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- Detachments in Oceanic lithosphere : Deformation, Magmatism, Fluid Flow and Ecosystems
Detachments in Oceanic lithosphere : Deformation, Magmatism, Fluid Flow and Ecosystems
Collectivite Auteur :
American Geophysical Union
Date de publication : 08/05/2010
Type : Rapport
Thème : Lithosphère
Couverture :
Etats-Unis d'Amérique
URL Article :
http://www.agu.org/meetings/chapman/2010/dcall/pdf/Conference_Summary.pdfURL Source :
http://www.agu.org 
Télécharger le document :
(2,81 MB) detachment_oceanic_lithosphere.pdfRésumé/Sommaire :
Since their discovery about 10 years ago, oceanic core complexes (OCCs) are now known to form by exhumation of large lithospheric sections by long-lived detachment faults along the flanks of mid-ocean ridges. In recent times, OCCs have been identified along mid-ocean ridges where seafloor spreading occurs at ultra-slow to intermediate rates, and have increasingly attracted the interest of a diverse group of geoscientists, and of biologists in more recent times. These structures are actively debated as representing, among many other things :
- tectonic windows providing access to deep-seated rocks and processes, allowing studies of mantle flow, melt generation and migration, strain localization, and crustal accretion at mid-ocean ridges ;
- a fundamental process in the generation of oceanic lithosphere that can be responsible for >50% of lithospheric accretion along slow and ultra-slow spreading centers ;
- a system that provides a unique setting for sustaining both long-lived, hightemperature hydrothermal circulation as well as low-temperature, hydrogen-rich,
serpentinite-related hydrothermal systems, and their associated mineral deposits and micro- and macro-biota ;
- a fault zone, containing weak hydrous alteration phases, that localizes strain over extended periods of time (in some instances up to a few million years), with associated flexure and rotation of the footwall ;
- a key to understand continental metamorphic core complexes formed in settings of extreme tectonic extension, as well as to detachment faults associated with extensional magma-poor continental margins.
The increased interest of the scientific community in OCCs has been demonstrated during the last few years by the inclusion of special sessions in many of the most important Earth Sciences' meetings (e.g., American Geophysical Union, European
Geophysical Union, Geological Society of America), featuring directly or indirectly the latest research on these structures. These sessions reflect an important effort by the community in terms of recent and on-going research projects, as well as the publication of recent results in peer-reviewed journals. In order to advance understanding of the fundamental processes that control OCC formation and evolution, and associated geological, chemical, and biological phenomena, a multi-day conference focused solely on OCCs is now very timely.
We are convening a Chapman Conference on Detachments in Oceanic Lithosphere : Deformation, Magmatism, Fluid Flow, and Ecosystems because this field is ripe for a topical conference, with a rich body of published and on-going research exists. By bringing together a multidisciplinary, diverse group of bio- and geoscientists with very different interests but all linked to detachment faulting, the conference will synthesize our current knowledge of OCC and oceanic detachment faulting, and related processes; identify the relevant questions that will hone our ability to understand the underlying mechanisms of OCC formation and evolution; and set the stage for the next decade on the key observations and modeling that need to be developed to address those questions.
The meeting will take place over 7 days, and it will include oral and poster presentations, ample time for discussions, and field trips. The location will be Cyprus because of its easy access to Troodos Ophiolite, where excellent examples of crustal/mantle sections, hydrothermal deposits, and detachment faults can be observed. Participants will be encouraged to submit papers to a refereed proceedings volume such as AGU Geophysical Monograph or a special edition of an international, high-impact journal.
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