Repositorio Digital Sernageomin
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Gravimetría de la Hoja Constitución, región del Maule
Get PDFContiene Anexos: Anexo I.Tabla 1.Estaciones bases de gravedad ; Anexo II.Tabla 2.Densidad de muestras de rocas ; Escala: 1:250.000 ; Coordenadas: 35°00' - 36°00'S / 71°45' - 73°15'O44 p
Comment on "Crustal faults in the Chilean Andes: geological constraints and seismic potential" by Santibáñez et al. (2019), Andean Geology 46 (1): 32-65
Get PDFpp.175-18
Remociones en masa e inspección de actividad de laderas en ruta W-637, comuna de Puqueldón, Provincia de Chiloé, región de Los Lagos
No full textInforme Técnico INF-Los Lagos-04.2021 -- Unidad Ejecutora: Oficina Técnica Puerto Varas, Región de Los Lagos17 p
Diagenesis and thermal maturity of the Cogollo Group sedimentary rocks in the ANH-CR-Montecarlo-1X well, Cesar-Ranchería Basin, Colombia
No full textThe exploration well ANH-CR-Montecarlo-1X, in the southern part of the Cesar-Ranchería basin in Colombia, cuts sedimentary rocks assigned to the Cogollo Group (Barremian-Cenomanian). The present study integrates petrographic techniques (thin section microscopy and scanning electron microscopy), geochemistry (total organic carbon and pyrolysis rock-eval) and basic petrophysics to establish the thermal maturity and potential of these rocks as a conventional or unconventional hydrocarbon reservoir. The results of petrographic analysis revealed that the rocks correspond to quartz sandstones and greywackes and the carbonate rocks to mudstones and wackestones. These were affected by diagenetic processes such as compaction and mineral neoformations. The latter include minerals from the clays group that cover the grains of the rock framework, and other types of precipitates, such as silica, ferrous and nonferrous carbonate that cement them. Some of these minerals present partial or total dissolution, for which secondary porosity is recognized. Chloritization and illitization of the argillaceous matrix and feldspars alteration to ferrous and non-ferrous carbonate are also observed, which affects the porosity and permeability of the rock. Additionally, during diagenesis micrite is recrystallized to sparite and carbonate precipitation ocurred in the calcareous rocks. The study also shows that the rocks were more affected by compaction than precipitation of the different types of cement, thus reducing their porosity and permeability. Based on these parameters the siliciclastic rocks in study area have a low potential as conventional reservoir but a good potential as non-conventional reservoir (tight sandstones). The geochemical studies in the calcareous rocks exhibit low content of total organic carbon (between 0 and 4.5% with an average of 0.71%), with kerogens type III and IV. They have high levels of organic matter conversion, indicative that the rocks did generate hydrocarbons, but currently are depleted and in a mature state, compatible with a low potential of hydrocarbon generation.pp.472-49
Reporte de visita técnica: Estado de las remociones en masa del sendero Bosque Encantado en el Parque Nacional Queulat, comuna de Puerto Cisnes, región de Aysén del General Carlos Ibáñez del Campo
No full textRevisor: Carolina Jara y Alejandro Alfaro22 p
Remociones en masa y crecidas fluviales en la cuenca del río Las Minas de Punta Arenas, región de Magallanes y de la Antártica Chilena
Get PDFInforme Registrado IR-21-91 ; Contiene: Anexo I.Catastro de Remociones en Masa151 p
Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow
No full textThe tectonic opening of the Tasmanian Gateway and Drake Passage represented crucial geographic requirements for the Cenozoic development of the Antarctic Circumpolar Current (ACC). Particularly the tectonic complexity of Drake Passage has hampered the exact dating of the opening and deepening phases, and the consequential onset of throughflow of the ACC. One of the obstacles is putting key regional tectonic events, recorded in southern Patagonian sediments, in absolute time. For that purpose, we have collected Campanian-Eocene sediment samples from the Chilean sector of Southern Patagonia. Using U-Pb radiometric dating on zircons and dinoflagellate cyst iostratigraphy, we updated age constraints for the sedimentary formations, and the hiatuses in between. Thick sedimentary packages of shallowmarine and continental sediments were deposited in the foreland basin during the early Campanian, mid-Paleocene, the Paleocene-Eocene boundary interval and the middle Eocene, which represent phases of increased foreland subsidence. We interpret regional sedimentary hiatuses spanning the late Campanian, early-to mid-Paleocene, mid-Eocene and latest Eocene-early Oligocene to indicate times of reduced foreland subsidence, relative to sediment supply. We relate these changes to varying subduction rates and Andean orogeny. Dinoflagellate cyst assemblages suggest that the region was under the influence of the Antarctic-derived waters through the western boundary current of the Subpolar Gyre, developed in the southwest Atlantic Ocean and thus argues for limited throughflow through the Drake Passage until at least the latest Eocene. However, the proliferation of dinoflagellate endemism we record in the southwest Atlantic is coeval with that in the southwest Pacific, and on a species level, dinoflagellate cyst assemblages are the same in these two regions. This suggests that both regions were oceanographically connected throughout the early Paleogene, likely through a shallow opening of a restricted Drake Passage. This implies a continuous surface-water connection between the south Pacific and the South Atlantic throughout the late Cretaceous-early Paleogene.pp.185-21
Estadísticas de accidentabilidad industria extractiva minera - año 2020
No full textReporte al 31 de diciembre de 202035 p
Caracterización de remociones en masa del 31 de mayo de 2021, en la ribera sur del lago Calafquén, sobre la ruta CH-201, comuna de Panguipulli, región de Los Ríos
No full textRevisor: Carlos Johnson ; Código de identificación interno: INF-LOS RÍOS-09.2021.23 p
Reporte de visita técnica: Deslizamientos en el km 795 de la ruta 7, sector río Murta, comuna de río Ibáñez, región de Aysén del General Carlos Ibáñez del Campo
No full textRevisor: Carolina Jara y Alejandro Alfaro22 p