Premium
Dinantian sedimentation and the basement structure of the Derbyshire Dome
Author(s) -
Gutteridge Peter
Publication year - 1987
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350220104
Subject(s) - geology , basement , onlap , carbonate , dome (geology) , sedimentary depositional environment , evaporite , fault block , carbonate platform , fault (geology) , paleontology , structural basin , geomorphology , sedimentation , petrology , geochemistry , sediment , civil engineering , materials science , engineering , metallurgy
Abstract The depositional history of the Dinantian on the Derbyshire Dome can be divided into three phases: (1) pre‐Holkerian: onlap of an irregular basement surface by evaporite and carbonate sediments, (2) Holkerian to Asbian: sedimentation on a carbonate shelf formed by the merging of early Dinantian depocentres following burial of the basement topography, and (3) Brigantian: formation of intrashelf basins and the development of a carbonate ramp on part of the pre‐existing shelf. A model of the basement structure underlying the Derbyshire Dome is presented to explain the location of the Brigantian intrashelf basins and carbonate ramp. The basement consists of two main tilted fault blocks separated by a smaller tilt block. Movement on faults bounding the tilt blocks caused the development of intrashelf basins. The basin margins were controlled by structures which developed in the cover sediments. The carbonate ramp present during the late Brigantian developed in response to an eastward tilting of the basement.