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Showing 1 to 17 of 17 for “"Rio Grande Rift"”.
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Gravity constraints on extension and magmatism in the northernmost Rio Grande rift, northern Colorado
The Rio Grande Rift (RGR) is a north-trending belt of extensional basins extending from southern New Mexico to central Colorado, where its physiographic expression ends. Opening of the RGR initiated in the late Oligocene forming a series of rift basins linked by accommodation zones where the amount …
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STRUCTURAL EVOLUTION OF THE RIO GRANDE RIFT: SYNCHRONOUS EXHUMATION OF RIFT FLANKS FROM 20-10 MA, EMBRYONIC CORE COMPLEXES, AND FLUID-ENHANCED QUATERNARY EXTENSION
The Rio Grande rift in Colorado and New Mexico is one of the well-exposed and well-studied continental rifts in the world. Interest in the rift is driven not only by pure scientific intrigue, but also by a desire and a necessity to quantify earthquake hazards in New Mexico as well as to assess …
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Paleomagnetic and AMS results from Oligocene ash-flow tuffs of the eastern San Juan Mountains : implications for the evolution of the western margin of the San Luis Basin, northern Rio Grande Rift
The San Luis Basin (SLB) of the northern Rio Grande rift (RGR) is a spectacular intermontane basin in south-central Colorado. The SLB is an east-dipping, half graben basin that formed in response to extension beginning ca. 26 Ma in the Cordillera. Oligocene ash-flow tuffs exposed in the eastern San …
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Seismic tomographic imaging reveals possible lithospheric erosion beneath Trans-Pecos Texas and Southeastern New Mexico.
… a fast seismic velocity anomaly beneath the Rio Grande rift, attributed to a lithospheric "drip" into the mantle, perhaps due to edge-driven convection. To investigate this anomaly, the Seismic Investigation of Edge-Driven Convection Associated with the Rio Grande Rift (SIEDCAR) project …
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Geochemical characteristics and microbial diversity of CO2-rich mound springs of the Tierra Amarilla anticline, New Mexico
… boundary zone between the Colorado Plateau and Rio Grande rift, on the southern extension of the Nacimiento fault at the Tierra Amarilla anticline (TA). Geochemical data on the spring waters show 3He/4He ratio of 0.17-0.20 RA which indicates the presence of mantle-derived helium in the …
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New structural interpretation, microstructural analyses, and preliminary monazite geochronology of Proterozoic rocks in the central Manzano Mountains, New Mexico
… of central New Mexico, on the east flank of the Rio Grande Rift, provide excellent outcrops of Proterozoic basement. Rock types in the area include Sevilleta metarhyolite, amphibolitic metavolcanic rocks, schist, meta-lithic arenite, banded metarhyolite, the White Ridge and related quartzites, …
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Geologic and tectonic evolution of the Manzano Peak Quadrangle, central New Mexico
… the east flank of the Albuquerque Basin of the Rio Grande Rift. During the Paleoproterozoic, the Precambrian rocks exposed in the range were accreted onto the "southward" growing Laurentian craton (southward by current day coordinates). Regional plutonism occurred during accretion (ca. 1.65 Ga) …
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History and timing of polyphase Proterozoic deformation in the Manzano thrust belt, central New Mexico
… Pinos Mountains, on the eastern flank of the Rio Grande Rift, provide spectacular exposures of the Proterozoic Manzano thrust belt. This region is an important place to better characterize polyphase deformation and magmatism related to the assembly of Laurentia, particular the 1.65-1.60 Ga …
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An aqueous geochemical and hydrologic study of the springs and wells of the Sevilleta National Wildlife Refuge : evaluating hydrochemical pathways
The Rio Grande is a regionally important water source, but the smaller rift springs are also a vital resource for livestock and wildlife. Several springs are located on rift-bounding faults and exhibit a mixing of larger volume meteoric recharge with small volume, chemically potent "endogenic" …
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Soil geomorphology of the eastern Sevilleta Long Term Ecological Research Site
… processes and landscape evolution in the central Rio Grande Rift. These soils were found to contain key information regarding pedologic and geomorphic responses to climate change, rifting and base level drop. A rare association of sepiolite and palygorskite occurs in old soils formed in eolian …
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Characterization of a volcanically impacted, overfilled continental rift basin within the southeastern Jemez Mountains, New Mexico
Volcanically impacted continental rift basins that experience coeval subsidence and volcanism challenge the conventional sedimentation models for continental rift basins. A field study was undertaken at the eastern margin of Bearhead basin within the southeastern Jemez volcanic field of north …
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THE STRATIGRAPHIC POSITION OF FOSSIL VERTEBRATES FROM THE POJOAQUE MEMBER OF THE TESUQUE FORMATION (MIDDLE MIOCENE, LATE BARSTOVIAN) NEAR ESPAÑOLA, NEW MEXICO
… environment within the Española Basin while the Rio Grande Rift was active. Cavazza (1986) identified two paleodrainage systems (lithosome A, basin-margin facies and B, basin-floor facies) by means of sandstone and conglomerate petrology, paleocurrent, and sedimentary facies analyses. After x-ray …
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GEOCHRONOLOGY, GEOCHEMISTRY, AND TECTONIC CHARACTERIZATION OF QUATERNARY LARGE-VOLUME TRAVERTINE DEPOSITS IN THE SOUTHWESTERN UNITED STATES AND THEIR IMPLICATIONS FOR CO2 SEQUESTRATION
… the southeastern Colorado Plateau and along the Rio Grande rift. They accumulated above fault systems during episodes of high hydraulic head in confined aquifers, increased regional volcanic activity, and high input of mantle-derived volatiles such as CO2 and He. Stable isotope and trace element …
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Investigation of the upper mantle as a source for contribution to magnetic anomalies
… discussion on the results. Chapter 3 “Craton vs. rift uppermost mantle contributions to magnetic anomalies in the United States interior” (2014) published in Tectonophysics by Friedman, Feinberg, Ferré, Demory, Martín-Hernández, Conder, and Rochette begins to compare magnetic properties across …
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Structural Analysis of the Northwest Wind Mountain Quadrangle, New Mexico: Proterozoic Shearing to Cenozoic Brittle Faulting in the Burro Mountains
… to the formation of the Basin and Range and the Rio Grande Rift starting at ~37 Ma.</p> <p> Evidence for northeast (031<sup>o</sup>; N31<sup>o</sup>E) shearing during accretion of the Mazatzal Province is recorded by southwest plunging (211<sup>o</sup>; S31<sup>o</sup>W) lineations with …
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Fluvial sedimentation in continental half-graben basins
… stratigraphic architecture of intracontinental rift basins is defined by a dynamic relationship between depositional belts associated with the basin floor and flanking tributary streams on the piedmont. Spatiotemporal distributions of these deposits are sensitive to basin geometry, subsidence …
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EPISODIC UPLIFT OF THE ROCKY MOUNTAINS: EVIDENCE FROM U-PB DETRITAL ZIRCON GEOCHRONOLOGY AND LOW-TEMPERATURE THERMOCHRONOLOGY WITH A CHAPTER ON USING MOBILE TECHNOLOGY FOR GEOSCIENCE EDUCATION
… to local faulting and/or uplift associated with Rio Grande rifting. Post-10 Ma cooling in areas not associated with the Rio Grande rift is compatible with models that incorporate regional integration of the Colorado River and Rio Grande to cause differential incision and localized rapid cooling. …