A5069720552- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- Mineralogy and Gemology Studies
- Metallurgical Processes and Thermodynamics
- Archaeology and ancient environmental studies
- Isotope Analysis in Ecology
- Heavy metals in environment
- Geological and Geophysical Studies
- Geomagnetism and Paleomagnetism Studies
- Geological and Tectonic Studies in Latin America
- Geological Studies and Exploration
- Geochemistry and Elemental Analysis
- Pleistocene-Era Hominins and Archaeology
University of Concepción
2005-2022
The collision of a divergent ocean ridge may evolve into two end cases: in the continuity ocean-floor subduction, or detachment subducted plate. northern Patagonia active plate margin has unique situation that Cenozoic time it been subjected to collisions, each one representing members. Neogene Antarctica-Nazca evolved as continuous subduction system, promoting magmatic hiatus at arc axis, obduction part fore-arc, and basaltic volcanism back-arc. In contrast, Paleogene Farallon-Aluk...
Abstract The Andean cordillera was constructed during compressive tectonic events, whose causes and controls remain unclear. Exploring a possible link to plate convergence has been impeded by the coarse temporal resolution of existing kinematic models. Here we show that Neogene evolution margin is primarily related changes in as observed new high-resolution reconstructions. Building on compilation finite rotations spanning last 30 million years using noise-mitigation techniques, predict...
Zircon LA-ICP-MS and CA-TIMS molybdenite Re-Os geochronology for the El Abra porphyry copper deposit (Chile) document a ~8.6 Ma protracted magmatic-hydrothermal history. Initial magmatic events occurred at ~45 Ma, continued to ~36 Ma. An ~1.8 m.y. lull is recorded in early stages of magmatism, which characterized by equigranular rocks from Pajonal suite. Magmatism ~41 corresponding Granodiorite Complex, more recurrent, ending ~1.4 period porphyritic intrusions, are coeval with Cu-Mo...
Abstract Primitive olivines from the monogenetic cones Los Hornitos, Central-South Andes, preserve dendritic, skeletal, and polyhedral growth textures. Consecutive stages of textural maturation occur along compositional gradients where high Fo–Ni cores (Fo 92.5 , Ni ~3500 ppm) contrast with composition dendritic < 91.5, 3000 ppm), indicating sequential nucleation. Here we present a new model for oscillatory olivine zoning that contrasts standard interpretation continuous, core-to-rim...
RESUMEN Las serpentinitas del area de La Cabana forman parte la Serie Occidental Basamento Metamorfico Cordillera Costa IX Region y corresponden a dunitas grano grueso parcial totalmente serpentinizadas. Contienen cromita como mineral accesorio, que generalmente esta alterada en grado variable ferricromita. En cambio, las cromitas presentes cromititas Centinela Bajo, preservan su composicion original con un minimo alteracion, lo permite uso indicadores petrotectonicos. Sus valores 'numero...
Las serpentinitas del area de La Cabana forman parte la Serie Occidental Basamento Metamorfico Cordillera Costa IX Region y corresponden a dunitas grano grueso parcial totalmente serpentinizadas. Contienen cromita como mineral accesorio, que generalmente esta alterada en grado variable ferricromita. En cambio, las cromitas presentes cromititas Centinela Bajo, preservan su composicion original con un minimo alteracion, lo permite uso indicadores petrotectonicos. Sus valores 'numero cromo'...