 | | Journal (article/letter/editorial) | | Pikes Peak batholith (Colorado, USA) revisited: A SIMS and LA-ICP-MS study of zircon U-Pb ages combined...Pikes Peak batholith (Colorado, USA) revisited: A SIMS and LA-ICP-MS study of zircon U-Pb ages combined... Pikes Peak batholith (Colorado, USA) revisited: A SIMS and LA-ICP-MS study of zircon U-Pb ages combined... James Hall, Durham, New Hampshire 03824-3589, USA 2 Laboratoire de Géologie de Lyon, Ecole Normale...Cedex, France Keywords: Pikes Peak Batholith, Zircon, U-Pb ages, Hf isotopes, Proterozoic Abstract: |  | | Journal (issue) | | Pegmatites in the Pikes Peak Batholith, Central Colorado Daniel E. Kile Research Associate, Denver Museum...Nature & Science 5176 Black Bear Run - Littleton, Colorado 801215 Email: centennial87@comcast.net were sparse...throughout the Pikes Peak batholith in central Colorado, and many of them provide spectacular thumbnail-...(PPB) in central Colorado. Although some minerals, such as fluorite, hematite, and zircon, commonly occur...batholith, in an area north of Florissant in Teller County, taken prior to the arsoncaused 2002 Hayman fire |  | | Journal (article/letter/editorial) | | IVAN JACOBSON 1714 S. Clarkson Street Denver, Colorado 80210 markivanjacobson@gmail.com No pegmatite...Granite, near Red Stone quarry, Conway, Carroll County, New Hampshire. Henry Minot specimen and photo...Peak, Teller and Park counties, CO, USA Crystal Park–Bear Creek, El Paso County, CO, USA Pikes Peak Granite... 3 Mount Antero and Mount White, Chaffee County, CO, USA Mount Antero Granite NYF Miarolitic beryl...Mountains, Boise, Custer and Elsmore counties, ID, USA Sawtooth Granite in the Idaho batholith NYF Miarolitic |  | | Journal (article/letter/editorial) | | DANIEL E. KILE 5176 Black Bear Run Littleton, Colorado 80125 dkile4@comcast.net Albite and Microcline...Microcline From the Crystal Peak Area Teller County, Colorado A MYSTERY REVISITED F or many years collectors...crystal from the Crystal Peak area, Teller County, Colorado; this crystal was enclosed in quartz, preserving...Crystal Peak area north of Florissant in Teller County, Colorado. The contents of this find were among the...throughout the Lake George ring complex (LGR) north of Florissant and Lake George in Teller and Park counties |  | | Journal (article/letter/editorial) | | COLORADO TOPAZ Topaz, Al Si0 (F,OH) is one of Colorado's better known gem minerals. Though Col orado...(PJM), 975 (TCM) Box 25046, Federal Center Denver, Colorado 80225-0046 A ccording to Cross and Hillebrand...discovery of Colorado topaz was made about 1880 by a Mr. Thiebald,* "a prospector of Colorado Springs."...dimension, associated with feldspar, smoky quartz, and zircon. The large fragment was said to be from near Florissant...been in the Crystal Park area. The largest fine-quality topaz specimens in Colorado occur in several separate |  | | Journal (article/letter/editorial) | | miarolitic cavities in the Lake George ring complex and vicinity, Colorado DANIEL E. KILE* AND D.D. EBERL...Geological Survey, 3215 Marine Street, Boulder, Colorado, 80303-1066, U.S.A ABSTRACT The Crystal Peak...of the Pikes Peak batholith, near Lake George in central Colorado, is world-renowned for its crystals...miarolitic cavities in the Crystal Peak area in central Colorado. Finding the crystal growth mechanism may be the...exposed over an area of about 5000 km2 in central Colorado. It is a Precambrian, anorogenic, epizonal intrusive |  | | Journal (article/letter/editorial) | | miarolitic cavities in the Lake George ring complex and vicinity, Colorado DANIEL E. KILE* AND D.D. EBERL...Geological Survey, 3215 Marine Street, Boulder, Colorado, 80303-1066, U.S.A ABSTRACT The Crystal Peak...of the Pikes Peak batholith, near Lake George in central Colorado, is world-renowned for its crystals...miarolitic cavities in the Crystal Peak area in central Colorado. Finding the crystal growth mechanism may be the...exposed over an area of about 5000 km2 in central Colorado. It is a Precambrian, anorogenic, epizonal intrusive |  | | Journal (article/letter/editorial) | | Two Point claim, Pikes Peak batholith, Teller County. The Collector’s Edge specimen, Jeff Scovil photo...Mail Stop 150, Box 25046 Federal Center Denver, Colorado 80225 pmodreski@usgs.gov C olorado is, of course...been written as guides to mineral collecting in Colorado. A classic, which went through three major editions...1951 version with a slightly different title), is Colorado Gem Trails and Mineral Guide, by Pearl (1951,...up-to-date guidebook to the state’s minerals is Colorado Rockhounding, by Voynick (1994). Other published |  | | Journal (article/letter/editorial) | | Survey, 3215 Marine Street, Suite E-127, Boulder, Colorado 80303, U.S.A. 2 Geological Institute RAN, Pyzevskij...through magma mixing or crystal settling), various complex scenarios can be imagined that could approximate...Eberl 1999); (B) Zircon B, L total (Nemchin et al. 2001); (C) Calcite, SE Colorado (Kile et al. 2000);...paper); (F) Garnet, Specimen 2 (Kretz 1966). Only the zircon CSD measurement (Fig. 1B) possibly is subject to...chromite, and bronzite crystals in the Stillwater Complex, Montana. The mechanism that leads to proportionate |  | | Journal (article/letter/editorial) | | magma crystallisation. Accessory minerals (fluorite, zircon, REE-F-carbonate, Ti oxide, apatite, and titanite)...Allen and McPhie, 2002; Allen et al., 2008). U–Pb zircon dating of the GRV has yielded ages of 1591–1592...interval between 1583 ± 7 and 1598 ± 2 Ma (U–Pb zircon dates; Flint, 1993). The giant Cu–Au–U ± Ag Olympic...Chitanilga Volcanic Complex at Kokatha (B) and Glyde Hill Volcanic Complex at Lake Everard (C). After...The Chitanilga Volcanic Complex at Kokatha and Glyde Hill Volcanic Complex at Lake Everard are the two best |  | | Journal (issue) | | LaPlante, Jean des Revières, Anthony Gleckler, George Polman, Tom Spann, Mark Mauther, Chris Stefano...Vanadinite 3.4 cm, from the North Geronimo mine, La Paz County, Arizona. Dick Morris collection; Jeff Scovil photo...Jean des Revières Pinal Geology Museum John Ebner George & Deborah Polman Flagg Mineral Foundation Members...cm, from the Defiance mine near Gleeson, Cochise County, Arizona. Ken Donn photo. 6 Supplement to The...cm, from the Breckenridge district, Summit County, Colorado. Ken Donn photo. Wulfenite (hot-pink), 3 |  | | Journal (article/letter/editorial) | | it that contains garnet crystals with unusually complex compositional zoning. Regional and local geology...and ilmenite, and trace amounts of allanite and zircon. Discontinuous layers of polycrystalline quartz...are dominantly quartz, but allanite, ilmenite, zircon, titanite, apatite, and rare tourmaline also were...avoiding as many inclusions as possible in areas with complex compositional zoning. In addition, some shorter...higher spatial resolution across regions with complex compositional zoning. All of the traverses were |
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