RT Journal Article
T1 Silicificación y paleokarstificación en depósitos evaporíticoscontinentales (Hoya de la Sima, Jumilla)
A1 Bustillo Revuelta, María Ángeles
A1 Arias, Consuelo
A1 Vilas Minondo, Lorenzo
AB 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.
PB Sociedad Geológica de España.
SN 1576-5172
YR 2000
FD 2000
LK https://hdl.handle.net/20.500.14352/57969
UL https://hdl.handle.net/20.500.14352/57969
LA spa
NO Dirección General de Investigación Científica y Técnica
DS Docta Complutense
RD 17 abr 2025