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Jorge Nieto-obregon - One of the best experts on this subject based on the ideXlab platform.
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Geologic setting of the Peña de Bernal Natural Monument, Querétaro, México: An endogenous volcanic dome
Geosphere, 2013Co-Authors: Gerardo J. Aguirre-diaz, Alfredo Aguillón-robles, Margarito Tristán-gonzález, Guillermo Labarthe-hernández, Margarita Lopez-martinez, Hervé Bellon, Jorge Nieto-obregonAbstract:Peña de Bernal is a Natural Monument located near the town of Bernal, in Querétaro State, central Mexico. It is one of the tallest monoliths of the world, with a maximum height of 433 m. Peña de Bernal was recently declared Intangible Cultural Heritage of Humanity Patrimony by United Nations Educational, Scientific, and Cultural Organization (UNESCO). In spite of being both a Natural and cultural Monument, little is known about its origin, physical characteristics, and chemical composition. It is a leucocratic-igneous rock intruding marine Mesozoic sedimentary rocks and has been misinterpreted as a pluton of Eocene or older age. However, this study shows that Peña de Bernal is a dacitic dome with SiO2 = 67 wt% and an age of 8.7 ± 0.2 Ma. The complete Peña de Bernal body includes three plugs that crop out in an ∼3.5 × 1.5 km area elongated N40°E. Texture of the rock is porphyritic, nearly holocrystalline (80 vol% crystals and 20 vol% glass), with a mineral assemblage of pyroxene, hornblende, biotite, plagioclase, and quartz, plus accessory apatite and zircon. Peña de Bernal dacite is a spine-type endogenous dome that was forcefully intruded through the Mesozoic sequence practically as a solid plug.
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Geologic setting of the Peña de Bernal Natural Monument, Querétaro, México: An endogenous volcanic dome
Geosphere, 2013Co-Authors: Gerardo J. Aguirre-diaz, Alfredo Aguillón-robles, Margarito Tristán-gonzález, Guillermo Labarthe-hernández, Margarita Lopez-martinez, Hervé Bellon, Jorge Nieto-obregonAbstract:Pena de Bernal is a Natural Monument located near the town of Bernal, in Queretaro State, central Mexico. It is one of the tallest monoliths of the world, with a maximum height of 433 m. Pena de Bernal was recently declared Intangible Cultural Heritage of Humanity Patrimony by United Nations Educational, Scientific, and Cultural Organization (UNESCO). In spite of being both a Natural and cultural Monument, little is known about its origin, physical characteristics, and chemical composition. It is a leucocratic-igneous rock intruding marine Mesozoic sedimentary rocks and has been misinterpreted as a pluton of Eocene or older age. However, this study shows that Pena de Bernal is a dacitic dome with SiO 2 = 67 wt% and an age of 8.7 ± 0.2 Ma. The complete Pena de Bernal body includes three plugs that crop out in an ∼3.5 × 1.5 km area elongated N40°E. Texture of the rock is porphyritic, nearly holocrystalline (80 vol% crystals and 20 vol% glass), with a mineral assemblage of pyroxene, hornblende, biotite, plagioclase, and quartz, plus accessory apatite and zircon. Pena de Bernal dacite is a spine-type endogenous dome that was forcefully intruded through the Mesozoic sequence practically as a solid plug.
Gerardo J. Aguirre-diaz - One of the best experts on this subject based on the ideXlab platform.
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Geologic setting of the Peña de Bernal Natural Monument, Querétaro, México: An endogenous volcanic dome
Geosphere, 2013Co-Authors: Gerardo J. Aguirre-diaz, Alfredo Aguillón-robles, Margarito Tristán-gonzález, Guillermo Labarthe-hernández, Margarita Lopez-martinez, Hervé Bellon, Jorge Nieto-obregonAbstract:Peña de Bernal is a Natural Monument located near the town of Bernal, in Querétaro State, central Mexico. It is one of the tallest monoliths of the world, with a maximum height of 433 m. Peña de Bernal was recently declared Intangible Cultural Heritage of Humanity Patrimony by United Nations Educational, Scientific, and Cultural Organization (UNESCO). In spite of being both a Natural and cultural Monument, little is known about its origin, physical characteristics, and chemical composition. It is a leucocratic-igneous rock intruding marine Mesozoic sedimentary rocks and has been misinterpreted as a pluton of Eocene or older age. However, this study shows that Peña de Bernal is a dacitic dome with SiO2 = 67 wt% and an age of 8.7 ± 0.2 Ma. The complete Peña de Bernal body includes three plugs that crop out in an ∼3.5 × 1.5 km area elongated N40°E. Texture of the rock is porphyritic, nearly holocrystalline (80 vol% crystals and 20 vol% glass), with a mineral assemblage of pyroxene, hornblende, biotite, plagioclase, and quartz, plus accessory apatite and zircon. Peña de Bernal dacite is a spine-type endogenous dome that was forcefully intruded through the Mesozoic sequence practically as a solid plug.
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Geologic setting of the Peña de Bernal Natural Monument, Querétaro, México: An endogenous volcanic dome
Geosphere, 2013Co-Authors: Gerardo J. Aguirre-diaz, Alfredo Aguillón-robles, Margarito Tristán-gonzález, Guillermo Labarthe-hernández, Margarita Lopez-martinez, Hervé Bellon, Jorge Nieto-obregonAbstract:Pena de Bernal is a Natural Monument located near the town of Bernal, in Queretaro State, central Mexico. It is one of the tallest monoliths of the world, with a maximum height of 433 m. Pena de Bernal was recently declared Intangible Cultural Heritage of Humanity Patrimony by United Nations Educational, Scientific, and Cultural Organization (UNESCO). In spite of being both a Natural and cultural Monument, little is known about its origin, physical characteristics, and chemical composition. It is a leucocratic-igneous rock intruding marine Mesozoic sedimentary rocks and has been misinterpreted as a pluton of Eocene or older age. However, this study shows that Pena de Bernal is a dacitic dome with SiO 2 = 67 wt% and an age of 8.7 ± 0.2 Ma. The complete Pena de Bernal body includes three plugs that crop out in an ∼3.5 × 1.5 km area elongated N40°E. Texture of the rock is porphyritic, nearly holocrystalline (80 vol% crystals and 20 vol% glass), with a mineral assemblage of pyroxene, hornblende, biotite, plagioclase, and quartz, plus accessory apatite and zircon. Pena de Bernal dacite is a spine-type endogenous dome that was forcefully intruded through the Mesozoic sequence practically as a solid plug.
Kateřina Rebrošová - One of the best experts on this subject based on the ideXlab platform.
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Spatial structure of forest stands Fageta paupera humilia in Natural Monument Máchova dolina
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2014Co-Authors: Jiří Schneider, Kateřina RebrošováAbstract:Cilem výzkumu výse zminěneho projektu bylo srovnani rozdilných porostnich struktur na ctyřech výzkumných plochach v Chřibech (plochy byly založeny v roce 2008). Předmětem výzkumu předkladaneho přispěvku je prostorova struktura PP Machova dolina.Na trvalých výzkumných plochach bylo změřeno 510 stojicich živých stromů - TVP Holý kopec - Rynek 122 jedinců, TVP Holý kopec-sever 232 jedinců a TVP ocasek 124 jedinců na plose 1 hektar, TVP Machova dolina 146jedinců na 0,5 ha.Ekosystem přirodni pamatky Machova dolina patři geobiocenologicky do skupiny typů geobiocenů 3 A (2)3 - Fageta quercina - buciny s dubem, jedna se o biotop L5.4 - acidofilni buciny, z hlediska lesnicke typologie patři do lesniho typu 3K6 - kysela dubova bucina bikova na hřebenech. Jedna se o porosty výmladkoveho původu.Naměřena data z jednotlivých TVP byla zpracovana zakladnimi metodami popisne statistiky. Byly sestrojeny polygony tlousťkových a výskových cetnosti. U ploch byly definovany zakladni produkcni charakteristiky jako zastoupeni, výcetni zakladna, zakmeněni, zasoba aj. Pro informace o diverzitě a struktuře porostu byly vypocteny indexy výskove a tlousťkove diferenciace (Fuldner 1995), horizontalni struktury (Clark a Evans, 1954) a celkove diverzity (Jaehne a Dohrenbusch, 1997). Pro nazornost jsou vsechny porostni situace exportovany v 3D zobrazeni. Digitalni model terenu pro PP Machova dolina uvadi obrazek 9.Zjistěný aktualni stav porostu na trvale výzkumne plose Machova dolina ve stejnojmenne přirodni pamatce a jeho význam pro dalsi management a vývoj ekosystemu ma dva zasadni aspekty. Prvnim je výměra stanovistě, ktera je limitovana geopedologickými podminkami a je tak mala, že neumožňuje umistěni TVP větsi než 0,5 ha. Druhým je velmi nizka kvalita dřevni hmoty, pramenici jednak ze stanovistnich podminek, jednak z pravděpodobneho vegetativniho původu porostu. Proto je možne porost ponechat samovolnemu vývoji, avsak s akcentem na okolni, typologicky odlisne porosty. Souvisla plocha tohoto exponovaneho stanovistě Machovy doliny se sousednimi porosty opět umožni zajistit průběh autoregulacnich mechanismů.
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Spatial structure of forest stands Fageta paupera humilia in Natural Monument Máchova dolina
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2010Co-Authors: Jiří Schneider, Kateřina RebrošováAbstract:Natural Monument “Máchova dolina” represents a unique sample of dwarfed acidic beech forests in Chřiby hills (Buček, Lacina; 2002). It comprises more than 180 years old beech stand time, where according to certain characters (the basal part of deformation strain, frequent occurrence of damage) we can infer that, with the vegetation stool origin. As a result of adverse site conditions and the influence of origin to the emergence of the crop trees have a shape looks like an apple. Forest biocoenoses “Máchova dolina” is bounded to the board and limited site conditions ecosystem surface is less than 0.5 ha. As part of this unique site was established a permanent research area rectangle of dimensions 50 × 100 meters and by the Field-Map technology has been carried out measurements dendrometric variables (see below). The aim of the research was to compare different spatial structures (a total of 4 plots) in beech forest stands in Chřiby hills and knowledge of the functional effects of structurally variant types of forest.The measurement was based on „The methodology of research dynamics of Natural forests left spontaneous development“ (Vrška et al., 2006). When measurements are distinguished tree concepts and strain. The tree indicates the individual, which consists of one or more strains. Focus and describe all strains with DBH of at least 10 cm with bark. For each strain is aimed its location, DBH, height, high-pitched crown, crown projection, set the species of trees and nature of health. In addition to living trees and stumps are aimed „dead wood“, stumping for distinguishing their origin, whether it arose Naturally (break) or artificially (harvesting), all aimed „dead wood“ must originate in the area.The permanent research “Máchova dolina” area the size of 0.5 hectares has been targeted 146 trees. Diameter breast height (DBH) ranging from 10–72 cm; most tribes are represented with DBH between 30–39 cm. Most site conditions reflects vegetation height. Height of trees ranged from 2.5 m to 31.5 m, most often in the range of 15–20 m. For comparison, can be as old stands in a nature reserve on a set of “Holý kopec” forest types 3B, where the average height of vegetation around 38 m (max. 45 m). Surface projections are mostly CZK range of 30–50 m2. Although the vegetation time and even get involved exposure provides sufficient sunshine is no Natural vegetation regeneration.The aim of this article is description of spatial stand structure in Natural Monument Máchova dolina in Chřiby hills.
Margarito Tristán-gonzález - One of the best experts on this subject based on the ideXlab platform.
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Geologic setting of the Peña de Bernal Natural Monument, Querétaro, México: An endogenous volcanic dome
Geosphere, 2013Co-Authors: Gerardo J. Aguirre-diaz, Alfredo Aguillón-robles, Margarito Tristán-gonzález, Guillermo Labarthe-hernández, Margarita Lopez-martinez, Hervé Bellon, Jorge Nieto-obregonAbstract:Peña de Bernal is a Natural Monument located near the town of Bernal, in Querétaro State, central Mexico. It is one of the tallest monoliths of the world, with a maximum height of 433 m. Peña de Bernal was recently declared Intangible Cultural Heritage of Humanity Patrimony by United Nations Educational, Scientific, and Cultural Organization (UNESCO). In spite of being both a Natural and cultural Monument, little is known about its origin, physical characteristics, and chemical composition. It is a leucocratic-igneous rock intruding marine Mesozoic sedimentary rocks and has been misinterpreted as a pluton of Eocene or older age. However, this study shows that Peña de Bernal is a dacitic dome with SiO2 = 67 wt% and an age of 8.7 ± 0.2 Ma. The complete Peña de Bernal body includes three plugs that crop out in an ∼3.5 × 1.5 km area elongated N40°E. Texture of the rock is porphyritic, nearly holocrystalline (80 vol% crystals and 20 vol% glass), with a mineral assemblage of pyroxene, hornblende, biotite, plagioclase, and quartz, plus accessory apatite and zircon. Peña de Bernal dacite is a spine-type endogenous dome that was forcefully intruded through the Mesozoic sequence practically as a solid plug.
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Geologic setting of the Peña de Bernal Natural Monument, Querétaro, México: An endogenous volcanic dome
Geosphere, 2013Co-Authors: Gerardo J. Aguirre-diaz, Alfredo Aguillón-robles, Margarito Tristán-gonzález, Guillermo Labarthe-hernández, Margarita Lopez-martinez, Hervé Bellon, Jorge Nieto-obregonAbstract:Pena de Bernal is a Natural Monument located near the town of Bernal, in Queretaro State, central Mexico. It is one of the tallest monoliths of the world, with a maximum height of 433 m. Pena de Bernal was recently declared Intangible Cultural Heritage of Humanity Patrimony by United Nations Educational, Scientific, and Cultural Organization (UNESCO). In spite of being both a Natural and cultural Monument, little is known about its origin, physical characteristics, and chemical composition. It is a leucocratic-igneous rock intruding marine Mesozoic sedimentary rocks and has been misinterpreted as a pluton of Eocene or older age. However, this study shows that Pena de Bernal is a dacitic dome with SiO 2 = 67 wt% and an age of 8.7 ± 0.2 Ma. The complete Pena de Bernal body includes three plugs that crop out in an ∼3.5 × 1.5 km area elongated N40°E. Texture of the rock is porphyritic, nearly holocrystalline (80 vol% crystals and 20 vol% glass), with a mineral assemblage of pyroxene, hornblende, biotite, plagioclase, and quartz, plus accessory apatite and zircon. Pena de Bernal dacite is a spine-type endogenous dome that was forcefully intruded through the Mesozoic sequence practically as a solid plug.
Hervé Bellon - One of the best experts on this subject based on the ideXlab platform.
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Geologic setting of the Peña de Bernal Natural Monument, Querétaro, México: An endogenous volcanic dome
Geosphere, 2013Co-Authors: Gerardo J. Aguirre-diaz, Alfredo Aguillón-robles, Margarito Tristán-gonzález, Guillermo Labarthe-hernández, Margarita Lopez-martinez, Hervé Bellon, Jorge Nieto-obregonAbstract:Peña de Bernal is a Natural Monument located near the town of Bernal, in Querétaro State, central Mexico. It is one of the tallest monoliths of the world, with a maximum height of 433 m. Peña de Bernal was recently declared Intangible Cultural Heritage of Humanity Patrimony by United Nations Educational, Scientific, and Cultural Organization (UNESCO). In spite of being both a Natural and cultural Monument, little is known about its origin, physical characteristics, and chemical composition. It is a leucocratic-igneous rock intruding marine Mesozoic sedimentary rocks and has been misinterpreted as a pluton of Eocene or older age. However, this study shows that Peña de Bernal is a dacitic dome with SiO2 = 67 wt% and an age of 8.7 ± 0.2 Ma. The complete Peña de Bernal body includes three plugs that crop out in an ∼3.5 × 1.5 km area elongated N40°E. Texture of the rock is porphyritic, nearly holocrystalline (80 vol% crystals and 20 vol% glass), with a mineral assemblage of pyroxene, hornblende, biotite, plagioclase, and quartz, plus accessory apatite and zircon. Peña de Bernal dacite is a spine-type endogenous dome that was forcefully intruded through the Mesozoic sequence practically as a solid plug.
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Geologic setting of the Peña de Bernal Natural Monument, Querétaro, México: An endogenous volcanic dome
Geosphere, 2013Co-Authors: Gerardo J. Aguirre-diaz, Alfredo Aguillón-robles, Margarito Tristán-gonzález, Guillermo Labarthe-hernández, Margarita Lopez-martinez, Hervé Bellon, Jorge Nieto-obregonAbstract:Pena de Bernal is a Natural Monument located near the town of Bernal, in Queretaro State, central Mexico. It is one of the tallest monoliths of the world, with a maximum height of 433 m. Pena de Bernal was recently declared Intangible Cultural Heritage of Humanity Patrimony by United Nations Educational, Scientific, and Cultural Organization (UNESCO). In spite of being both a Natural and cultural Monument, little is known about its origin, physical characteristics, and chemical composition. It is a leucocratic-igneous rock intruding marine Mesozoic sedimentary rocks and has been misinterpreted as a pluton of Eocene or older age. However, this study shows that Pena de Bernal is a dacitic dome with SiO 2 = 67 wt% and an age of 8.7 ± 0.2 Ma. The complete Pena de Bernal body includes three plugs that crop out in an ∼3.5 × 1.5 km area elongated N40°E. Texture of the rock is porphyritic, nearly holocrystalline (80 vol% crystals and 20 vol% glass), with a mineral assemblage of pyroxene, hornblende, biotite, plagioclase, and quartz, plus accessory apatite and zircon. Pena de Bernal dacite is a spine-type endogenous dome that was forcefully intruded through the Mesozoic sequence practically as a solid plug.
