Hacia una teoría galáctica del catastrofismo terrestre

The contemporary theories of terrestrial catastrophism are briefly reviewed. The role of Apollo-objects and some historical references to Tunguska-type cases are shortly described. Since the likely galactic origin of periodicities in the terrestrial record, the possibility that encounters with GMCs...

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Detalles Bibliográficos
Autor principal: Olano, Carlos Alberto
Formato: Articulo Comunicacion
Lenguaje:Español
Publicado: 1993
Materias:
Astronomía
Galaxia
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/147146
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-147146
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spelling I19-R120-10915-1471462024-04-09T16:36:15Z http://sedici.unlp.edu.ar/handle/10915/147146 Hacia una teoría galáctica del catastrofismo terrestre Olano, Carlos Alberto 1993 2022-12-13T12:50:00Z es Astronomía Galaxia The contemporary theories of terrestrial catastrophism are briefly reviewed. The role of Apollo-objects and some historical references to Tunguska-type cases are shortly described. Since the likely galactic origin of periodicities in the terrestrial record, the possibility that encounters with GMCs perturbed the Oort cloud is analyzed. The galactic orbits of the Sun and nearby GMCs were determined for the last 40 Myr. The result is that the Sun encountered probably Ori OBI and Mon OBI Clouds in coincidence with the dates of the Miocene and Eocene mass extinctions (see Figs.l, 2, 3 and 4). It is proposed that the Sun was for 250 Myr captive of a supercloud or association of GMCs (Gould's belt), of which the progenitors of Ori OBI and Mon OBI formed part. A computer simulation of Sun's orbit relative to the hypothetical cloud, to which the Sun would have been physically attached, is presented (see Figs. 5 and 6). The 25-30/13-15 Myr quasi-periodicities in the terrestrial record can be explained by the model. Asociación Argentina de Astronomía Articulo Comunicacion http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Astronomía
Galaxia
spellingShingle Astronomía
Galaxia
Olano, Carlos Alberto
Hacia una teoría galáctica del catastrofismo terrestre
topic_facet Astronomía
Galaxia
description The contemporary theories of terrestrial catastrophism are briefly reviewed. The role of Apollo-objects and some historical references to Tunguska-type cases are shortly described. Since the likely galactic origin of periodicities in the terrestrial record, the possibility that encounters with GMCs perturbed the Oort cloud is analyzed. The galactic orbits of the Sun and nearby GMCs were determined for the last 40 Myr. The result is that the Sun encountered probably Ori OBI and Mon OBI Clouds in coincidence with the dates of the Miocene and Eocene mass extinctions (see Figs.l, 2, 3 and 4). It is proposed that the Sun was for 250 Myr captive of a supercloud or association of GMCs (Gould's belt), of which the progenitors of Ori OBI and Mon OBI formed part. A computer simulation of Sun's orbit relative to the hypothetical cloud, to which the Sun would have been physically attached, is presented (see Figs. 5 and 6). The 25-30/13-15 Myr quasi-periodicities in the terrestrial record can be explained by the model.
format Articulo
Comunicacion
author Olano, Carlos Alberto
author_facet Olano, Carlos Alberto
author_sort Olano, Carlos Alberto
title Hacia una teoría galáctica del catastrofismo terrestre
title_short Hacia una teoría galáctica del catastrofismo terrestre
title_full Hacia una teoría galáctica del catastrofismo terrestre
title_fullStr Hacia una teoría galáctica del catastrofismo terrestre
title_full_unstemmed Hacia una teoría galáctica del catastrofismo terrestre
title_sort hacia una teoría galáctica del catastrofismo terrestre
publishDate 1993
url http://sedici.unlp.edu.ar/handle/10915/147146
work_keys_str_mv AT olanocarlosalberto haciaunateoriagalacticadelcatastrofismoterrestre
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