Science and Technology Production
Book Chapter
Authorship
Date
2005
Publishing House and Editing Place
Geological Society, London, Special Publications
Book
The Neuquén Basin, Argentina: a case study in Sequence Stratigraphy and Basin Dynamics
(pp. 109-138)
Geological Society, London, Special Publications
Geological Society, London, Special Publications
ISBN
1-86239-190-4
Summary
Information provided by the agent in
SIGEVA
The Valanginian Mulichinco Formation was accumulated in the Neuquén Basin (west-central Argentina), during and immediately after a major relative sea–level fall, partially triggered by a tectonic inversion pulse. The Formation represents a lowstand wedge where excellent outcrops together with refined biostratigraphic coverage have permitted the detailed examination of contemporaneous non-marine and marine deposits. Fourteen facies associations were identified in the Mulichinco Form...
The Valanginian Mulichinco Formation was accumulated in the Neuquén Basin (west-central Argentina), during and immediately after a major relative sea–level fall, partially triggered by a tectonic inversion pulse. The Formation represents a lowstand wedge where excellent outcrops together with refined biostratigraphic coverage have permitted the detailed examination of contemporaneous non-marine and marine deposits. Fourteen facies associations were identified in the Mulichinco Formation. They represent accumulation ranging from gravelly fluvial braidplains to outer-shelf marine settings. Distribution of depositional environments, together with the identification of key surfaces and stratal patterns, has resulted in the identification of early and late lowstand, transgressive, and highstand system tracts. Accordingly, the Mulichinco lowstand wedge comprises one third-order sequence that lasts about 2 m.y. and represents a lowstand sequence set. Shoreline sedimentation was remarkably different in certain areas of the Mulichinco depositional area and alluvial deposits were not developed within incised valleys. Tectonically-derived topography, basin physiography, and fault-controlled subsidence are interpreted to have been the main controls on the evolution of the Mulichinco lowstand wedge. The results of this study have important implications for both understanding the history of Neuquén Basin and illustrating the previously undocumented architectural complexity that may exist within lowstand wedges.
Show more
Show less
Key Words
LOWSTAND WEDGESEDIMENTARY EVOLUTION AND ANATOMYFORMACION MULICHINCONEUQUÉN BASIN