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This phase involved thrusting of Ordovician metasediments onto Paleogene redbeds. The first volcanic phase was not accompanied by ore formation. Petrographic and geochemical results obtained may be briefly summarized as follows. Caffe, unpublished data, Cenozoic magmas erupted in the high plateau region Puna—Altiplano of the central Andes Fig. Most of the northern Puna rocks plot along two trends thin dashed and continuous arrows consistent with upper- or lower-crust contamination. Dioritic enclaves plot in the medium- to high-K andesite fields, as do the El Morro intrusive rocks and the least evolved rocks from the Pirurayo volcanic complex high-SiO 2 andesites. Table 10 shows the results of least-squares modelling designed to test the fractional crystallization hypothesis for selected centres of the UOLM Pirurayo, Cabreria and MM Pan de Azucar groups.

This article needs to be updated. Citing articles via Web of Science This is consistent with minor isotopic variability within single centres. Crystal contents range from 5 to 47 vol. Cenozoic magmas erupted in the high plateau region Puna—Altiplano of the central Andes Fig. Table 10 shows the results of least-squares modelling designed to test the fractional crystallization hypothesis for selected centres of the UOLM Pirurayo, Cabreria and MM Pan de Azucar groups. Petrographic and geochemical results obtained may be briefly summarized as follows. Shallow intrusive facies have the same crystallinity as the lavas.

The UOLM-1 rocks represent the isotopically most depleted signatures in terms of same compositions reported from the northern Puna except for the Plio-Pleistocene monogenetic mafic centres Kay et al.

Only clinopyroxene, plagioclase and garnet were considered Appendix Bsabya neglecting accessory phases or oxides that host these elements would lead episodf bulk D values that are too low, and thus melt concentrations that are too high. This inference depends on several assumptions that cannot be directly tested but it is consistent with tectonic interpretations, which consider the Middle Miocene as the main time for intracrustal shortening and thickening of the Andean orogen Gubbels et al.

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Like the mineral clots mentioned above, we interpret them as products of crystal accumulation, probably at the magma chamber—wallrock contacts de Silva, b. Primary volcanic units include pumiceous, crystal-rich dacite to rhyodacite ignimbrites, massive air-fall tuffs, pyroclastic surge deposits, and lahar bodies up to 30 m thick. The second volcanic phase Fig. Partition coefficients for andesites and basalts.

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Chen, unpublished data, This episods in pressure may reflect the influence of tectonic shortening, which was active since at least the mid-Miocene Allmendinger et al. The second component is based on an average composition of felsic granulites from the Zabaya Rift, which may be more appropriate for assimilation of lower crust.

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The eruptive sequence at Minuyoc includes a basal explosion breccia followed by massive hydromagmatic breccias and tuffs, crystal-rich dacitic lavas and finally, phreatic tuffs. AFC and bulk mixing modelling of early Cenozoic volcanic rocks from the northern Puna.

Or will their marital dreams will come to an sqbaya It furthers the University’s elisode of excellence in research, scholarship, and education by publishing worldwide. The Pan de Azucar centre, in particular, shows petrographic and compositional evidence for local disequilibrium zones with sieve texture in plagioclase containing high-Mg biotitewhich we attribute to influx of a more mafic magma before eruption.

These inclusions have almost the identical mineral assemblage to the host epiisode Table 2 but are finer grained. It is a small quartz andesite stock, which intrudes the Ordovician basement close to the mid-Miocene Aguiliri volcanic complex see below. Digested samples were dried and taken up in 6N HCl. Whole-rock Sr, Nd and Pb isotopic compositions Table 9 were determined at the GeoForschungsZentrum laboratories using procedures described by Romer et al.

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Pb isotope ratios are similar in the three groups and are dominated by crustal Pb. Close mobile search navigation Article navigation. Ideal fractional crystallization is an oversimplification in some cases. Plagioclase phenocrysts from the MM centres show either moderate normal zonation in Aguiliri, An 50—37or oscillatory to slightly inverse zonation in Pan de Azucar; Fig. The latter values are similar to reported values for dacitic to rhyolitic Upper Miocene—Pliocene ignimbrites Ort et al.

This suggests that the westward shift of the arc towards its present position in the western Cordillera began in this region from 20—17 Ma and 14—12 Ma, and that the back-arc position of the northern Puna was probably established since the mid-Miocene. Salem dreams of being an actor but is still working in a gas station, only his love for Nada can make things easier for him.

Now Ghawar with the help of his friend Abu Antar has to find a way to get rid of his rival and marry Fatoum. The only reported Nd isotopic data for northern Puna basement rocks are from crustal xenoliths included in ignimbrites from Coranzuli Becchio et al.

Sabaya 2 — Comedy 3. X, xenocrysts; RI, relict inclusions. The mafic end-member composition used in the modelling is based on the Maquinas basalts Kay et al. Plagioclase from mineral clots Pan de Azucarwhich include relict aluminous minerals, is more calcic than lava phenocrysts Fig. Petrographic and geochemical results obtained may be briefly summarized as follows. The episodes focus on the events leading up to the arrest or time in captivity.

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The third volcanic phase 10—4 Ma overlaps with the Quechua phase, and is dominated by undeformed, large-volume ignimbrites Fig.

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The eruptive volumes of this early magmatic phase were similar to, or even higher sabaua, those of the second volcanic phase but volcanism was more restricted geographically, being confined to the areas around the Laguna de Pozuelos Fig. Wabaya samples from the mid-Miocene centres contain sillimanite, ilmenite, spinel and biotite as inclusions in plagioclase phenocrysts and in the cores of plagioclase—biotite clots.

The minor decrease in initial Sr isotope ratios and increase in Nd isotope ratio between the second-event and third-event lavas at Pan de Azucar is consistent with this hypothesis PA-6 and Iso-2 in Table 9respectively.

episods Finally, we wish to thank the people from the Puna of Jujuy for their hospitality, especially the personnel and teachers of many rural schools. Windows Comedy, Drama, Romance 7. The open box represents the field of 6—7 Ma Panizos ignimbrite Ort et al. We are also grateful to J.

The compositions of these rocks suggest that the mantle source was isotopically depleted at the beginning of the Andean orogenic cycle see Fig. Modelled Sm is too low, perhaps because bulk D has been overestimated, and the modelled Zr and Nb contents are too high, perhaps because the crystallization of accessory minerals is not considered. One represents partial melts of the mid- to upper sabbaya and for this we use the mean composition of Palaeozoic saabaya from northern Chile from Lucassen et al.

Like other northern Puna igneous rocks e.

In epiisode case of the UOLM and MM volcanic rocks, the locus of magmatism was roughly the same, so this explanation is unlikely. The increase in volume of hybrid magmas produced since the late Miocene could be a consequence of several processes that are interrelated: The interesting, funny, and symbolic events in a Syrian village inhabited by its simple and good hearted citizens.

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