Universidad Complutense de Madrid
E-Prints Complutense

Silicificación y paleokarstificación en depósitos evaporíticos continentales (Hoya de la Sima, Jumilla)

Impacto

Downloads

Downloads per month over past year



Bustillo Revuelta, María Ángeles and Arias, Consuelo and Vilas Minondo, Lorenzo (2000) Silicificación y paleokarstificación en depósitos evaporíticos continentales (Hoya de la Sima, Jumilla). Geotemas, 1 (3). pp. 209-212. ISSN 1576-5172

[img] PDF
1MB

Official URL: http://www.sociedadgeologica.es/publicaciones_geotemas.html



Abstract

In the Northwest of the locality of Jumilla (Murcia, Spain) several evaporitic deposits with opaline cherts are found. The evaporites are mainly lenticular gypsums, which show, at the base, millimetric levels of micrites with ostracods and, at the top, a bioturbated carbonated gypsum bed. The opaline cherts are composed of quartz, opal CT and relics of host rocks (gypsum and calcite). A latter karstification affected these deposits and several karstic fillings with fragments of opaline cherts appear. The gypsums were deposited in a small, shallow (the presence of mammal tracks indicates a stage when the lakebed was exposed) and closed continental lake, between the Upper Miocene and the Pliocene. The opaline cherts were formed by early silicification of the bioturbated carbonated upper bed and by a "per descensum" silicification of the gypsums, mainly through fractures. The very rich silica solutions that produced the opaline cherts probably come from springs and fractures that are found in the zone.


Item Type:Article
Uncontrolled Keywords:Opal, Gypsum, Continental, Silicification, Karstification
Subjects:Sciences > Geology > Stratigraphic geology
ID Code:61529
Deposited On:20 Jul 2020 07:06
Last Modified:20 Jul 2020 07:06

Origin of downloads

Repository Staff Only: item control page