Nancy R. Riggs
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View article: Oligocene–Miocene development and evolution of the south Dome Rock Mountains basin, lower Colorado River corridor, Arizona, USA
Oligocene–Miocene development and evolution of the south Dome Rock Mountains basin, lower Colorado River corridor, Arizona, USA Open
Sedimentary basins in the Colorado River extensional corridor record large-magnitude Basin and Range extension and younger dextral shear deformation in the evolving Pacific–North America plate boundary. The south Dome Rock Mountains basin …
View article: Tectonic setting of Lower to Middle Triassic strata in the Mojave and Sonoran Deserts, southwestern North America
Tectonic setting of Lower to Middle Triassic strata in the Mojave and Sonoran Deserts, southwestern North America Open
Lower to Middle Triassic strata of the Moenkopi Formation and correlative metasedimentary lower Buckskin Formation record a complex tectonic setting in southwestern Laurentia. These strata are thought to have been deposited in a foreland b…
View article: Supplemental Material: Sedimentary provenance of Silurian basins in western Ireland during Iapetus closure
Supplemental Material: Sedimentary provenance of Silurian basins in western Ireland during Iapetus closure Open
Figure S1: Histograms of detrital zircon ages
View article: Supplemental Material: Sedimentary provenance of Silurian basins in western Ireland during Iapetus closure
Supplemental Material: Sedimentary provenance of Silurian basins in western Ireland during Iapetus closure Open
Figure S1: Histograms of detrital zircon ages
View article: A Lower Devonian age for the Corvock Granite and its significance for the structural history of South Mayo and the Laurentian margin of western Ireland
A Lower Devonian age for the Corvock Granite and its significance for the structural history of South Mayo and the Laurentian margin of western Ireland Open
The Silurian Croagh Patrick succession, which crops out just south of a fundamental Caledonian structural zone near Clew Bay, western Ireland, is a series of psammites and pelites with a strong penetrative cleavage. These rocks are intrude…
View article: The Permian Monos Formation: Stratigraphic and detrital zircon evidence for Permian Cordilleran arc development along the southwestern margin of Laurentia (northwestern Sonora, Mexico)
The Permian Monos Formation: Stratigraphic and detrital zircon evidence for Permian Cordilleran arc development along the southwestern margin of Laurentia (northwestern Sonora, Mexico) Open
The southwestern margin of Laurentia transitioned from a left-lateral transform margin to a convergent margin by middle Permian time, which initiated the development of a subduction zone and subsequent Cordilleran arc along western Laurent…
View article: Cordilleran Subduction Initiation: Retroarc Timing and Basinal Response in the Inyo Mountains, Eastern California
Cordilleran Subduction Initiation: Retroarc Timing and Basinal Response in the Inyo Mountains, Eastern California Open
Subduction zones drive plate tectonics on Earth, yet subduction initiation and the related upper plate depositional and structural kinematics remain poorly understood because upper plate records are rare and often strongly overprinted by m…
View article: Evolution of the early Mesozoic Cordilleran arc: The detrital zircon record of back-arc basin deposits, Triassic Buckskin Formation, western Arizona and southeastern California, USA
Evolution of the early Mesozoic Cordilleran arc: The detrital zircon record of back-arc basin deposits, Triassic Buckskin Formation, western Arizona and southeastern California, USA Open
A shift in the depositional systems and tectonic regime along the western margin of Laurentia marked the end of the Paleozoic Era. The record of this transition and the inception and tectonic development of the Permo-Triassic Cordilleran m…
Provenance of Pennsylvanian–Permian sedimentary rocks associated with the Ancestral Rocky Mountains orogeny in southwestern Laurentia: Implications for continental-scale Laurentian sediment transport systems Open
The Ancestral Rocky Mountains system consists of a series of basement-cored uplifts and associated sedimentary basins that formed in southwestern Laurentia during Early Pennsylvanian–middle Permian time. This system was originally recogniz…
View article: Insight into late-Iapetus tectonics from new U–Pb zircon and micropalaeontological data from the Navan area, eastern Ireland
Insight into late-Iapetus tectonics from new U–Pb zircon and micropalaeontological data from the Navan area, eastern Ireland Open
Navan zircon U–Pb geochronology and geochemistry data.
View article: Marine Volcaniclastic Record of Early Arc Evolution in the Eastern Ritter Range Pendant, Central Sierra Nevada, California
Marine Volcaniclastic Record of Early Arc Evolution in the Eastern Ritter Range Pendant, Central Sierra Nevada, California Open
Marine volcaniclastic rocks in the Sierra Nevada preserve a critical record of silicic magmatism in the early Sierra Nevada volcanic arc, and this magmatic record provides precise minimum age constraints on subduction inception and tectoni…
View article: EARLY MESOZOIC VOLCANICLASTIC ROCKS OF AGNEW MEADOWS, EAST-CENTRAL SIERRA NEVADA, CALIFORNIA
EARLY MESOZOIC VOLCANICLASTIC ROCKS OF AGNEW MEADOWS, EAST-CENTRAL SIERRA NEVADA, CALIFORNIA Open
Above: An outcrop of tuff breccia (tb1) in Agnew Meadows (20 x 25 cm composition notebook for scale) with nearly vertical planar fabric and obloid-shaped clasts, and outcrop of tuff (t1) in Agnew Meadows with the tuff breccia in the backgr…
View article: Sources of volcanic detritus in the basal Chinle Formation, southwestern Laurentia, and implications for the Early Mesozoic magmatic arc
Sources of volcanic detritus in the basal Chinle Formation, southwestern Laurentia, and implications for the Early Mesozoic magmatic arc Open
The Upper Triassic Chinle Formation in southwestern Laurentia is the oldest distinctive record of Early Mesozoic Cordilleran arc magmatism, in the form of detrital zircons and volcanic clasts. Initial deposition of the basal Shinarump and …
View article: Laurentian origin of the Ordovician Grangegeeth volcanic arc terrane, Ireland
Laurentian origin of the Ordovician Grangegeeth volcanic arc terrane, Ireland Open
U–Pb ages determined by laser-ablation multi-collector inductively coupled plasma mass spectrometry on 199 zircons from a lithic pumice tuff are the first isotopic ages from the Grangegeeth volcanic terrane of Ireland. The youngest zircon …
View article: Detrital zircon provenance and Ordovician terrane amalgamation, western Ireland
Detrital zircon provenance and Ordovician terrane amalgamation, western Ireland Open
Detrital zircon analysis of sandstones interbedded with c. 464 Ma ignimbrites in the lower Mweelrea Formation of the South Mayo Trough, western Ireland, suggests Ordovician source-rock provenance that corresponds to two distinct volcanic-a…
View article: Quickening the pulse: Fractal tempos in continental arc magmatism
Quickening the pulse: Fractal tempos in continental arc magmatism Open
The magmatic history of a continental arc can be characterized as punctuated equilibrium, whereby long periods of low-level activity are interrupted periodically by short bursts of high-volume magmatism (“flare-ups”). Geochronological reco…