Publications
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Ore-forming adakitic porphyry produced by fractional crystallization of oxidized basaltic magmas in a subcrustal chamber (Jiamate, East Junggar, NW China) Ore-forming adakitic porphyry produced by fractional crystallization of oxidized basaltic magmas in a subcrustal chamber (Jiamate, East Junggar, NW China)
Adakitic intrusions are supposed to have a close genetic and spatial relationship to porphyry Cu deposits. However, the genesis of adakitic intrusions is still under dispute. Here, we describe newly discovered intrusive complex rocks, which are composed of ore-bearing, layered magnetite-bearing gabbroic and adakitic rocks in Jiamate, East Junggar, NW China. These Jiamate Complex...
Authors
Tao Hong, Xing-Wang Xu, Jungang Gao, Stephen Peters, Di Zhang, Reyaniguli Jielili, Peng Xiang, Hao Li, Chu Wu, Jun You, Jie Liu, Qiang Ke
Natural inquirer: The citizen science edition Natural inquirer: The citizen science edition
People across the world are helping scientists collect data to answer important research questions. Learn how citizens are getting involved in science, from counting birds and lionfish to reporting earthquakes. All Over the Map, Citizen Science System, Device-ive Science, Invasion of the Song Snatcher, and Lion In Wait.
Authors
Shonte Jenkins
The late Cenozoic Eastern California Shear Zone after 25 years of study The late Cenozoic Eastern California Shear Zone after 25 years of study
No abstract available.
Authors
David M. Miller
Natural hazards and neotectonics Natural hazards and neotectonics
No abstract available.
Authors
Warren J. Nokleberg, David B. Stone
Mineralogical characterization of weathered outcrops as a tool for constraining water chemistry predictions during project planning Mineralogical characterization of weathered outcrops as a tool for constraining water chemistry predictions during project planning
Weathered samples from naturally exposed outcrops of troctolite associated with a magmatic Ni-Cu sulphide deposit were characterized by synchrotron-based micro-X-ray fluorescence mapping (µ-XRF) and X-ray absorption spectroscopy (XAS), as well as by lab-based X-ray diffraction, electron microscopy, Raman spectroscopy and wet chemical methods. Metal mobility in weathered samples was...
Authors
Tamara Diedrich, Paul Fix, Andrea L. Foster
Geologic sources of energy Geologic sources of energy
This chapter describes the exploration, development, and geologic setting of petroleum resources (including tar sands), coal resources (including coalbed methane), and geothermal energy resources of the Northern Cordillera.For petroleum resources, the chapter describes: (1) the history of petroleum development and production, first for Alaska and then for the Canadian Cordillera; and (2)
Authors
Thomas K. Bundtzen, Warren J. Nokleberg
Geochemical variations during development of the 5.46 Ma Broadwell Mesa basaltic volcanic field, California Geochemical variations during development of the 5.46 Ma Broadwell Mesa basaltic volcanic field, California
The 5.46±0.04 Ma Broadwell Mesa basalt and associated basaltic volcanic field in the western Bristol Mountains, California, formed a ~6 km2 volcanic flow field with architecture including numerous lava flows, a ~1.1 km2 lava lake, and a ~0.17 km2 cinder cone. The local number of lava flows varies from one along the margins of the field to as many as 18 that are stacked vertically...
Authors
David C. Buesch
Miocene−Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA Miocene−Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA
The Yakima fold province, located in the backarc of the Cascadia subduction zone, is a region of active strain accumulation and deformation distributed across a series of fault-cored folds. The geodetic network in central Washington has been used to interpret large-scale N-S shortening and westward-increasing strain; however, geodetic data are unable to resolve shortening rates across...
Authors
Lydia M. Staisch, Harvey Kelsey, Brian Sherrod, Andreas Moller, James B. Paces, Richard J. Blakely, Richard Styron
Connecting the Soda–Avawatz and Bristol–Granite Mountains faults with gravity andaeromagnetic data, Mojave Desert, California Connecting the Soda–Avawatz and Bristol–Granite Mountains faults with gravity andaeromagnetic data, Mojave Desert, California
The Soda–Avawatz and Bristol–Granite Mountains faults are considered by some to form the northeastern margin of the eastern California shear zone yet their connectivity and extents are obscured by surficial deposits and the estimates of total right-lateral offset from geologic data range from 0 to as much as 24 km. We use gravity and recently released detailed aeromagnetic data to map...
Authors
Victoria E. Langenheim, David M. Miller
Earth science atlas Earth science atlas
No abstract available.
Authors
Warren J. Nokleberg, Thomas K. Bundtzen, David W. Scholl, David B. Stone
Impact-related microspherules in Late Pleistocene Alaskan and Yukon “muck” deposits signify recurrent episodes of catastrophic emplacement 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...
Authors
Jonathan T. Hagstrum, Richard B. Firestone, Allen West, James C. Weaver, Ted E. Bunch