Environmental Engineering Reference
In-Depth Information
FIGURE 6
Model of sequential colonization in turbidite/hemipelagite couplets according to
Wetzel and Uchman (2001)
.T
b
,T
c
,T
d
,T
e
indicate the Bouma intervals (see text).
Modified after
Uchman (2007a)
.
the sediment is colonized by small opportunistic deposit feeders producing
Phycosiphon
, rather than by the larger sediment-feeding producers of
Nereites
(
Fig. 6
). Both burrows penetrate the sediment horizontally and have no connec-
tion to the sea floor, benefiting from the still oxygenated pore water. When
oxygen and food decreases to a level that horizontal mining becomes ineffi-
cient, the sediment is colonized by stationary burrowers producing
Chondrites
;
(
Pa
), and
Thalassinoides
(
Th
). (B) Totally bioturbated turbidites in a Neogene slope basin, Eastern
Cape; Northern Island, New Zealand.
Scolicia
(
Sc
) cross-cut by
Chondrites
(
Ch
). (C) Totally
bioturbated turbidites in a Neogene slope basin, Eastern Cape; Northern Island, New Zealand.
Chondrites
(
Ch
),
Planolites
(
Pl
),
Phycosiphon
(
Ph
),
Taenidium
(
Ta
), and
Thalassinoides
(
Th
).
Note light turbidite-derived material as infilling of burrows below the base of the turbidite (exichnial
elite layer).
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