Person: Bustillo Revuelta, Manuel
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First Name
Manuel
Last Name
Bustillo Revuelta
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Mineralogía y Petrología
Area
Petrología y Geoquímica
Identifiers
4 results
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Now showing 1 - 4 of 4
Item Sedimentology and geochemistry of carbonates from lacustrine sequences in the Madrid Basin, central Spain(Chemical geology, 1995) Calvo Sorando, José Pedro; Jones, B.F.; Bustillo Revuelta, Manuel; Fort González, Rafael; Alonso Zarza, Ana María; Kendall, C.Lacustrine and alluvial carbonate facies have been investigated in Middle Miocene successions of the western side of the Madrid Basin in order to evaluate paleoenvironments in which carbonates formed. Carbonate facies are varied and include: ( 1) calcrete and dolocrete; (2) pond deposits; (3) lake margin dolostone; (4) mudflat carbonate; and (5) open-lake carbonate facies. The dominant mineralogy of these is dolomite and/or low-Mg calcite. No high-Mg calcite or aragonite have been detected in any sample. ð18 O- and ð13 C-values range from - 8.20 to - 1.80‰ PDB and - 10.25 to -0.70‰ PBD, respectively. More negative 8 18 O- and 8 13 C-values correspond to predominantly calcite calcretes and to carbonate deposited in ponds at the foot of arkosic alluvium. Higher ð18 O-values are from both lacustrine carbonate and dolocrete. This latter lithofacies has strong geochemical similarities to dolostones deposited in a lake margin environment. Mudflat carbonate, deposited on shallow platforms subject to lake water oscillation, shows great heterogeneity in both stable isotope value and trace-element content. The mineralogy of these carbonates is dominated by calcite and the limestones contain molds of gypsum. Occurrence of calcitized dolomite textures in these facies suggests the influence of fresher water during expanding lacustrine cycles or further interaction with less saline groundwater. Trace-element contents are considered to be potential indicators of the different carbonate facies types, thus aiding the paleoenvironmental interpretation. However, discrimination among carbonate facies on the basis of trace-element contents appears to be dependent on the statistical method utilized for treatment of data. More information is needed to ascertain their use as paleoenvironmental indicators.Item Silicificación y dolomitización de nódulos de anhidrita en sedimentos litíticos continentales. Un caso particular de diagénesis meteórica en el Triásico de la Cordillera Ibérica(Geotemas, 2001) Alonso Zarza, Ana María; Sánchez Moya, Yolanda; Bustillo Revuelta, Manuel; Sopeña Ortega, Alfonso; Delgado Huertas, AntonioCauliflower nodules occur in a red mudstone bed of the Buntsandstein facies of the Iberian Ranges. They consist mostly of quartz, dolomite and calcite, but barite, kaolinite and iron oxides-hydroxides are also present. The nodules are spherical, ovoid or elongated in shape and range from I to 8 cm across. Their surface is irregular and some show a pedogenic carbonate coating. The initial anhydrite nodules formed through a progressive increase in the concentration of Ca+2 and S 0 42 in the meteoric porewaters in a superficial vadose environment. Partial replacement of the anhydrite by megaquartz occurred under more dilute conditions. From this point forward, the evolution of nodules followed two paths. In type A nodules, the dissolution of the anhydrite was complete, and quartz cements filled the porosity. In type B nodules, the dissolution of the anhydrite was incomplete, inhibiting quartz cementation and allowing dolomitization, which was mainly driven by sulphate reduction, indicated by the presence o f bacteria within the dolomite crystals. Dedolomitization, fracturation and precipitation of barite, kaolinite and calcite spar cements occurred later under the influence of meteoric solutions. The presence of these nodules not only reveals a complex meteoric diagenetic history but is also indicative of palaeogeographic and palaeoclimatic conditions.Item Morfología de cristales de dolomita en dolocretas y depósitos lacustres del Cenozoico de las Cuencas de Madrid y de Almazán(Geotemas, 2016) Huerta, P.; Casado Gómez, A.; Bustillo Revuelta, Manuel; Armenteros Armenteros, Ildefonso; Alonso Zarza, Ana MaríaEste trabajo describe morfologías de cristales de dolomita, observados tanto en microscopio petrográfico como electrónico, de dolocretas y de depósitos carbonático-evaporíticos de ambientes lacustres someros, tanto del Paleógeno de la Cuenca de Almazán como del Mioceno de la Cuenca de Madrid. Se han identificado 6 morfotipos: 1)Tubos de dolomita; 2) Cilindros de dolomita vacuolar; 3) Romboedros de dolomita; 4) Cristales de dolomita esferoidal; 5) Cristales de dolomita con forma de capullo; y 6) Dolomita en mancuerna. Las morfologías dominantes en dolocretas son los romboedros, los esferoides, y las mancuernas. Por otro lado, en los depósitos lacustres la variedad de morfologías es mucho mayor, siendo las más comunes: los tubos, los cilindros de dolomita vacuolar, los esferoides y los cristales de dolomita con forma de capullo. La morfología de los cristales de dolomita puede ser un indicador de procesos bióticos o abióticos en su precipitación, aunque han de tenerse en cuenta otros indicadores para comprender la influencia de dichos procesos.Item Neoformaciones y reemplazamientos en depósitos palustres de la Unidad Intermedia (NE de la Cuenca de Madrid)(Geotemas, 2004) Pérez Jiménez, José Luis; Bustillo Revuelta, Manuel; Alonso Zarza, Ana MaríaThe NE zone of the Madrid Basin contains palustrine deposits of the Miocene Intermediate Unit which have undergone silicification processes. These processes are conditioned by the type of palustrine deposit within they developed and occur at specific stratigraphic positions in the basin. In this paper we analyze three different sectors. In the Yesares section silicification produced quartz and took place in gypsum deposits which contain bioturbation channels that favoured silica fixation. In the Brihuega area silicification on bioturbated palustrine micrites also produced quartz. Both silicifications appear at the top of unit or sequence of the Intermediate Unit. In the Jadraque section the silicification of the micrites and dolomicrites was controlled by the presence of biosiliceous marls and sepiolite. This silicification was consequence of early diagenesis.