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- W2052205130 abstract "The area investigated lies between latitude 26°40′ and 27°15′ south and longitude 69°30′ and 68°30′ west in the Andean Range. A combination of K-Ar dating, petrology, geochemistry and geophysical data has led to the recognition of an important change in the tectonic control of volcanic activity during the early Pliocene. Five volcanic cycles are recognized and grouped into two units according to tectonic control. The first unit comprises the following cycles; (a) La Coipa-Maricunga 23.0−15.7 Ma; (b) Pastillito 13.9−12.9 Ma; and (c) Wheelwright 8.84−6.14 Ma; representing a progression of active belts, striking N5°E, towards the east. The second group is represented by Pen̄as Biancas 4.90−2.64 Ma and Ojos del Salado 1.84-Recent (active) having a N65°E strike, extending over a distance of some 250 km in the high Andes. The volcanic rocks of both groups belong to the calc-alkali series ranging from andesitic basalt to andesite, dacite and rhyolite, though with significant variations in total alkali content. Changes in the orientation of the volcanic belt may be related to changes in the spreading rate of the Nazca Plate or to changes in the angle of subduction on either side of latitude 27°S i.e. along the latitude of the Easter Hot Line." @default.
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- W2052205130 date "1985-03-01" @default.
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- W2052205130 title "Tectonic-volcanic discontinuity at latitude 27° south Andean Range, associated with Nazca Plate Subduction" @default.
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- W2052205130 doi "https://doi.org/10.1016/0040-1951(85)90189-1" @default.
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