From microcontinents to extensional allochthons: witnesses of how continents rift and break apart?
| Autor: | Gwenn Péron-Pinvidic, Gianreto Manatschal |
|---|---|
| Přispěvatelé: | SCHOLASTIQUE, ELODIE, Dynamique de la lithosphère et des bassins sédimentaires (IPGS) (IPGS-Dylbas), Institut de physique du globe de Strasbourg (IPGS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
| Rok vydání: | 2010 |
| Předmět: |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics
Rift 010504 meteorology & atmospheric sciences [SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics Geology Crust 010502 geochemistry & geophysics 01 natural sciences Mantle (geology) Geobiology Tectonics Fuel Technology Geochemistry and Petrology Lithosphere Magmatism Earth and Planetary Sciences (miscellaneous) Economic Geology 14. Life underwater Palaeogeography ComputingMilieux_MISCELLANEOUS Seismology 0105 earth and related environmental sciences |
| Zdroj: | Petroleum Geoscience Petroleum Geoscience, Geological Society, 2010, 16, pp.189-197 |
| ISSN: | 2041-496X 1354-0793 |
| DOI: | 10.1144/1354-079309-903 |
| Popis: | The conjunction of high-quality seismic surveys, deep sea drilling, and progress in numerical modelling has changed the way of thinking about how continents rift and oceans form. In particular the discovery of exhumed continental mantle and hyper-extended crust in deep-water rifted margins has led to a paradigm shift in research into the evolution of rifted margins. Although rifted margins now appear to be more complex and their architecture more diverse than previously thought, their study worldwide shows that there are in fact a limited number of structures observed in seismic images that characterize their architecture. These ‘building stones’ include crustal blocks of various sizes, often referred to as microcontinents, continental ribbons, H-blocks, extensional allochthons and outer highs. The aim of this paper is to define the characteristics of these continental blocks and to describe their relationship and position within the rifted margins, and to understand the underlying processes that govern their formation. We propose, using the example of the North Atlantic, that these crustal blocks are the result of specific rift processes that correspond to the sequential evolution from stretching, to thinning and exhumation of the continental lithosphere. We show that the relationship between the various rift structures provides fundamental insights into the controlling processes that thin and finally rupture continental lithosphere. |
| Databáze: | OpenAIRE |
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