 | | 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) | | 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 |  | | Report (issue) | | Limestones of Guam GEOLOGICAL SURVEY PROFESSIONAL PAPER 403-D Petrology of the Limestones of Guam By SEYMOUR...HATI-IAWAY and DOROTHY CARROLL GEOLOGY AND HYDROLOGY OF GUAM, MARIANA ISLANDS GEOLOGICAL SURVEY PROFESSIONAL...---------------------- Limestone formations of Guam ______________________ _ Limestone of Eocene (b)...the Alifan Limestone. Phosphatic limestone from Guam and from Anguar, Palau Islands. Limestone from the...from Kirkuk, Iraq. Insoluble residues from selected Guam Limestone. Page FIGURE 1. Columnar stratigraphic |  | Ishizuka, Osamu, Tani, Kenichiro, Reagan, Mark K., Kanayama, Kyoko, Umino, Susumu, Harigane, Yumiko, Sakamoto, Izumi, Miyajima, Yuki, Yuasa, Makoto, Dunkley, Daniel J. (2011) The timescales of subduction initiation and subsequent evolution of an oceanic island arc. Earth and Planetary Science Letters, 306 (3) 229-240 doi:10.1016/j.epsl.2011.04.006 | Journal (article/letter/editorial) | | Trowbridge Hall, University of Iowa, Iowa City, IA 52242, USA d Department of Earth Sciences, Kanazawa University... A forearc basalt from the Mariana forearc near Guam produced a similar 40Ar/39Ar age of 51.1 Ma. The...oceanic island arc extends from Honshu, Japan to Guam, and resulted from subduction of the Pacific Plate...volcanic front (Fig. 1A). This forearc high includes Guam, Rota, Tinian, and Saipan, where Eocene to Oligocene...explored the Mariana fore-arc to the southeast of Guam and investigated the volcanic stratigraphy of the |  | Reagan, Mark K., McClelland, William C., Girard, Guillaume, Goff, Kathleen R., Peate, David W., Ohara, Yasuhiko, Stern, Robert J. (2013) The geology of the southern Mariana fore-arc crust: Implications for the scale of Eocene volcanism in the western Pacific. Earth and Planetary Science Letters, 380. 41-51 doi:10.1016/j.epsl.2013.08.013 | Journal (article/letter/editorial) | | Sciences, University of Iowa, Iowa City, IA 52242, USA Hydrographic and Oceanographic Department of Japan...University of Texas at Dallas, Richardson, TX 75083, USA b a r t i c l e i n f o Article history: Received...b s t r a c t The Mariana fore-arc southeast of Guam consists of ophiolitic lithologies related to subduction...trench slope of the Mariana fore-arc southeast of Guam (Fig. 1) are similar to those that make up many...seafloor spreading. One FAB from the fore-arc near Guam was dated at 51.1 ± 1.5 Ma * Corresponding author |  | | Journal (article/letter/editorial) | | porphyritic with phenocrysts of either hornblende or augite. One dike, comprising a finegrained spessartite...aphanitic facies. The chromites in the fine-grained and augite-spessartites are significantly higher in Cr/ (Cr+A1)...composed essentially of hornblencle, plagioclase, and augite. They, with some exception, exhibit porphyritic...brown hornblende of 2 5 mm in size or rarely by augite of the same grain size. The phenocrysts are evenly...Actinolite is porous, indicating its derivation from augite. It is in some instances rimmed with brown hornblende |  | | Report (issue) | | __________ Andesites-_-___-_---__--_______-_-_-___-------Augite-hypersthene andesite________________ General features...145 Petrography—Continued Andesites—Continued Augite-hypersthene andesite—Continued Secondary rock ...rtz-bearing augite-hypersthene andesite---------_________________ Quartz-bearing augite-hypersthene andesite...andesite porphyry.__________________ Augite andesite_-_-_-_-_-_-___-_--_-______-_ Hypersthene andesi...and dacites from Saipan and volcanic rocks from Guam, the Palau Islands, and the Bonin Islands______ |  | | 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) | | University of Arizona, Tucson, Arizona, 85721, USA Abstract. Low-K rhyolites and overlying 2-pyroxene...of Saipan is one of a group of islands (including Guam, Tinian, Rota and several smaller islets) that represent...it has been studied (Saipan: Cloud et al. 1956; Guam: Tracey et al. 1963; Reagan and Meijer in press;...with predominantly basalts and andesites exposed on Guam (Tracey et al. 1963; Reagan and Meijer in press)...rock types in the Hagman Formarion are augite andesite and augite-hypersthene andesite (Cloud et al. 1956) |  | | Journal (article/letter/editorial) | | olivine-hypersthene-augite andesite,Chokaivolcano (Onuma,1963b), 6. olivinebg. hornblende-hypersthene-augite andesite...The Sakamoto basalt is olivine basalt, olivine-augite basalt, or aphyric basalt and contains olivine...olivine-hypersthene-augite andesite , Chokai volcano,8 hornblende-bg. olivine-hypersthene-augite andesite , Chokai...olivine-hypersthene-augite andesite , Chokai volcano, olivine-bg. hornblende-hypersthene-augite andesite , Chokai...hornblende-hypersthene-augite andesite , Chokai volcano, olivine-bg. hornblende-hypersthene-augite andesite , Chokai |  | | Journal (article/letter/editorial) | | earth element abundances in volcanic rocks from Guam: implications for the evolution of the Mariana Arc...33199, USA 2 Earth Science Board, University of California at Santa Cruz, Santa Cruz, CA 95064, USA Abstract...Abstract. Volcanic rocks exposed on Guam were erupted during the Late Middle Eocene (Facpi Fm.), Late...element (REE) data for volcanic rocks from Guam Island. Guam is the southernmost island in the Mariana...erupted between 44 and 14 m.y.b.p. The oldest lavas on Guam are the oldest dated rocks in the Mariana arc system |  | | Report (issue) | | are found in the eastern islands. Plagioclase, augite, and olivine are commonly recognizable as phenocrysts...and alteration to limonitic clay. Plagioclase, augite, and magnetite are unaltered in most specimens...percent. It is monoclinic and ranges from colorless augite, with maximum extinction angles (CAZ) between 39°...shades of violet and reddish tan, in varieties of augite rich in titanium. The titaniferous augites are...typical specimen is 1.695. These data indicate an augite having the composition of Wo45, En2i Fs34 (tables |  | | Report (issue) | | Marine Geology of Guam GEOLOGICAL SURVEY PROFESSIONAL PAPER 403-B Marine Geology of Guam By K. O. EMERY...EMERY GEOLOGY AND HYDROLOGY OF GUAM, MARIANA ISLANDS GEOLOGICAL SURVEY PROFESSIONAL PAPER 403-B A study...-_-_------------------5 3. Bathymetric chart of Guam and vicinity._________________________-______--...--10 8. Distribution of deep-sea sediments near Guam, compiled from various sources_-__--------_-----------------12... 13. 14. Description of samples from slopes of Guam.____________________________________________________________ |  | | Journal (article/letter/editorial) | | erupted after boninites) from the Bonin Islands and Guam. The age-corrected (initial) Os isotope ratios of...from the Bonin Islands (0.1187–0.1254) and from Guam (0.1220–0.1269) are unradiogenic relative to primitive...olivine, augite, and plagioclase. Cr-spinel and magnetite occurred as inclusions in olivine and augite phenocrysts...Mukoujima CE P 2.2 Samples from Guam TE D (Maehara and Maeda, 2004). Guam, an island at the southern end...volcanics near Guam erupted around 45 Ma (Reagan et al., 2008). All of the samples from Guam (GM-1, GM-6 |  | | Journal (article/letter/editorial) | | microphenocrysts (Mg# = 0.86– 0.89, Wo2.6–4.9 En82–86 ) with augite (with or without pigeonite overgrowth) (Mg# = 0...zeolite and clay minerals, euhedral to subhedral augite (Mg# = 0.82–0.90, Wo41–43 En48–53 ) with oscillatory...inclusions in olivine. A peculiar zoning relationship of augite and enstatite demonstrates that some pyroxenes...abundant elongate enstatite microphenocrysts with augite rims (plane polarized light). (b) Characteristic...spinel, olivine, clinoenstatite, enstatite and augite. The HSB differentiation series is best exemplified |  | | Journal (article/letter/editorial) | | sparsely phyric with phenocrystic plagioclase, augite, hypersthene, pigeonite, and Fe-Ti oxides (mostly... and (c) cristobalite by its shrinkage cracks. Augite and plagioclase are common phenocrysts throughout...plagioclase + augite + magnetite, plagioclase + augite + hypersthene + magnetite, plagioclase + augite + ferriferous...pigeonite + hypersthene + magnetite, plagioclase + augite + hypersthene + ilmenite; (2) dacites and rhyodacites:...ilmenite, plagioclase + augite + intermediate pigeonite + magnetite, plagioclase + augite + ferroaugite + magnesian |  | | Journal (article/letter/editorial) | | terminated needles. The clinopyroxene is augite or diopsidic augite, and is found as poorly zoned, rarely...Volcano (Kuno, 1962). (4) Sodic—Andesite Boulder from Guam (Stark, 1963). (5) Pumice from Huzi Volcano (Kuno...J. T., 1963, Petrology of the volcanic rocks of Guam, U.S. Geol. Survey Prof. Paper 403-C, 32 p. MANUSCRIPT | | | Journal (article/letter/editorial) | | stricto) enclosed in the magnesian olivine and augite phenocrysts to titaniferous magnetite in the groundmass... (32 oxygen basis) of spinels in a A=in from augite. total G=in iron groundmass. assuming ideal...tholeiitic basalt of Guam (solid circles; Shiraki et al., 1977), calc-alkalic basalt of Guam (open circles;...circles), tholeiitic and calc-alkalic basalts of Guam (solid circles; Shiraki et al., 1977), boninite...白木 3. Electron olivine spinel microprobe and augite 敬 一 ・大橋 不 三 男 ・黒 田 analyses with of chrome |  | | Journal (article/letter/editorial) | | original rock-forming minerals, such as hypersthene, augite, biotite, and even titaniferous magnetite, with...deeps are usually about 10 miles wide, exceptingthe Guam deep, which is as much as 20 across. The most interesting...are usually about 10 miles wide, excepeting the Guam deep, which is as much as 20 across. The most interesting |  | | Journal (article/letter/editorial) | | in the first part of the cruise between Tokyo and Guam and publish their results. A full geological compilation...Parece ~ Vela Basin ESE - Ridge Mariana Trough ~ | Guam (12°N) 1404 1403 1402 km L.. ~,:~:.-,~ ,, ~o...sedimentary records from the volcanic islands of Saipan, Guam and Palau, the volcanic activity started at least...investigated [16]: the more central part southeast of Guam (stations 1402-1404) and the western end at the...quenched microphenocrysts of enstatite, pigeonite and augite. Optically fresh glass contains up to 3 wt.% K20 |  | | Journal (article/letter/editorial) | | and weathered intermediate to basic igneous rocks, Guam! Interface limestone and weathered volcanic rock...minor constituents and consist mostly of aegirine-augite. The fabric of phonolite associated with bauxite...Agt, Pct and Ntr. Mineral ymbol : Agt=aegirine-augite; Anl=Analcime; Ant=anara e; Bhm=boehmite; Gbs=gibbsite;...or with diagenetic phases (Rio Blanco, Colorado, USA and Sydney Basin, Australia). For both origins, nordstrandite...C. and Schlanger, S.O. (1962) Nordstrandite from Guam. Nature, 196, 265-266. Hemingway, B.S. (1982) Gibbs |  | Reagan, Mark K., Heaton, Daniel E., Schmitz, Mark D., Pearce, Julian A., Shervais, John W., Koppers, Anthony A.P. (2019) Forearc ages reveal extensive short-lived and rapid seafloor spreading following subduction initiation. Earth and Planetary Science Letters, 506. 520-529 doi:10.1016/j.epsl.2018.11.020 | Journal (article/letter/editorial) | | of Iowa, Iowa City, IA, USA CEOAS, Oregon State University, Corvallis, OR, USA c Department of Geosciences...Geosciences, Boise State University, Boise, ID, USA d School of Earth and Ocean Sciences, Cardiff University...Department of Geology, Utah State University, Logan, UT, USA b a r t i c l e i n f o Article history: Received...Sciences, University of Iowa, Iowa City, IA 52242, USA. E-mail addresses: mark-reagan@uiowa.edu (M.K. Reagan)...Planetary Science Letters 506 (2019) 520–529 rare augite or plagioclase phenocrysts. Groundmasses are glassy |  | | Journal (article/letter/editorial) | | College Station, Duke University, Durham, NC 27708, USA 2 Geological Research Division, A-0t5, Scripps Institution...Institution of Oceanography, La Jolla, CA 92093, USA Abstract. Boninite series volcanic rocks have been...Mendeleev dredge 1403. S indicates location of Saipan, G Guam 14 5~ dacite series ( B l o o m e r et al. 1979;...andesite.., with phenocrysts of olivine, bronzite and augite" (Peterson 1891) from Chichi-jima in the Bonin...50 The calcic pyroxene phenocrysts are mostly augite, with lower Cr203 and higher A1203 than the coexisting | | | Journal (article/letter/editorial) | | from 2. Olivine-bearing hornblende-hypersthene-augite andesite, Chokai volcano (Nagao et al., 1980)....and subordinate olivine set in a groundmass of augite, plagioclase, and altered fine-grained material...Mariana 29 abstract). •\ 357-362. Nagao, (1977), Guam, pressures. Year spinel" Japan, origin and |  | | Report (chapter) | | at Dallas, Box 830688, Richardson, TX 75083-0688, USA 2 Institute for Research on Earth Evolution (IFREE)...OR 97331, USA 5 Pacific Marine Environmental Laboratory/NOAA, Newport, OR 97365-5258, USA 6 ALS Geochemistry...Sciences, University of Delaware, Newark, DE 19716, USA *Corresponding author (e-mail: rjstern@utdallas.edu)...2800 km south from near Tokyo, Japan, to beyond Guam, USA (Fig. 1a), and is an excellent example of an intra-oceanic...indicate relatively low temperatures of c. 800 8C. Augite in sample 1012R07 scatter because some may have |
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