1 / 5

The Idaho Batholith

This study explores the Idaho Batholith's geological features, focusing on Trapper Peak in the Bitterroot Mountains. At 10,157 feet, Trapper Peak showcases complex lithospheric structures, including migmatites and anatectic granites. Key findings involve the relationship between melt migration and deformation, illustrated by various geophysical maps, including Moho depth variations and tomographic models. The research offers insights into the tectonic evolution of the region, especially during the Cretaceous period, highlighting significant magmatic and transpressional events affecting the western Idaho landscape.

nituna
Télécharger la présentation

The Idaho Batholith

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Idaho Batholith Kevin Kwong Andrew McCauley Trapper Peak, Bitterroot Mountains; 10,157’ http://geology.about.com/library/bl/maps/n_statemap_ID.htm http://photosunion.com/photos/Trapper-Peak-Bitterroot-Mountains-Montana/

  2. (Snee et al. 1995, fig. 10.28) (Foster et al. 2001, fig. 17)

  3. (King and Valley 2001, fig. 8) Field photos of migmatite from eastern pluton border. A) ptygmatic granite veins feeding larger granite mass. B) anatecticplg, kspar, qtz, in gneiss. C) Anatectic vein with biotite. D) deformation enhanced melt migration suggested by vein size increase from right to left. (Foster et al. 2001, fig. 4) (Foster et al. 2001, fig. 12)

  4. VELOCITY STRUCTURE AND LITHOSPHERE CONSTRAINTS OF THE IDAHO BATHOLITH REGION Figure Above: Map of Moho depth derived from H − stacking analysis. Red colors denote shallower Moho, blue colors denote deeper Moho. Geologic provinces include Cascade volcanic arc (CM), Blue Mountains (BM), High Lava Plains (HLP), Columbia River basin (CRB), Snake River Plain (SRP), Idaho batholith (IB), Owyhee Plateau (OP), Modoc Plateau (MP), and Great Basin (GB) Figure Above: Cross sectional view through tomographic model. Warm colors represent regions of reduced velocities and cool colors represent regions of increased velocities. Roth et al. 2008 Eagar et al. 2011

  5. Porphyry Molybdenum deposits of the Idaho batholith area. (Worthington 2007, fig. 2) Figure Above: Tectonic model. A: During middle Cretaceous time, full magmatic arc developed in western Idaho . B: In Late Cretaceous time, while magmatic arc was still active, transpressional deformation in western Idaho shear zone resulted in east-west shortening. (Giorgiset al. 2005, fig. 4)

More Related