Publication Date:
2017-04-04
Description:
Geomorphometric parameters (slope, aspect, valley depth, and areal density of cones)
derived from a moderate resolution digital elevation model with a grid spacing of
100 m are used in an attempt to interpret the tectonic/structural features related to surface
deformation in the Auca Mahuida volcanic terrain (Neuquén Basin, Argentina).
The Auca Mahuida (2.03–0.88 Ma) is the southernmost volcanic field of the Payenia
volcanic province, in the Andean foreland. The foreland is subjected to an E–W
compression related to the eastward migration of the N–S striking thrust front of the
Andes. The geomorphometric analysis indicates that the Auca Mahuida consists of a
basal, E–W elongated lava field with monogenic vents and a summit, polygenic, also
E–W elongated, cone. A N100◦E striking fault controls the southern flank of the field,
which is also affected by scarps related to erosional and gravity-controlled processes.
The drainage network shows a pseudo-radial pattern around the summit cone, and
the Auca Mahuida’s deepest valley is structurally controlled by a NNW–SSE striking
fault affecting the sedimentary basement. The volcanic field lies on a NE to E dipping
substratum. The areal distribution of the monogenic cones is consistent with ascent of
magmas along E–W striking fractures, and with elastic models of a pressurized hole
(magma chamber) subjected to an E–W compression. At Auca Mahuida, the ascent
of melts from the mantle is controlled, in the overriding crust, by tectonic structures
formed in response to the E–W compression of the Andes.
Description:
INGV abd YPF
Description:
Published
Description:
1469-1480
Description:
1.10. TTC - Telerilevamento
Description:
3.2. Tettonica attiva
Description:
3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
Description:
JCR Journal
Description:
restricted
Keywords:
geomorphology
;
volcanism
;
tectonics
;
04. Solid Earth::04.04. Geology::04.04.03. Geomorphology
;
04. Solid Earth::04.04. Geology::04.04.09. Structural geology
;
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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