scholarly journals An ignimbrite caldera from the bottom up: Exhumed floor and fill of the resurgent Bonanza caldera, Southern Rocky Mountain volcanic field, Colorado

Geosphere ◽  
2015 ◽  
Vol 11 (6) ◽  
pp. 1902-1947 ◽  
Author(s):  
Peter W. Lipman ◽  
Matthew J. Zimmerer ◽  
William C. McIntosh
Keyword(s):  
Rocky Mountain ◽  
Volcanic Field ◽  
Bottom Up ◽  
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

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

Geosphere ◽  
2021 ◽  
Author(s):  
Amy K. Gilmer ◽  
Ren A. Thompson ◽  
Peter W. Lipman ◽  
Jorge A. Vazquez ◽  
A. Kate Souders
Keyword(s):  
Magma Mixing ◽  
Rocky Mountain ◽  
Volcanic Field ◽  
Caldera Collapse ◽  
Hydrothermal Mineralization ◽  
Show Evidence ◽  
Magma Pulses ◽  
Magmatic History ◽  
Southern Rocky Mountain

The Oligocene Platoro caldera complex of the San Juan volcanic locus in Colorado (USA) features numerous exposed plutons both within the caldera and outside its margins, enabling investigation of the timing and evolution of postcaldera magmatism. Intrusion whole-rock geochemistry and phenocryst and/or mineral trace element compositions coupled with new zircon U-Pb geochronology and zircon in situ Lu-Hf isotopes document distinct pulses of magma from beneath the caldera complex. Fourteen intrusions, the Chiquito Peak Tuff, and the dacite of Fisher Gulch were dated, showing intrusive magmatism began after the 28.8 Ma eruption of the Chiquito Peak Tuff and continued to 24 Ma. Additionally, magmatic-hydrothermal mineralization is associated with the intrusive magmatism within and around the margins of the Platoro caldera complex. After caldera collapse, three plutons were emplaced within the subsided block between ca. 28.8 and 28.6 Ma. These have broadly similar modal mineralogy and whole-rock geochemistry. Despite close temporal relations between the tuff and the intrusions, mineral textures and compositions indicate that the larger two intracaldera intrusions are discrete later pulses of magma. Intrusions outside the caldera are younger, ca. 28–26.3 Ma, and smaller in exposed area. They contain abundant glomerocrysts and show evidence of open-system processes such as magma mixing and crystal entrainment. The protracted magmatic history at the Platoro caldera complex documents the diversity of the multiple discrete magma pulses needed to generate large composite volcanic fields.

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
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