PERSONAL DE APOYO
MASSAFERRO Gabriela Isabel
artículos
Título:
Sub-recent volcanism in Northern Patagonia: A tectonomagmatic approach
Autor/es:
MASSAFERRO, GABRIELA ISABEL
Revista:
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2006 vol. 155 p. 227 - 243
ISSN:
0377-0273
Resumen:
The Crater Basalt Volcanic Field (CBVF) in northern Patagonia (∼42°S, Chubut province) is located 400 km eastward of the
current PeruChile Trench and to the southwest of the Meseta de Somuncura, in a back-arc position in the extra-Andean Patagonia.
The CBVF lava flows cover glaciation related terraces and present stream valleys. The occurrence of CBVF is related with the
Gastre Fault System (GFS), a very significant tectonic feature about 40 km wide.
The CBVF volcanics cover a surface of ∼700 km2, occurring mainly as lava flows and scoria cones. CBVF volcanics have
relatively high contents of MgO (69 wt.%), Cr (136289 ppm) and Ni (25198 ppm), and classify as alkali basalts, basanites and
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
relatively high contents of MgO (69 wt.%), Cr (136289 ppm) and Ni (25198 ppm), and classify as alkali basalts, basanites and
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The CBVF lava flows cover glaciation related terraces and present stream valleys. The occurrence of CBVF is related with the
Gastre Fault System (GFS), a very significant tectonic feature about 40 km wide.
The CBVF volcanics cover a surface of ∼700 km2, occurring mainly as lava flows and scoria cones. CBVF volcanics have
relatively high contents of MgO (69 wt.%), Cr (136289 ppm) and Ni (25198 ppm), and classify as alkali basalts, basanites and
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
relatively high contents of MgO (69 wt.%), Cr (136289 ppm) and Ni (25198 ppm), and classify as alkali basalts, basanites and
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
current PeruChile Trench and to the southwest of the Meseta de Somuncura, in a back-arc position in the extra-Andean Patagonia.
The CBVF lava flows cover glaciation related terraces and present stream valleys. The occurrence of CBVF is related with the
Gastre Fault System (GFS), a very significant tectonic feature about 40 km wide.
The CBVF volcanics cover a surface of ∼700 km2, occurring mainly as lava flows and scoria cones. CBVF volcanics have
relatively high contents of MgO (69 wt.%), Cr (136289 ppm) and Ni (25198 ppm), and classify as alkali basalts, basanites and
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
relatively high contents of MgO (69 wt.%), Cr (136289 ppm) and Ni (25198 ppm), and classify as alkali basalts, basanites and
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The CBVF lava flows cover glaciation related terraces and present stream valleys. The occurrence of CBVF is related with the
Gastre Fault System (GFS), a very significant tectonic feature about 40 km wide.
The CBVF volcanics cover a surface of ∼700 km2, occurring mainly as lava flows and scoria cones. CBVF volcanics have
relatively high contents of MgO (69 wt.%), Cr (136289 ppm) and Ni (25198 ppm), and classify as alkali basalts, basanites and
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
relatively high contents of MgO (69 wt.%), Cr (136289 ppm) and Ni (25198 ppm), and classify as alkali basalts, basanites and
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
∼42°S, Chubut province) is located 400 km eastward of the
current PeruChile Trench and to the southwest of the Meseta de Somuncura, in a back-arc position in the extra-Andean Patagonia.
The CBVF lava flows cover glaciation related terraces and present stream valleys. The occurrence of CBVF is related with the
Gastre Fault System (GFS), a very significant tectonic feature about 40 km wide.
The CBVF volcanics cover a surface of ∼700 km2, occurring mainly as lava flows and scoria cones. CBVF volcanics have
relatively high contents of MgO (69 wt.%), Cr (136289 ppm) and Ni (25198 ppm), and classify as alkali basalts, basanites and
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O2 of −1.0 1 to 0.0 (log FMQ units).
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
The petrographic and geochemical characteristics of CBVF products suggest that the magma originated from a garnet-bearing
lherzolite mantle source with asthenospheric characteristics, as a result of decompression, partial melting and ascent. These melts
would have risen through a system of deep faults like the Gastre Fault System, following the last Quaternary glacial event.
© 2006 Published by Elsevier B.V.
trachybasalts. Geothermometry indicates a crystallization temperature of ∼1140 °C and a O