Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2354
Earth science atlas
No abstract available.
Authors
Warren J. Nokleberg, Thomas K. Bundtzen, David W. Scholl, David B. Stone
Cobalt—Styles of deposits and the search for primary deposits
Cobalt (Co) is a potentially critical mineral. The vast majority of cobalt is a byproduct of copper and (or) nickel production. Cobalt is increasingly used in magnets and rechargeable batteries. More than 50 percent of primary cobalt production is from the Central African Copperbelt. The Central African Copperbelt is the only sedimentary rock-hosted stratiform copper district that contains signifi
Authors
Murray W. Hitzman, Arthur A. Bookstrom, John F. Slack, Michael L. Zientek
Impact-related microspherules in Late Pleistocene Alaskan and Yukon “muck” deposits signify recurrent episodes of catastrophic emplacement
Large quantities of impact-related microspherules have been found in fine-grained sediments retained within seven out of nine, radiocarbon-dated, Late Pleistocene mammoth (Mammuthus primigenius) and bison (Bison priscus) skull fragments. The well-preserved fossils were recovered from frozen “muck” deposits (organic-rich silt) exposed within the Fairbanks and Klondike mining districts of Alaska, US
Authors
Jonathan T. Hagstrum, Richard B. Firestone, Allen West, James C. Weaver, Ted E. Bunch
Introduction to the 2008 Circum-Arctic Resource Appraisal (CARA) professional paper
The amount of yet-to-find oil and gas in the high northern latitudes is one of the great uncertainties of future energy supply. The possibility of extensive new petroleum developments in the Arctic Ocean is of interest to the Arctic nations, to petroleum companies, and to those concerned with the delicate and changing Arctic environment. The U.S. Geological Survey (USGS) 2008 Circum-Arctic Resourc
Authors
Donald L. Gautier, Thomas E. Moore
Regional geology and tectonics
This chapter describes the regional geology and tectonic origins of the major geologic units for the Northern Cordillera. The goals of the chapter are to: (1) provide a summary and regional overview of this vast region that contains a complicated geologic history; and (2) describe the major geologic units and tectonic events that cover a broad geologic time span from the Proterozoic to the Holocen
Authors
Warren J. Nokleberg
Geologic road guides for the Southern Canadian Cordillera--Viewing geology and tectonics along major highways
The Geologic Road Guides for the Southern Canadian Cordillera provide a layperson’s understanding of the major geologic units and their tectonic origins along portions of two sets of major highways corridors, herein termed the Southern Road Guide and the Northern Road Guide. The two routes are shown on the Southern Canadian Cordillera Geologic Map. The first page of each Road Guide is this map tha
Authors
Warren J. Nokleberg, Raymond A. Price
Landscapes and seascapes and tectonics
No abstract available.
Authors
Warren J. Nokleberg, David Scholl, Thomas K. Bundtzen, David B. Stone
Marine geology and tectonics--What is under all that water?
This chapter is divided into two main sections. The first section is on Marine Geology Seascapes (what earth scientists call bathymetry). The second section is on Tectonics of Marine Areas.
Authors
David W. Scholl, Warren J. Nokleberg
Fractional crystallization-induced variations in sulfides from the Noril’sk-Talnakh mining district (polar Siberia, Russia)
The distribution of platinum-group elements (PGE) within zoned magmatic ore bodies has been extensively studied and appears to be controlled by the partitioning behavior of the PGE during fractional crystallization of magmatic sulfide liquids. However, other chalcophile elements, especially TABS (Te, As, Bi, Sb, and Sn) have been neglected despite their critical role in forming platinum-group mine
Authors
C.J. Duran, S-J. Barnes, P. Pleše, M. Kudrna Prašek, Michael L. Zientek, P. Pagé
Networking our science to characterize the state, vulnerabilities, and management opportunities of soil organic matter
Soil organic matter (SOM) supports the Earth's ability to sustain terrestrial ecosystems, provide food and fiber, and retains the largest pool of actively cycling carbon. Over 75% of the soil organic carbon (SOC) in the top meter of soil is directly affected by human land use. Large land areas have lost SOC as a result of land use practices, yet there are compensatory opportunities to enhance prod
Authors
Jennifer W. Harden, Gustaf Hugelius, Anders Ahlström, Joseph C. Blankinship, Ben Bond-Lamberty, Corey Lawrence, Julie Loisel, Avni Malhotra, Robert B. Jackson, Stephen M. Ogle, Claire Phillips, Rebecca Ryals, Katherine Todd-Brown, Rodrigo Vargas, Sintana E. Vergara, M. Francesca Cotrufo, Marco Keiluweit, Katherine Heckman, Susan E. Crow, Whendee L. Silver, Marcia DeLonge, Lucas E. Nave