 | | Report (issue) | | of Guam I GEOLOGICAL [SURREY PROFESSIONAL PAPER 403-C Petrology of the Volcanic Rocks of Guam By...VOLCANIC ROCKS OF GUAM By JOSHUA I. TRACEY, JR., and JOHN T. STARK GEOLOGY AND HYDROLOGY OF GUAM, MARIANA ISLANDS...of the basaltic and andesitic volcanic rocks of Guam and their relations to similar rocks of Saipan and...Petrogenes Trace elements in the volcanic rocks of Guam, by Joshua elen I. Tracey, Trace Jr., and John T... Average oxide composition of volcanic rocks of Guam by age__________________________________ _ Harker |  | | Report (issue) | | and dacites from Saipan and volcanic rocks from Guam, the Palau Islands, and the Bonin Islands______...silica minerals (quartz, tridymite, cristobalite, chalcedony, and opal). Minor constituents in these rocks...of volcanic rocks from Saipan, 1 of andesite from Guam, and 5 of basalt from the islands of Alamagan, Pagan... 128 GEOLOGY OF SAIPAN, MARIANA ISLANDS north of Guam. On the west the Marianas are bounded by the Philippine...rocks of a related nature on Saipan, Tinian, and Guam, or on the islands of Alamagan, Pagan, and Agrihan |  | | Journal (issue) | | Alaska SPECIAL ARTICLES THE GEOLOGY OF THE lsLAND OF GuAM By Lie1,t.-Coni1nander P. J. Searles THE R OMANTIC...AND ~IINERALS 1 THE GEOLOGY OF THE ISLAND OF GUAM By' P. J. SEARLES Lieutenant-Commander, U. S. Navy...~lass. In the first place where is and what is Guam? Guam is the southernn1ost of the 11:ariana I slands...subsidences, some of which were geologically very recent. Guam is of volcanic origin and is Fringed with coral...in the faces of the cliffs on the eastern side of Guam, 1na rking the position o f the former sea levels |  | | Report (issue) | | Marianas, and the personnel under his command on Guam and Saipan, made it possible for the field party...probably Guam, and some have even pinpointed his stopping place as Umatac Bay (southwest Guam). In fact...accounts are ambiguous, and Tinian, rather than Guam, may have been the site of Magellan's landing. Even...latitude and distance between islands seem to favor Guam, however, even though the point cannot be settled...1698 the entire remaining population was removed to Guam where it could be kept under close surveillance |  | | Journal (article/letter/editorial) | | Opal (Cacholong). Chalky white crust on a gray chalcedony pebble. Collected on the beach. Quartz (Agate)...Gray pebble that vas found on the beach. Quartz (Chalcedony). Grayish pebbles from east end of island. Quartz...central part of the state. IOWA — A nice reddish chalcedony pebble, 1 inch in diameter, has been, found by...galena have been found at Boxbach, Nassau, Germany. GUAM — G. H. Haldén, 270 Lewis Ave., Millbrae, Calif...Mergagan Point, at the north end of the island of Guam. The specimen contains green, yellow and red bands |  | Farkaš, Juraj, Chrastný, Vladislav, Novák, Martin, Čadkova, Eva, Pašava, Jan, Chakrabarti, Ramananda, Jacobsen, Stein B., Ackerman, Lukáš, Bullen, Thomas D. (2013) Chromium isotope variations (δ53/52Cr) in mantle-derived sources and their weathering products: Implications for environmental studies and the evolution of δ53/52Cr in the Earth’s mantle over geologic time. Geochimica et Cosmochimica Acta, 123. 74-92 doi:10.1016/j.gca.2013.08.016 | Journal (article/letter/editorial) | | Planetary Sciences, Harvard University, Cambridge, MA, USA c Center for Earth Sciences, Indian Institute of...Republic e U.S. Geological Survey, Menlo Park, CA, USA Received 1 March 2013; accepted in revised form...222 PrFUK 9 N. Caledonia 671 PrFUK 21 Rio Cayo 267 Guam PAS 2 San Serapio 16 PrFUK 9 Selukvwe 536 PAS...Cr-rich minerals such as crocoite, fuchsite, chrome chalcedony, chrome diopside, chrome tremolite, stichtite...tremolite Chrome pyrope Chrome diopside Chrome chalcedony FeMgCrIII2O4 PbCrVIO4 Mg(Fe, CrIII)3Si2O5 (OH)4 |  | | Report (issue) | | LIBRAR'l LIBRARY COPY General Geology of Guam GEOLOGICAL SURVEY PROFESSIONAL PAPER 403-A suRe Ao...31971 •. GENERAL GEOLOGY OF GUAM • ,. Dissected upland, south Guam . A part of the Bolanos structural...-·... .:. ... .. I ' .,. General Geology of Guam By JOSHUA I. TRACEY, JR., SEYMOUR 0. SCHLANGER,...DOAN, and HAROLD G. MAY GEOLOGY AND HYDROLOGY OF GUAM, MARIANA ISLANDS GEOLOGICAL SURVEY PROFESSIONAL...: Tracey, Joshua Irving, 1906General geology of Guam, by Joshua I. Tracey, Jr. [and others] Washington |  | | Journal (issue) | | Dave and Kathy Farnsworth), and Gary has been to Guam, the Philippines, England (where he served his mission)...finest agate, jasper, geodes and other forms of chalcedony, mainly from family-owned property in Mexico |  | | Report (issue) | | Soils from Guam GEOLOGICAL SURVEY PROFESSIONAL PAPER 403-F Mineralogy of Selected Soils from Guam By DOROTHY... By CARL H. STENSLAND GEOLOGY AND HYDROLOGY OF GUAM, MARIANA ISLANDS GEOLOGICAL SURVEY PROFESSIONAL...mineralogical study of selected soil samples of Guam, including data on chemical composition, grain-size...volcanic rocks _ _ _ _ Asan clay on volcanic rocks_____ Guam clay on limestones _______ Fossil red latosol_____________...limestones__________________________ Comparison of soils of Guam with those of similar parentage in other selected |  | | Catalog/List | | affordable $7.95 GUAM FOSSILIZED CRABS; Macrophthalmus latreillei, Apra Harbor, Guam: Miocene to Pleistocene...are remarkably well preserved. From a colleclor in Guam and again acquired in trade. These crabs range from...00 each #3) 3 to 4 inch specimens $15.00 each CHALCEDONY: Mexico: Not real showy unUI placed under a light |  | | Journal (issue) | | geodes containing quartz crystals and botryoidal chalcedony collected from the mouth of a creek feeding the...outward-bending arc; one island is the U.S. territory of Guam. The western Pacific has other island arcs as well...island arc called the Marianas. The largest island is Guam, a U.S. territory. Source: Wikipedia (2017). of |  | | Report (issue) | | fragmental igneous rock, argillite, or crustified chalcedony and quartz. Peperite (a mixture of sedimentary...west of Chernofski Harbor, secondary quartz and chalcedony are prominent as crusts between pillows. The...the largerskeletal crystals and phenocrysts. Chalcedony and (or) zeolite amygdules and veinlets compose... in New Zealand (Bartrum, 1930, p. 447), and in Guam (N. D. Stearns, 1938, p. 7), and pillows are known... 1956. Stearns, N. D., 1938, Pillow-lavas of Guam: Guam Recorder, v. 14, no. 11, p. 7-8. Sundius, N. |  | | Journal (issue) | | products, for example to expand marketing to nearby Guam that is an important tourism destination. The local... Basel), Jeremy Norris (Oasis Pearl, Albion CA, USA), Imura Daiji & Abdulla Rashed AlSuwaidi (RAK Pearls...artificially coloured green chalcedony (stained by Cr- chrysoprase for testing. Chalcedony, the cryptocrystalline...also as a colouring element for naturally green chalcedony of quartz, is coloured green naturally by nanosize...hues are the result of light scattering in the chalcedony matrix (Sachanbinski et al. 2001), an effect |  | | Book | | crystalline and chalcedony. Crystalline quartz grows in a single crystal, while chalcedony is formed by...smoky quartz (brown) and aventurine (green). Chalcedony quartz includes agates and onyx, which are often...shimmer like opal. Chrysoprase is a bright green chalcedony that resembles jadeite. It is used in carvings...cut into cabochons. Jasper is an opaque form of chalcedony which sometimes grows in colored bands that give...oe Sapphire E @ (Manila CN o Philippine Sea GUAM © PHILIPPINES a ¢ x SAMAR eR Cys lina Sea “amboanse: |  | | Book | | Publications P.O. Box 13384 Los Angeles, CA 90013-0384 USA (Include a self-addressed, stamped envelope with...(Chrysoberyl) 29 Amethyst & Other Quartz Gems 31 Chalcedony 33 Emerald, Aquamarine & Other Beryls 36 Garnet...to opaque stones such as jade, malachite and chalcedony are sold by the piece or stone size, not by weight...of low quality. gemstones like lapis lazuli, chalcedony and agate don’t surface cracks to accept dye...Treatments 21 dyed. Black onyx is just dyed chalcedony. Pearls and matrix opal may also be dyed. SURFACE |  | | Journal (issue) | | crystals occur on numerous stones ranging from chalcedony to Jasper. As in any sand deposit, many specimens...scales of chlorite. Cryptocrystalline Varieties CHALCEDONY is a very abundant variety of quartz in these...shown fluorescence. 4 One attractive piece of chalcedony is ropelike in appearance and has drusy quartz...collected. This is white and gray botryoidal chalcedony on a base of impure pink quartz. When certain...stone were ground flat it was revealed that the chalcedony grew in concentric rings around a hexagonal center |  | | Catalog/List | | UV light. #1) 1x1 inch specimens: $4.00 each CHALCEDONY: Mexico: Not real showy until placed under a...affordable $10.00 each. GUAM FOSSILIZED CRABS: Macrophthalmus latreillei, Apra Harbor, Guam: Miocene to Pleistocene...are remarkably well praserved. From a collector in Guam and again acquired in trade. These crabs range from |  | | Journal (issue) | | $1.00 per pound plus postage. BLUE-GRAY & RED CHALCEDONY AGATE at $1.00 per pound plus postage. SNOWFLAKE...jasper, near Lake Mead, Nevada* Jun. '46—Agate, chalcedony, etc., Arizona* Aug. '46—Aragonite "fossils"...'47—Geodes at Searchlight, Nevada* Aug. '47—Agate, chalcedony, Fossil sprs., Arizona* Oct. '47—Collecting crystals...fields, Wayne Wonderland, Utah* Jul. '48—Agate and chalcedony, Turtle nits., Calif.* Oct. '48—Ancient Beach...a tramp run between Yokohama, the Persian Gulf, Guam and a score of other ports on Pacific shores. He |  | | Catalog/List | | These are all deeply hollow and have banded chalcedony that fluoresces bright green coated with drusy...only $1.50 each. GUAM FQSSH !7Fn CRABS: Macrophthalmus latreillei, Apra Harbor, Guam: Miocene to Pleistocene...are remarkably well preserved. From a collector in Guam and again acquired in trade. These crabs range from |  | | Catalog/List | | FLUORESCENT GEODES: Chihuahua, Mexico: Showy chalcedony geodes from 2 to 4 inches in diameter that fluoresce...and $10.00 each . GUAM FOSSILIZED CRABS: Macrophthalmus latreillei, Apra Harbor, Guam: Miocene to Pleistocene...a large geode at one time. $12.00 STILBITE ON CHALCEDONY: Jalgoan, India: showy pink sheen crystals to...specimen, with loads of snow white microcrystalline chalcedony hair-like crystals forming the base. This ones |  | | Journal (issue) | | knowing that I was one, he added that he had found chalcedony roses and agate on the trail to the springs....of Irving. Hike up Fossil springs road. 93.9—Chalcedony scattered on either side of Fossil springs road...road, he shook his head. "There was a perfect chalcedony rose," he mourned, "but we better not stop now...on the way down." That particular area showed chalcedony along the road for more than a mile. We AUGUST...the material we saw was in the form of white chalcedony roses and a mottled white agate with moss and |  | | Journal (issue) | | the District of Columbia: on Alaska, Canal Zone, Guam, a11d Hawai i; and on 40 foreign countrie,. The...one time the local church agate, jasper, flint, chalcedony, ironstone used it as an incense-may do so yet...with material. This material is of no impora chalcedony vein which can be traced tance commercially....opaque, red _garnets, of ten better than now. Chalcedony is plentiful but not of too an inch in diameter...rusy chert, as well as many quartz variations, chalcedony, jasper, etc. Mrs. Stockwell is very fond of |  | Stüben, Doris, Taibi, Nasr.Eddine, McMurtry, Gary M., Scholten, Jan, Stoffers, Peter, Zhang, Deyu (1994) Growth history of a hydrothermal silica chimney from the Mariana backarc spreading center (southwest Pacific, 18°13′N) Chemical Geology, 113 (3) 273-296 doi:10.1016/0009-2541(94)90071-x | Journal (article/letter/editorial) | | University of Hawaii, 1000 Pope Road, Honolulu, HI 96822, USA CFirstInstitute of Oceanography, State OceanicAdministration...blocks of older volcanic arc and forearc crust (e.g., Guam, Saipan, Rota and Tinian) comprising the frontal...the form of void-filling, cryptocrystalline, chalcedony-like aggregates showing spherulitic extinction |  | | Journal (article/letter/editorial) | | the Troodos Massif were commonly vesicular with chalcedony and zeolites infilling the vesicles. Gass et al...and Nisbett, 1995; Maehara and Maeda, 2004) and Guam (Reagan and Meijer, 1984). Forearc magmatism, magmatism...lavas must result from silica addition, either as chalcedony in vesicles or silicification in greenschist facies...and geochemistry of early arc-volcanic rocks from Guam. Geological Society of America Bulletin 95, 701–713 |  | | Journal (issue) | | apparent textural similarity between zebraic chalcedony and herringbone calcite (Kerans 1982; Graber...(Simonson et al. 1993), whereas banding in zebraic chalcedony is purely an optic-axis effect seen with crossed...fiber elongation, a characteristic of zebraic chalcedony. This banding is superficially similar to that...Simonson et al. 1993). but the banding in zebraic chalcedony is due to rotation of the c axis within the plane...Fonnation (Oligocene), south Texas, ACKNOWLEDGMENTS USA: products of diagenesis: Geochemica et Cosmochimica |
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