Titre :

Impact origin for the Hummeln structure (Sweden) and its link to the Ordovician disruption of the L chondrite parent body

Auteur(s) :

Alwmark, C. [Auteur]
Department of Geology [Lund]
Ferriere, L. [Auteur]
Natural History Museum [Vienna] [NHM]
Ormo, J. [Auteur]
Instituto Nacional de Técnica Aeroespacial [INTA]
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Sturkell, E. [Auteur]
Department of Earth Sciences [Gothenburg]

Titre de la revue :

Geology

Numéro :

43

Pagination :

279-282

Date de publication :

2015

Discipline(s) HAL :

Planète et Univers [physics]/Astrophysique [astro-ph]
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
Chimie/Matériaux
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]

Résumé en anglais : [en]

Several studies of meteorites show that a large disruption of an asteroid occurred ca. 470 Ma in our solar system’s asteroid belt. As a consequence, a large number of meteorite impacts occurred on Earth during the following ...
Lire la suite >Several studies of meteorites show that a large disruption of an asteroid occurred ca. 470 Ma in our solar system’s asteroid belt. As a consequence, a large number of meteorite impacts occurred on Earth during the following few million years. The finding and characterization, for the first time, of planar deformation features in quartz grains from rocks collected at the Middle Ordovician Hummeln structure (Sweden) prove the hypervelocity impact origin of the structure. The unambiguous shock features allow us to close an ∼200-yr-old discussion about its origin, and further the hypothesis of enhanced asteroid bombardment during the Middle Ordovician, adding an impact crater to the increasing number confirmed and properly dated from this period. Despite its relatively small size (∼1.2 km in diameter), similar to the young Meteor Crater (Arizona, USA), and its old age, the Hummeln structure is remarkably well preserved, contradicting the general assumption that small craters are not preserved on Earth for more than a few tens of thousands to a couple of million years.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
ENSCL
CNRS
INRA

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Matériaux Terrestres et Planétaires

Date de dépôt :

2019-05-16T16:45:24Z
2021-02-16T09:12:30Z