scholarly journals Supplemental Material: Mesoproterozoic–Early Cretaceous provenance and paleogeographic evolution of the Northern Rocky Mountains: Insights from the detrital zircon record of the Bridger Range, Montana, USA

2020 ◽  
Author(s):  
Chance B. Ronemus ◽  
et al.
Keyword(s):  
Early Cretaceous ◽  
Data Reduction ◽  
Rocky Mountains ◽  
Detrital Zircon ◽  
Analytical Techniques ◽  
Northern Rocky Mountains ◽  
Sample Information ◽  
Icp Ms ◽  
Reduction Methods

Analytical techniques, data reduction methods, ICP-MS zircon U-Pb datasets, comparison of age-probability curves generated using PDPs and various KDE bandwidths, sample information, and NMF details and results.

scholarly journals Supplemental Material: Mesoproterozoic–Early Cretaceous provenance and paleogeographic evolution of the Northern Rocky Mountains: Insights from the detrital zircon record of the Bridger Range, Montana, USA

2020 ◽  
Author(s):  
Chance B. Ronemus ◽  
et al.
Keyword(s):  
Early Cretaceous ◽  
Data Reduction ◽  
Rocky Mountains ◽  
Detrital Zircon ◽  
Analytical Techniques ◽  
Northern Rocky Mountains ◽  
Sample Information ◽  
Icp Ms ◽  
Reduction Methods

Analytical techniques, data reduction methods, ICP-MS zircon U-Pb datasets, comparison of age-probability curves generated using PDPs and various KDE bandwidths, sample information, and NMF details and results.

scholarly journals Mesoproterozoic−Early Cretaceous provenance and paleogeographic evolution of the Northern Rocky Mountains: Insights from the detrital zircon record of the Bridger Range, Montana, USA

2020 ◽  
Author(s):  
Chance B. Ronemus ◽  
Devon A. Orme ◽  
Saré Campbell ◽  
Sophie R. Black ◽  
John Cook
Keyword(s):  
Early Cretaceous ◽  
Detrital Zircon ◽  
Foreland Basin ◽  
Mountain Range ◽  
Thrust Belt ◽  
Sediment Sources ◽  
Middle Cambrian ◽  
Sediment Dispersal ◽  
Northern Rocky Mountains ◽  
Basin System

The Bridger Range of southwest Montana, USA, preserves one of the most temporally extensive sedimentary sections in North America, with strata ranging from Mesoproterozoic to Cretaceous in age. This study presents new detrital zircon geochronologic data from eight samples collected across this mountain range. Multidimensional scaling and non-negative matrix factorization statistical analyses are used to quantitatively unmix potential sediment sources from these and 54 samples compiled from previous studies on regional correlative strata. We interpret these sources based on reference data from preserved strata with detrital zircon signatures likely representative of ancient sediment sources. We link these sources to their sinks along sediment dispersal pathways interpreted using available paleogeographic constraints. Our results show that Mesoproterozoic strata in southwest Montana contain detritus derived from the nearby craton exposed along the southern margin of the fault-bounded Helena Embayment. Middle Cambrian strata were dominated by the recycling of local sources eroded during the development of the Great Unconformity. In Devonian−Pennsylvanian time, provenance in southwest Montana shifted to more distal sources along the northeastern to southeastern margins of Laurentia, but more western basins received detritus from outboard sources along a tectonically complicated margin. By the Late Jurassic, provenance in the developing retroarc foreland basin system was dominated by Cordilleran magmatic arcs and fold-thrust belt sources to the west. Eastward propagation of the fold-thrust belt caused recycling of Paleozoic and Jurassic detritus into the foreland basin to dominate by the Early Cretaceous.

scholarly journals Major reorganization of the Snake River modulated by passage of the Yellowstone Hotspot

2021 ◽  
Author(s):  
Lydia M. Staisch ◽  
Jim E. O’Connor ◽  
Charles M. Cannon ◽  
Chris Holm-Denoma ◽  
Paul K. Link ◽  
...  
Keyword(s):  
Rocky Mountains ◽  
Detrital Zircon ◽  
Columbia River ◽  
Snake River Plain ◽  
Snake River ◽  
Columbia Basin ◽  
Northern Rocky Mountains ◽  
Yellowstone Hotspot ◽  
River Plain ◽  
Hells Canyon

The details and mechanisms for Neogene river reorganization in the U.S. Pacific Northwest and northern Rocky Mountains have been debated for over a century with key implications for how tectonic and volcanic systems modulate topographic development. To evaluate paleo-drainage networks, we produced an expansive data set and provenance analysis of detrital zircon U-Pb ages from Miocene to Pleistocene fluvial strata along proposed proto-Snake and Columbia River pathways. Statistical comparisons of Miocene-Pliocene detrital zircon spectra do not support previously hypothesized drainage routes of the Snake River. We use detrital zircon unmixing models to test prior Snake River routes against a newly hypothesized route, in which the Snake River circumnavigated the northern Rocky Mountains and entered the Columbia Basin from the northeast prior to incision of Hells Canyon. Our proposed ancestral Snake River route best matches detrital zircon age spectra throughout the region. Furthermore, this northerly Snake River route satisfies and provides context for shifts in the sedimentology and fish faunal assemblages of the western Snake River Plain and Columbia Basin through Miocene−Pliocene time. We posit that eastward migration of the Yellowstone Hotspot and its effect on thermally induced buoyancy and topographic uplift, coupled with volcanic densification of the eastern Snake River Plain lithosphere, are the primary mechanisms for drainage reorganization and that the eastern and western Snake River Plain were isolated from one another until the early Pliocene. Following this basin integration, the substantial increase in drainage area to the western Snake River Plain likely overtopped a bedrock threshold that previously contained Lake Idaho, which led to incision of Hells Canyon and establishment of the modern Snake and Columbia River drainage network.

Spatial databases for the geology of the northern Rocky Mountains - Idaho, Montana, and Washington

2005 ◽  
Author(s):  
Michael L. Zientek ◽  
Pamela D. Derkey ◽  
Robert J. Miller ◽  
J. Douglas Causey ◽  
Arthur A. Bookstrom ◽  
...  
Keyword(s):  
Rocky Mountains ◽  
Spatial Databases ◽  
Northern Rocky Mountains

Guide to geophysical data for the northern Rocky Mountains and adjacent areas, Idaho, Montana, Washington, Oregon, and Wyoming

2004 ◽  
Author(s):  
Edward A. Mankinen ◽  
Thomas G. Hildenbrand ◽  
Michael L. Zientek ◽  
Stephen E. Box ◽  
Arthur A. Bookstrom ◽  
...  
Keyword(s):  
Rocky Mountains ◽  
Geophysical Data ◽  
Northern Rocky Mountains
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