caa a22 4500 386402221 CHVBK 20180307112204.0 cr unu---uuuuu 161130e198903 xx s 000 0 eng 10.1017/S0016756800006324 doi S0016756800006324 pii (NATIONALLICENCE)cambridge-10.1017/S0016756800006324 Arthur M. J. Marine Geophysics and Offshore Services Research Programme, British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, U.K.. The Cenozoic evolution of the Lundy Pull-Apart Basin into the Lundy Rhomb Horst [Elektronische Daten] [M. J. Arthur] The NW-SE Cornubian fault zones (FZs) continue to southwest Wales, where they caused dextral offsets during the late Stephanian. A fault bounded area of Devonian-Carboniferous strata, intruded by the Tertiary Lundy Igneous Complex, forms the Lundy Rhomboid. It originated as the Lundy Rhomb Graben, created by 28-40 km of Tertiary sinistral strike-slip faulting along the left-stepping NW-SE Sticklepath-Lustleigh FZ (SLFZ). Tertiary sedimentation in the graben was accompanied by intrusion of the 2.5-4.0 km thick igneous complex into its basement. Sedimentation later spread beyond the graben to form a ‘steer's horns' basin, of which the Stanley Bank and West Lundy basins are remnants. The strata of the rhomb graben and the ‘steer's horns' basin constituted the perhaps 4 km deep Lundy Pull-Apart Basin. Subsequent relatively minor dextral faulting on the left-stepping SLFZ inverted the graben into the Lundy Rhomb Horst; the basement of the graben was uplifted ≮ 1-2 km (net) and exposed by erosion of the Tertiary strata. The pull-apart basin developed at the intersection of reactivated Hercynian NW-SE transform FZs, and E-W subduction zone thrusts. Cenozoic N-S tensional and compressional reactivations of the thrusts were respectively associated with transtensional development of the pull-apart basin, transpressional of the rhomb horst. Copyright © Cambridge University Press 1989 Geological Magazine Cambridge University Press 126/2(1989-03), 187-198 0016-7568 126:2<187 1989 126 GEO https://doi.org/10.1017/S0016756800006324 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016756800006324 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Arthur M. J. Marine Geophysics and Offshore Services Research Programme, British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, U.K NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/2(1989-03), 187-198 0016-7568 126:2<187 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge