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Title: SHELF COLLAPSE PROCESSES ON THE LABRADOR SEA MARGIN
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SHELF COLLAPSE PROCESSES ON THE LABRADOR SEA MARGIN
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1314-2704
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English
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20
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1.1
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Development of passive margin, due to thermal cooling of the stretch lithosphere, creates a large accommodation space subsequently filled with sediments brought from the emerging continent once the river system is established [1]. This combination of rapid subsidence and sedimentation generates an instable architecture with large shelf progradation on top of early post-rift sediments [5]. Given the typical fine grain lithology of these deposits, in most of the cases they become overpressure and an ideally zone for a detachment once the slope condition and stability is affected. The shelf collapse will generate a massive submarine land slide and formation of both extensional and compressional domain [1]. Such geometries can also be recognized on the Labrador Sea shelf, where large scale (more than 50 km in length) collapse structures are affecting the Upper Cretaceous-Paleogene age strata. The Labrador Sea is the abandoned branch of North Atlantic rift triple junction, which opens during Lower Cretaceous times in a continental domain, with instalment of spreading center by Upper Cretaceous times, Campanian-Maastrichtian [2]. The oceanic crust/lithosphere development and subsequent expansion continue in the basin center while the rapid cooling and sinking (thermal subsidence) of the previous stretched domain, led to the development of a passive margin. The new created accommodation space has been feed with sediments from the nearby continent, uplifted and eroded, with the accumulation of more than 6 km of sediments.
In the current study we are using the 2D regional seismic data to interpret the geometry of the shelf collapse structures. In our area of interest we have identified two independent structures and the next step was to understand the processes that led to the instability and shelf collapse |
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conference
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20th International Multidisciplinary Scientific GeoConference SGEM 2020
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20th International Multidisciplinary Scientific GeoConference SGEM 2020, 18 - 24 August, 2020
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Proceedings Paper
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STEF92 Technology
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International Multidisciplinary Scientific GeoConference-SGEM
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; C
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295-300
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18 - 24 August, 2020
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website
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cdrom
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6847
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Labrador Sea; shelf collapse; detachment; passive margin; overpressure
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