El Escondido tuff cone (38 ka): a hidden history of monogenetic eruptions in the northernmost volcanic chain in the Colombian Andes

2019 ◽  
Vol 81 (12) ◽  
Author(s):  
L. Sánchez-Torres ◽  
A. Toro ◽  
H. Murcia ◽  
C. Borrero ◽  
R. Delgado ◽  
...  
2021 ◽  
Vol 412 ◽  
pp. 107194
Author(s):  
Natalia Salazar-Muñoz ◽  
Carlos Arturo Ríos de la Ossa ◽  
Hugo Murcia ◽  
Dayana Schonwalder-Ángel ◽  
Luis Alvaro Botero-Gómez ◽  
...  

Author(s):  
Henry Hooghiemstra ◽  
Antoine Cleef ◽  
Suzette Flantua

We praise the authors for their work, and for the lyric title of their paper. We give a concise sketch of the present level of understanding of Quercus forest in Colombia. We identify the shortcomings in this published paper. We improve the relevance of this paper about Quercus as well as for future phylogenetic investigations other montane forest taxa to be framed in the rapidly improving palaeoecological understanding of the Northern Andes.


2021 ◽  
Vol 15 (2) ◽  
pp. 377-392
Author(s):  
James L. Luteyn ◽  
Daniel Mauricio Díaz-Rueda

Gonocalyx pulcher (Ericaceae: Vaccinieae) has been rediscovered in the northeastern Colombian Andes after a lapse of over 135 years. Recent collections herein reported represent the only collections made since the type gathering by Schlim in 1851. The history of collections, cultivation, taxonomy, and nomenclature is re-viewed. Generic and species descriptions for G. pulcher are updated and photographic illustrations are provided. The vegetation in which G. pulcher occurs, a list of its commonly associated Ericaceae, and its conservation status are briefly described. A new second-step lectotypification is made and the associated type herbarium specimens are illustrated. A key to all 11 species of Gonocalyx is provided.


1996 ◽  
Vol 39 (2) ◽  
Author(s):  
M. Arcila

Located in the extreme northwestern part of the Los Coconucos volcanic chain in the Central Cordillera, the Purace is one of Colombia's most active volcanoes. Recent geological studies indicate an eruptive history of mainly explosive behavior which was marked most recently by a minor ash eruption in 1977. Techniques used to forecast the renewal of activity of volcanoes after a long period of quiescence include the monitoring of seismicity and ground deformation near the volcano. As a first approach toward the monitoring of the Purace volcano, Southwest Seismological Observatory (OSSO), located in the city of Cali, set up one seismic station in 1986. Beginning in June 1991, the seismic signals have also been transmitted to the Colombian Geological Survey (INGEOMINAS) at the Volcanological and Seismological Observatory (OVS-UOP), located in the city of Popayan. Two more seismic stations were installed early in 1994 forming a minimum seismic network and a geodetic monitoring program for ground deformation studies was established and conducted by INGEOMINAS.


2015 ◽  
Vol 3 (4) ◽  
pp. SAA17-SAA27 ◽  
Author(s):  
Vanessa Parravano ◽  
Antonio Teixell ◽  
Andrés Mora

Geologic maps, seismic lines, and data from a dry exploration well were used to develop a new structural model for a segment of the eastern foothills of the Eastern Cordillera of Colombia, emphasizing the role of salt tectonics. Milestones in the deformation history of the Guatiquía foothills were studied by sequential section restoration to selected steps. Uncommon structural geometries and sparse salt occurrences were interpreted in terms of a kinematic evolution in which Cretaceous salt migration in extension produced a diapiric salt wall, which was subsequently welded during the main episodes of the Andean compression, when the salt wall was squeezed generating a large overturned flap. Salt-weld strain hardening resulted in breakthrough thrusting across the overturned flap in late deformation stages. We have evaluated a pattern of salt tectonics previously unrecognized in the foothills thrust belt, which may be significant in other parts of the external Colombian Andes.


2021 ◽  
Author(s):  
Sofía Zorrilla‐Azcué ◽  
Antonio González‐Rodríguez ◽  
Ken Oyama ◽  
Mailyn A. González ◽  
Hernando Rodríguez‐Correa

1987 ◽  
Vol 143 (4) ◽  
pp. 307-327 ◽  
Author(s):  
Jacques Bourgois ◽  
Jean-François Toussaint ◽  
Humberto Gonzalez ◽  
Jacques Azema ◽  
Bernardo Calle ◽  
...  

Geology ◽  
2021 ◽  
Author(s):  
Robert Pockalny ◽  
Ginger Barth ◽  
Barry Eakins ◽  
Katherine A. Kelley ◽  
Christina Wertman

The Line Islands volcanic chain in the central Pacific Ocean exhibits many characteristics of a hotspot-generated seamount chain; however, the lack of a predictable age progression has stymied previous models for the origin of this feature. We combined plate-tectonic reconstructions with seamount age dates and available geochemistry to develop a new model that involves multiple melt regions and multiple melt delivery styles to explain the spatial and temporal history of the Line Islands system. Our model identifies a new melt source region (Larson melt region at ~17°S, ~125°W) that contributed to the formation of the Line Islands, as well as the Mid-Pacific Mountains and possibly the Pukapuka Ridge.


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