Boletín Geológico最新文献

{"title":"Magnetic and gamma-ray spectrometric airborne geophysical data for investigating potential mineral resources and generating geoscientific knowledge in Colombia","authors":"Ismael Enrique Moyano Nieto, Renato Cordani, Marcela Lara, Ó. Rojas, M. Puentes, D. Ospina, Hernán Arias, Ernesto Gómez, S. Torrado, A. Robayo, G. Prieto","doi":"10.32685/0120-1425/bol.geol.48.spl.1.2021.574","DOIUrl":"https://doi.org/10.32685/0120-1425/bol.geol.48.spl.1.2021.574","url":null,"abstract":"The Servicio Geológico Colombiano has made available several airborne magnetometry and gamma-ray spectrometry datasets. The information was acquired in 15 blocks that cover approximately 520,000 square  kilometers of Colombian territory, representing more than 850,000 linear kilometers of information. The data  were collected along flight lines separated by 500 meters or 1000 meters, depending on the area, with sampling rates of 10 Hz (8 meters) and 1 Hz (80 meters) for the magnetometry and gamma-ray spectrometry  data, respectively. The information is stored in 30 databases separated for each block and for each of the geophysical methods used. The Servicio Geológico Colombiano has provided a web portal that provides  detailed specifications for each database and allows interested parties to see the terms and conditions to  access the datasets and to check possible restrictions on access to information. To date, there is no  geophysical database in Colombia with the coverage and resolution of these data sets, which will be very  useful for geological research and research on potential mineral resources and to support geohazard monitoring, land-use planning and providing a baseline dataset for environmental monitoring. ","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116724658","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}

{"title":"Geological-structural mapping and geocronology of shear zones: A methodological proposal","authors":"Anny Julieth Forero Ortega, Julián Andrés López Isaza, Nelson Ricardo López Herrera, Mario Andrés Cuéllar Cárdenas, Lina María Cetina Tarazona, Luis Miguel Aguirre Hoyos","doi":"10.32685/0120-1425/BOL.GEOL.48.1.2021.524","DOIUrl":"https://doi.org/10.32685/0120-1425/BOL.GEOL.48.1.2021.524","url":null,"abstract":"The deformation registered in rocks in the field can be characterized based on the structures preserved in outcrops, which can related be to wide discontinuity zones named faults and shear zones. The geological-structural mapping and the geochronology of these tectonic structures are a topic of great interest not only for tectonic modeling but also for reconstruction of the geological evolution of the national territory. The methodology suggest for the analysis of faults and shear zones is based on eight steps, including: 1) definition of the geological context in which the structure was developed; 2) photointerpretation, image geoprocessing, and geological-structural mapping of the structural and lithological characteristics of the faults and shear zones; 3) petrographic analysis of field-oriented samples; 4) quantification of strain orientation and geometry through 3D finite strain analyses and quantification of non-coaxiliaty of deformation through vorticity analyses; 5) SEM-TEM-EBSD microanalysis; 6) quantification of the P-T conditions of deformation through phase-equilibria modeling or conventional geothermobarometry; 7) dating of syn-kinematic minerals phases and mylonitic rocks through Ar-Ar analyses, in order to determine the reactivation and deformation ages of the structure, respectively, as well as the implementation of the U-Pb technique in syn-kinematic calcite crystals developed in the fault planes; and 8) dating of geological elements adjacent to the structure, such as syn-kinematic intrusive bodies associated with the deformation event using zircon U-Pb dating, rocks hydrothermally altered through Ar-Ar method, and zircon and apatite fission-tracks dating of the blocks adjacent to the faults for determining exhumation ages.","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125195379","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}

{"title":"Geology of the Frontino-Morrogacho Gold Mining District and Metallogeny of the El Cerro Igneous Complex","authors":"Felipe Arrubla Arango, Sergio Esteban Silva Sánchez","doi":"10.32685/0120-1425/BOL.GEOL.48.1.2021.500","DOIUrl":"https://doi.org/10.32685/0120-1425/BOL.GEOL.48.1.2021.500","url":null,"abstract":"The Frontino-Morrogacho gold district is located on the western flank of the Western Cordillera, NW of Antioquia Province. Gold mineralizations in the area are spatially and genetically associated with the cooling  of three mid- to late-Miocene age intrusive centers in the form of stocks and dikes (12-9 Ma): Cerro Frontino,  La Horqueta and Morrogacho (El Cerro Igneous Complex). These composite magmatic pulses, with  ultramafic to intermediate compositions, vary into diorite-, gabbro- and monzonitic-bearing phases.  Mineralization in the complex is present as several structurally controlled fault veins, shear-related veins,  sheeted quartz extension veins and quartz-carbonate tabular extension veins, with the development of  swarms and nests of veins-veinlets, breccias and stockworks. Structures range from centimeter-wide  individual veinlets to several meter-wide swarms of veins developed within broad mineralized structural  corridors, with a metallic signature that consists of Au + Ag + Cu + Zn + Pb + As (± Te ± Bi ± Sb ± Hg ± W)  assemblages. Veins are composed of multiple stages of mineralization, and the formation of these  structures is enhanced by the presence of a local regime of extension and E-trending structures, including  evidence of faults and shear zones with right-lateral displacement, which are likely involved in pluton  emplacement and cooling. The ore mineralogy is composed of pyrrhotite, pyrite, chalcopyrite, sphalerite,  galena and arsenopyrite assemblages formed in two or more mineralization stages, with complex Bi, Te, Sb  and Hg mineral specimens associated with Au and Ag. Mineralized structures of the district present a preferential E-strike with dominant vertical to subvertical and occasional subhorizontal S-dips and secondary N- and NW-strikes that are steep to vertically E-dipping. \u0000The Frontino-Morrogacho Gold district presents characteristics related to the architecture, mineralogy and  alteration of reduced (ilmenite-series) intrusion-related gold systems but is genetically associated with a  parental oxidized magma source. The gold content is associated with three different families involving electrum, tellurides and alloys: gold rich (66 to 78% Au, 22 to 34% Ag), average (50 to 60% Au, 40 to 50% Ag)  and silver rich (32 to 40% Au, 60 to 68% Ag). The formation of these bodies is associated with an N-S  magmatic-metallogenic trend of Au-Ag-Cu deposits, which extend for more than 300 km along the Western  Cordillera of Colombia. Similar plutonic suites span from the south of Chocó Province to the north of Antioquia Province, which indicates that the Frontino-Farallones-Botón arc can be proposed as an individual  metallogenic belt.","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114392515","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}

{"title":"San José de Guaviare Syenite, Colombia: Repeated Ediacaran intrusions in the northwestern Amazonian Craton","authors":"Carolina Amaya López, Marion Weber Scharff, Mauricio Ibáñez Mejía, Federico Alberto Cuadros Jiménez, Jorge Julián Restrepo Álvarez, N. Botelho, Mario Maya Sánchez, Orlando Manuel Pérez Parra, Carlos Ramírez Cárdenas","doi":"10.32685/0120-1425/BOL.GEOL.48.1.2021.503","DOIUrl":"https://doi.org/10.32685/0120-1425/BOL.GEOL.48.1.2021.503","url":null,"abstract":"The Neoproterozoic igneous rocks found in the municipality of San José del Guaviare include several isolated plutonic bodies that protrude from the Phanerozoic sedimentary cover in belts aligned NW-SE. Limited to the Guaviare department, these intrusions stretch from the La Lindosa mountain range to the corregimiento El Capricho. These plutonic bodies consist of nepheline syeni­tes, nepheline monzosyenites, nepheline-bearing alkali-feldspar syenites, syenites, quartz-syenites, quartz-alkali-feldspar syenites, syenogranites, and quartz-rich granitoids, which have been grouped and termed the San José del Guaviare Syenite unit (SJGS). \u0000The intrusion of the unit occurred in the Ediacaran (604 ± 7 Ma and 620.5 ± 7.5 Ma) by mantle-derived alkaline magmas formed in anorogenic settings, most likely in rift-like stretching zones. The silica-subsaturated magma may have reacted with host rocks at the crust level, producing some silica-saturated igneous rocks, such as syenogranites and quartz-syenites, which are found in the El Capricho and Cerritos bodies.","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125401681","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}

{"title":"Possible hydrogeological and thermal conditions of the Quilmes Tectonic Trough (Buenos Aires Province, Argentina): a working hypothesis","authors":"E. Rossello, G. Veroslavsky, Jorge N. Santa Cruz","doi":"10.32685/0120-1425/BOL.GEOL.48.1.2021.529","DOIUrl":"https://doi.org/10.32685/0120-1425/BOL.GEOL.48.1.2021.529","url":null,"abstract":"The proposal of the Quilmes Tectonic Trough (Fosa tectónica de Quilmes – FQ) as the extension of the southern end of the Santa Lucía basin in Uruguay and its connection to the Salado basin in Argentina suggest the existence of a large sedimentary volume capable of housing a new aquifer on the La Plata River coast. However, the sedimentary volumes that form the FQ are hidden under a thick, recently deposited cover, and thus, there is a lack of studies on the nature of this formation. Nevertheless, the Uruguayan section of the Meso-Cenozoic depocenter of the Santa Lucía basin has been more thoroughly studied for hydrocarbon exploration, which enabled us to estimate the equivalent tectosedimentary characteristics in the FQ. In the Uruguayan territory, three aquifer systems of the Santa Lucía basin are exploited: the Raigón (Plio-Pleistocene) aquifer, which is the most important source of groundwater for various uses in the south-central region of Uruguay, and the Mercedes (Upper Cretaceous) and Migues (Lower Cretaceous) aquifers, which are also used, albeit to a lesser extent, for drinking water, irrigation, and industrial purposes. The Migues aquifer, the least known of the three, shows a variable depth ranging from 100 to 1500 m and considerable stratigraphic sequences of porous and permeable sandstones. These sandstones provide the aquifer with very good qualities as a reservoir rock; as such, the Migues aquifer has been studied for its potential natural gas reserves and geothermal and water resources. Accordingly, if the same sequences with equivalent sedimentary and hydrogeological qualities are present in the FQ, similar aquifers with interesting properties may remain unidentified along the Buenos Aires coast beneath the intensely explored Puelches, Pampeano and Paraná aquifers. In conclusion, specific exploratory activities may prove the existence and quality of these hydrogeological resources, the regional slope toward the southwest from the Uruguayan outcrops, upwelling or semiupwelling conditions and even geothermal energy associated with the deepest cretaceous aquifers.","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132214785","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}

{"title":"Graphical representation of structural data in the field: A methodological proposal for application in deformed areas","authors":"Julián Andrés López Isaza, Mario Andrés Cuéllar Cárdenas, Lina María Cetina Tarazona, Anny Julieth Forero Ortega, Ana Milena Suárez Arias, Oscar Freddy Muñoz Rodríguez, Luis Miguel Aguirre Hoyos, María Juliana Gutiérrez López","doi":"10.32685/0120-1425/BOL.GEOL.48.1.2021.504","DOIUrl":"https://doi.org/10.32685/0120-1425/BOL.GEOL.48.1.2021.504","url":null,"abstract":"The description of the fabric elements represented by the linear and planar structures present at different scales is a key component of fieldwork. A scheme is proposed for the systematic registration of planes and lineations, coded as S (planar surfaces), F (folds), and L (lineations), among others, that allows for the orderly storage of the measurements taken. This scheme includes information related to the kinematics, the kinematic indicators, and the certainty or reliability ascribed to the assigned movement. In the fieldwork, the graphic representation of the structural measures in modified projection nets includes concentric circles for each dip. Direct drawing of the outcrop data is undertaken, dispensing with the use of tracing or transparent paper. The stereograms resulting from the graphic representation in the modified Wulff stereographic projection net, and the modified Schmidt equal-area net, can be complemented by rose diagrams for visualization of the spatial ordering. During field campaigns in the outcrops, it is essential to visualize the spatial orientation of the data in the diagrams to determine the main structural trends, the vergence, the kinematic nature of faults and shear zones, paleo-stress tensors, and to differentiate structural domains, among others. This information supports the reconstruction of geological and tectonic history and the establishment of relationships between the different geological processes.","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117059237","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}

{"title":"Contribución al conocimiento geológico de la Serranía del Perijá mediante cartografía a escala 1:25.000 del Grupo Cogollo, en el sector oriental del municipio de Becerril, Cesar","authors":"Milton David Lozada Molina, Frank David Lascarro Navarro, Luisa Fernanda León Díaz, Elías Ernesto Rojas Martínez, Fabio enrique Carrillo Bolaño, Luis Carlos Tapia Tavera, Dino Carmelo Manco Jaraba","doi":"10.32685/0120-1425/BOLETINGEO.45.2019.487","DOIUrl":"https://doi.org/10.32685/0120-1425/BOLETINGEO.45.2019.487","url":null,"abstract":"In the department of Cesar, Municipality of Becerril, there are extensive outcroppings of Cretaceous rocks with calcareous sequences belonging to the Lagunitas and Aguas Blancas Formations, the Cogollo Group, and the La Luna Formation. This study presents the mapping of a 25 km2 are in the eastern sector of the Municipality of Becerril, intended to contribute geological knowledge of this area through field work, identification of geomorphological units and petrographic descriptions at a scale 1:25,000. The Lagunitas Formation is characterized by a succession of dark gray massive fossiliferous limestone intercalated with calcareous mudstone and lumachellic limestone. From the Aguas Blancas Formation, the Animas Member is identified in detail, consisting of calcareous mudstone with abundant organic matter interbedded with black micritic limestones that grades horizontally to sandstones with fine-grained calcareous cement. The Tucuy Member consists of calcareous siltstone, fine-grained sandstone and carbonated claystone. The Maracas Member consists mainly of massive lumachellic limestone. Similarly, four geomorphological environments were identified: structural, identifying units of hog-backs, homoclinal ridges and cuestas; denudation, identifying units such as erosion scarps, lightly bisected hills and undulating interfluves; karstic, with units of karstic valley and karstic slope; and fluvial, with the floodplain unit.","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115636506","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}

{"title":"Megacircones ediacáricos de la sienita nefelínica de San José del Guaviare y su potencial como material de referencia para datación U/Pb mediante LA-ICP-MS","authors":"Jimmy Alejandro Muñoz Rocha, Alejandro Piraquive, José Alejandro Franco Victoria, Amed Bonilla Pérez, Luz Mary Peña Urueña, Thomas Heinrich Cramer, Lorena del Pilar Rayo Rocha, Nicolás Villamizar Escalante","doi":"10.32685/0120-1425/BOLETINGEO.45.2019.484","DOIUrl":"https://doi.org/10.32685/0120-1425/BOLETINGEO.45.2019.484","url":null,"abstract":"With the aim of expanding the reference materials of the Geochronology Laboratory of the Colombian Geological Survey (LG-SGC, in Spanish), zircons were collected from the nepheline syenite of San Jose del Guaviare, Jordan locality (Colombia). The SNG-1 sample was composed of 24 zircons selected from the fraction between 2 and 5 millimeters long, which were mounted and polished in an epoxy resin block. The zircons were dated by analyzing the isotopic ratios of uranium and lead using the LA-ICPMS method. In the LG-SGC, 92 points on the zircons were selected for analysis, and at the University of Rennes in France (LG-URF), 24 points from crystals found nearby were selected for analysis from a previous cathodoluminescence study. Concordant ages for the zircons for both laboratories corresponded to a crystallization age of 608 ± 1.2 Ma and 602 ± 3 Ma, respectively, which differ by less than 1% despite the difference in instrumentation and analytical procedures. For systematic error correction and quality control, international reference material, such as Plesovice, GJ-1, FC-5 Duluth and Mount Dromedary zircon, was used. The uncertainties generated during the analyses are similar (1.2 and 3.2 Ma), and the mean square-weighted deviation (MSWD) of the concordia diagrams was < 1 in both cases, indicating low dispersion of the results. Some discordant ages show that the U/Pb ratios are not uniform, as expected for a primary reference material. However, we believe that the zircons of the Jordan syenite have potential use as a secondary reference material for the LG-SGC provided they are carefully selected and prepared, their geochemical content (including rare earth elements, REE) is characterized, and quality monitoring of U/Pb dating is performed, as these zircons are large, reaching up to 4 cm, abundant, and possible to collect in the Colombian territory.","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124423660","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}

{"title":"Notas sobre el contexto tectonoestratigráfico de formación de las esmeraldas colombianas","authors":"R. Melo","doi":"10.32685/0120-1425/BOLETINGEO.45.2019.486","DOIUrl":"https://doi.org/10.32685/0120-1425/BOLETINGEO.45.2019.486","url":null,"abstract":"The geological explorations carried out by the Colombian Geological Survey (SGC, in Spanish) between 2005 and 2008 show that the potential areas for exploration and exploitation of emeralds in the Western Emerald Belt (CEOC, in Spanish) are closely related to the Muzo (Hauterivian-Barremian age) and Rosa Blanca (Valanginian age) geological formations, and in the Eastern Emerald Belt (CEOR, in Spanish), are associated to the Santa Rosa and Chivor formations (Berriasian age). Mineralization is associated with various mesoscopic tectonic structures with hydrothermal alteration.","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"282 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131744178","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}

{"title":"Análisis de anomalías geobotánicas a partir del procesamiento e interpretación de productos de sensores remotos, estudio de caso: occidente de Boyacá (Colombia)","authors":"Manuel Guillermo Zafra Dulcey","doi":"10.32685/0120-1425/BOLETINGEO.45.2019.485","DOIUrl":"https://doi.org/10.32685/0120-1425/BOLETINGEO.45.2019.485","url":null,"abstract":"This work presents the boundaries of a new area of interest for the detailed exploration of emeralds in Colombia, identified through the interpretation of geobotanical anomalies in areas of dense vegetation. A methodology was designed in which fifteen vegetation indices were calculated. The anomalies correlated most with the lineaments detected from the interpretation of a shaded-relief model generated from a digital terrain model (DTM) were selected. A detailed spectral analysis in the mineralized zones of the area with the highest correlation showed a halo of vegetative stress in all studied cases; moreover, the analysis corroborated a direct relationship between the albitization present in the mineralized zones, the lineaments and the degree of vegetative stress. A sector between the Coscuez mine and the La Pita mine was identified as a target for detailed exploration, where the vegetation indexes indicate less vegetative stress and correlate better with the natural terrain lineaments. It was found that the proposed methodology based on geobotanical anomalies yields consistent results and can be used as a tool for emerald exploration.","PeriodicalId":124675,"journal":{"name":"Boletín Geológico","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121537262","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}