Papers by Alvaro Bryan Quispe Márquez
Groundwater is the main water resource in La Gomera (Canary Islands) where it represents almost 7... more Groundwater is the main water resource in La Gomera (Canary Islands) where it represents almost 70% of the consumption. Since the elaboration of the preliminary works of the Insular Hydrological Plan in 1996 there has not been other estimation of the island's rainfall. For an accurate estimation of the future hydrogeological resources of the island it is necessary to know and assess carefully the recharge estimates. It is for this reason that the choice of the rainfall interpolation method is so important. In this study two different interpolation methods have been used to compare their results with the real data of the gauges and to obtain doing that the best precipitation estimate in the area. Results show the kriging with external drift to be the best interpolation method in the study area and that the use of the relationship between elevation and precipitation increase the accuracy of the model.
Groundwater is the main water resource in La Gomera (Canary Islands) where it represents almost 7... more Groundwater is the main water resource in La Gomera (Canary Islands) where it represents almost 70% of the consumption. Since the elaboration of the preliminary works of the Insular Hydrological Plan in 1996 there has not been other estimation of the island's rainfall. For an accurate estimation of the future hydrogeological resources of the island it is necessary to know and assess carefully the recharge estimates. It is for this reason that the choice of the rainfall interpolation method is so important. In this study two different interpolation methods have been used to compare their results with the real data of the gauges and to obtain doing that the best precipitation estimate in the area. Results show the kriging with external drift to be the best interpolation method in the study area and that the use of the relationship between elevation and precipitation increase the accuracy of the model.
Journal of Iberian Geology, 2013
Pliocene-Pleistocene lava flows, mainly of dacitic composition, are exposed in the Sierra de las ... more Pliocene-Pleistocene lava flows, mainly of dacitic composition, are exposed in the Sierra de las Cruces (SC) volcanic range within the Mexican Volcanic Belt (MVB). SC volcanic rocks are porphyritic, generally containing an assemblage of plagioclase + amphibole + orthopyroxene ± clinopyroxene ± quartz ± Fe-Ti oxides. Most of them exhibit diverse mineralogical and geochemical features that attest a magma mixing and mingling processes with concomitant fractional crystallization in which a small volume of hot andesite magma injects into dacitic magma. Both rock types are probably derived from partial melting of continental crust at different levels. The evidences of magma mixing and mingling include: (a) normal and sieved plagioclases in the same sample, rounded and embayed crystals, and armoured rims over the dissolved crystal surfaces; (b) subrounded, vesicular magmatic enclaves, ranging from a few millimeters to ~20 centimeters in size, with plagioclase + orthopyroxene + amphibole + quartz ± olivine ± Fe-Ti-oxides assemblage; (c) mineral chemistry evidence such as crystals with reaction rims or heterogeneous plagioclase compositions (inverse and oscillatory zoning or normally and inversely zoned crystals) in the same sample; and (d) elemental geochemical variations and trace-element ratio more akin to magma mixing and to some extent diffusion process. These andesitic enclaves could be considered as portions of the intermediate magma that did not mix completely (mingling) with the felsic host lavas, confirming the major role of magma mixing and mingling processes in the overall evolution of the MVB
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Papers by Alvaro Bryan Quispe Márquez