Revenge of Hump Day 2017-09-13
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Geologic Map of the Central San Juan Caldera Cluster, Southwestern Colorado by Peter W
Geologic Map of the Central San Juan Caldera Cluster, Southwestern Colorado By Peter W. Lipman Pamphlet to accompany Geologic Investigations Series I–2799 dacite Ceobolla Creek Tuff Nelson Mountain Tuff, rhyolite Rat Creek Tuff, dacite Cebolla Creek Tuff Rat Creek Tuff, rhyolite Wheeler Geologic Monument (Half Moon Pass quadrangle) provides exceptional exposures of three outflow tuff sheets erupted from the San Luis caldera complex. Lowest sheet is Rat Creek Tuff, which is nonwelded throughout but grades upward from light-tan rhyolite (~74% SiO2) into pale brown dacite (~66% SiO2) that contains sparse dark-brown andesitic scoria. Distinctive hornblende-rich middle Cebolla Creek Tuff contains basal surge beds, overlain by vitrophyre of uniform mafic dacite that becomes less welded upward. Uppermost Nelson Mountain Tuff consists of nonwelded to weakly welded, crystal-poor rhyolite, which grades upward to a densely welded caprock of crystal-rich dacite (~68% SiO2). White arrows show contacts between outflow units. 2006 U.S. Department of the Interior U.S. Geological Survey CONTENTS Geologic setting . 1 Volcanism . 1 Structure . 2 Methods of study . 3 Description of map units . 4 Surficial deposits . 4 Glacial deposits . 4 Postcaldera volcanic rocks . 4 Hinsdale Formation . 4 Los Pinos Formation . 5 Oligocene volcanic rocks . 5 Rocks of the Creede Caldera cycle . 5 Creede Formation . 5 Fisher Dacite . 5 Snowshoe Mountain Tuff . 6 Rocks of the San Luis caldera complex . 7 Rocks of the Nelson Mountain caldera cycle . 7 Rocks of the Cebolla Creek caldera cycle . 9 Rocks of the Rat Creek caldera cycle . 10 Lava flows premonitory(?) to San Luis caldera complex . .11 Rocks of the South River caldera cycle . -
(2000), Voluminous Lava-Like Precursor to a Major Ash-Flow
Journal of Volcanology and Geothermal Research 98 (2000) 153–171 www.elsevier.nl/locate/jvolgeores Voluminous lava-like precursor to a major ash-flow tuff: low-column pyroclastic eruption of the Pagosa Peak Dacite, San Juan volcanic field, Colorado O. Bachmanna,*, M.A. Dungana, P.W. Lipmanb aSection des Sciences de la Terre de l’Universite´ de Gene`ve, 13, Rue des Maraıˆchers, 1211 Geneva 4, Switzerland bUS Geological Survey, 345 Middlefield Rd, Menlo Park, CA, USA Received 26 May 1999; received in revised form 8 November 1999; accepted 8 November 1999 Abstract The Pagosa Peak Dacite is an unusual pyroclastic deposit that immediately predated eruption of the enormous Fish Canyon Tuff (ϳ5000 km3) from the La Garita caldera at 28 Ma. The Pagosa Peak Dacite is thick (to 1 km), voluminous (Ͼ200 km3), and has a high aspect ratio (1:50) similar to those of silicic lava flows. It contains a high proportion (40–60%) of juvenile clasts (to 3–4 m) emplaced as viscous magma that was less vesiculated than typical pumice. Accidental lithic fragments are absent above the basal 5–10% of the unit. Thick densely welded proximal deposits flowed rheomorphically due to gravitational spreading, despite the very high viscosity of the crystal-rich magma, resulting in a macroscopic appearance similar to flow- layered silicic lava. Although it is a separate depositional unit, the Pagosa Peak Dacite is indistinguishable from the overlying Fish Canyon Tuff in bulk-rock chemistry, phenocryst compositions, and 40Ar/39Ar age. The unusual characteristics of this deposit are interpreted as consequences of eruption by low-column pyroclastic fountaining and lateral transport as dense, poorly inflated pyroclastic flows. -
Ignimbrites to Batholiths Ignimbrites to Batholiths: Integrating Perspectives from Geological, Geophysical, and Geochronological Data
Ignimbrites to batholiths Ignimbrites to batholiths: Integrating perspectives from geological, geophysical, and geochronological data Peter W. Lipman1,* and Olivier Bachmann2 1U.S. Geological Survey, Mail Stop 910, Menlo Park, California 94028, USA 2Institute of Geochemistry and Petrology, ETH Zurich, CH-8092 Zürich, Switzerland ABSTRACT related intrusions cooled and solidified soon shorter. Magma-supply estimates (from ages after zircon crystallization, as magma sup- and volcano-plutonic volumes) yield focused Multistage histories of incremental accu- ply waned. Some researchers interpret these intrusion-assembly rates sufficient to gener- mulation, fractionation, and solidification results as recording pluton assembly in small ate ignimbrite-scale volumes of eruptible during construction of large subvolcanic increments that crystallized rapidly, leading magma, based on published thermal models. magma bodies that remained sufficiently to temporal disconnects between ignimbrite Mid-Tertiary processes of batholith assembly liquid to erupt are recorded by Tertiary eruption and intrusion growth. Alternatively, associated with the SRMVF caused drastic ignimbrites, source calderas, and granitoid crystallization ages of the granitic rocks chemical and physical reconstruction of the intrusions associated with large gravity lows are here inferred to record late solidifica- entire lithosphere, probably accompanied by at the Southern Rocky Mountain volcanic tion, after protracted open-system evolution asthenospheric input. field (SRMVF). Geophysical -
40Ar/39Ar Dating of the Late Cretaceous Jonathan Gaylor
40Ar/39Ar Dating of the Late Cretaceous Jonathan Gaylor To cite this version: Jonathan Gaylor. 40Ar/39Ar Dating of the Late Cretaceous. Earth Sciences. Université Paris Sud - Paris XI, 2013. English. NNT : 2013PA112124. tel-01017165 HAL Id: tel-01017165 https://tel.archives-ouvertes.fr/tel-01017165 Submitted on 2 Jul 2014 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Université Paris Sud 11 UFR des Sciences d’Orsay École Doctorale 534 MIPEGE, Laboratoire IDES Sciences de la Terre 40Ar/39Ar Dating of the Late Cretaceous Thèse de Doctorat Présentée et soutenue publiquement par Jonathan GAYLOR Le 11 juillet 2013 devant le jury compose de: Directeur de thèse: Xavier Quidelleur, Professeur, Université Paris Sud (France) Rapporteurs: Sarah Sherlock, Senoir Researcher, Open University (Grande-Bretagne) Bruno Galbrun, DR CNRS, Université Pierre et Marie Curie (France) Examinateurs: Klaudia Kuiper, Researcher, Vrije Universiteit Amsterdam (Pays-Bas) Maurice Pagel, Professeur, Université Paris Sud (France) - 2 - - 3 - Acknowledgements I would like to begin by thanking my supervisor Xavier Quidelleur without whom I would not have finished, with special thanks on the endless encouragement and patience, all the way through my PhD! Thank you all at GTSnext, especially to the directors Klaudia Kuiper, Jan Wijbrans and Frits Hilgen for creating such a great project. -
Geophysical Study of the San Juan Mountains Batholith Complex, Southwestern Colorado
Geophysical study of the San Juan Mountains batholith complex, southwestern Colorado Benjamin J. Drenth1,*, G. Randy Keller1, and Ren A. Thompson2 1ConocoPhillips School of Geology and Geophysics, 100 E. Boyd Street, University of Oklahoma, Norman, Oklahoma 73019, USA 2U.S. Geological Survey, MS 980, Federal Center, Denver, Colorado 80225, USA ABSTRACT contrast of the complex. Models show that coincident with the San Juan Mountains (Fig. 3). the thickness of the batholith complex var- This anomaly has been interpreted as the mani- One of the largest and most pronounced ies laterally to a signifi cant degree, with the festation of a low-density, upper crustal granitic gravity lows over North America is over the greatest thickness (~20 km) under the west- batholith complex that represents the plutonic rugged San Juan Mountains of southwest- ern SJVF, and lesser thicknesses (<10 km) roots of the SJVF (Plouff and Pakiser , 1972). ern Colorado (USA). The mountain range is under the eastern SJVF. The largest group of Whereas this interpretation remains essentially coincident with the San Juan volcanic fi eld nested calderas on the surface of the SJVF, unchallenged, new gravity data processing tech- (SJVF), the largest erosional remnant of a the central caldera cluster, is not correlated niques, digital elevation data, and constraints widespread mid-Cenozoic volcanic fi eld that with the thickest part of the batholith com- from seismic refraction studies (Prodehl and spanned much of the southern Rocky Moun- plex. This result is consistent with petrologic Pakiser , 1980) enable reassessment and improve- tains. A buried, low-density silicic batholith interpretations from recent studies that the ment of the previous model. -
Ionisphere 8
Ionisphere 8 December 2017 The official journalistic publication of the National Fantasy Fan Federation Fan-Pro Coordinating Bureau Last issue part of the cover text appeared on the first page rather than on the cover, although it was not sent out that way. I’ve tried to avoid that this issue by not having additional text on the cover. Please be aware that there are size adjustment options on your screen if the print is showing up too small, as it does for me in the efanzine edition. Back issues of this publication may be found in the annals of the National Fantasy Fan Federation at http://efanzines.com Io is the production of John Thiel, 30 N. 19th Street, Lafayette, Indiana 47904, issued on a bimonthly schedule to members of that organization and available generally at efanzines. BUREAU OFFICIALS John Thiel, Bureau Chief, [email protected] Jefferson Swycaffer, Pro Contact, [email protected] Jon Swartz, Fan Contact, [email protected] John Polselli, Ground Adjutant, 2801 Mayfair Ave., Henderson, Nevada 89074 We also have need of a news officer who has contacts for news about fan activities and events and science fiction events. We can present a person taking this position with one news source. Address this publication at the editor’s address Editorial The Future is Here; Are We? Taking things from the perspective of when I first entered science fiction fandom and was a reader of all the magazines and a good many fanzines, a time when I was discussing what the future might bring or be like with a lot of science fiction fans, based on our reading of future-predictive stories like BRAVE NEW WORLD and the editorials in magazines about the future, I see the years in which we are now living as the future about which we were then speculating, and am wondering how well we all like it and how much we have successfully adjusted to it. -
Penitente Canyon and Elephant Rock
Penitente Canyon and Elephant Rock Introduction: rocks resulting from this eruption were unusually uniform in composition. This would imply that the ash cooled as a single unit. This Penitente Canyon unit is known as the Fish Canyon Tuff. Many The canyon itself is part of the La Garita sections of the Fish Canyon Tuff are over 4,000 Caldera, a volcanic eruption that occurred in the feet thick. The area at Elephant Rocks is mainly San Juan Mountains about 26-28 million years grassland with scattered massive boulders laid ago. It is said to be the largest known explosive out. It is also habitat to the rock loving eruption in the Earth’s history, sending ash as far Neoparrya, which flourishes in igneous outcrops off as the U.S. Eastern Seaboard. The resulting or sedimentary rocks from volcanic eruptions. deposit is called Fish Canyon Tuff, which is The Neoparrya is native to the San Luis Valley volcanic ash molded together, according to and is known to exist only here and in the Wet Colville. The resulting geological formations are Mountain Valley regions. The Fish Canyon Tuff ideal for the sport of rock climbing. makes up the Elephant Rocks and gradually The La Garita Mountains are a sub-range of erodes over time to provide the proper soil the San Juans in southwest Colorado and chemistry and growth conditions in order for comprising parts of the Rio Grande and the this plant to thrive. The recreation area is 378 Gunnison National Forests. This lesser known acres with an elevation of 7,900 feet managed wilderness area in Colorado is actually one by the Bureau of Land Management. -
2017 Briefing Book Colorado Table of Contents Colorado Facts
U.S. Department of the Interior Bureau of Land Management 2017 Briefing Book Colorado Table of Contents Colorado Facts .......................................................................................................................................................................................... 1 Colorado Economic Contributions ..................................................................................................................................................... 2 History .................................................................................................................................................................................................. 3 Organizational Chart ........................................................................................................................................................................... 4 Branch Chiefs & Program Leads ........................................................................................................................................................ 5 Office Map ............................................................................................................................................................................................ 6 Colorado State Office ................................................................................................................................................................................ 7 Leadership ......................................................................................................................................................................................... -
Pollen Evidence of Floristic Turnover Forced by Cool Aridity During the Oligocene in Colorado GEOSPHERE; V
Research Paper GEOSPHERE Pollen evidence of floristic turnover forced by cool aridity during the Oligocene in Colorado GEOSPHERE; v. 15, no. 1 Estella B. Leopold and Stephanie Zaborac-Reed University of Washington, Department of Biology, Box 351800, Seattle, Washington 98195, USA https://doi.org/10.1130/GES01689.1 7 figures; 6 plates; 11 tables; ABSTRACT Manchester, 1997). In Colorado, the EOT is associated with a period of cooling 1 set of supplemental files and severe aridity lasting most of the Oligocene. One of our strongest contri- New pollen data from four Oligocene floras in volcanic landscapes of Colo butions is the addition of the pollen record from four Oligocene floras, which CORRESPONDENCE: eleopold@ uw.edu rado record important climatic shifts that reshaped the local flora and promoted had not been reported previously. This pollen record is an important aspect the development of subarid vegetation types. We combined new pollen data of this paper for assessing the total flora. The emphasis of this study is on the CITATION: Leopold, E.B., and Zaborac-Reed, S., 2019, Pollen evidence of floristic turnover forced by with previous megafossil evidence to assess vegetation changes during the evolutionary and climatic significance of the floristic changes during the EOT. cool aridity during the Oligocene in Colorado: Geo- Eocene–Oligocene Transition (EOT). Pollen data are the basis for updating Five Colorado floras of late Eocene through Oligocene age lie within the sphere, v. 15, no. 1, p. 254–294, https:// doi .org /10 the list of flora identified at Creede. Local extinctions in response to lower sum geographic mix of caldera and volcanic settings in the central Colorado vol- .1130 /GES01689.1. -
USGS Scientific Investigations Map 3394 Pamphlet
Geologic Map of the Bonanza Caldera Area, Northeastern San Juan Mountains, Colorado By Peter W. Lipman Pamphlet to accompany Scientific Investigations Map 3394 WEST CALDERA RIM Windy Point Antora Peak Sheep Mountain Inner caldera wall Soutwest flank, resurgent dome LT AU F NG RI n) K tio E oca RE x. l C pro ER (ap RB KE 2020 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior DAVID BERNHARDT, Secretary U.S. Geological Survey James F. Reilly II, Director U.S. Geological Survey, Reston, Virginia: 2020 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment—visit https://www.usgs.gov or call 1–888–ASK–USGS. For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Suggested citation: Lipman, P.W., 2020, Geologic map of the Bonanza caldera area, northeastern San Juan Mountains, Colorado: U.S. Geological Survey Scientific Investigations Map 3394, 73 p., 2 sheets, scale 1:50,000, https://doi.org/10.3133/ sim3394. Associated data for this publication: Robinson, J.E., and Lipman, P.W., 2020, Database for the geologic map of the Bonanza caldera area, northeastern San Juan Mountains, Colorado: U.S. -
If We Con, Then You Con Too! Need No Steenking You Survived Registration - So Accompanying Piece, “Badges?”) Badges
The Newszine of ConAdian, the 54th World Science Fiction Convention. Sept 1, 1994 Badges? We Don't If we Con, then You Con Too! Need no Steenking You survived registration - so accompanying piece, “Badges?”) Badges.... now what do you do? Once you get your registration By Ross Pavlac materials, you should do what Tips on how to survive registration few fans do: sit down quietly for and get on with the Con. You have had the wisdom and fifteen minutes or so and by Catherine Donahue skill to find one of the distribu take time to look through the tion points for this newsletter, or program book. Nowadays, Wednesday evening, after 1400 you know someone who has. most fans dump it in the suitcase of an expected 3800 attendees Great! The Voyageur is here to and don’t look at it ’till weeks or had been registered, The keep you informed of what is months later. Voyageur surveyed the volun happening at the convention. But there may be information teers at the Registration Area to This will be one of your key that is important to you. Publish dig up hot tips to help those not sources of information on Hos ers can use this to announce already Badged to make it pitality Function locations (the major new titles; Worldcon bids through the ritual of registration things that, in a kinder, gentler (more on this later) publish their with a minimum of hair loss. world used to be called parties), most important ads here, etc. last minute program changes, Take a quick flip through to see For Pre-registered Individuals award listings, urgent committee (continued next page) Tip Number One: Cast your announcements, fasci mind back, way back, to your nating and amusing place of work or residence. -
Lan's Lantern 33
Copyright © 1989 by Teddy H<arvi«a Contends Front Cover.............................................................................Teddy Harvia Table of Contents & Artists, Colophon.............................................. 1 Heinlein and the Editor..........................................Lan.......................... 2 All fly Gurus Are Dead.......................... by James Wallace Harris...3 Some Thoughts on the Death of Robert A. Heinlein................. by Brian Youmans...8 Robert A. Heinlein................................................by Jay Sullivan...9 A Voyage Is Over........................................................ by Leo Morris..10 A Giant.....................................................................by Terry O'Brien..10 Thoughts on Robert A. Heinlein....................... by T. D. Sadler..ll A Critical Personal Inventory of Robert A. Heinlein........... by John Thiel..12 Robert A. Heinlein: Master Storyteller..................................... by Elizabeth Osborne..14 ...But I Read Him Anyway............................by Sandra M. Taylor..15 A Call to Space....................................................by Susan Shwartz..18 Table of Artists Requiem: The Day That SF Died....................... by Arlan Andrews..20 Heinlein's Legacy..................................................by Jamin Meyers..22 P.L. Caruthers-Montgomery (Calligraphy)— The Predictions of Robert A. Heinlein...............by Joe Green..24 2, 3, 8, 9, 10,11, 12, 14, 15, 18, Robert A. Heinlein: A Chronology...............by Robert