Imperial College London
Alternate

Emeritus ProfessorHowardJohnson

Faculty of Engineering, Department of Earth Science & Engineering

Emeritus Professor of Reservoir Geology
 
 
 
//

Contact

 

+44 (0)20 7594 6450h.d.johnson

 
 
//

Location

 

3.48Royal School of MinesSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Jackson:2009:10.1016/j.marpetgeo.2009.02.019,
author = {Jackson, CA-L and Johnson, HD and Zakaria, AA and Tongkul, F and Crevello, PD},
doi = {10.1016/j.marpetgeo.2009.02.019},
journal = {Marine and Petroleum Geology},
pages = {1957--1973},
title = {Sedimentology, stratigraphic occurrence and origin of linked debrites in the West Crocker Fm (Oligo-Miocene), Sabah, NW Borneo},
url = {http://dx.doi.org/10.1016/j.marpetgeo.2009.02.019},
volume = {26},
year = {2009}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The West Crocker Fm (Oligocene-Early Miocene), NW Borneo, consists of a large (>20000 km2) submarine fan deposited as part of an accretionary complex. A range of gravity-flow deposits are observed, the most significant of which are mud-poor, massive sandstones interpreted as turbidites and clast-rich, muddy sandstones and sandy mudstones interpreted as debrites. An upward transition from turbidite to debrite is commonly observed, with the contact being either gradational and planar, or sharp and highly erosive. Their repeated vertical relationship and the nature of the contact between them, these intervals are interpreted as being deposited from one flow event which consisted of two distinct flow phases (fully turbulent turbidity current and weakly turbulent to laminar debris flow). The associated bed is called a co-genetic turbidite-debrite, with the upper debrite interval termed a linked debrite. Linked debrites indicates are best developed in the non-channelised parts of the fan system, and are absent to poorly-developed in the proximal channel-levee and distal basin floor environments. Due to outcrop limitations, the genesis of linked debrites within the West Crocker Formation is unclear. Based on clast size and type, it seems likely that a weakly turbulent to laminar debris-flow flow phase was present when the flow event entered the basin. A change in flow behaviour may have led to deposition of a sand-rich unit with ‘turbidite’ characteristics, which was subsequently overlain by a mud-rich unit with ‘debrite’ characteristics. Flow transformation may have been enhanced by the disintegration and incorporation into the flow of muddy clasts derived from the upstream channel floor, channel mouth or from channel levee collapse. Lack of preservation of this debrite in proximal areas may indicate either bypass of this flow phase or that the available outcrops fail to capture the debris flow entry point. Establishing robust sedimentological c
AU  - Jackson,CA-L
AU  - Johnson,HD
AU  - Zakaria,AA
AU  - Tongkul,F
AU  - Crevello,PD
DO  - 10.1016/j.marpetgeo.2009.02.019
EP  - 1973
PY  - 2009///
SP  - 1957
TI  - Sedimentology, stratigraphic occurrence and origin of linked debrites in the West Crocker Fm (Oligo-Miocene), Sabah, NW Borneo
T2  - Marine and Petroleum Geology
UR  - http://dx.doi.org/10.1016/j.marpetgeo.2009.02.019
VL  - 26
ER  -
Download