Relevant bibliographies by topics / Geology – Chile

Academic literature on the topic 'Geology – Chile'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Geology – Chile"

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Camus, Francisco. "The geology of hydrothermal gold deposits in Chile." Journal of Geochemical Exploration 36, no. 1-3 (February 1990): 197–232. http://dx.doi.org/10.1016/0375-6742(90)90056-g.

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Veloso, Eugenio Andres Espinosa, Ryo Anma, and Toshitsugu Yamazaki. "Tectonic rotations during the Chile Ridge collision and obduction of the Taitao ophiolite (southern Chile)." Island Arc 14, no. 4 (December 2005): 599–615. http://dx.doi.org/10.1111/j.1440-1738.2005.00487.x.

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Oviedo, Luis, Nicolas Fuster, Natasha Tschischow, Luis Ribba, Alvio Zuccone, Enrique Grez, and Angelo Aguilar. "General geology of La Coipa precious metal deposit, Atacama, Chile." Economic Geology 86, no. 6 (October 1, 1991): 1287–300. http://dx.doi.org/10.2113/gsecongeo.86.6.1287.

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Garza, R. A. P., S. R. Titley, and F. Pimentel B. "Geology of the Escondida Porphyry Copper Deposit, Antofagasta Region, Chile." Economic Geology 96, no. 2 (March 1, 2001): 307–24. http://dx.doi.org/10.2113/gsecongeo.96.2.307.

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BAKER, P. E., O. GONZALEZ-FERRAN, and D. C. REX. "Geology and geochemistry of the Ojos del Salado volcanic region, Chile." Journal of the Geological Society 144, no. 1 (January 1987): 85–96. http://dx.doi.org/10.1144/gsjgs.144.1.0085.

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Hidalgo, E., S. Helle, G. Alfaro, and U. Kelm. "Geology and characterisation of the Pecket coal deposit, Magellan Region, Chile." International Journal of Coal Geology 48, no. 3-4 (January 2002): 233–43. http://dx.doi.org/10.1016/s0166-5162(01)00058-1.

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Arriagada, César, and Fernando Martínez. "Effects of the 27 February Chile Earthquake." Journal of Structural Geology 32, no. 4 (April 2010): 393. http://dx.doi.org/10.1016/j.jsg.2010.04.009.

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Suarez, M., M. Herve, and A. Puig. "Cretaceous diapiric plutonism in the southern cordillera, Chile." Geological Magazine 124, no. 6 (November 1987): 569–75. http://dx.doi.org/10.1017/s0016756800017398.

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AbstractThe Castores and probably the Santa Rosa plutons of north-west Isla Navarino, southern Chile, have been emplaced by in situ diapirism into metasedimentary rocks of the Upper Jurassic (?)–Lower Cretaceous Yaghan Formation. For the former, this model is consistent with the concentric foliation paralleling the margin of the pluton and the foliation and stratification planes in the metamorphic aureole. Only the southern part of the Santa Rosa Pluton is preserved, and it has some structures similar to those of the Castores Pluton, which can also be interpreted as produced by an inflating diapir. The main intrusive rocks of these plutons are quartz-monzodiorites and quartz-diorites with synmagmatic foliation. They were preceded by minor bodies of hornblende gabbros, and followed by dykes and small bodies of non-foliated granodiorites. Non-foliated to weakly foliated granodiorites, forming the centre of the Castores Pluton, probably represent a younger intrusive pulse.Twelve K–Ar mineral dates from 10 specimens of plutonic rocks, interpreted as near crystallization ages, span the period 80–90 Ma. These dates do not show the sequence of intrusion of the different rock-types, which may suggest that all of them were intruded and cooled in a short period of time. The timing of emplacement of these plutons in relation to tectonism is difficult to determine; however, a post-tectonic emplacement for at least the Castores Pluton, is proposed.
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Sillitoe, R. H., J. Tolman, and G. Van Kerkvoort. "Geology of the Caspiche Porphyry Gold-Copper Deposit, Maricunga Belt, Northern Chile." Economic Geology 108, no. 4 (May 2, 2013): 585–604. http://dx.doi.org/10.2113/econgeo.108.4.585.

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Kelm, U., M. Pincheira, J. Oyarzún, and V. Sucha. "Combarbalá advanced argillic alteration zone, Chile: geology, geochemistry, mineralogy and mineralization potential." Applied Earth Science 110, no. 2 (August 2001): 91–102. http://dx.doi.org/10.1179/aes.2001.110.2.91.

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Dissertations / Theses on the topic "Geology – Chile"

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May, Geoffrey. "Oligocene to recent evolution of the Calama Basin, northern Chile." Thesis, University of Aberdeen, 1997. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=191900.

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The Calama and eastern Pampa del Tamarugal Basins are located between 22°S and 23°S within the forearc of northern Chile. They are filled by sediments deposited in alluvial braidplain, fluvial, playa sandflat, lacustrine and volcaniclastic environments under a semi-arid to hyper-arid climate. The nature of the alluvial braidplain depositional environment is unusual in that it combines elements of both alluvial fan and fluvial depositional systems, in contradiction to recently published models of alluvial fan sedimentation. Detailed sedimentary logging, magnetostratigraphy and dating of 14 volcanic interbeds by the 40Ar/39Ar laser fusion method has established a lithostratigraphic and chronostratigraphic framework for the 700 m thick basin-fill. Basin formation was investigated by regional subsidence during the Late Eocene or Early Oligocene, followed by widespread alluvial braidplain deposition during the Oligocene(?). A change to fluvial and playa sandflat deposition during the Early to Mid-Miocene is considered to be coincident with a decrease in active subsidence. Sedimentation ceased and thick (25 m) gypcrete deposits developed along the eastern margin of the basin during the Mid-Miocene as a response to an increasingly arid climate. Phases of minor lacustrine, fluvial and alluvial braidplain deposition during the Late Miocene-Early-Pliocene and the Late Pliocene(?) to Pleistocene were primarily controlled by small-scale fault movements and folding events, although climatic variations may have been important in some cases. A new lithostratigraphic division of the basin-fill is proposed here, which comprises 13 different formations. The previously defined El Loa Formation comprises a number of depositional units which are spatially and temporally discrete formations, and is therefore awarded group status.
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Gardeweg, Moyra C. "The geology, petrology and geochemistry of the Tumisa volcanic complex, north Chile." Thesis, Kingston University, 1991. http://eprints.kingston.ac.uk/20550/.

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Tumisa (5,658 m) is a Pleistocene composite volcano located in the western margin of the Upper Cenozoic volcanic chain of the CVZ in northern Chile. It consists of a ~ 25 km[sup]3 non-welded deposit of block-and-ash flow and small-volume ignimbrites, small flank domes and a double peak formed by two cones, the younger a composite of lava flows and domes. The lava flows, domes and blocks of the pyroclastic flows are coarse-grained, crystal-rich dacite (host lava) with dominant plagioclase (An[sub]30-50) and magnesio-hornblendes with different proportions of orthopyroxene (En[sub]62-68), biotite and quartz phenocryts. Accesory phases include Fe-Ti oxides and apatite. These mineral assemblage coexist in disequilibrium with Mg-olivine and Mg-orthopyroxene. In addition to disequilibrium textures and mineral assemblages, there are widespread fine-grained, dark mafic inclusions. The inclusions are interpreted as blobs of hot (> 1100°C) basic magma containing < 5% crystals (Mg-olivine, Mg-orthopyroxene, Cr-rich spinel), which quenched on intrusion into a cool (~ 770°C), wet dacitic magma in a shallow level chamber (4-14 km). Repetitive supplies of the basic magma from depth triggered eruptions in a slowly cooling magma chamber. Mingling and partial hybridization of compositionally distinct multiple end-members was the dominant evolutionary process, combined with limited fractional crystallization, mainly in the basic magma. Post-mixing crystallization produced strongly contrasting mineral compositions due to temperature and compositional gradients. Calcic plagioclase (An[sub]50-74) and low-SiO[sub]2/high-TiO[sub]2 hornblende crystallized as prismatic or acicular aggregates in the inclusions (hyalodoleritic textures), as thin reversely zoned rims on resorbed phenocrysts and as groundmass grains. Clinopyroxene formed as acicular crystals in the inclusions, groundmass grains in the dacites and as reaction coronas around quartz. Mechanical transfer of phenocrysts between the two magmas and partial hybridization shifted whole-rock compositions (58.9-66.2% SiO[sub]2 for the host lavas; 52.7-58.4% SiO[sub]2 for the inclusions). The compositions are typical of normal calc-alkaline volcanoes from the western margin in the Central Andes. Isotopic ratios ([sup]87 Sr/[sup]86 Sr: 0.7055-0.70683; [sup]143 Nd/ [sup]144 Nd: 0.51239 to 0.51255, [epsilon][sup]Nd: -2.1 to -4.8) are within the normal range for parental magmas in this region and reflect minimal interaction with crustal material.
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King, Adrian Roi. "Magmatism, structure and mineralization in the Maricunga belt, N. Chile." Thesis, Imperial College London, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287751.

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Berger, Ingeborg Agnete. "Salts and surface weathering features on alluvial fans in Northern Chile." Thesis, University College London (University of London), 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362619.

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Buddin, Timothy Stuart. "Cenozoic tectonic evolution of the continental forearc of Northern Chile 18deg.-25deg.S." Thesis, Keele University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314654.

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Weller, Derek James. "A large late-glacial eruption of the Hudson Volcano, Southern Chile." Thesis, University of Colorado at Boulder, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1590001.

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Lakes formed in the Aysén region of southern Chile after the retreat of mountain glaciers, beginning by at least ~17,900 cal yrs BP, contain numerous late-glacial and Holocene tephra layers derived from >70 eruptions of the volcanoes in the region, including Hudson, the southernmost in the Andean Southern Volcanic Zone (SVZ). Sediment cores from six of these lakes each contain an unusually thick late-glacial age tephra layer, which based on its distribution and bulk trace-element composition was derived from a large explosive eruption of the Hudson volcano between 17,300 and 17,440 cal yrs BP, and is termed Ho. In these cores, located ~100 km northeast of Hudson, the Ho tephra layers range between 35 to 88 cm in thickness. Comparison with three previously documented large explosive Holocene Hudson eruptions (H1, H2, H3 1991 AD) suggests that Ho was larger, with an estimated tephra volume of >20 km3, the largest post-glacial eruption documented for any volcano in the southern Andes. In total, Hudson has erupted ≥45 km3 of pyroclastic material in the last ~17,500 years, making it the most active volcano in the southern Andes in terms of the total volume of pyroclastic material erupted since the beginning of deglaciation in the region. Chemical stratification is not seen in the Ho deposits, but this eruption was bi-modal, with a much greater proportion of dark glassy basaltic-andesite dense fragments and pumice, which range between 55 to 59 wt % SiO2, and volumetrically less significant lighter colored dacite pumice with 66 wt % SiO2. In contrast, H1 was andesitic in composition, H2 was more felsic than H1, being composed essentially of dacite, and although H3 in 1991 AD was again bi-modal, it erupted a much smaller proportion of mafic compared to felsic material than Ho. Thus, the repetitive large explosive eruptions of Hudson volcano have evolved to progressively less mafic overall compositions from late-glacial to historic times, and their volumes have decreased. All analyzed phases of different Hudson eruptions, have similar Sr-isotopic composition (0.70444 ± 0.00007), indicating that crystal-liquid fractionation rather than crustal assimilation was the main process responsible for these chemical variations.

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Hartley, Adrian J. "Mesozoic to recent evolution of the Andean forearc of northern Chile (22-24 s)." Thesis, Aston University, 1987. http://publications.aston.ac.uk/14378/.

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The Andean forearc of northern Chile comprises four morphotectonic units, which include from east to west: 1) The Cordillera de la Costa: composed of Jurassic granites and andesites, thought to represent a volcanic arc, the Mejillones terrane, an accreted allochthonous terrane, and the Lower Cretaceous Coloso basin, which formed through forearc extension along the suture between the Mejillones terrane and the Jurassic arc. Palaeomagnetic studies of the above units have identified approximately 29+/-11 degrees of clockwise rotation. Rotation is due to extension (caused by subduction roll back and slab pull), at an angle to the direction of absolute motion of the South American Plate. 2) The Central Depression: a large arid basin containing isolated fault-bounded blocks of pre-Mesozoic metamorphosed igneous rocks, Triassic sediments and volcanics, and Jurassic carbonates, deposited in a. back-arc basin setting. The isolated blocks formed through extension along previous thrust faults, these originated through compression of the back-arc basin due to accretion of the Jurassic volcanic arc. 3) The Precordillera.: composed of Permian-Triassic rift-related sediments and volcanics, Jurassic continental sediments synchronous with back-arc basin sedimentation, and Cretaceous and Oligo-Miocene continental sediments deposited in foreland basins. Palaeomagnetism has identified clockwise rotation in rocks ranging in age from Jurassic-Miocene. Rotation in the Precordillera. affected larger structural blocks than in the Cordillera de la Costa. 4) The Salar Depression: a. series of arid continental basins developed on continental crust. These basins nay have originated in the Triassic, when rifting of the South American craton is thought to have taken place. In conclusion, palaeomagnetic and geological evidence is consistent with the view that the north Chilean forearc was largely under an extensional stress regime. However, the presence of extensive compressional structures in Palaeocene and older rocks in the forearc together with the currently active foreland thrust belt of Argentina. indicate that throughout the evolution of the Andean Orogen, a delicate balance between compressional and extensional tectonic regimes has existed.
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Kloberdanz, Christine Marie. "Geochemical analysis of the Monturaqui Impact Crater, Chile." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/835.

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Ray, Francesca Margaret. "Stratigraphical and structural evolution of Tertiary backarc basins in southern Chile (44 deg to 47 deg)." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321144.

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Almasi, Peter Ferenc. "Dating the paleobeaches of Pampa Mejillones, northern Chile, by cosmogenic chlorine-36." Thesis, The University of Arizona, 2001. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_etd_hy0182_sip1_w.pdf&type=application/pdf.

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Books on the topic "Geology – Chile"

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Lavenu, Alain. Fallas cuaternarias de Chile. Santiago, Chile: Servicio Nacional de Geología y Minería, 2005.

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az-Navaes, Juan Di, and Jose Frutos. Geologi a marina de Chile. Valparai so, Chile: Comite Oceanogra fico Nacional de Chile, 2010.

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Endlicher, Wilfried. Geoökologische Untersuchungen zur Landschaftsdegradation im Küstenbergland von Concepción (Chile). Stuttgart: F. Steiner Verlag Wiesbaden, 1988.

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d'A, Ernesto Pérez. Contribuciones científicas: Instituto de Investigaciones Geológicos (IIG: 1957-1981) y Subdirección de Geología, Servicio Nacional de Geología y Minería (SERNAGEOMIN: 1982-1995). Santiago, Chile: Servicio Nacional de Geología y Minería, 1996.

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Pinto, L., S. A. Sepúlveda, L. B. Giambiagi, S. M. Moreiras, M. Tunik, Gregory D. Hoke, and M. Farías. Geodynamic processes in the Andes of central Chile and Argentina. London: The Geological Society, 2015.

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García, Alfredo R. Paleomagnetic reconnaissance of the Region de los Lagos, southern Chile, and its tectonic implications. Santiago, Chile: Editada por el Servicio Nacional de Geologia y Mineria, 1988.

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The Ordovician basin in the Puna of NW Argentina and N Chile: Geodynamic evolution from back-arc to foreland basin. Stuttgart: Schweizerbart, 1990.

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Lowell, J. David. Using applied geology to discover large copper and gold mines in Arizona, Chile, and Peru. Berkeley, Calif: Regional Oral History Office, The Bancroft Library, University of California, 1999.

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Darwin, Charles. Darwin en Chile: 1832-1835 : viaje de un naturalista alrededor del mundo. Santiago de Chile: Editorial Universitaria, 1996.

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Alfredo, Cepeda, Rivera Martínez Edgardo 1933-, and Brougère Anne-Marie, eds. Viaje a la América meridional: Brasil, República de Uruguay, República Argentina, La Patagonia, República de Chile, República de Bolivia, República del Perú : realizado de 1826 a 1833. 2nd ed. La Paz, Bolivia: Plural Editores, 2002.

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Book chapters on the topic "Geology – Chile"

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Encinas, Alfonso, Patricio Zambrano, Pablo Bernabé, Kenneth Finger, Luis Buatois, Victor Valencia, Mark Fanning, and Francisco Hervé. "Tectonic Implications of Deep-Marine Miocene Strata in the Western Andean Cordillera of South–Central Chile (40°–42°S)." In Springer Geology, 499–501. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_95.

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Fernandez-Lopez, Sixto Rafael, and Guillermo Baltazar Chong-Diaz. "Latest Bajocian Bio-Events of Ammonite Immigration and Colonization in the Tarapaca Basin (Northern Chile): Palaeoenvironmental Implications for Sequence Stratigraphy." In Springer Geology, 29–32. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_6.

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Iroumé, Andrés, Luca Mao, Andrea Andreoli, and Héctor Ulloa. "Large Wood Mobility in Mountain Rivers, Chile." In Engineering Geology for Society and Territory - Volume 3, 143–45. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09054-2_28.

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Palacios, C. M. "Geology of the Buena Esperanza Copper-Silver Deposit, Northern Chile." In Stratabound Ore Deposits in the Andes, 313–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-88282-1_23.

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Glueer, Franziska, and Simon Loew. "Rock Bridge Failure Caused by the Aysèn 2007 Earthquake (Patagonia, Chile)." In Engineering Geology for Society and Territory - Volume 2, 775–80. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-09057-3_131.

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Verzani, Lorenzo Paolo, Giordano Russo, Piergiorgio Grasso, and Agustín Cabañas. "The Risk Analysis Applied to Deep Tunnels Design—El Teniente New Mine Level Access Tunnels, Chile." In Engineering Geology for Society and Territory - Volume 6, 1023–30. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09060-3_186.

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Arenson, Lukas U., Matthias Jakob, and Pablo Wainstein. "Effects of Dust Deposition on Glacier Ablation and Runoff at the Pascua-Lama Mining Project, Chile and Argentina." In Engineering Geology for Society and Territory - Volume 1, 27–32. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09300-0_6.

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Marini, Mattia, Giuseppe Mancari, Antonio Damiano, Marta Alzate, and Michel Stra. "The Geological Reference Model for the Feasibility Study of the Corredor Bioceanico Aconcagua Base Tunnel (Argentina-Chile Trans-Andean Railway)." In Engineering Geology for Society and Territory - Volume 6, 623–26. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09060-3_110.

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Hermanns, Reginald L., Sergio A. Sepúlveda, Galderic Lastras, David Amblas, Miquel Canals, María Azpiroz, Ignacio Bascuñán, et al. "Earthquake-Triggered Subaerial Landslides that Caused Large Scale Fjord Sediment Deformation: Combined Subaerial and Submarine Studies of the 2007 Aysén Fjord Event, Chile." In Engineering Geology for Society and Territory – Volume 4, 67–70. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08660-6_14.

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Ulloa, Héctor, Lorenzo Picco, Andrés Iroumé, Luca Mao, and Carolina Gallo. "Analysis of Channel Morphology and Large Wood Characteristics Through Remote Images in the Blanco River After the Eruption of the Chaitén Volcano (Southern Chile)." In Engineering Geology for Society and Territory - Volume 3, 365–69. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09054-2_77.

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Conference papers on the topic "Geology – Chile"

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Laranja, S., M. Heredia, and L. Benyosef. "Geomagnetic study of the South Atlantic Magnetic Anomaly (SAMA) considering the geology in southern Brazil, northern Argentina, Paraguay and Chile." In Simpósio Brasileiro de Geofísica. Brazilian Geophysical Society, 2018. http://dx.doi.org/10.22564/8simbgf2018.021.

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Bustinza, Juan A., Ricardo J. Rocca, José M. Ponce, and Rodolfo Reale. "Geotechnical Aspects of the Norandino Pipeline at Mal Paso." In ASME 2013 International Pipeline Geotechnical Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipg2013-1969.

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The Norandino pipeline, build between 1998 and 1999, begins at the town of Pichanal nearby Orán in Argentina where it is connected to Argentinean Gas Transport System, It runs towards west crossing the Yunga in Salta province, climbs the Sierras Subandinas and the Cordillera Oriental through highly erosive environment, descends to Humahuaca city in Jujuy Province, crosses the Altiplano plateau, and reaches Chile through Paso de Jama then climbs up to 4.980 mas, crosses the Atacama desert to finally arrives at Tocopilla, Mejillones and Coloso cities. With 1070 km long and 20″ diameter, it’s capable to carry 4,6 million cubic meters per day expandable up to 8. The most hazardous part of the alignment is the Sierras Subandinas area, due mainly to geology and heavy rains. The east slope of the Cordillera Oriental, where the risk arises from the intense geodynamic and strong erosions in river crossings and landslides because of heavy rains that reach 1.500mm in four month, from December to March. In Cuesta de Mal Paso site, in front of San Andrés village in Salta Province, the pipeline should be laid along the hillside on a slope formed by the anticline limb, whose exposure to heavy erosion of the San Andres river at the base of the slope, the bedding to the river and seismic conditions of the region, constitute a geological and geotechnical risk to the pipeline integrity. The evaluation of deformation measurements of the slope, measured along several years, provided the necessary arguments to undertake the construction of tunnel in rock of 750 meters long and 2.5 meters wide and high, allowing the pipeline to pass below the main slip surface and therefore protecting it from a possible slide of the superficial layers of the slope. This paper describes the geological conditions, the geostructural situation of Cuesta de Mal Paso, the deformation monitoring system, the evaluation of the auscultation measurements, the design of the tunnel, the meaningful geological and geotechnical aspects of the tunnel construction and, finally, criteria for definition the auscultation system to monitoring the behavior of the tunnel and the Cuesta de Mal Paso slope.
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Rathbun, Kathryn, Ingrid Ukstins, and Stephen Drop. "A NEW GEOLOGIC INTERPRETATION OF MONTURAQUI METEORITE IMPACT CRATER, CHILE." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-307953.

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McDowell, Ronald R., Paula J. Hunt, Mary Sue Burns, Philip A. Dinterman, and J. Eric Lewis. "THE HUNTERSVILLE CHERT – WEST VIRGINIA’S GEOLOGIC “PROBLEM CHILD”." In Joint 69th Annual Southeastern / 55th Annual Northeastern GSA Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020se-345032.

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Klug, Jacob, Adán Ramirez, Emily E. Mixon, Brad Singer, Brian R. Jicha, and Paola Martinez. "INTERCALIBRATION OF THE SERVICIO NACIONAL DE GEOLOGÍA Y MINERÍA (SERNAGEOMIN), CHILE AND WISCAR 40AR/39AR LABORATORIES FOR QUATERNARY DATING." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-357787.

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Burney, Dave. "GEOLOGIC ASSESSMENT OF ACID CONSUMPTION FROM LEACHING OF OXIDE COPPER ORES OF THE EXOTIC EL TESORO COPPER DEPOSIT, NORTHERN CHILE." In 2004 New Mexico Geological Society Annual Spring Meeting. Socorro, NM: New Mexico Geological Society, 2004. http://dx.doi.org/10.56577/sm-2004.670.

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Hudyma, N., N. Walker, and B. Chittoori. "Mapping and Characterization of Rockfall Runout Talus Deposits from Columnar Basalt Cliffs in Boise, ID." In 56th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/arma-2022-2071.

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ABSTRACT: The Boise Valley contains several columnar jointed basalt cliffs, which were deposited approximately 1.4 to 0.5 Ma on terraces formed by downcutting of the Boise River. Three runout talus deposits on Whitney Terrace were characterized using unmanned aerial vehicle visual imagery. Although the runout talus deposits were from different areas and were of varying size, they contained roughly the same dimensions and distributions of blocks. Images of the cliff face indicated that blocks were detached from the base of columns along horizontal discontinuities which lacked support (undercut columns) and by toppling of basalt columns. The mapped block sizes in the cliff face were larger than the blocks in the associated runout, indicating the cliff blocks were fragmented during impacts in the runout. 1. INTRODUCTION The movement of geologic materials downslope, commonly referred to as landslides, is one of the most well-known geologic hazards. Varnes (1978) developed the most widely used classification framework for landslides. Since the Varnes classification scheme was developed, various modifications have been proposed and adopted. Still, the goal is to be able to describe the movement(s) and the end result(s) of the landslide using well-known terminology which incorporates the focus of the investigators (Hungr et al., 2014). Our focus is to characterize the runout talus deposits formed from the dislodgement and subsequent downslope movement of rock blocks from columnar basalt cliffs. Columnar basalt, or specifically columnar jointing in basalt, is a type of rock mass that is divided into long prismatic blocks. The formation of the jointing is complex and thought to be a series of events rather than simple cooling of the lava. The vertical discontinuities are continuous and horizontal discontinuities are less prominent and generally end at the edges of the vertical discontinuities (Spry, 1962). Failures of rock masses with columnar jointing have been studied in several geographical locations, including Australia (Dahlhaus and Miner, 2000), Chile (Holm and Jakob, 2009), Spain (Abellán et al., 2011), and Washington State (Guzek, 2019). The failure mechanism most often reported in these studies has been the somewhat generic term "rockfall", even though the studies mentioned above have shown that two failure (detachment) modes occur, rockfalls and rock topples.
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Mohamed, Farid Reza, Dolapo Otulana, Ivan Alberto Salazar, Han Xue, Li Fan, Dan Shan, Jim Bennett, et al. "Innovative Modeling to Quantify the Impact of Natural Fractures, Optimize Well Spacing and Increase Productivity in the Marcellus Shale." In SPE Eastern Regional Meeting. SPE, 2022. http://dx.doi.org/10.2118/211868-ms.

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Abstract Individual well performance in the Marcellus Shale of northeastern Pennsylvania varies markedly, even in areas where the lithology, fluid composition, and completion design are consistent. A primary reason for this is the natural fracture system, which influences hydraulic fracture growth, dynamic fluid flow, reservoir pressure and stress behavior. Chief Oil and Gas (Chief) contracted Schlumberger to conduct an integrated study using an innovative modeling approach to quantify the impact of these natural fractures and optimize field development. Working together, the team created an approach that consisted of constructing and coupling three models: a 3D geomechanical model, an unconventional fracture model (UFM), and a 3D dynamic dual-porosity model. The geomechanical model is composed of a discrete fracture network (DFN) containing both regional (J1 and J2 sets) and tectonic fractures. These are interpreted from seismic attributes (anisotropy azimuth, seismic velocity anisotropy) and ant tracking. The UFM model simulates the growth of hydraulic fractures and their interaction with natural fractures in the DFN. Portions of the natural fracture network are assumed to be open tectonic fractures, and their flow properties are adjusted (porosity and permeability) to match well performance. Adjustments are also made to account for production-related perturbations in dynamic stress magnitude and azimuth, which impact later wells. These modifications to the fracture network are critical for history matching the dual-porosity model. The production history match showed that hydraulic fractures and open tectonic natural fractures are key production drivers in the study area, and that the spatial variability of the natural fracture network exerts more influence on well performance than initially thought. The connection between the hydraulic fracture network and portions of the open tectonic natural fracture system enhances parent well access to larger drainage areas. This controls the strongly variable well production observed in the study area. Subsequent stress perturbation resulting from parent well depletion is detrimental to the completion efficiency of the child wells, even even though they have better frac designs with higher proppant loading. The modeling work also shows that the gas-in-place is consistent with volumetric and rate transient analysis (RTA) estimates. The coupling of the three models reasonably approximated changing reservoir conditions and created a nexus of domain expertise including geology, geophysics, geomechanics, stimulation, completions engineering and reservoir engineering. This enabled an understanding of the complex reservoir behavior of the naturally-fractured Marcellus Shale and generation of an optimized fit-for-purpose development plan. Chief was already implementing changes in spacing and increasing the distance between offset PDP (Proved Developed Producing) wells and this study affirmed that revised development plan.
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Reports on the topic "Geology – Chile"

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Tweet, Justin, Holley Flora, Summer Weeks, Eathan McIntyre, and Vincent Santucci. Grand Canyon-Parashant National Monument: Paleontological resource inventory (public version). National Park Service, December 2021. http://dx.doi.org/10.36967/nrr-2289972.

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Grand Canyon-Parashant National Monument (PARA) in northwestern Arizona has significant paleontological resources, which are recognized in the establishing presidential proclamation. Because of the challenges of working in this remote area, there has been little documentation of these resources over the years. PARA also has an unusual management situation which complicates resource management. The majority of PARA is administered by the Bureau of Land Management (BLM; this land is described here as PARA-BLM), while about 20% of the monument is administered by the National Park Service (NPS; this land is described here as PARA-NPS) in conjunction with Lake Mead National Recreation Area (LAKE). Parcels of state and private land are scattered throughout the monument. Reports of fossils within what is now PARA go back to at least 1914. Geologic and paleontologic reports have been sporadic over the past century. Much of what was known of the paleontology before the 2020 field inventory was documented by geologists focused on nearby Grand Canyon National Park (GRCA) and LAKE, or by students working on graduate projects; in either case, paleontology was a secondary topic of interest. The historical record of fossil discoveries in PARA is dominated by Edwin McKee, who reported fossils from localities in PARA-NPS and PARA-BLM as part of larger regional projects published from the 1930s to the 1980s. The U.S. Geological Survey (USGS) has mapped the geology of PARA in a series of publications since the early 1980s. Unpublished reports by researchers from regional institutions have documented paleontological resources in Quaternary caves and rock shelters. From September to December 2020, a field inventory was conducted to better understand the scope and distribution of paleontological resources at PARA. Thirty-eight localities distributed across the monument and throughout its numerous geologic units were documented extensively, including more than 420 GPS points and 1,300 photos, and a small number of fossil specimens were collected and catalogued under 38 numbers. In addition, interviews were conducted with staff to document the status of paleontology at PARA, and potential directions for future management, research, protection, and interpretation. In geologic terms, PARA is located on the boundary of the Colorado Plateau and the Basin and Range provinces. Before the uplift of the Colorado Plateau near the end of the Cretaceous 66 million years ago, this area was much lower in elevation and subject to flooding by shallow continental seas. This led to prolonged episodes of marine deposition as well as complex stratigraphic intervals of alternating terrestrial and marine strata. Most of the rock formations that are exposed in the monument belong to the Paleozoic part of the Grand Canyon section, deposited between approximately 510 and 270 million years ago in mostly shallow marine settings. These rocks have abundant fossils of marine invertebrates such as sponges, corals, bryozoans, brachiopods, bivalves, gastropods, crinoids, and echinoids. The Cambrian–Devonian portion of the Grand Canyon Paleozoic section is represented in only a few areas of PARA. The bulk of the Paleozoic rocks at PARA are Mississippian to Permian in age, approximately 360 to 270 million years old, and belong to the Redwall Limestone through the Kaibab Formation. While the Grand Canyon section has only small remnants of younger Mesozoic rocks, several Mesozoic formations are exposed within PARA, mostly ranging in age from the Early Triassic to the Early Jurassic (approximately 252 to 175 million years ago), as well as some middle Cretaceous rocks deposited approximately 100 million years ago. Mesozoic fossils in PARA include marine fossils in the Moenkopi Formation and petrified wood and invertebrate trace fossils in the Chinle Formation and undivided Moenave and Kayenta Formations.
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Geologic map of the Chili Quadrangle, Rio Arriba County, New Mexico. US Geological Survey, 1985. http://dx.doi.org/10.3133/mf1814.

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