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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Structural Geology
of the Mississippi Fan Fold Belt, Northern Deep Gulf of Mexico, Part 2:
Growth History and Evolution
Morris, Peter L.1,2 and
Weimer, Paul1
ABSTRACT
A series of palinspastic seafloor maps were created to provide
a qualitative estimation of the temporal and spatial growth history of the
Mississippi Fan fold belt in the Atwater Valley pro-traction area. These
qualitative maps are based on isochron maps of growth intervals, onlap lines
of growth sediments, truncation lines of different strata, and structural
restorations. Maps were generated for four discrete growth intervals: 9.0,
7.45, 6.2, and 5.4 Ma.
The 13.0 to 9.0 Ma interval is interpreted to
be the pre-growth in the study area. At 9.0 Ma, cross section restorations
and isochron maps indicate that folding initiated at the eastern portion
of the fold belt. In the central and western part of the fold belt, folding
had initiated. However, the restorations indicate that no faulting had developed.
At 7.45 Ma, the Mississippi Fan fold belt continued
to grow and displays signs of linkage of individual folds, particularly in
the eastern Mississippi Fan fold belt. At 6.2 Ma, extensive folding and faulting
have occurred. Isochron maps suggest extensive linkage and fold growth. The
5.4 Ma palinspastic map reflects the descriptions above of fault and fold
timing. However, by 5.4 Ma the majority of deformation associated with the
Mississippi Fan fold belt has taken place. There is minor folding after this
time interval as well as minor fault linkage.
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