RT Journal Article
T1 Turbiditas asociadas a evaporitas(Mioceno, La Malá, Depresión de Granada)
A1 Dabrio, Cristino J.
A1 García Yebra, R.
A1 González Donoso, J. M.
A1 Vera, J.A.
AB The Granada Basin is one of the most typical intramontane basins in the Betic Cordilleras. A turbidite-evaporitic sequence of upper Miocenic age is one of the deposita found in the Malá area (SW of Granada). Deposition occured in a sea which was closed in and where water circulation was restricted and only episodically comunicated with the open sea; thus it is a transition from a marine to a lacustrine environment.The sequences of primary internal sedimentary structures sole marks on sandstone beds and the mineralogical composition and texture of sandstones, indicate deposition by turbidity currents. The intercalated evaporite layers andthe presence of hard grounds in the lutitic beds as well as the absence of autochtonous fossils are noteworthy inasmuch as they constitute the only features which dífferenciate these materials from the actually being deposited in deep marine basins.Tbe lack of autochtonous fossils and biogenic structures is explained by the hypersality of the waters, where life wouldbe practically impossible.On the basis of the paleocurrents and the mineralogical composition of the sandstones, the turbidity currents wereproved to originate in the Sierra Nevada area. The regional and paleogeographical data lead us to believe that fue shoreline was located 20 Km. to the East. The turbidity currents flowed from the Sierra Nevada margins to the interior of anevaporitic basin and sediments supplied by there currents became interbedded in the evaporitic sequence. Therecurrents carried sediments in succesive flows either from materials carried by Sierra Nevada rivers or from depositspreviously accumulated at their mouths.Finally, a comparison is made of this facies with flysch, taking into account the definitions and concepts of different authors. Since we are dealing with materials displaying postorogenic character tue term turbidite is used instead of flysch.
PB Granada : Secretariado de Publicaciones de la Universidad, C.S.I.C, Sección de Geología de la Facultad de Ciencias
SN 0366-600X
YR 1972
FD 1972
LK https://hdl.handle.net/20.500.14352/64546
UL https://hdl.handle.net/20.500.14352/64546
LA spa
DS Docta Complutense
RD 5 dic 2023