The Nevados de Payachata volcanic region (18°S/69°W, N. Chile)

  title={The Nevados de Payachata volcanic region (18°S/69°W, N. Chile)},
  author={Gerhard W{\"o}rner and Russell S. Harmon and John Davidson and Stephen Erwin Moorbath and Donald L. Turner and N. McMillan and C. Nyes and Leopoldo Lopez-escobar and Hugo Moreno},
  journal={Bulletin of Volcanology},
Subduction-related volcanism in the Nevados de Payachata region of the Central Andes at 18°S comprises two temporally and geochemically distinct phases. An older period of magmatism is represented by glaciated stratocones and ignimbrite sheets of late Miocene age. The Pleistocene to Recent phase (≤0.3 Ma) includes the twin stratovolcanoes Volcan Pomerape and Volcan Parinacota (the Nevados de Payachata volcanic group) and two small centers to the west (i. e., Caquena and Vilacollo). Both… 

The Nevados de Payachata volcanic region (18°S/69°W, N. Chile) II. Evidence for widespread crustal involvement in Andean magmatism

Volcanism extending over 11 Ma is represented in the rocks of the Nevados de Payachata region, culminating in the formation of two large composite stratocones within the last 500 000 years.

Temporal Evolution of Magmatism in the Northern Volcanic Zone of the Andes: The Geology and Petrology of Cayambe Volcanic Complex (Ecuador)

In the Northern Volcanic Zone of the Andes, the Cayambe Volcanic Complex consists of: (1) a basal, mostly effusive volcano, the Viejo Cayambe, whose lavas (andesites and subordinate dacites and

Mixed-magma pyroclastic surge deposits associated with debris avalanche deposits at Colima volcanoes, Mexico

The transition between the terminal cones and the ancestral edifices of Nevado de Colima and Fuego de Colima volcanoes is marked by the deposits of gigantic volcanic debris avalanches of the Mount

Chemistry and petrological evolution of the Lastarria volcanic complex in the north Chilean Andes

Abstract The Lastarria volcanic complex, along the northern Chile–Argentina border, includes three morphostructural components: Southern Spur, Lastarria (the highest cone, 5697 m) and Negriales (a

Volcano evolution and eruptive flux on the thick crust of the Andean Central Volcanic Zone: 40Ar/39Ar constraints from Volcan Parinacota, Chile

The 163 k.y. history as well as the chemi- cal and 46 km 3 volumetric evolution of Vol- can Parinacota are described in detail by new mapping, stratigraphy, and 57 40 Ar/ 39 Ar ages determined from

Glacial and volcanic geomorphology of the Chimborazo-Carihuairazo Massif, Ecuadorian Andes

  • C. Clapperton
  • Geology, Geography
    Transactions of the Royal Society of Edinburgh: Earth Sciences
  • 1990
ABSTRACT The Chimborazo (6,310 m)–Carihuairazo (5,102 m) massif is one of the largest ice-capped central volcanic complexes in the northern Andes. Combined evidence from volcanic and glacial



Volcanological and petrological evolution of San Pedro volcano, Provincia EI Loa, North Chile

The 6163 m high volcano San Pedro in the Western Cordillera of the central Andes of North Chile, is a composite of two cones, each representing a different structural and chemical stage in the

Andean Cenozoic volcanism: Magma genesis in the light of strontium isotopic composition and trace-element geochemistry

Subduction of the oceanic Nazca plate beneath the western edge of the South American plate is thought by most proponents of plate theory to have generated the tectonic forces and magmatic activity

Regional O-, Sr-, and Pb-isotope relationships in late Cenozoic calc-alkaline lavas of the Andean Cordillera

Quaternary-Recent volcanism in the Andes has occurred in three regions: 45–33°S, 28–16°S and 2°S–5°N, each of which has a distinct plate tectonic setting and contains volcanic suites with different

Combined Sr–O isotope relationships and petrogenesis of Andean volcanics of South America

Active andesitic-type volcanism in the southern Andes (lat. 42–36° S) is characterized by low Sr- and O-isotopic compositions which fall in the range 87Sr/86Sr = 0.7036–0.7043, δ18O = 5.2–6.8‰. In

Geochemical Variations in Volcanic Rocks from Central-south Chile (33–42°S)

Pliocene to Recent volcanic rocks from central-south Chile (33–42°S) have 143Nd/144Nd (0.51269–0.51291), 87Sr/86Sr (0.70381–0.70464) and 18O/16O (5.2–6.8‰) ratios which overlap with those in