Preliminary geologic map of the Dillon 1? x 2? Quadrangle, Montana

Ruppel, E.T.; O'Neill, J. M.; Lopez, David A.

doi:10.3133/ofr83168

Cited by 8 publications

(7 citation statements)

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“…In the paragraphs following, I argue that the granitic rocks could indeed provide useful clues. In granulite-grade source rocks, K occurs mainly in feldspar Ruppel et al (1983), Snee (1982), and my own data.…”

Section: Estimating Thermal Productivity Of Source Rocksmentioning

confidence: 99%

Using granite to image the thermal state of the source terrane

Zen

1992

Geological Society of America Special Papers

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It should be possible to infer the thermal state of the source terrane for granitic bodies, provided we have independent means to establish the chemical nature of this terrane. The chemical nature of the granitic rocks, including their degree of hydration, implies the solidus temperature. The concentration of the heat-producing radioactive elements in the granite (K, U, and Th) probably provides an upper estimate of their concentration in the source rock, which is an important thermal parameter. The depth and ambient temperature of the country rock into which the granite magma intruded provide useful boundary conditions for the thermal regime at the crustal level of anatexis. These constraints in turn form the bases for estimating the subcrustal thermal flux as well as the effective thermal interface for enhanced heat flow from below that resulted in anatexis. These inferences, in combination with other field-based parameters such as uplift rates and permissible time lapses for the geological events, permit realistic thermal modelling for the formation of granitic batholiths. The procedure is applied to the Late Cretaceous Pioneer and Boulder batholiths in southwestern Montana, U.S.A. The modelling results suggest that mantle upwelling, not subduction or thrust loading, caused anatexis. The isotopic chemistry of the granitic rocks rules out direct mixing of mantle magma, and field relations rule out crustal thinning as causes for partial melting.

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Section: Estimating Thermal Productivity Of Source Rocksmentioning

confidence: 99%

Using granite to image the thermal state of the source terrane

Zen

1992

Geological Society of America Special Papers

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“…This area lies within the Northern Rocky Mountain and Montana Valley and Foothill Prairies Ecoregions (Woods et al 1999) and is characterized by broad intermontane valleys interspersed with isolated mountain ranges. The geology is a complex mixture of predominately Tertiary and Cretaceous sedimentary rocks with localized intrusions of Tertiary volcanics, Mississippian limestone, Proterozoic quartzite, and Archaean gneiss and schist; Pleistocene glacial deposits are locally abundant at higher elevations (Ruppel et al 1993, Ruppel 1999, Lonn et al 2000, Skipp and Janecke 2004. The climate is semiarid and continental.…”

Section: Study Areamentioning

confidence: 99%

A vegetation index of biotic integrity for small-order streams in southwest Montana and a floristic quality assessment for western Montana wetlands

Jones¹

2005

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“…To the east are the metasedimentary and metamorphic Precambrian Belt Group rocks of the Sapphire Mountains. The Bitterroot Valley is a downfaulted block (graben) that is now filled by well sorted fluvial and colluvial sediments from the surrounding mountains (Rupel et al, 1983).…”

Section: Western Montanamentioning

confidence: 99%

NWSRFS CALIBRATION PARAMETER SELECTION AND GEOLOGIC REASONING: PACIFIC NORTHWEST CASES¹

Martin

2002

J American Water Resour Assoc

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The National Weather Service River Forecast System (NWSRFS) is the new hydrologic prediction model for the National Weather Service (NWS) and provides guidance to meteorologists who issue NWS Flood Warnings to the public. The primary submodel within NWSRFS is the Sacramento Soil Moisture Accounting (SAC‐SMA) model, which predicts surface runoff as a function of meteorological, geological, and soil data calibrated over a watershed. The research presented here focuses on a different approach to NWSRFS calibrations: greater utilization of geologic and soil data, in order to give the model better predictive capability. Geologic understanding can create better insights for the initial estimation and subsequent adjustment of SAC‐SMA parameters. Fifteen calibrated Pacific Northwest drainages reveal a variety of hydrogeologic responses. For example, results for the Mount Rainier drainages show the complex interaction between active glaciers, impermeable volcanic surfaces, and glacial sedimentary valleys. Unweathered volcanic terrains show flashy peak flows, fast flow recessions, and low baseflow. Sedimentary terrains display subdued peak flows, slow flow recessions, and higher baseflow. Operational implementation of these calibrations at the NWS's Northwest River Forecast Center has yielded more accurate predictive results since 1995. NWS hydrologic forecasters nationwide could benefit from using drainage basin geologic characteristics in understanding and improving model calibrations and real time forecasts.

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Preliminary geologic map of the Dillon 1? x 2? Quadrangle, Montana

Cited by 8 publications

References 0 publications

Using granite to image the thermal state of the source terrane

Using granite to image the thermal state of the source terrane

A vegetation index of biotic integrity for small-order streams in southwest Montana and a floristic quality assessment for western Montana wetlands

NWSRFS CALIBRATION PARAMETER SELECTION AND GEOLOGIC REASONING: PACIFIC NORTHWEST CASES¹

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Preliminary geologic map of the Dillon 1? x 2? Quadrangle, Montana

Cited by 8 publications

References 0 publications

Using granite to image the thermal state of the source terrane

Using granite to image the thermal state of the source terrane

A vegetation index of biotic integrity for small-order streams in southwest Montana and a floristic quality assessment for western Montana wetlands

NWSRFS CALIBRATION PARAMETER SELECTION AND GEOLOGIC REASONING: PACIFIC NORTHWEST CASES1

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NWSRFS CALIBRATION PARAMETER SELECTION AND GEOLOGIC REASONING: PACIFIC NORTHWEST CASES¹