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Different barite deposits (stratabound, vein and karstic types) are occurring in the Lower Cambrian carbonatic materials of the Cerro del Hierro, Sevilla (Ossa-Morena Zone). Calcite, hematite, goethite and minor chalcopyrite are common associated minerals, with limonite and malachite as alterations. The content of barite can be as high as 98 %. There is a close relationship between barite type and Sr content (vein < stratabound < karstic deposits). &#206;&#180;34S ranges between 32,7 &#226;&#128;&#176; (stratiform barites) and 20,7 &#226;&#128;&#176; (epigenetic barites). The 87Sr/86Sr ratio for the epigenetic barites oscillates between 0.70873 and 0.71112 which could be the result of the infiuence of different mineralization solutions. A primary origin for the stratabound barites is proposed, in relation with the diagenesis of the limestones occurred during the Lower Cambrian. Epigenetic barites were formed after the Hercynian Orogenesis by remobilization of the stratiform ores, with Ba and Sr supplied from the lixiviation of the host rocks. The last process could be much more important for the karstic barite formation. En los materiales carbonatados del C&#225;mbrico inferior del Cerro del Hierro (Zona de Ossa-Morena) existen diversos tipos de mineralizaciones de barita (estratoligadas, filonianas y k&#225;rsticas). La barita est&#225; acompa&#241;ada de calcita, hematites, goethita, y calcopirita accesoria, y limonitas y malaquita como fases tard&#237;as de alteraci&#243;n, y presenta una gran pureza qu&#237;mica [ > 98% SO4(Ba,Sr)]. Existe una relaci&#243;n entre la tipolog&#237;a de la barita y el contenido en Sr, en el sentido de filonianas < estratoligadas < k&#225;rsticas. &#206;&#180;34S en las baritas oscila entre 32,7 &#226;&#128;&#176; para las estratoligadas y 20,7 &#226;&#128;&#176; para las epigen&#233;ticas. Las razones 87Sr/86Sr determinadas sobre baritas epigen&#233;ticas var&#237;an entre 0.70873 y 0.71112, lo que puede interpretarse como consecuencia de la participaci&#243;n de diversos tipos de soluciones mineralizantes. Se propone un origen primario de las baritas estratoligadas, en relaci&#243;n con la diag&#233;nesis de los materiales carbonatados durante el C&#225;mbrico inferior. Las baritas epigen&#233;ticas se formaron tras la Orogenia Herc&#237;nica, como consecuencia de la removilizaci&#243;n de las baritas estratoligadas previas y con el aporte de Ba y Sr lixiviados de las rocas encajantes. Este &#250;ltimo mecanismo parece haber sido m&#225;s marcado en las baritas k&#225;rsticas

Las mineralizaciones de barita de Cerro del Hierro (Sevilla). Características mineralógicas y geoquímica