... with early to middle Miocene strata farther to the north, including the El Diablo Formation ( Dingman and Galli, 1965 ). In places, alluvial fans of younger age spread into the basin from the Sierra Moreno. West of the survey area, the Rio Loa has incised the gravels to a depth of about 50 m. The Rio Loa...

... conditions of mineral formation: sulfates with only trivalent iron or with Fe 3+  > Fe 2+ strongly prevail there. calamaite new mineral titanium sulfate crystal structure oxidation zone Alcaparrosa mine El Loa province Chile The chemical composition of calamaite (average of 8 spot...

... Alcaparrosa, El Loa province, Antofagasta region, Chile, in two associations, one of which includes coquimbite, tamarugite, alum-(Na), rhomboclase, yavapaiite, voltaite and opal, and the other one is botryogen, opal, tamarugite, alum-(K), pickeringite, magnesiocopiapite, and jarosite. Magnesiovoltaite forms...

...A. R. Kampf; S. J. Mills; R. M. Housley; P. A. Williams; M. Dini Abstract Alcaparrosaite, ideally K 3 Ti 4+ Fe 3+ (SO 4 ) 4 O(H 2 O) 2 , is a new mineral from the Alcaparrosa mine, Cerritos Bayos, El Loa Province, Antofagasta, Chile (IMA2011-024). The mineral occurs on and intergrown...

... of first incision of the Loa Canyon system in the zone between the Calama and Quillagua basins to be younger than approximately 3 Ma. The 3000 km 2 Quillagua lacustrine depocenter lies in the northern Chile forearc between 21.0–21.8°S and 69.3-69.9°W, at 700 to 1000 meters above sea level (masl...

... , Fault zone hydrogeology : Earth-Science Reviews , v. 127 , p. 171 – 192 , doi:10.1016/j.earscirev.2013.09.008. Berenguer J. Cáceres I. Sanhueza C. Hernández P. , 2005 , El Qhapaqñan en el Alto Loa, norte de Chile: Un estudio micro y macromorfológico : Estudios Atacameños...

...Gustavo Loa; Alejandro Muñoz; Sandra Santa-Cruz Incremental seismic rehabilitation (ISR) consists of a set of discrete rehabilitation actions in order to decrease initial costs and to avoid long-lasting disruptions. Nevertheless, there are few cases of incrementally retrofitted buildings and few...

... ; Rech et al., 2010 ). The Opache Formation, the focus of this study, lies stratigraphically near the top of this succession within the El Loa Group, (locally over 2000 m thick), which infills basement topography ( Figs. 1 , 2A ). The El Loa Group’s siliciclastic strata are interpreted as having formed...

...) in the Cerros de Limon Verde in the Province of Antofagasta. The only permanent water course of any importance is the Rio Loa, which flows into the sea north of Tocopilla. Downstream from Calama the Loa water is extremely salty. The oldest rocks exposed in northern Chile are found in the southern...

... been recognized, excluding Pleistocene or Upper Pliocene beds ascribed to the El Loa formation. The El Loa formation is composed of limestone, sandstone, siltstone, and diatomite where mastodons and fresh-water mollusks were found ( Hoffstetter et al. , 1957 ). The beds which make up...

...-meter wide, steeply-dipping, bornite-rich veins, were reported to have been 23% to 32% Cu. Between 1900 and 1930, the copper-bearing vein mines at Collahuasi represented the third most important copper producer in Chile (after Chuquicamata and El Teniente). Available records indicate that approximately...

...Teresa E. Jordan; Naomi E. Kirk-Lawlor; Nicolás P. Blanco; Jason A. Rech; Nicolás J. Cosentino Abstract The landscape of the hyperarid Atacama Desert in northern Chile records extremely slow change on Earth’s surface. Disputed ages for the onset of hyperaridity range from the late Paleogene through...

.... 2001 , Geology and volcanology of La Palma and El Hierro, western Canaries : Estudios Geológicos , v. 57 , p . 175 – 273 . Ginibre C. Wörner G. 2007 , Variable parent magmas and recharge regimes of the Parinacota magma system (N. Chile) revealed by Fe, Mg and Sr zoning...

... porphyry Cu-Mo deposits of the Collahuasi district and other porphyry Cu-Mo deposits of the upper Eocene-lower Oligocene porphyry Cu-Mo belt of northern Chile. Late Eocene-early Oligocene porphyry Cu-Mo deposits are spatially associated with the Domeyko fault system. The Loa Fault is also shown (compiled...

... Huete C. Maksaev V. Moscoso R. Ulriksen C. Vergara H. Antecedentes geocrónologicos de rocas intrusivas y volcánicas en la cordillera de los Andes compredida entre la Sierra Moreno y el Rio Loa, y los 21° y 22° lat Sur, II Región, Chile, Rev geol Chile 1977 4 35 41 James...

... – 12288 doi: 10.1029/94JB00129. González , G. , Jensen , A. , and Schneider , H. , 1997 , Deformaciones recientes en la terminación norte de la zona de falla de Atacama; Salar Grande, norte de Chile: Antofagasta, Chile , Partición de la deformación por el efecto de bloqueamiento...

... Atacama Desert (lat 22°–24°S) of Chile ( Fig. 2 ). Tilomonte Springs (lat 23°47′S, long 68°05′W, ∼2500 m), a complex of springs and related streams and wetlands, is located in the southeast part of the Salar de Atacama basin near the base of the Andes. The Río Loa (lat 22°20′ S, long 68°40′W, ∼2500 m...

...) . Naranjo & Paskoff (1981) defined the El Loa and Chiu Chiu Formations; the former is now given Group status and comprises the Opache and Jalquinche Formations. They considered the domes and hollows located in the Calama Basin to be due to differential compaction of unconsolidated sediments...

... Collahuasi district are aligned broadly east-west between the N-striking West and El Loa regional faults, parts of the Domeyko fault system within the middle Eocene-early Oligocene belt ( Figs. 1 , 2B ; Table 1 ). At El Colorado, ~2 km southwest of the Quebrada Blanca deposit ( Fig. 2B ), porphyry Cu-type...

... is referred to as the Survey. Pasadena associatedwith a magnitude, means the estimate made at the SeismologicalLaboratoryin Pasadena.] Southern Magallanes Province, near Punta Arenas, Chile, December 17, 1949The J.S.A. reports a shock at 15~07m56s, G.C.T., with epicentral region 53?5 S, 72?5 W...