%0 Journal Article
%A Galindo Francisco, Mª del Carmen
%A Portugal Ferreira, Martín R.
%A Casquet, César
%A Priem, H.N.A.
%T Dataciones Rb/Sr en el complejo plutónico Táliga Barcarrota(CPTB) (Badajoz)
%D 1990
%@ 0213-683X
%U https://hdl.handle.net/20.500.14352/56932
%X The Plutonic Complex of Táliga-Barcarrota crops out in the core of the Olivenza-Monesterioanticline, where it intrudes the Upper Precambrian and Lower Cambrianmetasediments. As this Complex is made of a) the Circular Pluton of Barcarrota, wherethe core is constituted by gabbros, diorites and pegmatoides and the outer rim showsquartz monzonites, quartz syenites and hypersolvus granites, and b) the NW-SE elongatedTáliga Massif, almost entirely made of biotite orthogneisses, the sampling and the analyseswere done in accordance with this double character of the Complex. Taking into accountthe K/Ar ages obtained on amphiboles, biotites and muscovites and the two Rb/Sr"isochrones" (whole rocks), it is concluded that 1) the Táliga Massif has an intrusion ageof 525±2.5 M.A and a subsecuent pervasive recrystallization during the first hercynianphase, 385 ± 11 M.A, and 2) the Barcorrota Complex has an intrusion age of 505±5 M.A,as it is shown by the K/Ar and the Rb/Sr systematics. Also the Barcarrota Plutonic rockshave lower initial Sr87/Sr86 (O,7031±5X1O-6 than the Táliga orthogneisses (0.70836±9Xl0-5)pointing to a mantle versus. Crostal origin for both groups of magmas.
%~