Javier García‐Veigas

Universitat de Barcelona

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Diοni I. Cendón

Australian Nuclear Science and Technology Organisation

Federico Ortı́

Universitat de Barcelona

Laura Rosell

Universitat de Barcelona

Tim K. Lowenstein

Binghamton University

Luís Gibert

Universitat de Barcelona

David Artiaga

Universitat de Barcelona

Cahit Helvacı

Dokuz Eylül Üniversitesi Hastanesi

Carlos Ayora

Institute of Environmental Assessment and Water Research

Elisabet Playà

Universitat de Barcelona

Mebrahtu F. Weldeghebriel

Binghamton University

Cooperative Institutions

Universitat de Barcelona

Universidad de Granada

Consejo Superior de Investigaciones Científicas

Hebrew University of Jerusalem

Geological Survey of Israel

Universidad de Murcia

Binghamton University

FC Barcelona

Columbia University

Geociencias Barcelona

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New 40Ar/39Ar radiometric ages of lamproites indicate latest Tortonian marine restriction of the Fortuna Basin, Eastern Betics, southern Spain

Evolving Earth (2023)

Luís Gibert Alan L. Deino Ariana Carrazana David Cruset Elisabet Playà

Exposures of lamproitic volcanic rocks have been used to constrain the age of the evaporitic basin-fill in the Fortuna Basin of southern Spain. K/Ar dates initially suggested a Messinian age assignment for these deposits; however, subsequent 40Ar/39Ar dates indicated a Tortonian age, implying the early onset of evaporite formation in the eastern Betic Cordillera, in an event termed the "Tortonian Salinity Crisis". In this paper, we critically review the published chronology of the key igneous outcrops and provide new 40Ar/39Ar ages, which show that the Cabezos Negros lamproites lie close to the Tortonian-Messinian boundary (c. 7.25 Ma). We also provide new paleomagnetic measurements from each of the three lamproitic outcrops (Cabezos Negros, Derramadores, and El Tale), which demonstrate normal magnetic polarity coincident with episodes of volcanic and subvolcanic activity. The presence of peperites and pillow structures indicate that volcanism at Cabezos Negros was coeval with deposition of the lower part of Rambla Salada Gypsum Member. Therefore, the normal polarity identified in this unit should be equivalent to the normal polarity on the Cabezos Negros lamproites. These results indicate that the initial marine restriction and evaporitic deposition of Fortuna Basin occurred more than a million years before the Messinian Salinity Crisis.

Outcrop

Radiometric dating

10.1016/j.eve.2023.100001

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SULFATEISOTOPECOMPOSITIONS (δ 34 S, δ 18 O) AND STRONTIUM ISOTOPIC RATIOS ( 87 Sr/ 86 Sr) OF TRIASSIC EVAPORITES IN THE BETIC

Federico Ortı́Alberto Pérez‐López Javier Garcı́a-Veigas Laura Rosell Dionisio I. Cendón

Sulfate isotope compositions (δ 34 S and δ 18 O) and strontium isotope ratios ( 87 Sr/ 86 Sr) of Tri- assic evaporites in the Betic Cordillera are addressed for the first time in the present work. Isotope val- ues have been determined in gypsum and anhydrite samples of the Germanic-type facies (Buntsandstein, Muschelkalk and Keuper) coming from different outcrops spanning the complete Triassic Period and cor - responding to both the Internal Zones and the External (Prebetic, Subbetic) Zones of this chain. More precise age assignments and stratigraphic controls are often obscured because of the intense halokinetic and tectonic deformation occurred during the Alpine Orogeny in the Betic Cordillera. Isotope values of Triassic sulfates obtained in the present study range between 12.5 and 16.6 ‰ for δ 34 S, between 8.9 and 16.9 ‰ for δ 18 O, and between 0.707615 and 0.708114 for 87 Sr/ 86 Sr. These values, as a whole, are in

Isotopes of strontium

Anhydrite

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Orogeny

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Glauberite–halite association of the Zaragoza Gypsum Formation (Lower Miocene, Ebro Basin, NE Spain)

Sedimentology (2006)

Josep Maria Salvany Javier Garcı́a-Veigas Federico Ortı́

Abstract Glauberite is the most common mineral in the ancient sodium sulphate deposits in the Mediterranean region, although its origin, primary or diagenetic, continues to be a matter of debate. A number of glauberite deposits of Oligocene–Miocene age in Spain display facies characteristics of sedimentologic significance, in particular those in which a glauberite–halite association is predominant. In this context, a log study of four boreholes in the Zaragoza Gypsum Formation (Lower Miocene, Ebro Basin, NE Spain) was carried out. Two glauberite–halite lithofacies associations, A and B, are distinguished: association (A) is composed of bedded cloudy halite and minor amounts of massive and clastic glauberite; association (B) is made up of laminated to thin‐bedded, clear macrocrystalline, massive, clastic and contorted lithofacies of glauberite, and small amounts of bedded cloudy halite. Transparent glauberite cemented by clear halite as well as normal‐graded and reverse‐graded glauberite textures are common. This type of transparent glauberite is interpreted as a primary, subaqueous precipitate. Gypsum, thenardite or mirabilite are absent in the two associations. The depositional environment is interpreted as a shallow perennial saline lake system, in which chloride brines (association A) and sulphate–(chloride) brines (association B) are developed. The geochemical study of halite crystals (bromine contents and fluid inclusion compositions) demonstrates that conditions for co‐precipitation of halite and glauberite, or for precipitation of Na‐sulphates (mirabilite, thenardite) were never fulfilled in the saline lake system.

Halite

Anhydrite

10.1111/j.1365-3091.2006.00844.x

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Citations (89)

No sedimentary evidence for hydrothermal refugia in the Plio-Pleistocene deposits of the Baza Basin (SE Spain)

Quaternary Science Reviews (2015)

Luís Gibert Carles Ferràndez‐Cañadell Javier Garcı́a-Veigas G. R. Scott

Peninsula

Aridity index

Mediterranean Basin

10.1016/j.quascirev.2015.01.014

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Citations (12)

Geochemical indicators in Western Mediterranean Messinian evaporites: Implications for the salinity crisis

Marine Geology (2018)

Javier Garcı́a-Veigas Diοni I. Cendón Luís Gibert Tim K. Lowenstein David Artiaga

Anhydrite

δ34S

Halite

10.1016/j.margeo.2018.06.005

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Citations (40)

Sulfate isotope composition of Messinian evaporites in the Piedmont basin (Italy)

Geogaceta (2023)

Javier Garcı́a-Veigas Luís Gibert Diοni I. Cendón Francesco Dela Pierre Marcello Natalicchio

The Piedmont basin (NW Italy) records a Messinian Salinity Crisis (MSC) succession including a selenite gypsum deposit assigned to the Primary Lower Gypsum (PLG, MSC stage 1). Strontium isotope ratios are in the range of the PLG deposits of the Mediterranean area. Sulfate isotope compositions of vertically oriented selenite gypsum beds, in the lower part of the succession, are similar to those reported in other PLG deposits. However, flattened branching selenite cones in the upper part show higher isotope compositions, mainly in δ34S values, suggesting intense BSR conditions, stronger than reported in other PLG deposits. We interpret this chemical shift during deposition of the upper part of the PLG as the result of increased marine restriction assisted by the marginal position of this basin in the Adriatic Gulf during the Apennine and Alpine uplifts.

δ34S

Isotopes of strontium

Mediterranean Basin

10.55407/geogaceta102282

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Citations (1)