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Adriana C.G.M.,Central University of Venezuela | Marlys De Los A.R.M.,Central University of Venezuela | Jimenez Y.,Instituto Nacional Of Geologia Y Mineria Ingeomin | Rodriguez R.,Instituto Nacional Of Geologia Y Mineria Ingeomin | And 4 more authors.
Revista de la Facultad de Ingenieria | Year: 2014

This paper presents a geochemical and mineralogical study of heavy minerals collected in the north-west Bolivar state river basins (Aro, Pao, Cuchivero, Guaniamo, Suapure, Parguaza y Cataniapo) in order to locate and delimit areas of interest for mining exploration. Chemical analysis were performed by using the Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) technique for major and minor elements (SiO2, Al2O3, Fe2O3, MgO, CaO, Na2O, K2O, TiO2, P2O5, MnO) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) technique for trace elements (Y, Zr, Nb, Hf, La, Ce, Nd, Th, U, Cr). The statistical treatment applied was Exploratory Data Analysis (EDA). The results obtained allowed generating the geochemical maps and locating the anomalies. Mineralogical analysis was performed by using the X-Ray Diffraction (XRD) technique for the anomalous samples. The results allowed dividing the study area into four anomalous zones. Zone A had anomalous values in the elements Cr, Y, La, Ce, Nd, Th, U, P2O5 and high concentrations in Fe2O3 and TiO2 whereas mineralogical analysis showed as potential mineral phases: ilmenite, magnetite, chromite, hematite and ilmenorutile. Zone B with anomalies in Zr, Hf, and U and high concentrations of Nb, TiO2 and Fe2O3 with suggested phase minerals: ilmenite and zircon. Zone BI with anomalies in MnO, and the mineral phases presented were Mn-rich ilmenite, hematite and magnetite. Finally Zone BII with anomalous values in Y, La, Ce, Nd, Th, U, P2O5 and high concentrations of Zr, Hf, Nb TiO2 y Fe2O3; las fases minerales identificadas en esta zona son monacita, ilmenita rica en Mn e ilmenita.


Medina G. D.,Instituto Nacional Of Geologia Y Mineria Ingeomin | Valladares R.,Instituto Nacional Of Geologia Y Mineria Ingeomin | Pimstein L.,University of Los Andes, Colombia | Quinones E.,University of Los Andes, Venezuela
Revista Geografica Venezolana | Year: 2013

The research carried out within the project entitled "Integrated risk management in urban areas" had as one of its key objectives to map susceptibility to landslides, which resulted from the integration of six conditioning variables of stability. In this paper the thickness of residual soil and colluvium variable is shown. This topic represents a novel proposal to be included within the susceptibility maps as it allows mapping the areal distribution of soil thickness in situ and colluviums located on hillsides, relating it proportionally to the increase or decrease in mass movements. From this methodology, which involves the distribution of thicknesses from geostatistical processing of reliable hard data, four ranges of thicknesses were identified: Range1 (0 to 2.9 m), Range 2 (of 3 to 5.9 m), Range 3 (6 to 7.9m) and rank 4 (> 8 m).


David M.G.,Instituto Nacional Of Geologia Y Mineria Ingeomin | Ninfa M.,Instituto Nacional Of Geologia Y Mineria Ingeomin | Zoila M.,University of Los Andes, Venezuela | Laura P.,University of Los Andes, Venezuela
Revista Geografica Venezolana | Year: 2012

The investigation carried out within the urban development project "Ciudad Camino de Los Indios" had like objective the elaboration of a susceptibility map to mass movements, which results from the integration of five variable of stability: slope, vegetation, geomorphology, kinematic and surperficial lithologic units. For purposes of the article will present one of the main variables used, map of surperficial lithologic units. This map represents a proposal to be included within the maps of susceptibility, since it allows to charting the areal distribution of geologic materials based on their physico-geomechanical condition not considerate in classical analysis. In accordance with this new methodology, which involves: resistance, degree of fracturing, weathering and geomechanical behavior of materials, it was determined four units: hard weathered fractured rock (Rmdf), fractured fresh rock hard (RFdf), highly weathered rock hard fractured (RMmdf), decomposed rock and/or soil residual (RD). © 2002-2007 MIT.

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