Carlin Unconformity: Difference between revisions
Cyberbot II (talk | contribs) Tagging page with {{Blacklisted-links}}. Blacklisted links found. (Peachy 2.0 (alpha 7)) |
|||
| Line 1: | Line 1: | ||
{{Blacklisted-links|1= |
|||
*http://www.mining-technology.com/projects/carlin/ |
|||
*:''Triggered by <code>\bmining-technology\.com\b</code> on the local blacklist''|bot=Cyberbot II|invisible=false}} |
|||
[[File:Sedimentary-rock hosted gold deposits in Nevada.gif|thumb|350px|'''Carlin Trend''', shown with other alignments of sediment-hosted gold deposits in Nevada. Source: [[USGS]]. ]] |
[[File:Sedimentary-rock hosted gold deposits in Nevada.gif|thumb|350px|'''Carlin Trend''', shown with other alignments of sediment-hosted gold deposits in Nevada. Source: [[USGS]]. ]] |
||
Revision as of 12:08, 3 April 2014
 |
The Carlin Unconformity or Carlin Trend is a geologic feature in northeastern Nevada which represents a period of erosion or non-deposition likely associated with a collision between a tectonic crustal block called a terrane and the North American Plate. The collision occurred during the Mississippian Period, about 350 million years B.P. The collision is associated with the Antler Orogeny.[1]
The collision induced higher crustal temperatures and pressures which produced numerous hot springs along the suture zone. Several episodes of subsurface magmatism are known to have occurred subsequent to the collision, associated with tectonic forces affecting the entire Basin and Range. During each of these episodes, and particularly during the Eocene epoch, hot springs brought dissolved minerals toward the surface, precipitating them out along fissures.[2] Among these minerals were gold and silver.
The Carlin Gold trend is one of the world's richest gold mining districts. It is a belt of gold deposits, primarily in Paleozoic limy sediments, that is about 5 miles wide and 40 miles long, extending in a north-northwest direction through the town of Carlin, Nevada. Gold was first discovered in the area in the 1870s, but there was very little production until 1909, and only about 22,000 ounces was produced through 1964. By 2008, mines in the Carlin Trend had produced over 70 million ounces of gold, worth around US$85 billion at 2010 prices.[3]
See also
References
- Basin and Range, by John McPhee, published 1981 by Farrar, Straus and Giroux, New York.
- Assembling California, by John McPhee, published 1993 by Farrar, Straus and Giroux, New York.
- ^ Blakely, Ron. "Geologic History of Western US". Retrieved 2010-06-06.
- ^ Ressel, Michael W.; Henry, Christopher D. (March 2006). "Igneous Geology of the Carlin Trend, Nevada: Development of the Eocene Plutonic Complex and Significance for Carlin-Type Gold Deposits". Economic Geology. 101 (2): 347–383. doi:10.2113/gsecongeo.101.2.347.
- ^ "Update on Production and Exploration Activity in Nevada - 2009" (PDF). Nevada Bureau of Mines and Geology.
Further reading
- Carlin Trend Exploration History: Discovery of the Carlin Deposit by J. Alan Coope, Newmont Exploration, 1991
- Newmont's reserve history on the Carlin Trend, 1965 - 2001 by Dean G. Heitt, Newmont Mining Corporation
- Geologic Overview of the Carlin Trend gold deposits, by Lewis Teal and Mac Jackson, Newmont Mining Corporation
External links
- Carlin Trend at mining-technology.com, circa 2005