Early Andean Magmatism in Southern Central Chile (33°–40° S)

2020 ◽  
pp. 107-126
Author(s):  
Pablo Rossel ◽  
Francisco Carvajal
Keyword(s):  
Central Chile ◽  
Southern Central

scholarly journals The late Paleozoic paired metamorphic belt of southern Central Chile: Consequence of a near-trench thermal anomaly?

2021 ◽  
Author(s):  
Guido Gianni
Keyword(s):  
Thermal Anomaly ◽  
Accretionary Prism ◽  
Late Paleozoic ◽  
Metamorphic Belt ◽  
Central Chile ◽  
Geodynamic Process ◽  
Mid Ocean Ridge ◽  
Southern Central ◽  
Geological Units ◽  
Ocean Ridge

The hypothesis of a subduction-related Miyashiro-type paired metamorphic belt for the origin of the late Paleozoic igneous and metamorphic complex in the Andean Coastal Cordillera has remained unquestioned since its proposal in the early seventies. A synthesis of the advances in the study of these metamorphic rocks between 33°S and 42°S, revising field relations among geological units, and geochemical and geochronological data from the contemporaneous granitoids of the Coastal Batholith, highlights inconsistencies in this model. The record of short-lived forearc magmatism in the late Paleozoic intruding the partially synchronous accretionary prism, and geochemical and isotopic data from the igneous rocks indicating sources from the accretionary prism sediments and the back-top lithosphere, suggest a departure from typical subduction settings. I conclude that the anomalous configuration of the paired metamorphic belt and the associated Coastal Batholith resulted from a complex geodynamic process involving a near-trench thermal anomaly caused by the subduction of a trench parallel mid-ocean ridge.

scholarly journals Hiking trails as conduits for the spread of non-native species in mountain areas

2019 ◽  
Vol 22 (3) ◽  
pp. 1121-1134 ◽  
Author(s):  
Rebecca Liedtke ◽  
Agustina Barros ◽  
Franz Essl ◽  
Jonas J. Lembrechts ◽  
Ronja E. M. Wedegärtner ◽  
...  
Keyword(s):  
Native Species ◽  
Control Plant ◽  
Plant Invasions ◽  
Native Plant ◽  
Mountain Areas ◽  
Central Chile ◽  
Hiking Trails ◽  
Local Plant ◽  
Southern Central ◽  
Recreational Use

AbstractRoadsides are major pathways of plant invasions in mountain regions. However, the increasing importance of tourism may also turn hiking trails into conduits of non-native plant spread to remote mountain landscapes. Here, we evaluated the importance of such trails for plant invasion in five protected mountain areas of southern central Chile. We therefore sampled native and non-native species along 17 trails and in the adjacent undisturbed vegetation. We analyzed whether the number and cover of non-native species in local plant assemblages is related to distance to trail and a number of additional variables that characterize the abiotic and biotic environment as well as the usage of the trail. We found that non-native species at higher elevations are a subset of the lowland source pool and that their number and cover decreases with increasing elevation and with distance to trails, although this latter variable only explained 4–8% of the variation in the data. In addition, non-native richness and cover were positively correlated with signs of livestock presence but negatively with the presence of intact forest vegetation. These results suggest that, at least in the region studied, hiking trails have indeed fostered non-native species spread to higher elevations, although less efficiently than roadsides. As a corollary, appropriate planning and management of trails could become increasingly important to control plant invasions into mountains in a world which is warming and where visitation and recreational use of mountainous areas is expected to increase.

scholarly journals The Chile Biliary Longitudinal Study: A Gallstone Cohort

2020 ◽  
Author(s):  
Jill Koshiol ◽  
Vanessa Van De Wyngard ◽  
Emma E McGee ◽  
Paz Cook ◽  
Ruth M Pfeiffer ◽  
...  
Keyword(s):  
Longitudinal Study ◽  
Blood Cells ◽  
Blood Clot ◽  
Buffy Coat ◽  
Central Chile ◽  
Southern Central ◽  
Risk Areas ◽  
Detection Strategies ◽  
Primary Risk Factor

Abstract Gallbladder cancer (GBC) is a highly fatal cancer that can be cured through cholecystectomy if identified early. The presence of gallstones is the primary risk factor for GBC, but few people with gallstones develop GBC. A key question is what drives the development of GBC among persons with gallstones. We initiated the Chile Biliary Longitudinal Study (Chile BiLS) to address this question. From 2016 to 2019, Chile BiLS enrolled 4,726 women aged 50–74 years with ultrasound-detected gallstones from southern-central Chile, accounting for an estimated 36% of eligible women with gallstones in the study area. The median age was 59 years; 25% of the women were Amerindian (Mapuche), 60% were obese, 25% had diabetes, and 6% had cardiovascular disease. Participants will be followed for gallbladder dysplasia or cancer for 6 years. As of April 30, 2020, over 91% of those eligible completed the year 2 follow-up visit. Data being collected include epidemiologic and sociodemographic information, anthropometric measurements, blood pressure, and tooth counts. Biosamples being taken include baseline plasma, buffy coat, red blood cells, serum, blood clot from serum, and PAXgene whole blood (PreAnalytiX GmbH, Hombrechtikon, Switzerland). Complete gallbladder sampling is conducted for most participants undergoing cholecystectomy. The Chile BiLS cohort study will increase our understanding of GBC etiology and could identify potential risk stratification and early detection strategies in high-risk areas.

Impact of spring upwelling variability off southern-central Chile on common sardine (Strangomera bentincki) recruitment

2012 ◽  
Vol 21 (6) ◽  
pp. 405-414 ◽  
Author(s):  
FABIAN GOMEZ ◽  
ALDO MONTECINOS ◽  
SAMUEL HORMAZABAL ◽  
LUIS A. CUBILLOS ◽  
MARCO CORREA-RAMIREZ ◽  
...  
Keyword(s):  
Central Chile ◽  
Southern Central

scholarly journals Effect of trench-outer rise bending-related faulting on seismic Poisson's ratio and mantle anisotropy: a case study offshore of Southern Central Chile

2008 ◽  
Vol 173 (1) ◽  
pp. 142-156 ◽  
Author(s):  
Eduardo Contreras-Reyes ◽  
Ingo Grevemeyer ◽  
Ernst R. Flueh ◽  
Martin Scherwath ◽  
Joerg Bialas
Keyword(s):  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Central Chile ◽  
Outer Rise ◽  
Southern Central ◽  
Mantle Anisotropy

Activity patterns in sympatric carnivores in the Nahuelbuta Mountain Range, southern-central Chile

Mammalia ◽  
2017 ◽  
Vol 81 (5) ◽  
Author(s):  
Alfredo H. Zúñiga ◽  
Jaime E. Jiménez ◽  
Pablo Ramírez de Arellano
Keyword(s):  
Species Interactions ◽  
Activity Patterns ◽  
Point Of View ◽  
Camera Traps ◽  
Sampling Effort ◽  
Mountain Range ◽  
Central Chile ◽  
Biological Communities ◽  
Southern Central ◽  
Sympatric Carnivores

AbstractSpecies interactions determine the structure of biological communities. In particular, interference behavior is critical as dominant species can displace subordinate species depending on local ecological conditions. In carnivores, the outcome of interference may have important consequences from the point of view of conservation, especially when vulnerable species are the ones suffering displacement. Using 24 baited camera traps and a sampling effort of 2821 trap nights, we examined the activity patterns and spatial overlap of an assemblage of five sympatric carnivores in the Nahuelbuta Mountain Range, in southern-central Chile. In this forested landscape we found predominantly nocturnal activity in all species, but not for the puma (

scholarly journals Alteration of the subducting oceanic lithosphere at the southern central Chile trench-outer rise

2007 ◽  
Vol 8 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Eduardo Contreras-Reyes ◽  
Ingo Grevemeyer ◽  
Ernst R. Flueh ◽  
Martin Scherwath ◽  
Martin Heesemann
Keyword(s):  
Oceanic Lithosphere ◽  
Central Chile ◽  
Outer Rise ◽  
Southern Central
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