R. S. Thorpe (auth.), R. S. Harmon, B. A. Barreiro (eds.)'s Andean Magmatism: Chemical and Isotopic Constraints PDF

By R. S. Thorpe (auth.), R. S. Harmon, B. A. Barreiro (eds.)

ISBN-10: 1468473352

ISBN-13: 9781468473353

ISBN-10: 1468473379

ISBN-13: 9781468473377

Destructive plate margin magmagenesis is likely one of the such a lot intensely studied and commonly debated subject matters within the earth sciences at the present. Calc-alkaline volcanic and plutonic rocks in orogenic settings convey this type of range of composition and personality that the subducted oceanic lithosphere, the overlying 'enriched' lithospheric mantle and the reduce continental crust all were recommended lately because the basic resource sector for island-arc and continental-margin basaltic to andesitic magmas. The position of the higher continental crust is usually an issue of constant controversy. it really is transparent that crustal infection is a typical, yet no longer common, characteristic of damaging plate margin magmatism. no matter if this infection is brought at resource through subduction-related strategies or happens in the course of magma transit via bulk anatexis and magma blending, selective infection or coupled fractional crystallization-assimilation mechanisms is vital to most present discussions of andesite petrogenesis. This ebook offers a chain of papers which at once tackle those and different very important geological and geochemical difficulties in the context of the Mesozoic-Cenozoic calc-alkaline magmatism attribute of the Andean Cordillera of western South the USA. even though it is aimed essentially at postgraduate scholars and researchers conversant in the Andes, it's also an invaluable basic reference for staff in different fields who desire to achieve an perception into present recommendations, rules and speculations on 'andesitic' magmatism at damaging plate margins.

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Extra info for Andean Magmatism: Chemical and Isotopic Constraints

Sample text

The main volcanic group in this area is Nevados de Chillan (Deruelle and Deruelle, 1974). This is composed by lavas of andesitic to dacitic composition which lack hornblende. In Province III between 48-56°S, only five stratovolcanoes are known. , this volume). Province III andesites and dacites are similar petrographically to those from Province I which, in turn, are similar to andesites and dacites from the Central Andes volcanic zone. In the three provinces plagioclase is the most abundant phenocryst and groundmass phase, a feature which is typical of modern orogenic lavas (Ewart, 1976).

Continental volcanic rocks and mantle nodules record a complex history for the subcontinental mantle. Tilton (1983) summarizes the evidence that depleted mantle with low 207Pbj204Ph and 208Pb/204 Pb is present beneath the continents as well as the oceans. Some continental flood basalts, however, have high 207Pbj204Pb and 208Pbj204Pb, but are depleted in 206Pb/204 Pb. 0 ! •• ~o .... 'WI' .... ,. ,t'!. . :..... . - ... : ( .. o ' • 23 .. ,'" • . .. ,,: -... ....... '.. i.. -,,1. ••.. , . f A:_ :.

LOPEZ-ESCOBAR Abstract Pliocene to Quaternary volcanic rocks of andesitic to dacitic composItIOn predominate in the northern (33-37°S; Province I), and southern (48-56°S; Province III) sectors of the SVZ, whereas rocks of basaltic composition predominate in the central sector (37-46°S; Province II). g. Quetrupilhin, Lanin and Puyehue volcanoes). g. Marmolejo-San Jose volcanic group and Mt. g. Antuco, Callaqui, Lonquimay, Villarrica, Puyehue, Osorno, Puntiagudo and Calbuco volcanoes). Nevados de Chillan (36° 50'S) located near the boundary of Provinces I and II is transitional, with lavas of andesitic composition lacking hornblende.

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Andean Magmatism: Chemical and Isotopic Constraints by R. S. Thorpe (auth.), R. S. Harmon, B. A. Barreiro (eds.)


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