentioning

confidence: 99%

Difference of Ti, Zr, Y and P content in calc-alkaline andesites from island arcs and continental margin (Central Andes)

Palacios¹,

Guerra²,

Campano³

1983

Geol Rundsch

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With 1 figure ZusammenfassungTi, Zr, Y und P --bekannt als immobile Elemente w~ihrend Alterations-und Metamorphoseprozessen --werden in einer Reihe von Diagrammen dargestellt, um kalk-alkaline Andesite der Inselb6gen gegen jene von aktiven Kontinentalr~indem zu unterseheiden. Diese Methode kann als ein geeignetes Verfahren bei der Unterscheidung alter Vulkanite beider Gesteinsgruppen angesehen werden. AbstractTi, Zr, Y and P, known to be chemically immobile elements during alteration and metamorphism, have been ploted in a set of diagrams in order to discriminative between cale-alkaline andesites from island arcs and continental margin. This method may be an appropiate procedure to help in the discrimination between ancient volcanics of both groups. ResumenValores de Ti, Zr, Y y P, elementos eonocidos por su car~cter inmdvil durante la alteraci6n y el metamorfismo, se han ploteado en una de diagramas en orden a diseriminar entre andesitas calco-alcalinas de arcos de islas y margen continental (Andes Centrales). Este m6todo puede constituir una ayuda muy importante para distinguir entre lavas antiguas de ambos grupos.

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“…Location of Cachi Laguna (CAL) and the samples listed in Table 1. Fernandez et al, 1973). The lava isolated several small basins now occupied by saline lakes and playas (Risacher & Fritz, 1991).…”

mentioning

confidence: 99%