Deltas: Sites and Traps for Fossil Fuels (Geological Society by Michael K. G. Whateley, K. T. Pickering

By Michael K. G. Whateley, K. T. Pickering

This quantity of 23 papers, comprising many points of recent and historic deltaic sedimentary structures, is meant as an outline of this topic for using scholars, academics and researchers alike.

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Extra info for Deltas: Sites and Traps for Fossil Fuels (Geological Society Special Publication No. 41)

Example text

E. F a r r o w 4~ 3~ 2~ 1~ W (Y' 1~ E ooo 2~ 3~ • I Act'vFauI e tEAST I Middte V o l g l a n - Ryazan~an 58 ~ 57 ~ Fxc. 1. Comparison of scale and tectonic elements in different basins: (a) Upper Jurassic of the North Sea including Helmsdale, the Moray Firth and the Brae fields (Ziegler 1975); (b) Upper Jurassic of E Greenland (from Surlyk 1978) (note the relationship to the modern fjordic coast); (c) an enlarged view of the Claymore field (from Turner et al. 1984) (cf(a)) for scale comparison with Knight Inlet, British Columbia, highlighted in Fig.

T b (km) 5 POSTuSL/BE ~LP BLOCKS #3 & #8 HAVE SEDIMENT GRAVITY FLOW . LONGEST LATERAL INFILL IN PULL APARTS f1 "-~---J TRANSLATION. OTHERS ~ / - - ' < ~ " #1 HAVING VARYING AMOUNTS . . . ~**~'~ FAULT 9 .............. ~ . ~-~-:: J'~t----~:---~--~--~:":'~d";IL- - - #4....... , ~' " I N T E R P R E T A T I O N OF H U N T E C / SLIDE BLOCK CONTORTED BEDS / CLARK FIORD , " " 20 ~ 30 | . q. ~ - - HUNTEC . e. = 20x (km) FIG. 10. 66 L air-gun and high resolution HUNTEC | DTS reflection seismic records.

Ultimately these deposits will fail, usually transforming into a debris flow (cf Prior & Bornhold 1986). In an elongate fjord-like basin, therefore, it is probable that basin-plain sand and conglomeratic deposits do not have a common origin. The former may be far travelled by high density turbidity currents or by cohesionless debris flows following the axis of the basin; the latter may be short travelled by cohesive debris flows from the basin margins, although such debris flows can readily change direction and flow along the basin axis (Figs 11 and 12; cfShelton 1966).

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