 | Galindo, C., Tornos, F., Darbyshire, D.P.F., Casquet, C. (1994) The age and origin of the barite-fluorite (PbZn) veins of the Sierra del Guadarrama (Spanish Central System, Spain): a radiogenic (Nd, Sr) and stable isotope study. Chemical Geology, 112 (3) 351-364 doi:10.1016/0009-2541(94)90034-5 | Journal (article/letter/editorial) | | [PD] The age and origin of the barite-fluorite (Pb-Zn) veins of the Sierra del Guadarrama (Spanish Central...Central System, Spain): a radiogenic (Nd, Sr) and stable isotope study C. Galindo a, F. Tornos b, D.P.F...Complutense de Madrid, 28040 Madrid, Spain blnstituto Tecnol6gico Geominero de Espa~a, 28003 Madrid, Spain CNERC... 1993 ) ABSTRACT Fluorite and barite-rich veins ( + sulphides) of the Sierra del Guadarrama (Spanish...granitoids. Zoned fluorites from one of these veins have a Sm-Nd age of 145 + 18 Ma. This age is similar |  | | Journal (article/letter/editorial) | | evidence for fluid mixing in the genesis of Ba-F (Pb-Zn) lodes of the Spanish Central System F. TORNOS,...28003 Madrid, Spain 2Facultad dc Ciencias Geoldgicas, Universidad Complutensr 28004 Madrid, Spain Abstract...genesis of B a - F (Pb-Zn) lodes of the Spanish Central System as related to fluid mixing of hot (>300...more saline (>2.8 molal), N a - K - C a - M g brines of phraeatic origin. Ore formation took place at relative...(from 270 to 120~ in a regime of increasingfoz, (Ca + Mg)/Na ratio and pH of the fluids towards the surface |  | | Journal (article/letter/editorial) | | isotopic heterogeneity and secondary disturbance of the Sm-Nd system in fluorites and fluid inclusions:...taken from one hand-specimen of probable late Variscan age. Nd concentrations of fluorites range from 3.6...23 ppm, ‘47Sm/‘“Nd ratios from 0.12 to 0.35. None of the sample sets yielded an isochron relationship...Alpine, reflecting neither the formation nor the age of metamorphic overprint. Reasons are wall-rock influence...Secondary fluorite (Gotthard) shows the highest Nd concentration and a low Sm/Nd ratio, close to that of fluid |  | | Journal (article/letter/editorial) | | El Paso,Texas79968 Abstract In the northernpart of the Guanajuatodistrict,a Cretaceousvolcano-sedimentary...ophioliteaffinitiesandtonalitcof a continentalmagmaticare, all of Mesozoicage. Subsequently, the volcano-sedimentary...followingerosionandpreservedin the centralandsouthernpart of the district,the continentalGuanajuatoConglomeratewas...volcano-plutonic centerwhichexhibitsseveralcharacteristics of a caldera, formednear the intersectionof regiona...Calderafill includesa basesurgedepositand up to 360 m of rhyoliticfill, megabreccia, andperipheralrhyolitedomes |
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San Eusebio Mine, La Corvera, Colmenar del Arroyo, Community of Madrid, Spain