scholarly journals A 4,500‐Year‐Long Record of Southern Rocky Mountain Dust Deposition

2019 ◽  
Vol 46 (14) ◽  
pp. 8281-8288 ◽  
Author(s):  
Cody C. Routson ◽  
Stéphanie H. Arcusa ◽  
Nicholas P. McKay ◽  
Jonathan T. Overpeck
Keyword(s):  
Rocky Mountain ◽  
Dust Deposition ◽  
Southern Rocky Mountain

scholarly journals Supplemental Material: Postcaldera intrusive magmatism at the Platoro caldera complex, Southern Rocky Mountain volcanic field, Colorado, USA

2021 ◽  
Author(s):  
A.K. Gilmer ◽  
et al.
Keyword(s):  
Trace Element ◽  
Rocky Mountain ◽  
Volcanic Field ◽  
Trace Element Geochemistry ◽  
Zircon Geochronology ◽  
Element Geochemistry ◽  
Isotopic Compositions ◽  
Southern Rocky Mountain

<div>Table S1: Whole-rock compositions of analyzed samples. Table S2: Major and trace element geochemistry of feldspar. Table S3: Major and trace element geochemistry of pyroxene. Table S4: Major and trace element geochemistry of biotite. Table S5: Major and trace element geochemistry of amphibole. Table S6: Zircon geochronology and trace element geochemistry. Table S7: Lutetium and hafnium isotopic compositions of zircon. Table S8: Amphibole-plagioclase thermometry. Table S9: Sample locations and lithologies.<br></div>

Protracted Multipulse Emplacement of a Postresurgent Pluton: The Case of Platoro Caldera Complex (Southern Rocky Mountain Volcanic Field, Colorado)

2019 ◽  
Vol 20 (11) ◽  
pp. 5225-5250
Author(s):  
F. Tomek ◽  
A .K. Gilmer ◽  
M. S. Petronis ◽  
P. W. Lipman ◽  
M. S. Foucher
Keyword(s):  
Rocky Mountain ◽  
Volcanic Field ◽  
Southern Rocky Mountain

Structure and tectonic development of the southern Rocky Mountain trench

Tectonics ◽  
1996 ◽  
Vol 15 (3) ◽  
pp. 517-544 ◽  
Author(s):  
Arie J. van der Velden ◽  
Frederick A. Cook
Keyword(s):  
Rocky Mountain ◽  
Tectonic Development ◽  
Southern Rocky Mountain

Classification of glaciers during summer in Southern Rocky Mountain Trench using surface albedo and temperature anomalies

2020 ◽  
Author(s):  
Ali Naeimi ◽  
Martin Sharp
Keyword(s):  
Surface Temperature ◽  
Surface Albedo ◽  
Rocky Mountain ◽  
Surface Melting ◽  
Poor Correlation ◽  
Positive Temperature ◽  
Temperature Anomalies ◽  
Time Periods ◽  
Southern Rocky Mountain ◽  
Snow And Ice

&lt;p&gt;Under most atmospheric conditions, the albedo and temperature of surface snow and ice are two of the main influences on the energy budget for glacier melting. Given that surface albedo and temperature are linked, knowing where and when negative albedo and positive surface temperature anomalies coincide is important for identifying locations and time periods in which anomalously high rates of surface melting are likely. We used measurements from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensors on NASA's AQUA and TERRA satellites&amp;#160;to map the albedo and surface temperature of snow and ice &amp;#160;on glaciers in the of Southern Rocky Mountain Trench ecoregion in the summer months (June-August)&amp;#160;from 2000 to 2018. We use these data to identify specific regions and time periods in which low albedo and high surface temperature coincide since these conditions are likely to support anomalously high rates of surface melting. We also use these data to identify regions/periods in which albedo is particularly low while surface temperature is average or low, since such conditions suggest localized and/or short-term decoupling between the two parameters. We found anomalously low albedo and average/low temperature consistently at multiple glaciers during time periods when there were major forest fire events. We suggest the low albedo results from deposition of pyrogenic carbon from forest fires. We found that, on average, ~25% of the glaciers in the region experienced increasingly negative albedo anomalies and increasingly positive temperature anomalies in summer months from 2000 to 2018. However, we also found that for ~45% of the glaciers that are small, there was a poor correlation between the timing of albedo and temperature anomalies. Our results indicate that the correlation between albedo and temperature was weaker for the small glaciers, and identify specific glaciers that are likely the most vulnerable to climate warming.&lt;/p&gt;

The St. Eugene Formation and the Development of the Southern Rocky Mountain Trench

1974 ◽  
Vol 11 (7) ◽  
pp. 916-938 ◽  
Author(s):  
John J. Clague
Keyword(s):  
Rocky Mountain ◽  
Flood Plain ◽  
The United States ◽  
The North ◽  
Early Oligocene ◽  
Half Graben ◽  
History Of ◽  
Composition Structure ◽  
Southern Rocky Mountain ◽  
Block Faulting

The Tertiary history of the southern Rocky Mountain Trench is inferred from a study of the distribution, stratigraphy, fabric, lithologic composition, structure, and palynology of the Miocene St. Eugene Formation in southeastern British Columbia.The St. Eugene Formation consists of flood-plain and fan facies and represents the upper part of up to about 1500 m of sediments which accumulated in the proto-Rocky Mountain Trench upon cessation of Laramide deformation and after initiation of extension and block faulting in the eastern Cordillera during Eocene or early Oligocene time. Deep Tertiary basins in the southern Rocky Mountain Trench are bounded on the east and west by high-angle faults parallel to the Trench margins and on the north and south by faults transverse to the trend of the Trench. Block faulting of a half-graben style was probably contemporaneous with sediment deposition, but at least 600 m of displacement on the east boundary fault postdates deposition of the St. Eugene Formation. Although there is no present seismic activity along the Rocky Mountain Trench north of latitude 49°N, Holocene fault scarps and earthquakes in a zone along the Rocky Mountains of the United States attest to the continuation of block faulting south of 49°N.The St. Eugene microflora includes at least 39 genera of ferns, gymnosperms, and anthophytes. Phytogeographic reconstruction based upon the habitats of extant counter-parts indicates floral elements growing on poorly drained lowlands, adjacent slopes, and montane uplands; thus, there was moderate to high relief in southeastern British Columbia during St. Eugene time. The climate apparently was temperate, with warm summers, mild winters, and abundant, uniformly distributed precipitation. This contrasts with the present climate of the southern Rocky Mountain Trench which is semiarid with hot summers and cold winters, and suggests that the mountain barriers which presently restrict cool, moist, Pacific maritime air masses to the coast were lower during the Miocene, or that the polar seas were relatively warm.

Sign in / Sign up

Export Citation Format

Share Document