Page 246 - Carbonate Platforms Facies, Sequences, and Evolution

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slope,
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the
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DEPOSITI ON AL
lower
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B.
BEDS
member
DE
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NEUC HATEL
up. member
UPPER OR BITO-
" LUMACHELLE "
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platform,
in
HA1
AP 2
4-�-+.�------�--�
a
facies and coral reefs (initiation facies).
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SEQUENCES
part
of
----
of the Urgonian platform ('haut-fond precurseur').
at the top, by the deposition of oolites, coral debris
the Hauterivian, did in fact enable the inner part of
The rapid sediment accumulation on the hemipelagic
From a morphological point of view, the lowstand
shoal which prepared the way for the development
Vocontian basin that remained deep until the end of
wedge of the early Barremian can be considered as a
characterized at the base by transgressive facies and,
Fig. 26. Comparison between the eustatic curves of Haq et
the
r:;......
RISE
����
RE LATIVE
lower Orbitolina beds; BBL, Borne bioclastic limestone formation.
than
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.t.:
SE A
exposure.
inner shelf
30 km
acceleration
VA RIATIONS
Emersion of
to
of
----+---
The Jura and northern Subalpine chains
domain
the
DROP
LEVEL
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:...::--=-=-:
SF
LW
HW
HW
TST
TST
HW
TST
TST
TST
TST
subsidence
southeast
of
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after
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[
I
I
::::::::::::::::: \
\
the
I
�(((( I _. _
(H aq et
the
__
EUSTAT IC
a!.
former
(Berriasian to Hauterivian platforms) (Fig. 3).
__
Subalpine domains. Dotted interval corresponds to a large difference between curves. Abbreviations: see Fig. 8. LOB,
��
__
a!. (1987) and the relative sea-level variations in the Jura and
edge
a relatively short span of time. The particularly high
the Urgonian platform to extend very rapidly more
sedimentation rates are thus a reflection of both the
limestone is a transgressive formation deposited over
Barremian
substantial rise in sea-level at this time and a likely
(along the Isere fault) of the Neocomian platform
It should be emphasized finally that the Urgonian
231
, 1987)
CURVES
_