 | | Journal (article/letter/editorial) | | COMPOSITION AND PHYSICAL PROPERTIES OF THE MINERAL IDDINGSITE BY CLARENCE S. ROSS Geologist, United States...COMPOSITION, AND PHYSI- CAL PROPERTIES OF THE MINERAL IDDINGSITE By Clarence S. Ross Geologist, United States...chemical com- abundant mineral in basaltic an iddingsite; that, name was long remained matters of...following is based upon paper eight analyses of iddingsite from six localities, and while the results of...give complete understanding a composition of iddingsite, they establish it distinct mineral as a have |  | | Journal (article/letter/editorial) | | Surrey, Denver, Colorado Alkalic and Tholeiitic Basaltic Volcanism Related to the Rio Grande Depression,... Southern Colorado and Northern New Mexico Abstract: Upper Cenozoic basaltic rocks in and near the northern...northern Rio Grande depression, a major intracontincntal tension-rift structure, vary systematically...Introduction ......... ..... Acknowledgments . . . . Rio Grande depression . Hasalts ...... . . . Western basalts...followed by the Rio Grande Irom Colorado to Mexico, commonly known as the Rio Grande depression (Bryan |  | | Journal (article/letter/editorial) | | MINERALOGIST, VOL. 42, JIILY-AUGUST 1957 THE NATURE OF IDDINGSITE IN SOME BASALTIC ROCKS OF NEW MEXICO* Mryc-Snaw...Socorro,New Merico ABSRACT No description of iddingsite has demonstrated that it has a defrnite chemical...rocks from New Mexico and some from Colorado containing iddingsite show varying degrees of alteration...weathering process. The alteration of olivine to iddingsite occurs largely in basaltic rocks whose modal...crystallization. Study of iddingsite samples from New Mexico and Colorado by the *-ray powder difiraction |  | | Journal (article/letter/editorial) | | CARL E . HEDGE U.S. Geological Survey Denver, Colorado HAJIME KURASAWA Geological Survey of J a p a n...e San J u a n volcanic area in s o u t h e r n Colorado, a n d basalts of t h e Servilleta F o r m a t...conclusions. Some miscellaneous samples f r o m Colorado a n d N e w Mexico are also i n c l u d e d to...e w i t h only slight a l t e r a t i o n to iddingsite (65L120, A54-14, J 5 4 - 4 a n d 54P152), b u...a n d m a y be m o s t l y iddingsite (66L26 a n d 65L32). Th e iddingsite m a y be a deuteric effect |  | | Journal (article/letter/editorial) | | Center, Denver, Colorado 8022) Volcanic History of the San Juan Mountains, Colorado, as Indicated by...approximately in time with nearby development of the Rio Grande depression, a major rift that is the local expression...which covers about 25,000 km2 in southwestern Colorado and is well known through the studies of Larsen...Generalized geologic map of the San Juan volcanic field, Colorado, showing sample localities (keyed to Tables 2-5)...part of the field include the Beidell and Tracey Creek Quartz Latites of Larsen and Cross (1956, p. 83-86) |  | | Report (volume) | | quadrangle. 2. A, Basalt cap along Lake Creek Rim. B, Basalt north of Race Creek.._......_.___.___.._._._____._...lava. A, Columnar-jointed flow of basalt, near Race Creek. B, Tuff, agglomerate, and lava...-------_--__-__-----_-------I...along the cirque-indented rim from Elk Lake to Lake Creek Lookout (fig. 2A), but are poor west of the Little...CONTRIBUTIONS TO GENERAL GEOLOGY A. Basalt cap along Lake Creek Rim. Beneath the thin dark layer of basalt is gneissic...from saddle above Elk Lake. B. Basalt north of Race Creek. Dense columnar-jointed lavas stand as cliffs |  | | Report (issue) | | Volcanic Rocks, Southeastern SanJuan Mountains, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 852 ...Volcanic Rocks, Southeastern San Juan Mountains, Colorado By PETER W. LIPMAN GEOLOGICAL SURVEY PROFESSIONAL...volcanic rocks, southeastern San Juan Mountains, Colorado. (Geological Survey Professional Paper 852) Includes.................................. . Tuff of Rock Creek .................................. . Treasure Mountain...tuff ..................................... . Ojito Creek Member ............................. . Ra Jadero |  | | Report (volume) | | Minerals of Colorado: A 100- Year Record By EDWIN B. ECKEL GEOLOGICAL SURVEY BULLETIN 1 1 14 A...knowledge____________________________________ Future of Colorado mineralogy______________________________________...mineral localities and metallic mineral deposits of Colorado ________________________________ In pocket III...mineral localities and metallic mineral deposits of Colorado, has not been included in this reprint. Many of...especially Fischer and others, 1946). MINERALS OF COLORADO: A 100-YEAR RECORD By EDWIN B. EcKEL ABSTRACT |  | | Book (edition) | | uranium-vanadium deposits on the vegetation of the Colorado Plateau. H. Cannon L. (1953) Geobotanical...prospecting for uranium on La Ventana Mesa, Sandoval County, New Mexico. .,3d ed. H. C. Dake (1953) The uranium...and J. H. Soule (1955) Uranium ynining on the Colorado Plateau. Jack DeMent and H. C. Dake (1947) Handbook...V. C. Kelley (1955a) Regional tectonics of the Colorado Plateau and relationship to the origin and distribution...currence of uranium and vanadium minerals from the Colorado Plateaus. For maps showing the location of uranium |  | | Report (issue) | | volcanic series as seen down the valley of the Rio Grande from north of Weminuche meadows, San Cristobal...Petrology of the San Juan Region Southwestern Colorado By ESPER S. LARSEN, JR., and WHITMAN CROSS GEOLOGICAL...an area of I2fiOO square miles in southwestern Colorado UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON...GEOLOGY AND PETROLOGY OF THE SAN JUAN REGION, COLORADO vard University contributed liberally by financing...__-___________-___----_ Quartz-mica schist of Mesa Creek.____ Dubois greenstone-_____________________ Amphibole |  | | Report (issue) | | . . . . . . . . . . . 55 Srratigraphy of rhe Grande Ronde Basalt, Columbia River Basalt Group, From... . 213 Cenozoic Stratigraphy of Western Owyhee County, Idaho, by E. B. Ekren, D. H. McIntyre, E. H. Bennett...Tuff Volcanic Rocks Near the Idaho-Nevada Owyhee County, Idaho, by John Bernt and Bill Bonnichsen Chapter...of Tertiary-Quaternary Volcanic Rocks in Caribou County, Idaho, by D. W. Fiesinger, W. D. Perkins, and...components. The northeasttrending Custer and Panther Creek grabens were formed during volcanism in the cauldron |  | | Book (edition) | | of Utrecht. Dean Charles F. Poe, University of Colorado, Boulder, Colo. Dr. F. H. Pough, American Museum...wax yellow in powder. Found in pegmatite in Colorado and Sweden. Chloraluminite (AlCbTELO) is rhombohedral...quartz, microcline, and zircon near Pikes Peak, Colorado, and in a topaz mine in the Ilmen Mountains. ...alteration product of cryolite in El Paso County, Colorado. 2. Multiple halides with type formula AmB„Xp...= deep blue. Found in ore deposits, as in Pinal County, Arizona Tachyhydrite (Mg2CaCl6 ■ 12H20) is trigonal |  | | Book (edition) | | red; wax yellow in powder. Found in pegmatite in Colorado and Sweden. Very rare. Chloraluminite (AlCla•...low temperatures. Found with native tellurium in Colorado, Transylvania, etc. Very rare. Baddeleyite (Zr02)... Colorless or purple. From a fluorite mine in Colorado. Very rare. Lindac~erite (3NiO-6CuO • 2As2Os •...in regions of crystalline schists, as in Renfrew County, Ontario, and in Odenwald. In Canada it is associated...with brilliant luster. Found in carnotite ores of Colorado and Utah. Koninckite (FePO 4 • 3H2O) is in fibrous |
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