Repositorio Digital Sernageomin
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Gravimetría de la Hoja Ovalle, región de Coquimbo
No full textContiene Anexos: I.Correcciones a las Mediciones Gravimétricas ; II.Estaciones de Enlaces Gravimétricos ; III.Densidades de rocas ; Escala 1:250.000 ; Coordenadas: 30° - 31°S / 70°45' - 72°O35 p
Minuta técnica : Remoción en masa camino costero Pelluhuín, comuna de Puerto Montt
No full textMinuta técnica9 p
Conodont biostratigraphy and correlation of the San Juan Formation at the Cerro La Silla section, middle Tremadocian-lower Dapingian, Central Precordillera, Argentina
No full textThis study deals with the conodont biostratigraphy from the uppermost part of La Silla Formation (9.6 m) and the overlying San Juan Formation (264.7 m), at the Cerro La Silla section, Central Precordillera of San Juan, Argentina. The 41 samples of carbonate rocks that were digested for microfossils yielded 11,388 conodont elements corresponding to 78 species. The Paltodus deltifer deltifer Subzone of the Paltodus deltifer Zone from the Baltic biostratigraphic scheme is represented at the top stratum of the La Silla Formation and the basal part of the San Juan Formation (28.4 m), which correlates with the Macerodus dianae Zone (middle Tremadocian) of the Precordilleran and North American schemes. Following upwards, the Paroistodus proteus, Prioniodus elegans, Oepikodus evae, Oepikodus intermedius and Baltoniodus triangularis-Tripodus laevis zones (middle Tremadocian-lower Dapingian) are recorded in the San Juan Formation. The Baltoniodus triangularis-Tripodus laevis Zone is recognized from the second reef level (177.3 m from the base of the San Juan Formation) up to the top stratum in the section, in contrast to previous interpretations that assigned the referred interval to the Baltoniodus navis, Paroistodus originalis and Microzarkodina parva zones of the Baltic biostratigraphic scheme. The division of the Oepikodus evae Zone in subzones, according to its original definition for the Precordillera, is not applicable at the Cerro La Silla section due to the particular species distribution. The conodont elements show a brown alteration color (CAI 2-2.5), which indicates a burial paleotemperature of 60-155°C for the bearer stratapp.577-59
Sobrevuelo tras evento de remoción en masa el día 01 de abril de 2020, Ruta X-50, camino Puerto Aysén - Mañihuales, región de Aysén, Chile.
No full textRevisor: Carolina Jara12 p
Peligros del Complejo Volcánico Puyehue-Cordón Caulle, regiones de Los Ríos y Los Lagos
No full textContiene Anexos: Anexo I.Catastro de Erupciones ; Anexo II.Dataciones Radiométricas ; III.Glosario ; Escala: 1:75.000 ; Coordenadas: 40°35'S / 72°07'O63 p
Aportes a la metalogénesis del basamento proterozoico superior-cámbrico de las Sierras Pampeanas Orientales: mineralogía, termometría e isótopos de azufre del skarn Malagueño (Cu-Fe±Zn), Sierra Chica, Córdoba, Argentina
Get PDFpp.14-4
Bases de datos de depósitos metalíferos entre la Cordillera de la Costa y el flanco occidental de la Cordillera de Domeyko, 25-26° S, Chile
Get PDFContiene 4 bases de datos (tablas Excel y archivo digital SIG) : Depósitos metalíferos ; Análisis químicos ; Dataciones radiométricas ; Zonas de alteración hidrotermal ; Zonas de alteración hidrotermal (archivo digital SIG
Trace metal partitioning and potential mobility in the naturally acidic sediment of Lake Caviahue, Neuquén, Argentina
No full textLake Caviahue, in Patagonia (Argentina), is a very acid water body (Patagonia, Argentina) due to the influx of volcanic fluids. Over the past 18 years, the lake has been progressively alkalinizing and pH is close to the ferric iron precipitation threshold (pH>3,0). Should iron precipitate, water and sediment composition will be altered. To set a baseline, trace metal partitioning (Cu, Cd, Cr, Pb, Zn and Mn) was studied for three sediment cores (0 to 16 cm depth) at three sampling stations using a sequential extraction procedure (SEP) and the acid volatile sulfide/simultaneously extracted metals (AVS/SEM) protocol. The total metals content of the sediments ranged between 0 to 408 µg g-1 of dry sediment, with Pb>Cr>Mn>Cu>Zn>Cd. No Cd was measured above the limit of detection. The sediment was richest in Mn and Cr, two non-toxic metals at the pH / Eh combination of the lake basin. Total Pb was at a moderate contamination level although it is associated with the most recalcitrant fraction and therefore has low mobility. The sediment fractions with higher metal content were the oxidizable and residual, the former commonly associated with labile organic matter and pyrite while the latter are related to recalcitrant organic matter and rock forming minerals. In addition, a high correlation was found between Cr, Pb and Mn, thus these metals may be subject to analogous precipitation processes and possibly to co-variation in the volcano effluents. Furthermore, no metals were detected in the exchangeable/carbonates fraction, which is the most labile of all the sediment fractions. The metal content in (SEM) was likewise below the toxicity thresholds of two international sediment quality guidelines and the ratio AVS/SEM was over one, indicative of non-toxicity. Both results indicate that metal mobility in the acidic sediments of lake Caviahue is very lowpp.46-6
Deslizamiento y anegamiento por desborde de aguas lluvias en población Anahuac, cuesta México, calle Acapulco, Puerto Montt, Región de Los Lagos
No full textInforme Técnico -- Unidad Ejecutora: Oficina Técnica Puerto Varas, Los Lagos16 p