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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Altiplano (4)
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ODP Site 1256 (1)
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Equatorial Pacific (5)
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Primary terms
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Australasia
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Quaternary
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Tertiary
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lower Tertiary (1)
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Pliocene (7)
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Oligocene
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upper Cenozoic (2)
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Integrated Ocean Drilling Program
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Invertebrata
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Nd-144/Nd-143 (8)
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Mesozoic
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strontium
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lead
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Pb-208/Pb-204 (4)
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Bauer Deep (2)
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Chile Ridge (2)
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Equatorial Pacific (5)
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Northeast Pacific
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Gulf of Panama (1)
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Hess Deep (1)
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Northwest Pacific
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Japan Trench (1)
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Kashima Seamount (1)
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South Pacific
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Southeast Pacific
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Bauer Deep (2)
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Chile Ridge (2)
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Nazca Ridge (4)
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West Pacific
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Northwest Pacific
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Erimo Seamount (1)
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Japan Trench (1)
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Kuril Trench (1)
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Pacific region (4)
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Nazca Plate
Origin of the Sierras Pampeanas, Argentina: Flat-slab subduction and inherited structures
Across-strike asymmetry of the Andes orogen linked to the age and geometry of the Nazca plate
The role of flat slab subduction, ridge subduction, and tectonic inheritance in Andean deformation
Impact of bending-related faulting and oceanic-plate topography on slab hydration and intermediate-depth seismicity
Cooling of the continental plate during flat-slab subduction
Ground-motion model for subduction earthquakes in northern South America
The role of slab geometry in the exhumation of cordilleran-type orogens and their forelands: Insights from northern Patagonia
Ground‐Motion Evaluation of Moderate and Large Interface Earthquakes along the Chilean Subduction Zone
Lithospheric Structure of the Central Andes Forearc from Gravity Data Modeling: Implication for Plate Coupling
Subduction of an extinct rift and its role in the formation of submarine landslides in NW South America
Abstract On the eastern margin of the Panama Basin, the Nazca oceanic plate converges towards the continental plate of South America at approximately 53 mm a −1 . Subduction processes are accompanied by the presence of anomalous bathymetric elements including the Sandra Ridge. This east–west-orientated ridge is catalogued as an aborted rift derived from a magmatic spreading axis that was active between 12 and 9 Ma. Seismic activity within this structure is considered evidence of fault reactivation and tectonism. Once the structure reached the subduction trench several submarine landslides were triggered. Run-out lengths of these submarine landslides are perpendicular to the convergence of the structure with some units spreading and forming a wide fan that reaches tens of kilometres to the north and south of the trench. The area affected by the three main landslides varies between 130 and 300 km 2 approximately, with relatively superficial earthquakes (<33 km) and with magnitudes that reach up to M w 7.2. The morphology of the landslides suggests a retrogressive nature with younger events proximal to shore. This paper presents estimates of the age of these landslides and discusses sources of uncertainty regarding these times of occurrence.
Post-seismic response of the outer accretionary prism after the 2010 Maule earthquake, Chile
The Crustal Seismicity of the Western Andean Thrust (Central Chile, 33°–34° S): Implications for Regional Tectonics and Seismic Hazard in the Santiago Area
Geology of the Josemaría Porphyry Copper-Gold Deposit, Argentina: Formation, Exhumation, and Burial in Two Million Years
Role of subducted sediments in plate interface dynamics as constrained by Andean forearc (paleo)topography
ABSTRACT Forearc topography and inferred paleotopography are key constraints on the processes acting at plate interfaces along subduction margins. We used along-strike variations in modern topography, trench sediment thickness, and instrumental seismic data sets over >2000 km of the Chilean margin to test previously proposed feedbacks among subducted sediments, plate interface rheology, megathrust seismicity, and forearc elevation. Observed correlations are consistent with subducted sediments playing a prominent role in controlling plate interface rheology, which, in turn, controls the downdip distribution of megath-rust seismicity and long-term forearc elevation. High (low) rates of trench sedimentation promote long-term interseismic coupled offshore forearc uplift (subsidence) and onshore forearc platform subsidence (uplift). Low trench sedimentation rates also promote deeper megathrust seismic slip, enhancing short-wavelength coastal zone uplift. Shallowing of subducting slabs contributes to a reduction in coastal zone–onshore forearc relief, in turn preventing formation of onshore forearc basins. The extremely low denudation rates of hyperarid northern Chile have allowed better reconstructions of the histories of paleoel-evations and paleoclimate compared to other sections of the forearc. Even if these histories are not sufficiently resolved to unequivocally assign causality among climate variability, changes in plate interface frictional properties, and forearc elevation, they are consistent with the onset of hyperaridity in the coastal zone at 25–20 Ma (1) triggering long-term, long-wavelength offshore forearc subsidence and onshore forearc uplift, and (2) accelerating short-wavelength coastal zone uplift.
A trapdoor mechanism for slab tearing and melt generation in the northern Andes
Seismic, Volcanic, and Geodetic Networks in Ecuador: Building Capacity for Monitoring and Research
The Seismic Network of Chile
Space Geodesy Infrastructure in Colombia for Geodynamics Research
The History, State, and Future of the Argentine Continuous Satellite Monitoring Network and Its Contributions to Geodesy in Latin America
ABSTRACT This study is focused on the Salaverry Basin, in the forearc of the Peruvian Andes, which contains three oil seeps sampled and analyzed, suggesting at least one active petroleum system within the basin. The development of the basin is controlled by the interaction between the Nazca-Farallon and South American plates, together with Nazca ridge subduction. Seismic stratigraphic analysis calibrated with available well and core data was carried out to understand the spatial-temporal evolution of Cenozoic depositional systems in the basin. As a result, the Cenozoic succession is best subdivided into five second-order sequences (2S1–2S5) composed of nine third-order sequences (3S1–3S9). Subsequently, 3-D seismic geomorphologic analysis afforded images of depositional elements from mapped seismic sequences. Further analysis of these images enhanced interpretation of depositional systems and lithological predictions. Hence, this study adds new potential reservoir rocks into the 2S1, 2S2, 3S2, 3S3, 3S5, and 3S6 sequences and seal rocks into the 3S1, 3S4, 3S5, and 3S7–3S9 sequences, for the petroleum systems previously defined in the basin. These new petroleum system elements are related to the potential plays proposed in this study, which in turn, through a follow-up assessment, could become very attractive exploratory prospects located in the central portion of the Salaverry Basin, shallow water offshore Peru (west South America).