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Friday, July 31, 2020 | History

2 edition of tops of porphyry copper deposits - mineralization and plutonism in the Western Cascades, Oregon found in the catalog.

tops of porphyry copper deposits - mineralization and plutonism in the Western Cascades, Oregon

Sara Glen Power

tops of porphyry copper deposits - mineralization and plutonism in the Western Cascades, Oregon

by Sara Glen Power

  • 115 Want to read
  • 26 Currently reading

Published .
Written in English

    Subjects:
  • Copper ores -- Oregon.

  • Edition Notes

    Statementby Sara Glen Power.
    The Physical Object
    Pagination[15], 234 leaves, bound :
    Number of Pages234
    ID Numbers
    Open LibraryOL14265631M

    Porphyry copper deposits - Grades, sulfides, alteration. Six million tons of copper are contained in three porphyry copper deposits: million tons (mt) of % Cu in the Yerington mine; mt of wt % Cu and ~ wt % Mo in the Ann Mason deposit; and > mt of wt % Cu in the Bear-Lagomarsino deposit. A note on the origin of Bull Run and Lost Lakes, Western Cascades, Oregon, v. 51, n. 3 p. 60 Cascades Western, glaciation Darden, C.F. Geophysical exploration for petroleum, v. 51, n. 3 p. 61 Miocene sandstone Gravity base stations gravity methods gravity values fluvial features rivers types v. 26, n. 4, p. 72 Hellgate Canyon origin Rogue River.

    Power, S.G., , The “tops” of porphyry copper deposits—Mineralization and plutonism in the western Cascades, Oregon: Corvallis, Oregon State University, Ph.D. thesis, p. Cyril Chelle-Michou, Massimo Chiaradia, Amphibole and apatite insights into the evolution and mass balance of Cl and S in magmas associated with porphyry copper deposits, Contributions to Mineralogy and Petrology, /s, , , ().

    the Porphyry Copper Deposits: Southwestern North America PAGE 85 S. R. Titley (Ed.), The University of Arizona Press, Tucson, xiv + pp., , $ Reviewed by Stephen E. Kesler This book summarizes recent advances in information on the porphyry copper deposits of southwestern North America. It is a sequel. porphyry copper deposit, western Yunnan, SW-China. These tex-tures provide evidence, which suggests that crystallization of chal-copyrite mineral from a chalcopyrite–silica melt—an important compound in ore-forming fluids from porphyry copper deposits— was caused by volume expansion. Volume expansion can poten-.


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Tops of porphyry copper deposits - mineralization and plutonism in the Western Cascades, Oregon by Sara Glen Power Download PDF EPUB FB2

The "tops" of porphyry copper deposits - mineralization and plutonism in the Western Cascades, OregonCited by: The HTopsu of Porphyry Copper Deposits Mineralization and Plutonism in the Western Cascades, Oregon by Sara Glen Power A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy Completed Septem.

: Geology of the Porphyry Copper Deposits of the Western Hemisphere (): Hollister, Victor F.: BooksCited by: porphyry deposits.

All these studies clearly show that past subduction history and, in particular, the convergence parameters have to be accounted for when genesis of porphyry Cu deposits is studied. To identify relationships between mineralization and geodynamic processes, it is, thus,Cited by: K–Ar dating demonstrates that all but eight of 41 dated porphyry copper and related ore deposits of Mexico were emplaced during the Laramide episode of maximum plate convergence.

One older deposit is related to the Jurassic volcanic arc of western North America, one is pre-Laramide Cretaceous, four are Oligocene in age, and two late Cenozoic Cited by: Copper is a moderately incompatible chalcophile element. Its behavior is strongly controlled by sulfides.

The speciation of sulfur is controlled by oxygen fugacity. Therefore, porphyry Cu deposits are usually oxidized (with oxygen fugacities > ΔFMQ +2) (Mungall ; Sun et al. The problem is that while most of the magmas at convergent margins are highly oxidized, porphyry Cu deposits. The location of the mineralized structures at the intersections of fault systems with different trends (E–W and NW–SE, occasionally WNW–ESE), the superposition of vein meshes on the porphyry copper structures and the geometry of deposits outline the control of tensional strain on the mineralization (Drew,Neubauer et al., ).

Porphyry Copper Deposits Over one half of the world's copper production is currently derived from porphyry copper deposits, large tonnage (commonly exceeding m tons), low grade, roughly equidimensional deposits of dis- seminated and stockwork-veinlet, pyrite-chalcopyrite mineralization, carrying at least trace amounts of.

Understanding Geology of Porphyry Copper Deposits and formations using models around the World. Porphyry Copper Deposits are the largest source of Cu/Mo/Au. Chapter B of Mineral Deposit Models for Resource Assessment. This report contains a revised descriptive model of porphyry copper deposits (PCDs), the world’s largest source (about 60 percent) and resource (about 65 percent) of copper and a major source of molybdenum, gold and silver.

Despite relatively low grades (average percent copper. Porphyry ore deposits typically form in convergent plate margin or postsubduction settings at depths of km. Oxidized hydrous melts derived from the metasomatized mantle wedge transport Cu, Au.

Vol. T, Porphyry Copper Deposits in the American Southwest: Tucson to Globe-Miami, Arizona July19–23, Vol. T, Cordilleran Volcanism, Plutonism, and Magma Generation at Various Crustal Levels, Montana and Idaho Western Montana and Central Idaho.

The "tops" of porphyry copper deposits - mineralization and plutonism in the Western Cascades, Oregon / low-grade porphyry copper deposits in the northern third of the ancestral Cascades arc. Porphyry copper deposits (PCDs) represent shallow level intrusions (2–5 km) in the crust.

Mineralization of Cu ores tend to occur at the tops of porphyry systems in cupolas. Possible regimes where Cu may be mobilized include hydrothermal circulation at mid-ocean ridge centers, dehydration or melting of the subducting slab, and late stage. Only few porphyry copper deposits or occurences have been found with an age of more than million years.

One of the youngest is the Ok Tedi deposit in Papua Newguinea being approx. million years of age. Currently, new porphyry copper deposits are formed somewhere in the world beneath active volcanic territory.

Size & Grades. Power, S. G.: The tops of porphyry copper deposits — mineralization and plutonism in the Western Cascades, Oregon. Ph.D. dissertation, Oregon State University, Corvallis, Oregon (). The potential for porphyry copper-molybdenum deposits in the Eastern United States. (Geology and resources of copper deposits) (Geological Survey professional paper.

The 14 mines represent 87% (14 out of 16) of currently operating copper porphyry mines, and 89% of U.S. copper production in – the most recent data on copper production available from the U.S. Geological Survey. The mines were chosen based on. ), represents one of the few porphyry Cu(-Au-Mo) deposits, a distinctive family of porphyry deposits that are commonly associated with relatively mafic intrusive rocks (Seedorff et al., ), that has been documented to date.

The spatial and temporal association of Dos Pobres with comparatively Au-poor porphyry Cu-Mo deposits in the. Large-Scale Copper Target – (ownership % FMN) Porphyritic copper mineralization identified at two key mineralized zones approximately 4,m apart.

Historical sampling at the project indicates peak mineralization grades of: between % - % Cu at the Upper Zone. and higher grades of >1% Cu at the Lower Zone. Porphyry copper deposit, large body of rock, typically a porphyry of granitic to dioritic composition, that has been fractured on a fine scale and through which chalcopyrite and other copper minerals are ry copper deposits commonly contain hundreds of millions of metric tons of ore that averages a fraction of 1 percent copper by weight; although they are low-grade, the.well as the associated mineral deposits (Popov et al.

b). Over ore deposits, ore occurrences and mineral manifestations have been established in the Panagyurishte ore district. It is characterized mainly by porphyry copper and massive sulfide copper deposits. Small gold-ore, gold-polymetallic, barite, lead-zinc and.), while porphyry Mo deposits are associated within more siliceous quartz monzonite and alkali granite intrusions (White et al., ), commonly in regions characterised by a greater input of continental crust.

In the SW Pacific porphyry Cu-Au deposits occur within now.