INVESTIGADORES
PETRINOVIC Ivan Alejandro
artículos
Título:
Phreatic to Phreatomagmatic eruptions in the Tocomar volcanic centre, Puna, Argentina
Autor/es:
IVAN ALEJANDRO PETRINOVIC; COLOMBO, F.
Revista:
Journal of Volcanology and Geothermal Research
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2006 vol. 158 p. 37 - 50
ISSN:
0377-0273
Resumen:
Two Pleistocene eruptions are studied, linked to an increment in the tectonic activity of an extensive system related to Calama
OlacapatoEl Toro Fault (COT Fault). The first one, consisting of dense pyroclastic flows and pyroclastic surges interbedded with
fall deposits, was caused by a phreatoplinian eruption. The second one, consisting of a succession of pyroclastic surges, derived
from a phreatic eruption. Both eruption vents have been located in en echelon normal faults with an NNE trend, and conjugated to
strike faults following an NNW trend. In both episodes pyroclastic deposits and ballistic blocks follow an ESSE trend, the
direction to which the fault planes and topographical slope lean. The obsidianic deposit filling the first eruption vent has the same
trend and dip as the main fault plane and provides (preliminary) evidences of syntectonic emplacement. On the other hand,
pyroclastic surge deposits linked to the second episode offer evidences of syndepositional faulting with listric growth faults. It is
concluded that this local horizontal area linked to the COT fault was intensely active during the Pleistocene and triggered both
eruptions.
direction to which the fault planes and topographical slope lean. The obsidianic deposit filling the first eruption vent has the same
trend and dip as the main fault plane and provides (preliminary) evidences of syntectonic emplacement. On the other hand,
pyroclastic surge deposits linked to the second episode offer evidences of syndepositional faulting with listric growth faults. It is
concluded that this local horizontal area linked to the COT fault was intensely active during the Pleistocene and triggered both
eruptions.
fall deposits, was caused by a phreatoplinian eruption. The second one, consisting of a succession of pyroclastic surges, derived
from a phreatic eruption. Both eruption vents have been located in en echelon normal faults with an NNE trend, and conjugated to
strike faults following an NNW trend. In both episodes pyroclastic deposits and ballistic blocks follow an ESSE trend, the
direction to which the fault planes and topographical slope lean. The obsidianic deposit filling the first eruption vent has the same
trend and dip as the main fault plane and provides (preliminary) evidences of syntectonic emplacement. On the other hand,
pyroclastic surge deposits linked to the second episode offer evidences of syndepositional faulting with listric growth faults. It is
concluded that this local horizontal area linked to the COT fault was intensely active during the Pleistocene and triggered both
eruptions.
direction to which the fault planes and topographical slope lean. The obsidianic deposit filling the first eruption vent has the same
trend and dip as the main fault plane and provides (preliminary) evidences of syntectonic emplacement. On the other hand,
pyroclastic surge deposits linked to the second episode offer evidences of syndepositional faulting with listric growth faults. It is
concluded that this local horizontal area linked to the COT fault was intensely active during the Pleistocene and triggered both
eruptions.
El Toro Fault (COT Fault). The first one, consisting of dense pyroclastic flows and pyroclastic surges interbedded with
fall deposits, was caused by a phreatoplinian eruption. The second one, consisting of a succession of pyroclastic surges, derived
from a phreatic eruption. Both eruption vents have been located in en echelon normal faults with an NNE trend, and conjugated to
strike faults following an NNW trend. In both episodes pyroclastic deposits and ballistic blocks follow an ESSE trend, the
direction to which the fault planes and topographical slope lean. The obsidianic deposit filling the first eruption vent has the same
trend and dip as the main fault plane and provides (preliminary) evidences of syntectonic emplacement. On the other hand,
pyroclastic surge deposits linked to the second episode offer evidences of syndepositional faulting with listric growth faults. It is
concluded that this local horizontal area linked to the COT fault was intensely active during the Pleistocene and triggered both
eruptions.
direction to which the fault planes and topographical slope lean. The obsidianic deposit filling the first eruption vent has the same
trend and dip as the main fault plane and provides (preliminary) evidences of syntectonic emplacement. On the other hand,
pyroclastic surge deposits linked to the second episode offer evidences of syndepositional faulting with listric growth faults. It is
concluded that this local horizontal area linked to the COT fault was intensely active during the Pleistocene and triggered both
eruptions.
SSE trend, the
direction to which the fault planes and topographical slope lean. The obsidianic deposit filling the first eruption vent has the same
trend and dip as the main fault plane and provides (preliminary) evidences of syntectonic emplacement. On the other hand,
pyroclastic surge deposits linked to the second episode offer evidences of syndepositional faulting with listric growth faults. It is
concluded that this local horizontal area linked to the COT fault was intensely active during the Pleistocene and triggered both
eruptions.