Mathematics – Logic
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.148..287h&link_type=abstract
Earth and Planetary Science Letters, Volume 148, Issue 1, p. 287-298.
Mathematics
Logic
6
Scientific paper
The Almadén mercury deposits represent one of the largest geochemical anomalies on Earth, but the mode and timing of their formation remains a matter of controversy. There are two main possibilities: hydrothermal solutions associated with alkali basalt volcanism in the Silurian and Devonian; or regional hydrothermal activity during later Hercynian metamorphism. Although these models can be distinguished by determining the age of ore deposition, no suitable isotopic method had been applied to the problem prior to this study. We report here on vacuum encapsulated and more traditional laser40Ar/39Ar dating performed on illite concentrates and Cr-rich micas that are intimately associated with mercury mineralization in both Devonian and Silurian host rocks. Illite is associated with a later stage of Hg mineralization (cinnabar + kaolinite + pyrophyllite + chlorite) which locally replaces an earlier episode associated with carbonates and Cr-mica. The dating results from illite separates suggest that the later stages of Hg mineralization or remobilization occurred about 360 Ma, which is about 20 Ma younger than any mercury-hosting rocks in the district and coincides with the onset of regional deformation during the Hercynian orogeny. Cr-mica ages are variable and range from 365 Ma to 427 Ma. This age range spans the period between the deposition of the Criadero quartzite (the oldest sedimentary unit hosting mercury), and the later episode of mineralization. This suggests that mineralization started at least by the mid to lower Silurian and the younger argon ages for Cr-mica could represent partial to nearly total argon loss, caused by the Hercynian metamorphic event. It appears that both postulated styles of mercury mineralization occurred, separated in time by up to 80 million years.KeywordsAlmaden Spainabsolute agealterationmercury oresmineralizationReferencessOrtegaE.HernándezA.The mercury deposits of the Almadén syncline SpainChron. Mines Rech. Minière5061992311FitzgeraldW.F.Atmospheric and oceanic cycling of mercuryRileyJ.P.ChesterR.Chemical OceanographyVol. 101989151186NriaguJ.O.A global assessment of natural sources of atmospheric trace metalsNature33819894749SmithP.E.EvensenN.M.YorkD.First successful40Ar-39Ar dating of glauconites; argon recoil in single grains of cryptocrystalline materialGeology2119934144DongH.HallC.M.PeacorJ.R.HallidayA.N.Mechanisms of argon retention in clays revealed by laser40Ar/39Ar datingScience2671995355359HiguerasP.MunháJ.Geochemical constraints on the petrogenesis of mafic magmas in the Almadén mercury mining districtTerra Abstr.19935HiguerasP.Procesos petrogenéticosy de alteración de las rocas magmáticas asociadas a las mineralizaciones de mercurio del distrito de AlmadénPh.D. Thesis1994Univ. GranadaSáinz de BarandaB.LunarH.R.El volcanismo alcalino pre-Hercinico del sinclinal de AlmadénEstud. Geol.451989337348HiguerasP.MorataD.MunháJ.Metamorfismo de bajo grado en facies prehnita-pumpellyita en las metabasitas del sinclinal de AlmadénBol. Soc. Esp. Mineral.181995111125SaupéF.La géologie du gisement de mercure d'Almadén (Province de Ciudad Real, Espagne)Sci. Terre291973342WagnerR.Upper Stephanian stratigraphy and paleontology of the Puertollano BassinCiudad Real, Spain, An. Fac. Cienc. Porto641985171193SaupéF.Geology of the Almadén mercury deposit, Province of Ciudad Real, SpainEcon. Geol.851990482510BorreroJ.HiguerasP.Nuevos conocimientos sobre la geología y metalogénesis de los yacimientos de mercurio de Almadén (Ciudad Real)Bol. Geol. Min.101619904867García PalaciosA.Gutierrez-MarcoJ.C.HerranzP.Edad y correlación de la “Cuarcita de Criadero” y otras unidades cuarcíticas del límite Ordovícico-Silúrico en la Zona Centroibérica meridional (Espan˜a y Portugal)Geogaceta20119961922RytubaJ.J.HernandezA.M.RyeR.O.DeanJ.A.ArribasA.Sr.Genesis of Almadén-type mercury deposits, Almadén, SpainAbstr. 28th Int. Geol. Congr.Vol. 21989741WashingtonJébrakM.HernándezA.Tectonic deposition of mercury in the Almadén district, Las Cuevas Deposit, SpainMiner. Deposita301995413423SaupéF.ArnoldM.Sulphur isotope geochemistry of the ores and country rocks at the Almadén mercury deposit, Ciudad Real, SpainGeochim. Cosmochim. Acta56199237653780de BoorderH.WesterhoffA.B.Tectonic control of early to middle Paleozoic volcanism and related mercury and antimony mineralization in southern central IberiaEcon. Geol.891994656661HiguerasP.Alteration of basic igneous rocks from the Almadén mining districtFenollP.TorresJ.GervillaF.Current Research in Geology Applied to Ore Deposits1993Univ. Granada131134HiguerasP.ParrasJ.SanchezC.Procesos de alteración asociados a la removilización hidrotermal de cinabrio en el yacimiento de “Las Cuevas” (Almadén, Ciudad Real)Bol. Soc. Esp. Mineral.181995191200SamsonS.D.AlexanderE.C.Calibration of the interlaboratory40Ar-39Ar dating standard, Mmhb-1Chem. Geol.6619872734TurnerG.Thermal histories of meteorites by the39Ar-40Ar methodMillmanP.M.Meteorite Research1969KluwerDordrecht407417BrayC.J.SpoonerE.T.C.HallC.M.YorkD.BillsT.M.KruegerH.W.Laser probe40Ar/39Ar and conventional K-Ar dating of illites associated with the McClean unconformity-related uranium deposits, North Saskatchewan, CanadaCan. J. Earth Sci.2419871023AwwillerD.N.BurgessR.AyliffeL.K.TurnerG.40Ar/39Ar systematics in a diagenetic-to contact metamorphic-grade clay mineral suite, Northern North Sea8th Int. Conf. on Geochronology, Cosmochronology and Isotope GeologyU.S. Geol. Surv. Circ. 1107199415FolgerH.W.SneeL.W.MehnertH.H.HofstraA.H.DahlA.R.Significance of K-Ar and40Ar/39Ar dates from mica in Carlin-type gold deposits: evidence from the Jerritt Canyon district, NevadaGeology and Ore Deposits of the American Cordillera, Reno/Sparks, NevadaProgram with Abstracts1995A31Serrano PintoM.CasquetC.IbarrolaE.CorretegéL.G.Portugal FerreiraM.Sintese geocronologica do granitoides do Maciço HespericoEstud. Geol.5019946986NäglerT.F.SchäferH.-J.GebauerD.A Sm-Nd isochron on pelites 1 Ga in excess of their depositional age and its possible significanceGeochim. Cosmochim. Acta561992789795ParèsJ.Van der VooR.Paleozoic paleomagnetism of Almadén, Spain: A cautionary noteJ. Geophys. Res.97199293539356PerroudH.CalzaF.KhattachD.Paleomagnetism of the Silurian volcanism at Almadén, Southern SpainJ. Geophys. Res.96199119491962LeutweinF.SaupéF.SonetJ.BouyxE.Première mesure géochronologique en Sierra Morena: La granodiorite de Fontanosas (Province de Ciudad Real, Espagne)Geol. Mijnb.491970297304HallidayA.N.MitchelJ.G.K-Ar ages of clay-size concentrates from the mineralization of the Pedroches Batholith, Spain, and evidence for Mesozoic hydrothermal activity associated with the break up of PangaeaEarth Planet. Sci. Lett.681984229239PeabodyC.E.EinaudiM.T.Origin of petroleum and mercury in the Culver-Baer cinnabar deposit, Mayacmas districtCalifornia, Econ. Geol.87199210781104CameronE.M.JonassonI.R.Mercury in Precambrian shales of the Canadian SheildGeochim. Cosmochim. Acta3619729851005Hernandez SobrinoA.Estructura y génesis de los yacimientos de mercurio de la zona de AlmadénPh.D. Thesis1984Univ. Salamanca317Supplementary dataSupplementary Document
Dong Hailing
Hall Cris M.
Halliday Alex N.
Higueras Pablo L.
Kesler Stephen E.
No associations
LandOfFree
Dating of alteration episodes related to mercury mineralization in the Almadén district, Spain does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dating of alteration episodes related to mercury mineralization in the Almadén district, Spain, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dating of alteration episodes related to mercury mineralization in the Almadén district, Spain will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1317746