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Montana Bear Trap corundum deposit

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Journal Article
Published: 01 December 2017
American Mineralogist (2017) 102 (12): 2521–2522.
... results to lower T and much lower f O 2 . This corroborates the possibility of precipitate formation during metamorphic cooling. Palke and Breeding (2017) interpret melt inclusions found in three alluvial corundum grains from Montana and Australia as being primary. The melt inclusions...
Journal Article
Journal: Geology
Published: 01 April 2005
Geology (2005) 33 (4): 249–252.
...Gaston Giuliani; Anthony E. Fallick; Virginie Garnier; Christian France-Lanord; Daniel Ohnenstetter; Dietmar Schwarz Abstract Oxygen isotopic compositions of rubies and sapphires from 106 deposits worldwide, as well as heated natural corundum, have been measured in this study. Artificially heated...
FIGURES
Journal Article
Published: 01 December 2022
American Mineralogist (2022) 107 (12): 2291–2306.
...Jianhua Liu; Shuyun Cao; Dingkui Zhou; Xiaowen Li; Yu Wu; Haobo Wang; Wenxuan Li Abstract Corundum is rarely found in situ within alkali syenites. A corundum-bearing syenite was found in the Yushishan rare metal deposits of the eastern section of the Altyn Tagh fault in the northeastern Tibetan...
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Journal Article
Published: 01 July 2017
American Mineralogist (2017) 102 (7): 1451–1461.
...-associated deposits of Rock Creek and Missouri River, Montana, U.S.A., and the Anakie gem fields of Queensland, Australia. Exsolution of rutile or other oxide inclusions occurs only when the corundum host is held at a temperature lower than that of the initial formation for an extended period of time...
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Series: Short Courses
Published: 01 January 2014
DOI: 10.3749/9780921294696.ch02
EISBN: 978-0-921294-69-6
... monchiquite (lamprophyre characterized by the abundance of phlogopite and brown amphibole, olivine, clinopyroxene, analcime), ouachitite (a variety of monchiquite) and diamond-bearing kimberlite. Fig. 2-10. Age correlation of Cenozoic gem corundum deposits with associated magmatic and tectonic events...
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Journal Article
Published: 30 September 2017
The Canadian Mineralogist (2017) 55 (5): 823–843.
...., Lasnier, B., & Fritsch E. (2004) . The Dusi (Garba Tula) sapphire deposit, Central Kenya – a unique Pan-African corundum-bearing monzonite . Journal of African Earth Sciences 38 , 401 – 410...
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Journal Article
Journal: Economic Geology
Published: 01 August 2023
Economic Geology (2023) 118 (5): 931.
... Cu ± Mo ± Au mineral deposits associated with shallowly emplaced arc-type granitoids typically in convergent tectonic settings. Sulfide mineralization is intimately related to quartz-bearing veins and hydrothermal wall-rock alteration ( Seedorff et al., 2005 ; Sillitoe, 2010 ). These deposits form...
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Journal Article
Published: 18 January 2024
The Canadian Journal of Mineralogy and Petrology (2024) 62 (1): 43–60.
... alluvial deposits in many continental regions ( Hughes 1997 ). East Australia, South Asia (Thailand, Cambodia, Laos, Vietnam), and China yield particularly productive gem corundum deposits ( Sutherland 1996 , Guo et al . 1996 and references therein). Madagascar is one of the most important ruby...
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Journal Article
Journal: Economic Geology
Published: 01 March 2008
Economic Geology (2008) 103 (2): 307–334.
...Brian G. Rusk; Mark H. Reed; John H. Dilles Abstract The porphyry Cu-Mo deposit in Butte, Montana, formed where magmatic hydrothermal fluids, introduced with injections of porphyrytic dikes, fractured and permeated the Butte Quartz Monzonite. These fluids formed a stockwork of quartz and quartz...
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Journal Article
Journal: Economic Geology
Published: 01 September 2013
Economic Geology (2013) 108 (6): 1379–1396.
... © 2013 Society of Economic Geologists. 2013 T he giant porphyry copper deposit in Butte, Montana, is one example of a magmatic-hydrothermal system where an overpressured water-rich magmatic volatile phase hydrofractured overlying granite, then surged through the fractures, forming...
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Journal Article
Journal: Economic Geology
Published: 01 January 2010
Economic Geology (2010) 105 (1): 43–68.
...-time-temperature evolution veins and ore deposition in the QMP-LP zone (Fig. 12 ). Bornite-chalcopyrite-bearing EDM halos represent the earliest sulfide-depositional event at Bingham. Similar veins at Butte, Montana, formed between 650° and 550°C during transient fluctuations between lithostatic...
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Journal Article
Published: 01 August 2020
American Mineralogist (2020) 105 (8): 1161–1174.
... phenocrysts, in itself is an intriguing problem ( Kohut and Nielsen 2003 ). Given the rarity of their occurrences, the origin of corundum in such anorthite-bearing basic rocks remains an elusive issue as comprehensive petrogenetic models that explain the physico-chemical conditions of the formation...
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Journal Article
Published: 01 August 2000
The Canadian Mineralogist (2000) 38 (4): 937–950.
.... F ig . 1. Regional geology and location of the Zenith deposit (arrow) and other Mo-skarn deposits (stars) visited, as modified after Quinn (1952) and Lumbers (1982) . The small, unlabeled stars indicate other Mo-bearing (± U) skarn occurrences (from Carter et al. 1980 ). The Zenith...
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Journal Article
Journal: Economic Geology
Published: 01 September 2020
Economic Geology (2020) 115 (6): 1267–1303.
... , Traps and ore-bearing intrusions in the Noril’sk region : Moscow , Gosgeoltekhizdat , 61 p. (in Russian). Gorbachev , N.S. , and Grinenko , L.N. , 1973 , Sulfur isotope composition of sulfides and sulphates of the Oktyabrsk sulfide deposit (Norilsk region) with connection to its...
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Journal Article
Published: 01 April 2008
American Mineralogist (2008) 93 (4): 676–684.
...-inclusion bearing, low-temperature feldspar. The magmatic water contents are less well-constrained. None of the “hydrous” minerals of the MI (kaersutite, Ti-biotite, or fluor-apatite) requires much dissolved water in the melt. Importantly, however, this does not imply low water contents of the trapped melt...
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Journal Article
Published: 01 June 2010
European Journal of Mineralogy (2010) 22 (3): 363–380.
.... , Claude , J.M. ( 1990 ): Geothermobarometry based on pyrrhotite composition and fluid inclusion studies. Applications to the scheelite-bearing deposit of Salau (Pyrenees, France) . Eur. J. Mineral ., 2 , 235 – 243 . Einaudi , M. , Meinert , L. , Newberry , R. ( 1981 ): Skarn...
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Journal Article
Journal: Economic Geology
Published: 01 May 2010
Economic Geology (2010) 105 (3): 655–667.
... in marine and lacustrine anoxic zones. Uranium transported as soluble uranyl in groundwater would be fixed in chemically reducing pockets of fluvial deposits ( Sanford, 1994 ). Such events of exceptional mineral mobilization may have delivered unusual enrichments to suitable traps. Prospecting...
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Journal Article
Published: 01 April 2014
Geochemical Perspectives (2014) 3 (1): 73–99.
... from MVT deposits was by Pinckney and Haffty (1970) for the Cave in Rock district, southern Illinois. These workers crushed FI-bearing quartz, fluorite and barite under vacuum and analysed the fluids by atomic absorption spectroscopy and found up to 1040 ppm Zn and up to 350 ppm Cu. Metal...
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Journal Article
Journal: Economic Geology
Published: 01 August 2007
Economic Geology (2007) 102 (5): 1013–1020.
... Pb-As–bearing eulytite from the Galechnoe deposit, eastern Yakutia— G.N. Gamyanin, N.S. Bortnikov, Yu.Ya. Zhdanov, N.V. Zayakina, A.V. Mokhov, S.K. Popova, and V.S. Suknev 300 First data on the Raman microspectrometry of ore-forming fluids of gold and uranium mineralizations in Aldan (Republic...
Journal Article
Journal: Economic Geology
Published: 01 May 2005
Economic Geology (2005) 100 (3): 603–612.
... porphyry Cu-Mo and late Main Stage base-metal mineral deposits, Butte district, Montana— C.W. Field, L. Zhang, J.H. Dilles, R.O. Rye, and M.H. Reed 61 Paleoproterozoic high-sulfidation mineralization in the Tapajós gold province, Amazonian craton, Brazil: Geology, mineralogy, alunite argon age...