Hatton Basin
The Hatton Basin is a ca. 600 km long SW–NE trending sedimentary basin, located off the west coast of Ireland. It lies between the Hatton and Edoras Banks to the west and the Rockall Bank to the east. The basin contains about 4,000 m of sediments of probable Cretaceous to Cenozoic age.[1] Its relationship to the Rockall Basin remains uncertain.
Fill
[edit]Only the uppermost part of the fill of the Hatton Basin is known with certainty, based on DSDP boreholes (sites 116 & 117) and ODP borehole 982. The interpretation of the deeper parts relies on correlation with older sequences known from the Hatton Bank.[1]
The basement is thought to consist of metamorphic rocks of Paleoproterozoic age, based on sampling from the Rockall High. The oldest sedimentary rocks proven in the area are Albian (uppermost Lower Cretaceous) mudstones and sandstones, encountered in two British Geological Survey boreholes drilled on the Hatton Bank.[1] By comparison with neighbouring basins both Paleozoic and Mesozoic sequences are expected to be present in the Hatton Basin.
The proven Cenozoic sequence starts with Paleocene lavas, part of the North Atlantic Igneous Province, overlain by Eocene claystones. There is then a major hiatus, with the next youngest preserved strata above the unconformity (known regionally as C30) being of Upper Eocene to Lower Oligocene age.[2] The remainder of the sequence consists of Miocene to Pleistocene calcareous oozes.[3]
Development
[edit]The basin is understood to be a result of rifting within the Hatton–Rockall plateau. The age of the rifting is poorly constrained, but is thought to be of Cretaceous age.[1] From wide-angle seismic profiles over the basin and the adjacent highs, a stretching factor of about 2 has been estimated.[3]
References
[edit]- ^ a b c d McInroy, D.; Hitchen, K. (2008). "Geological evolution and hydrocarbon potential of the Hatton Basin (UK sector), northeast Atlantic Ocean" (PDF). Central Atlantic Conjugate Margins Conference, Halifax, Nova Scotia, Canada, 13-15 August 2008. Retrieved 10 October 2019.
- ^ Hitchen, K. (2004). "The geology of the UK Hatton-Rockall margin". Marine and Petroleum Geology. 21 (8): 993–1012. doi:10.1016/j.marpetgeo.2004.05.004.
- ^ a b Smith, L.K.; White, R.S.; Kusznir, N.J.; iSIMM Team (2005). "Structure of the Hatton Basin and adjacent continental margin" (PDF). In Doré, A.G.; Vining, B.A. (eds.). Petroleum Geology: North-West Europe and Global Perspectives—Proceedings of the 6th Petroleum Geology Conference. Geological Society, London. doi:10.1144/0060947. ISBN 9781862391642. S2CID 59142845. Archived from the original (PDF) on 2019-10-11.