Geogaceta最新文献_第9页

A review of U-Pb detrital zircon systematics from Cambrian- Lower Devonian rocks of the Moroccan Meseta 摩洛哥梅塞塔寒武系-下泥盆纪岩石U-Pb碎屑锆石系统学研究综述

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99840

Cristina Accotto, D. Martínez Poyatos, A. Azor, A. Jabaloy‐Sánchez

{"title":"A review of U-Pb detrital zircon systematics from Cambrian- Lower Devonian rocks of the Moroccan Meseta","authors":"Cristina Accotto, D. Martínez Poyatos, A. Azor, A. Jabaloy‐Sánchez","doi":"10.55407/geogaceta99840","DOIUrl":"https://doi.org/10.55407/geogaceta99840","url":null,"abstract":"U-Pb geochronological analysis of detrital zircon grains is a powerful tool to decipher the pre-Mesozoic paleogeography. In this work, we present a sediment provenance study based on a compilation of 41 Cambrian-Early Devonian siliciclastic samples from the Moroccan Meseta. All of them are characterized by late Tonian-Ediacaran (c. 600 Ma, c. 50% of the data), Rhyacian-Orosirian (c. 2100 Ma, c. 20% of the data), and Neoarchean (c. 2500 Ma, c. 4% of the data)detrital zircon age populations indicating a strong West African Craton affinity. Minor populations are: (i) Cambrian-Ordovician (c. 500 Ma), particularly relevant in Lower Ordovician samples, which were probably sourced by local volcanic centers formed during an aborted rift; (ii) Stenian-early Tonian (c. 1000 Ma); and (iii) Orosirian-Statherian (c. 1800 Ma). These two latter populations were probably fed by paleocurrents from NE-African regions (e.g., Sahara Metacraton and Arabian-Nubian Shield) that reached only intermittently the studied area. Finally, the spatial and chronological distribution of the detrital zircon age populations suggests that the tectonic boundaries normally used to separate internal subdomains in northern Morocco did not imply far-travelled terranes during early-middle Paleozoic times.","PeriodicalId":37493,"journal":{"name":"Geogaceta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46098619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heterogeneidad del acuífero de la Vega de Granada en el entorno urbano de Granada (España) 格拉纳达（西班牙）城市环境中格拉纳达织女星含水层的异质性

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99832

Virginia María Robles-Arenas, José Benavente Herrera, C. Almécija

引用次数: 0

Control estructural de los filones de cuarzo en el Dominio Central del Sistema Central Hispano-Portugués: propuesta de un evento tectono-hidrotermal de edad Oligoceno-Mioceno Medio 西班牙-葡萄牙中央系统中心域石英脉的结构控制：渐新世-中新世构造-热液事件的建议

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99839

Daniel Bermejo-López, L. Ortega, Gerardo De Vicente

引用次数: 0

Quantitative texture analysis of slates: An insight into slate’s elastic properties and their contribution to the understanding of seismic wave reflections in anisotropic materials 板岩的定量纹理分析：深入了解板岩的弹性特性及其对理解各向异性材料中地震波反射的贡献

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99820

Saúl Álvarez Arias, Juan Gómez Barreiro, Imma Palomares, Juan Morales Sánchez-Migallón

{"title":"Quantitative texture analysis of slates: An insight into slate’s elastic properties and their contribution to the understanding of seismic wave reflections in anisotropic materials","authors":"Saúl Álvarez Arias, Juan Gómez Barreiro, Imma Palomares, Juan Morales Sánchez-Migallón","doi":"10.55407/geogaceta99820","DOIUrl":"https://doi.org/10.55407/geogaceta99820","url":null,"abstract":"Slates are low-grade metamorphic rocks characterized by an alignment of the phyllosilicates, resulting in the development of a marked foliation. A consequence of this is a strong directional dependence of their elastic properties, which are tightly bound to their texture. The Rietveld analysis applied to synchrotron x-ray diffraction images of slates from the Truchas Syncline (NW Iberian Peninsula) will provide us with the orientation distribution function (ODF) of the principal minerals that constitute the rock. This textural analysis shows an exceptional alignment of phyllosilicates (muscovite and chlorite) in contrast with a poor orientation of other minerals such as quartz. In a later treatment of the data, the elastic properties of the slates, as well the variations of the seismic wave velocities, have been calculated from the ODF and the single crystal stiffness tensors. The results of both the elastic properties and the wave velocities can be used for the construction of models that allow to understand the reflections of seismic waves in markedly anisotropic materials, which is a matter of a great interest in the studies of the Earth’s lithosphere with seismic methods.","PeriodicalId":37493,"journal":{"name":"Geogaceta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49491175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aplicación de la geoquímica ambiental a la gestión de aguas enriquecidas en selenio en explotaciones auríferas subterráneas 环境地球化学在地下金矿富硒水管理中的应用

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99926

D. Baragaño, E. Berrezueta, E. Fernández, J. L. Gallego

{"title":"Aplicación de la geoquímica ambiental a la gestión de aguas enriquecidas en selenio en explotaciones auríferas subterráneas","authors":"D. Baragaño, E. Berrezueta, E. Fernández, J. L. Gallego","doi":"10.55407/geogaceta99926","DOIUrl":"https://doi.org/10.55407/geogaceta99926","url":null,"abstract":"La mineralización de oro en el yacimiento El Valle (Asturias, España) corresponde a dos tipos diferentes de skarn (cálcico y magnésico). En este yacimiento, el Se es un elemento traza presente en la mineralización, y se ha observado que el agua drenada de la actividad minera presenta concentraciones anómalas de este metaloide. En este trabajo se aborda minimizar la presencia de Se en el agua a partir una caracterización exhaustiva del sistema agua-roca a través de una caracterización geoquímica y mineralógica de muestras procedentes de sondeos de drenaje. Los resultados verificaron la presencia de Se en la mineralización. Durante la ejecución de los sondeos, no se detectó presencia de agua al atravesar los materiales del skarn. Sin embargo, las pruebas de lixiviación con agua destilada sobre el skarn magnésico, mostraron una elevada movilidad del Se, al contrario de lo ocurrido en el caso del skarn cálcico. Por otra parte, durante la perforación de la caliza, se detectó presencia de aguas enriquecidas en Se. En consecuencia, se propuso un sistema de impermeabilización para evitar las interacciones agua-roca en los materiales de la mineralización y en las zonas de caliza que presenten fracturas con mineralización diseminada.","PeriodicalId":37493,"journal":{"name":"Geogaceta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43412196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aguas subterráneas fósiles ligadas a acuíferos costeros

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99831

F. Sola, Luis Molina, Ángela Vallejos

引用次数: 0

Capacidad amortiguadora de la contaminación minera en los sedimentos holocenos del estuario del Guadiana (SW España) 西班牙西南部瓜迪亚纳河口全新世沉积物中采矿污染的缓冲能力

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99841

Angel Moreno-Moreno, Joaquín María Delgado Rodríguez, Cinta Barba-Brioso, José Miguel Nieto-Liñán

引用次数: 0

Gravimetric and magnetic characterization of structural controls on Sn-W ore deposits. A case study in the san finx deposit (A Coruña) 锡钨矿床构造控制因素的重磁特征。san finx矿床的案例研究(A Coruña)

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99829

Alberto Santamaría Barragán, P. Ayarza Arribas, J. Alcalde, E. Saura, David Martí Linares, Imma Palomares, J. Élez

引用次数: 0

Nuevos fósiles del Pragiense (Devónico Inferior) del Geoparque Mundial de la UNESCO Montañas do Courel (Lugo, NO de España) y sus implicaciones geológicas 联合国教科文组织库雷尔山世界地质公园（卢戈，不是西班牙）Pragiense（下泥盆纪）的新化石及其地质意义

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99818

Xosé Carlos Barros Lorenzo, J. C. Gutiérrez-marco, P. Cózar, O. Vinn, D. Ballesteros, Ramón Vila, Martín Alempere

{"title":"Nuevos fósiles del Pragiense (Devónico Inferior) del Geoparque Mundial de la UNESCO Montañas do Courel (Lugo, NO de España) y sus implicaciones geológicas","authors":"Xosé Carlos Barros Lorenzo, J. C. Gutiérrez-marco, P. Cózar, O. Vinn, D. Ballesteros, Ramón Vila, Martín Alempere","doi":"10.55407/geogaceta99818","DOIUrl":"https://doi.org/10.55407/geogaceta99818","url":null,"abstract":"Se presentan los primeros fósiles devónicos reconocidos en el sinclinorio del Sil (Lugo, NO de España), encontrados en rocas calcáreas incluidas en un contexto local cartografiado como pizarras ordovícicas, lo que sugiere la necesidad de abordar una investigación estructural y estratigráfica más detallada. El yacimiento paleontológico se vincula con calizas que contienen una acumulación excepcional de dacrioconáridos aparentemente monoespecífica, un grupo fósil que se reconoce por vez primera en Galicia. La identificación de Nowakia cf. acuaria (Richter) permite atribuir al Pragiense el afloramiento estudiado, y correlacionarlo tentativamente con la parte más alta de la Formación Salas en sus afloramientos del extremo oriental del sinclinorio, ya en la provincial de León. Una interpretación alternativa sería considerar a esta caliza como un olistolito en la base del olistostroma + flysch carbonífero de San Clodio. Atendiendo al interés científico de tipo paleontológico, estratigráfico y estructural, la localidad ha sido inscrita como nuevo Lugar de Interés Geológico del Geoparque Mundial de la UNESCO Montañas do Courel.","PeriodicalId":37493,"journal":{"name":"Geogaceta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44411851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the efficiency of wide-angle seismic data inversion through a nonlinear algorithm: case study of the MARCONI-3 profile 利用非线性算法提高广角地震资料反演效率——以MARCONI-3剖面为例

Geogaceta Pub Date : 2022-06-06 DOI: 10.55407/geogaceta99821

A. Olivar-Castaño, I. DeFelipe, M. Pilz, M. Ruiz, R. Carbonell

引用次数: 0