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Browsing Earth Sciences Research Journal by Title
Now showing items 195-214 of 373
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Macro-Micromechanical Properties of Sandy Pebble Soil of Different Coarse-Grained Content
Sandy pebble stratum is a typical discrete particle unstable stratum, mainly consisting of sand and pebble. However, the effect of coarse-grained content on the stability of stratum is not clear. This paper defined the ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Maestría en geofísica, una nueva opción en las geociencias
EI devenir de las ciencias es mas complejo que lineal. Las Geociencias en Colombia, siguiendo esta hipótesis, han tenido un desarrollo de ires y venires. La lógica pareciera ser que se deberían tener primero carreras en ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Magmatic Evolution and Compositional Characteristics of Tertiary Volcanic Rocks Associated with the Venarch Manganese Mineralization, Sw Qom, Central Iran
The manganese (Mn) deposits of Iran date from late Proterozoic to Pliocene but the major high-grade Mn ore deposits are associated with tertiary basic to intermediate volcanic rocks. The Venarch Mn deposit is located in ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Magnetic and palaeomagnetic studies as an aid in deciphering groundwater flow: a case study from deccan traps
This paper reports the utility of palaeomagnetic investigations first time in the ground water studies. The magnetic anomalies along with palaeomagnetic studies are used to locate barriers obstructing groundwater flow in ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Manifestaciones del diapirismo arcilloso en el margen colombiano del caribe
Utilizando cánones de agua y ecosondas de 3.5 KHz, se tomaron nueve perfiles sísmicos que cubren aproximadamente 1.500 km lineales de información. Se observan variadas manifestaciones del diapirismo arcilloso, que se han ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Mapping high-angle basement faults in the middle benue trough, nigeria from gravity inversion surface
High-angle faults appear as vertical off-sets on a topographic surface including that derived through the inversion of gravity data. In this study of the middle Benue trough, Nigeria, gravity data for the area was bandpass ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Mapping of Underwater Seabed Morphology of the Gaza Strip Coastal Zone Using Remote Sensing Technique
The study investigated the feasibility of applying the depth-invariant index algorithm to delineate the shallow underwater geomorphological features using QuickBird imagery. Although the technical procedures of the depth ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Mapping subsurface formations on the eastern red sea coast in jordan using geoelectrical techniques: geological and hydrogeological implications
During 2006, geoelectrical measurements using the vertical electrical sounding (VES) method were conducted on the eastern Red Sea coast in Jordan, using the SYSCAL-R2 resistivity instrument.The objectives of the study were ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Material assimilation in a shallow diapiric forceful intrusion: evidence from microstructures and csd analysis in a porphyritic intrusive body, “la línea” tunnel, central cordillera, colombia
The contact between the unit Porphyry Andesite and the Cajamarca Group is observed in the "Túnel de la Linea" section. The integration of petrographic, geochemical and textural (crystal size distribution, CSD) analysis allows ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Mean velocity and suspended sediment concentration profile model of turbulent shear flow with probability density function
This work purposes a general mean velocity and a suspended sediment concentration (SSC) model to express distribution at every point of the cross section of turbulent shear flow by using a probability density function ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Medida de propiedades dinámicas de rocas "in situ" y computo de parámetros elastomecánicos
Se presentan sintéticamente los fundamentos de la teoría elastomecánica, con definiciones y principales sistemas de unidades. Se discuten algunos de los problemas de adquisición de datos de ondas P y S y se muestran los ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Mesozoic magmatism in east uruguay: petrological constraints related to the sierra san miguel region
This work presents new results of a detailed geological and structural investigation focusing the easternmost Uruguayan Mesozoic magmatic occurrences related to the south Atlantic opening. Lithological descriptions, their ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Metal speciation in sediments from crude oil prospecting in the coastal area of ondo state, nigeria
Information obtainable from metal speciation is far more valuable with respect to bioavailability, toxicity and fate of metals than information from total metal data. Therefore, metal speciation on sediment to assess the ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Metallogenic Dynamics Background of Ga’erqiong Cu-Au Deposit in Tibet, China
The Ga’erqiong Cu-Au deposit, which sits on the north side of the Coqên-Xainzamagmatite belt, is a large-scale skarn-type deposit, whose ore body has formed in the skarn zone in the contact part of quartz diorite and marble ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Methodology implemented for the 3d-seismic modelling using gocad and norsar 3d software applied to complex areas in the llanos foothills
A methodology has been applied in order to use seismic modeling and generate synthetic data which are compared with results from field data. This methodology has been applied to the Sirirí area andsubsequently it has been ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Migración mediante apilado por difracción en medios con gradiente constante de velocidad
Para investigar la reflectividad en el subsuelo de la Tierra por métodos sísmicos, se necesita introducir algunas suposiciones acerca del macromodelo de velocidades para la capa suprayacente al reflector. Esto se logra al ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Migration of local earthquakes in the gulf of aqaba, north red sea
ABSTRACTThe Gulf of Aqabah has been considered one of the most seismically-active regions in the Middle East during the last 15 years; a catalogue of 1,415 earthquakes (duration magnitude Md and gt; 2. 8) during 19851995, ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Mineralization controls and petrogenesis of the rare metal pegmatites of nasarawa area, central nigeria
The pegmatites of Nasarawa area occur in the central part of Nigeria. They are mainly hosted by phyllonites in a NNE-SSW trending shear zone lying east of some foliated Pan-African and West of Jurassic Afu Complex Younger ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Mineralization potentials of pegmatites in the nasarawa area of central nigeria
Pegmatites in Nasarawa area of Central Nigeria lie within a fracture-controlled east-north-east trending rare metal pegmatite belt closely associatedwith late PanAfrican peraluminous granites inNigeria. Trace elements of ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Modelación del problema inverso en geoeléctrica 2d mediante elementos finitos
Se plantea un modelo numérico para la solución del problema inverso en geoeléctrica 2D utilizando el método de los elementos finitos. La metodología de solución se fundamenta principal mente en dos procedimientos: a) ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal.
