Geología de tos diapiros triásicos en el noreste de la provincia de Murcia

Abstract

Main stratigraphic characteristics of triassic diapires: Jumilla, La Celia, Yecla and La Rosa, their tectonics and their environements are studied; all of them are situated in the Northeast Prebetic of Murcia province. Stratigraphically, three stretches are estimated: a detrital-argillaceous-dolomitic one with ocher-yellowish colours in its base, another gypseous-argillaceous intermediate one with vivid red colours and a third one, in the top, with well stratiphied grey scarfed gypsum and some interpolations of dolomites and black clays. Salt ls under the basal stretch and it's developed in most of the up to here studied diapires. As a whole, it's an evaporitic basin in a central position where saline and penesaline litotopes, with tendency to euxinic ones, have been identified. Moreover, we emphasize the existence of volcanic rocks of a lamproitic type which are inserted in the just described materials. From a structural point of view, all these diapires are injected with faults of a regional character; inside them a radial and occasionally concentric fracturation is observed. The "mis en place" of these autcroppings is connected with the main alpine folding stage, Nevertheless, the alocinetic effects work almost to this day providing a neotectonic connected to diapirism which has been displayed on folds , faults and peripheric grooves of materials belonging to Pliocene and Quaternary; in these last ones, old lakes formed where turbidites associated to evaporites settled.