@article{Alqahtani:2015:10.1111/sed.12185,
author = {Alqahtani, FA and Johnson, HD and Jackson, CA-L and Som, RB},
doi = {10.1111/sed.12185},
journal = {Sedimentology},
pages = {1198--1232},
title = {Nature, origin and evolution of a Late Pleistocene incised valley-fill, Sunda Shelf, Southeast Asia},
url = {http://dx.doi.org/10.1111/sed.12185},
volume = {62},
year = {2015}
}

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TY  - JOUR
AB  - Shallow (<500 ms TWT/c. 500 m sub-sea) 3D seismic reflection data from a large (11500 km2), ‘merge’ survey, supplemented with high-resolution site survey data, have enabled identification and characterisation of a large (up to 18 km wide by 80 m deep) Late Pleistocene incised valley on the Sunda Shelf, offshore eastern Malaysia. The valley-fill displays five large-scale stratigraphic features: (1) it is considerably larger than other seismically-resolvable channel forms and can be traced for at least 180 km along its length within the available 3D seismic volume; (2) it is located in the axial part of the Malay Basin with a_NNW-SSE orientation, which is parallel to the maximum thickness of the underlying Oligo-Miocene succession (the main fill of the Malay Basin); (3) the youngest fill of the valley-fill is dominated by a large (up to 800 m wide and 23 m deep), high-sinuosity channel, with well-developed lateral accretion surfaces, point bars and meander loop cut-offs; (4) the immediately adjacent interfluves contain much smaller, dendritic ‘tributary’ channel systems, which drain into the larger incised valley system, and (5) a ca. 16 m thick, shell-bearing, Holocene age clay caps the valley-fill.  Site survey borehole data from the abandonment part of the large meandering channel at the top of the incised valley-fill display the following: (1) pebbles, gravels and cobbles form a basal channel lag above a prominent, seismically-defined erosional surface; .(2) interbedded fine-grained sandstones and claystones, with shell fragments and terrestrially-derived organic material, form the middle part of the channel-fill; and (3) inclined heterolithic stratification (IHS), visible on high-resolution site survey seismic data, is the dominant macro-scale sedimentary structure.  The interval adjacent to the incised valley comprises muds and silts with dispersed plant material and shell debris. These data document two major depositional environments
AU  - Alqahtani,FA
AU  - Johnson,HD
AU  - Jackson,CA-L
AU  - Som,RB
DO  - 10.1111/sed.12185
EP  - 1232
PY  - 2015///
SN  - 1365-3091
SP  - 1198
TI  - Nature, origin and evolution of a Late Pleistocene incised valley-fill, Sunda Shelf, Southeast Asia
T2  - Sedimentology
UR  - http://dx.doi.org/10.1111/sed.12185
UR  - http://onlinelibrary.wiley.com/doi/10.1111/sed.12185/abstract
UR  - http://hdl.handle.net/10044/1/21283
VL  - 62
ER  - 

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