Faults of the central part of the Lewis and Clark line and fragmentation of the Late Cretaceous foreland basin in west-central Montana

Wallace, C.A.; Lidke, David J.; Schmidt, Rüdiger

doi:10.1130/0016-7606(1990)102<1021:fotcpo>2.3.co;2

Cited by 42 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In northwestern Montana, north of the Late Cretaceous (Wallace et al, 1990) Lewis and Clark fault zone (Fig. 4), the Kisenehn-Flathead-Mission-Swan complex of Eocene extensional basins (Constenius, 1996), superimposed on the Alberta-Montana thrust belt (Fig.…”

Section: Mid-cenozoic Tectono-magmatic Relations Pacific Northwest Anmentioning

confidence: 99%

The Basin and Range Province as a Composite Extensional Domain

Dickinson

2002

International Geology Review

227

254

View full text Add to dashboard Cite

The Basin and Range province is a composite Cenozoic taphrogen with a present configuration and internal geometry derived from superimposed multiple phases of extensional deformation driven by varied geodynamic impulses. Different components of the composite taphrogen derive from: (a) post-orogenic Late Paleocene to Middle Miocene slab rollback beneath overthickened crust of the Sevier-Laramide orogen, to induce migratory arc magmatism, tectonic denudation of Cordilleran metamorphic core complexes within associated domains of crustal extension, and belts of backarc rifting including pre-Middle Miocene phases of the Rio Grande rift; (b) Eocene transrotational tectonism that pivoted and displaced crustal elements of the Paleogene forearc in the Pacific Northwest; (c) late Early Miocene and younger crustal extension in the northwestern Basin and Range province (Numic subtraphrogen including segments in the Great Basin, Southeast Oregon Plateau, and Idaho-Montana border regions) as structural accompaniment to northward migration of the Mendocino triple junction; and (d) late Middle Miocene and younger crustal extension in the southeastern Basin and Range province (Piman subtaphrogen including the Gulf of California extensional province, interior Meseta Central province, and post-mid-Miocene Rio Grande rift) succeeding the rapid southward migration of the Rivera triple junction. A transtaphrogen bridge spanning the Mojave block, Eastern Transverse Ranges, and a broad region in southeastern California and southwestern Arizona experienced only limited post-mid-Miocene extensional deformation during evolution of the active Numic and Piman subtaphrogens lying to the northwest and southeast. The compound evolutionary history of the Basin and Range province renders moot any unitary theories for its geodynamic behavior.

show abstract

Section: Mid-cenozoic Tectono-magmatic Relations Pacific Northwest Anmentioning

confidence: 99%

The Basin and Range Province as a Composite Extensional Domain

Dickinson

2002

International Geology Review

227

254

View full text Add to dashboard Cite

show abstract

“…The region is divided into two subregions by the Lewis and Clark line, a northwest-trending, predominantly Cretaceous or early Tertiary system of right-lateral faults (Wallace et al, 1990). North of the Lewis and Clark line, block-faulted ranges have been related, in part, to a continuation of the Rocky Mountain trench of Canada (Powell and Williams, 1989) and are also a northward continuation of basin and range style deformation (Constenius, 1982;Powell and Williams, 1989).…”

Section: Northern Rocky Mountains Regionmentioning

confidence: 99%

Regional characteristics, tilt domains, and extensional history of the later Cenozoic Basin and Range Province, western North America

Stewart¹

1998

Accommodation Zones and Transfer Zones; The Regional Segmentation of the Basin and Range Province

View full text Add to dashboard Cite

The Basin and Range province covers a large region of western North America and contains diverse late Cenozoic extensional structures, including metamorphic core complexes, detachment faults, strike-slip faults, and basin and range fault blocks. The central region of the Basin and Range province, extending from the northern Rocky Mountains in the western United States to Sonora, Mexico, contains local or regional areas characterized by moderate-to large-magnitude extension overprinted by basin and range faults that have produced major elongate mountain horsts or tilted blocks and intervening valleys underlain by grabens, half grabens, or downtilted blocks. In southeast Oregon and most the Mexican part of the Basin and Range province east of the Sierra Madre Occidental, the province is only slightly or moderately extended, and structures consist mainly of basin and range blocks produced by widely spaced high-angle normal faults. Strike-slip faults are most common in the western part of the Basin and Range province in the Walker Lane belt of Nevada and California, the Eastern Mojave shear zone of the Mojave Desert region, and parts of the Gulf of California region.Tilt domains in which the dip of stratified rocks and the tilt of mountains blocks are consistently, or fairly consistently, in one direction are characteristic of the Basin and Range province. These domains are commonly 50-200 km or more across in a direction perpendicular to the strike of stratified rocks and the trend of elongate mountain ranges and as much as 1,000 km across parallel to this direction. Tiltdomain boundaries (accommodation zones) consist of either (1) anticlinal boundaries where the strike of stratified rock and the trend of structural fault blocks is parallel to, and the dips or tilts are away from, the boundary; (2) synclinal boundaries where the strike of stratified rock and the trend of structural fault blocks is parallel to, and the dips or tilts are toward, the boundary; or (3) transverse boundaries at a high angle to the strike of stratified rocks and structural fault blocks. These transverse boundaries (transverse accommodation zones) mark areas across which the strike direction of Tertiary rocks and of mountain ranges remains essentially the same, but the dip or tilt direction reverses. Tilt-domain boundaries (accommodation zones) may correspond to areas of abrupt change in dip directions at individual faults or folds, or may be broad areas of structural change that are several kilometers to 20 km across.

show abstract

“…The Lewis and Clark lineament is a long-lived highly deformed structural element that displays evidence of Basin-and Rangestyle faulting during the Miocene through to the present day and bisects the northern Rocky Mountain Basin and Range province ( Fig. 1; Hyndman et al 1988;Wallace et al 1990;Doughty and Sheriff 1992;Yin et al 1993;Sears and Hendrix 2004). The southern boundary of the lineament is delineated by a change in structural trend from NW-SE to N-S across the central Flint Creek basin (Fig.…”

Section: Flint Creek Basin Basement Geology and Tectonic Historymentioning

confidence: 94%

Sedimentary response to orogenic exhumation in the northern Rocky Mountain Basin and Range province, Flint Creek basin, west-central Montana

et al. 2011

View full text Add to dashboard Cite

Middle Eocene through Upper Miocene sedimentary and volcanic rocks of the Flint Creek basin in western Montana accumulated during a period of significant paleoclimatic change and extension across the northern Rocky Mountain Basin and Range province. Gravity modelling, borehole data, and geologic mapping from the Flint Creek basin indicate that subsidence was focused along an extensionally reactivated Sevier thrust fault, which accommodated up to 800 m of basin fill while relaying stress between the dextral transtensional Lewis and Clark lineament to the north and the Anaconda core complex to the south. Northwesterly paleocurrent indicators, foliated metamorphic lithics, 64 Ma ( 40 Ar/ 39 Ar) muscovite grains, and 76 Ma (U-Pb) zircons in a ca. 27 Ma arkosic sandstone are consistent with Oligocene exhumation and erosion of the Anaconda core complex. The core complex and volcanic and magmatic rocks in its hangingwall created an important drainage divide during the Paleogene shedding detritus to the NNW and ESE. Following a major period of Early Miocene tectonism and erosion, regional drainage networks were reorganized such that paleoflow in the Flint Creek basin flowed east into an internally drained saline lake system. Renewed tectonism during Middle to Late Miocene time reestablished a west-directed drainage that is recorded by fluvial strata within a Late Miocene paleovalley. These tectonic reorganizations and associated drainage divide explain observed discrepancies in provenance studies across the province. Regional correlation of unconformities and lithofacies mapping in the Flint Creek basin suggest that localized tectonism and relative base level fluctuations controlled lithostratigraphic architecture. Résumé : Les roches sédimentaires et volcaniques (Éocène moyen au Miocène supérieur) du bassin de Flint Creek dans l'Ouest du Montana se sont accumulées au cours d'une période de changements paléoclimatiques importants et d'extension significative à travers la province Basin and Range des montagnes Rocheuses septentrionales. La modélisation de la gravité, les données obtenues des trous de forage et la cartographie géologique du bassin Flint Creek, indiquent que la subsidence était surtout concentrée le long de la faille de chevauchement Sevier, fortement réactivée; cette subsidence a permis une accumulation atteignant 800 m de remplissage de bassin tout en transférant les contraintes entre le linéament de transtension dextre Lewis et Clark vers le nord et le complexe de noyau Anaconda vers le sud. Des indicateurs de paléocourants vers le nord-ouest, des unités lithologiques métamorphiques foliées, des grains de muscovite âgés de 64 Ma ( 40 Ar/ 39 Ar) et des zircons âgés de 76 Ma (U-Pb) dans un grès arkosique d'environ 27 Ma concordent avec l'exhumation et l'érosion du complexe à noyau Anaconda durant l'Oligocène. Le complexe à noyau et les roches volcaniques et magmatiques dans l'éponte supérieure ont créé une importante ligne de partage des eaux au cours du le Paléogène, dispersant des débris vers le nordoues...

show abstract

Faults of the central part of the Lewis and Clark line and fragmentation of the Late Cretaceous foreland basin in west-central Montana

Cited by 42 publications

References 0 publications

The Basin and Range Province as a Composite Extensional Domain

The Basin and Range Province as a Composite Extensional Domain

Regional characteristics, tilt domains, and extensional history of the later Cenozoic Basin and Range Province, western North America

Sedimentary response to orogenic exhumation in the northern Rocky Mountain Basin and Range province, Flint Creek basin, west-central Montana

Contact Info

Product

Resources

About