CRG Colloquium Series

Fall 2008

The USGS Central Region Colloquium Series is proud to present free lectures by our preeminent scientists located throughout the region. Guest lectures by agency and university partners are also presented. Topics include earth and life science issues such as wildfire, earthquake, and flood hazards; energy resources; climate change; invasive species; and wildlife resources.

Presentations are open to the public and are given on Thursday afternoons from 1:30 to 2:30 p.m. in the Denver Federal Center’s Foord Lecture Room, located in Building 20 (room B-1409; use entrance W-3).

We hope that you will find an opportunity to participate in the USGS Central Region Colloquium Series, whether as a contributor or attendee.

Wednesday, November 12 @ 10:00

The Iron Hill (Powderhorn) carbonatite complex, Gunnison County, Colorado—A potential source of several uncommon mineral resources

Bradley S. Van Gosen, USGS Minerals Team

The Iron Hill (Powderhorn) carbonatite, located about 35 km south-southwest of Gunnison, Colorado, is a 570 million-year-old alkalic intrusive complex with a prominent carbonatite stock at its core. The complex, well exposed across 31 km2, may be the best example of the carbonatite-alkalic rock association in the United States. It is composed of an outer ultramafic pyroxenite zone intruded by younger alkalic masses (uncompaghrite, ijolite, nepheline syenite) and the central carbonatite stock (youngest unit). In addition to its interesting petrologic and geologic characteristics, the Iron Hill complex is notable for enrichments of titanium, rare earth elements, thorium, niobium (columbium), vanadium and deposits of vermiculite. None of these resources has been...>>MORE
Upcoming Lectures
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Past Lectures
• 29 May: Understanding Microbial Methanogenesis of Coal
• 1 May: Effect of trace metals in prostate cancer
• 1 April: Geological and Health Sciences – Defining the Interface
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How to Participate
Peter Modreski (303-202-4766) is the series coordinator.  If you wish to schedule a lecture or presentation, please contact the appropriate discipline science coordinator.

This is a Cyber Talk

Concurrently presented via the Internet

How to participate via the Web:

If you would like to connect to view this meeting over the internet or by audio via teleconference bridge:
Please send an email message (in advance) to Pete Modreski at pmodreski@usgs.gov

He will respond by forwarding an e-invitation to you, which will give instructions and the exact url from which you can register to participate in this meeting online.

Anyone in or outside of the USGS may do this and there is no extra charge for the call, but it is a long distance call to Reston, VA.

If you have any questions, please contact Pete Modreski, 303-202-4766, pmodreski@usgs.gov


Listserv Notification of Upcoming Presentations
To receive e-mail notification of upcoming presentations, please send the following email message to listproc@listserver.usgs.gov:

Subscribe CR-USGS-colloquium <enter your name>

Example:

Subscribe CR-USGS-colloquium George Geologist
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