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Title: Morphotectonic setting of maar lakes in the Campo de Calatrava Volcanic Field (Central Spain, SW Europe)
Authors: Martín-Serrano, Ángel ‎
Vegas Salamanca, Juana
García-Cortés, Ángel
Galán, Luis
Gallardo-Millán, José Luis
Martín Alfageme, Santiago
Rubio, Félix Manuel
Ibarra, Pedro I.
Granda Sanz, Ángel
Pérez-González, Alfredo
García-Lobón, José Luís
Keywords: Maar lakes;Phreatomagmatic eruptions;Electrical tomography;Neogene
Issue Date: Dec-2009
Publisher: Elsevier
Citation: Sedimentary Geology, 2009, 222 (1-2), 52-63
Abstract: In the Campo de Calatrava Volcanic Field (CCVF, Central Spain), the eruption of Pliocene–Pleistocene maar craters into two clearly distinct types of pre-volcanic rocks allows the observation and comparison of hard-substrate and soft-substrate maar lakes. Hard-substrate maars formed when phreatomagmatic processes affected the jointed, Paleozoic igneous and metamorphic rocks (hard substrate), giving rise to funnel-like maar lake basins. Soft-substrate maars resulted from phreatomagmatic volcanic processes affecting poorly-consolidated Pliocene sediments, forming bowl-like maar lake basins. Pre-volcanic bedrock determined the post-eruptive lacustrine architecture in the craters and favored a higher preservation of hard-substrate maars in comparison to soft-substrate maars. This is because the hard-substrate maars, surrounded by a deep stable crater wall, are more capable of collecting sediments in their basins. These sediments could be preserved for longer than similar deposits in broad, shallow maars with a soft substrate. Ancient soft-substrate maars do not usually preserve their original morphology well and can be identified only by their lacustrine deposits. Carbonate lacustrine/palustrine deposits surrounding a bowl-like depression are the remnants of this second type of maar lake, and allow reconstruction of the original morphology of ancient soft-substrate maar craters. Geophysical (electrical tomography ground surveys) and geomorphologic–geologic mapping techniques were combined with fieldwork and facies analysis in order to locate and accurately characterize the Pliocene–Pleistocene soft-substrate maar volcanic structures of the CCVF.
ISSN: 0037-0738
DOI: 10.1016/j.sedgeo.2009.07.005
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Type: Article
Appears in Collections:Geocronología y Geología

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