The Agost Basin (Betic Cordillera, Alicante province, Spain): a pull-apart basin involving salt tectonics

The Frade field, located within the Campos Basin in the southeastern Brazilian margin, is a key oil field that produces from Oligo-Miocene turbidite reservoirs that derived their structural positioning due to the presence of an underlying salt diapir. The evolution of the Frade salt structure was examined using well data, selected 2D lines, and a 3D volume that were interpreted in detail focusing on the Aptian evaporite interval and its influence on the overburden. Analysis of the salt-sediment interaction indicated a complex deformation history that included five main stages of deformation, some assisted by tectonic reactivation episodes. (1) Post-Albian reactivation of a nearby north–northwest-south–southeast basement fault caused the Albian carbonate interval to fault, forming a west–northwest-east–southeast shear zone with a dextral strike-slip component. This movement initiated thin-skinned tectonics that offset the Albian carbonates and formed a pull-apart basin that accommodated a thick Late Cretaceous interval, which weakened the overburden and allowed for the initial formation of the Frade salt diapir. (2) Renewed diapir growth thickened and redistributed the Cenomanian-Maastrichtian sedimentary package proximal to the Frade salt anticline. (3) An initial and localized collapse of the Frade salt anticline occurred during early Paleogene extension. (4) Paleogene shortening caused the salt to flow, resulting in salt withdrawal in the southeast and diapir rejuvenation near its present-day apex, forming several inversion structures. In addition, the Paleogene shortening resulted in a low-relief anticlinal structure that rotated the turbidites into geometries favoring hydrocarbon accumulation. (5) A return to an extensional regime occurred during the late Oligocene/early Miocene. The results of this study provide a new insight into the development of strike-slip salt tectonic structures and show for the first time within the Campos Basin an Albian-level pull-apart basin that formed in association with salt tectonics.

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A prospective Early Late Paleocene event (ELPE) from the expanded Río Gor hemipelagic section (Betic Cordillera, southern Spain): foraminifera, nannofossil and isotopic data

Rendiconti online della Società Geologica Italiana ◽

10.3301/rol.2014.110 ◽

2014 ◽

Vol 31 ◽

pp. 181-182

Author(s):

Victoriano Pujalte

Keyword(s):

Betic Cordillera ◽

Southern Spain ◽

Isotopic Data ◽

Late Paleocene ◽

Early Late

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Tracking dinosaurs in BLM canyon country, Utah

Geology of the Intermountain West ◽

10.31711/giw.v3i0.8 ◽

2018 ◽

Vol 3 ◽

pp. 67-100 ◽

Cited By ~ 3

Author(s):

ReBecca K. Hunt-Foster ◽

Martin G. Lockley ◽

Andrew R.C. Milner ◽

John R. Foster ◽

Neffra A. Matthews ◽

...

Keyword(s):

Colorado Plateau ◽

Foreland Basin ◽

Salt Tectonics ◽

Initial Development ◽

Paradox Basin ◽

Cedar Mountain Formation ◽

History Of ◽

San Rafael ◽

San Rafael Swell ◽

Biological History

Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.

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Tracking dinosaurs in BLM canyon country, Utah

Geology of the Intermountain West ◽

10.31711/giw.v3.pp67-100 ◽

2016 ◽

Vol 3 ◽

pp. 67-100

Author(s):

ReBecca Hunt-Foster ◽

Martin Lockley ◽

Andrew Milner ◽

John Foster ◽

Neffra Matthews ◽

...

Keyword(s):

Colorado Plateau ◽

Foreland Basin ◽

Salt Tectonics ◽

Initial Development ◽

Paradox Basin ◽

Cedar Mountain Formation ◽

History Of ◽

San Rafael ◽

San Rafael Swell ◽

Biological History

Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.

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The Lower Cretaceous in east-central Utah—The Cedar Mountain Formation and its bounding strata

Geology of the Intermountain West ◽

10.31711/giw.v3.pp101-228 ◽

2016 ◽

Vol 3 ◽

pp. 101-228 ◽

Cited By ~ 4

Author(s):

James Kirkland ◽

Marina Suarez ◽

Celina Suarez ◽

ReBecca Hunt-Foster

Keyword(s):

Colorado Plateau ◽

Foreland Basin ◽

Salt Tectonics ◽

Initial Development ◽

Paradox Basin ◽

Cedar Mountain Formation ◽

History Of ◽

San Rafael ◽

San Rafael Swell ◽

Biological History

Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.

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