Yohann Poprawski

• Phd degree in geology : “The northern margin of the Basque Trough during Albian : sedimentary architecture and diapir growth in strike-slip settings (Basque Country)”
• Independant geologist | www.geologic-diffusion.com at none

In diapir flanks, unconformity-bounded sedimentary packages associated with gravity-driven deposits, controlled by the ratio between the rates of sediment accumulation and diapir growth can be interpreted in the context of halokinetic sequences. The Bakio Breccias Formation (Basque Country, Spain) corresponds to redeposited carbonate deposit that d...

However salt has a viscous rheology, overburden rocks adjacent to salt diapirs have a brittle rheology. Evidence of deformation within the overburden has been described from diapirs worldwide. Gravity-driven deposits are also present along the flanks of several diapirs. The well-known example from the La Popa Basin in northern Mexico shows that suc...

Many coasts feature sequences of Quaternary and Neogene shorelines that are shaped by a combination of sea-level oscillations and tectonics. We compiled a global synthesis of sea-level changes for the following highstands: MIS 1, MIS 3, MIS 5e and MIS 11. Also, we date the apparent onset of sequences of paleoshorelines either from published data or...

Located in the northeast of the Cotentin Peninsula (Normandy, France), Cul-de-Loup Bay is currently undergoing significant hydro-sedimentary changes, marked by silting and coastal erosion. To better understand the future evolution of this back-bay environment, a study was conducted to analyze sedimentary deposits dating back to the Iron Age (2750 B...

Kongsfjorden (Svalbard archipelago) is subjected to strong environmental gradients creating high physical and geochemical stress on benthic faunas. The present study aims at understanding the environmental drivers governing benthic foraminifera in the innermost part of the fjord. Surface sediments from 9 stations were sampled during August 2018 alo...

Recent subsurface studies show that mass-transport deposits (MTDs) in salt-controlled basins may correspond to local or regional bodies induced by either regional tectonics, or diapir growth. These MTDs are commonly considered as muddy bodies but they may alternatively incorporate a high amount of clasts and reworked beds with good reservoir proper...

Behavior of sediment gravity flows can be influenced by seafloor topography associated with salt structures; this can modify the depositional architecture of deep-water sedimentary systems. Typically, salt-influenced deep-water successions are poorly imaged in seismic reflection data, and exhumed systems are rare, hence the detailed sedimentology a...

Les résurgences hydrothermales sont nombreuses dans les Pyrénées, elles témoignent de circulations d'eaux chauffées en profondeur. Une étude couplant activité sismique des Pyrénées et localisation des résurgences a été menée : les résultats soulignent une remarquable corrélation entre les zones sismiquement actives et les régions où se concentrent...

Folder kmz (Virtual Fieldtrip on Google Earth) with the geolocation of the main analyzed field localities, geological maps, and cross-sections from the Tectono-Sedimentary Evolution of Jurassic-Cretaceous diapiric structures: Miravete anticline, Maestrat Basin, Spain paper published in Basin Research Open Access by the authors. Assembled by Cristi...

Integration of extensive fieldwork, remote sensing mapping and 3D models from high quality drone photographs relates tectonics and sedimentation to define the Jurassic–early Albian diapiric evolution of the N‐S Miravete anticline, the NW‐SE Castel de Cabra anticline and the NW‐SE Cañada Vellida ridge in the Maestrat basin (Iberian Ranges, Spain). T...

Sediment gravity flow behaviour is influenced by seafloor topography associated with salt structures, which controls the depositional architecture of deep-water sedimentary systems. Typically, salt-influenced deep-water successions are poorly-imaged in seismic reflection data and exhumed systems are rare, hence the detailed sedimentology and strati...

We present a high-resolution 1:15,000 bathymetric map (Main map) of Alderney Race located offshore of northwestern France, with the strongest currents in Europe. We use this map, underwater video transects and Shipek grabs to improve geological maps previously published. We distinguished Proterozoic crystalline rocks, Paleozoic and Cretaceous sedim...

The occurrence of wide‐spread coral species around isolated reefs and over long stretches of deep ocean cannot be explained by larval dispersal alone; their larval stage is too short for that, especially in brooding species (Nunes et al. 2011, de Souza et al. 2017). Rafting on natural substrates, such as volcanic pumice fragments, wooden logs and c...

The Basque-Cantabrian basin is located in northern Spain in the westernmost part of the Pyrenees. It is a Mesozoic rift, inverted during the Tertiary. In this basin, a subsiding deep-water depocenter, called the Basque Trough formed during the Early Cretaceous, in response to the opening of the Bay of Biscay. In the Basque-Cantabrian basin, the Tri...

The Cotentin Peninsula (Normandy, France) displays sequences of marine terraces and rasas, the latter being wide Late Cenozoic coastal erosion surfaces, that are typical of Western European coasts in Portugal, Spain, France and southern England. Remote sensing imagery and field mapping enabled reappraisal of the Cotentin coastal sequences. From bot...

The Basque-Cantabrian Basin is an E-W trending, 200 km wide basin, mainly filled by Cretaceous deposits, located along the northern continental margin of Spain. The basin is linked to the lower Cretaceous rifting (from late Barremian to Early Albian) between iberian and european plates, that resulted in oceanic accretion in the Gulf of Biscay. This...