Publikationsdatum:
2017-04-04
Beschreibung:
Morphologic data for 147 cinder cones in southernGuatemala andwestern El Salvador are comparedwith data from 21
the San Francisco volcanic field, Arizona (USA), Cima volcanic field, California (USA), Michoácan–Guanajuato 22
volcanic field, Mexico, and the Lamongan volcanic field, East Java. The Guatemala cones have an average height of 23
110+/−50m, an average basal diameter of 660+/−230m and an average top diameter of 180+/−150m. The 24
generalmorphology of these cones can be described by their average cone angle of slope (24+/−7), average height- 25
to-radius ratio (0.33+/−0.09) and their flatness (0.24+/−0.18). Although the mean values for the Guatemalan 26
cones are similar to those for other volcanic fields (e.g., San Francisco volcanic field, Arizona; Cima volcanic field, 27
California; Michoácan–Guanajuato volcanic field, Mexico; and Lamongan volcanic field, East Java), the range of 28
morphologies encompasses almost all of those observed worldwide for cinder cones. 29
Three new 40Ar/39Ar age dates are combined with 19 previously published dates for cones in Guatemala and El 30
Salvador. There is no indication that the morphologies of these cones have changed over the last 500–1000 ka. 31
Furthermore, a re-analysis of published data for other volcanic fields suggests that only in the Cima volcanic field (of 32
those studied) is there clear evidence of degradation with age. 33
Preliminary results of a numerical model of cinder cone growth are used to show that the range of morphologies 34
observed in the Guatemalan cinder cones could all be primary, that is, due to processes occurring at the time of 35
eruption.
Beschreibung:
Support for Walker was provided by NSF MARGINS grant OCE-0405666.
Beschreibung:
In press
Beschreibung:
3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
Beschreibung:
3.6. Fisica del vulcanismo
Beschreibung:
JCR Journal
Beschreibung:
reserved
Schlagwort(e):
cinder cones
;
morphology
;
age dating
;
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
;
04. Solid Earth::04.08. Volcanology::04.08.03. Magmas
;
04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
;
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
;
05. General::05.02. Data dissemination::05.02.99. General or miscellaneous
;
05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
Repository-Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Materialart:
article
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