Imperial College London
Portrait Picture

Emeritus ProfessorLidiaLonergan

Faculty of Engineering, Department of Earth Science & Engineering

Emeritus Reader of Geotectonics
 
 
 
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Contact

 

+44 (0)20 7594 6465l.lonergan Website

 
 
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Location

 

3.48Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Doughty-Jones:2019:10.1016/j.marpetgeo.2019.03.015,
author = {Doughty-Jones, G and Lonergan, L and Mayall, M and Dee, S},
doi = {10.1016/j.marpetgeo.2019.03.015},
journal = {Marine and Petroleum Geology},
pages = {106--124},
title = {The role of structural growth in controlling the facies and distribution of mass transport deposits in a deep-water salt minibasin},
url = {http://dx.doi.org/10.1016/j.marpetgeo.2019.03.015},
volume = {104},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We distinguish two types of mass-transport deposits (MTDs) within a salt-related slope minbasin. The locally-derived MTDs are sourced from growing structures bounding the minbasin, and the more extensive, regional, MTDs are sourced from the shelf of the continental margin, at least 100km east of the study area. The two types of MTDs have different internal characteristics, distribution within the basin and depositional mechanisms. Using a high-resolution 3D seismic dataset we characterise the internal structures and dimensions of the MTDs, and also quantify the deformation history of the salt structures. Through these analyses we demonstrate that the ‘local’ and ‘regional’ MTDs react in different ways to growth on the structures within, and bounding, the slope minbasin.The regionally derived MTDs are debris flows, with individual deposits up to 300m thick and covering an area of up to 1300km2 within the minbasin. Seismic facies analysis suggests they are mostly composed of chaotic material but in some places contain discrete blocks of sediment ranging from 50m to 250m in length. In contrast, the more locally derived MTDs are submarine slides consisting of translated material from the flanks of salt structures. Each slide has an up-dip extensional domain with normal faults and a down-dip contractional domain with thrusts and folds. They cover areas between 11 and 28km2 with frontal and lateral ramps up to 200m high. Relict topography on the top surface of the MTDs is infilled with younger sediment.Shortening analysis of the intra-slope salt structures within and bounding the minbasin is used as a proxy for the growth rate of the structures. This novel approach of combining shortening with the detailed observations of the local and regional MTDs has allowed us to draw new conclusions on the relationship between structural growth and MTD initiation. Local MTDs either form during periods of high structural growth (10–30 m/ma) or in a
AU  - Doughty-Jones,G
AU  - Lonergan,L
AU  - Mayall,M
AU  - Dee,S
DO  - 10.1016/j.marpetgeo.2019.03.015
EP  - 124
PY  - 2019///
SN  - 0264-8172
SP  - 106
TI  - The role of structural growth in controlling the facies and distribution of mass transport deposits in a deep-water salt minibasin
T2  - Marine and Petroleum Geology
UR  - http://dx.doi.org/10.1016/j.marpetgeo.2019.03.015
UR  - https://www.sciencedirect.com/science/article/abs/pii/S0264817219301059
UR  - http://hdl.handle.net/10044/1/67726
VL  - 104
ER  -
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