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Volume 14 Issue 1
Mar 2003
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Pouran Behnia, Lorence G Collins, Bahram A Samani. K- and Si-Metasomatism, Mineral Transformation and Formation of Granitoids from Basic Rocks in Qooshchi Area, NW Iran: A Mineralogical Context. Journal of Earth Science, 2003, 14(1): 34-41.
Citation: Pouran Behnia, Lorence G Collins, Bahram A Samani. K- and Si-Metasomatism, Mineral Transformation and Formation of Granitoids from Basic Rocks in Qooshchi Area, NW Iran: A Mineralogical Context. Journal of Earth Science, 2003, 14(1): 34-41.

K- and Si-Metasomatism, Mineral Transformation and Formation of Granitoids from Basic Rocks in Qooshchi Area, NW Iran: A Mineralogical Context

  • Received Date: 20 Sep 2002
  • Accepted Date: 20 Dec 2002
  • The Qooshchi area lies to northwest of Orumieh Lake in western Azerbaijan, NW Iran. A basement metamorphic complex, consisting of Precambrian schists and gneisses, has been intruded by gabbros and diorites. Granitoids are grouped into five suites according to their mineralogy, texture and exposed features. The main body, pink Qooshchi granite, and apophyse-like, myrmekite-bearing grani toids are discussed in this paper. On the basis of field observations and micros copic studies, an intensive metasomatism has overprinted the country rocks, espe cially gabbros, transforming them into a more felsic composition. A prior ev ent of intensive deformation and cataclasis preceded the metasomatism, allowing the introduction of hydrothermal fluids. K-metasomatism converted plagioclase into K-feldspar (microcline), myrmekite, and sodic plagioclase as Si-metasomati sm replaced the ferromagnesian silicates by quartz. Apophyse like bodies within gabbros, called leucometasomatites, are formed during this process.

     

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  • Becke F, 1908. ber Myrmekit. Mineralogie und Petrographie Mitteilungen, 27: 377-390 doi: 10.1007/BF02993577
    Behnia P, 1995. Petrogenesis of Granitoids of Qooshchi Area: A Process of Alkaline Metasomatism: [Dissertation]. Tehran: Tehran University. 210(in Persian)
    Behnia P, Collins L G, 1998. Petrogenesis of the Qooshchi Granite by K- and Si-Metasomatism of Diorites and Gabbros, Western Azerbaijan, Iran. http://www.csun.edu/~vcgeo005/iran.html
    Bonin B, 1990. From Orogenic to Anorogenic Settings: Evolution of Granitoid Suites after a Major Orogenesis. Geol J, 25: 261-270 doi: 10.1002/gj.3350250309
    Collins L G, 1988. Hydrothermal Differentiation and Myrmekite—A Clue to Many Geological Puzzles. Athens: Theophrastus Publications. 387
    Collins L G, 1997a. Origin of Myrmekite and Metasomatic Granite. http://www.csun.edu/~vcgeo005/revised1.htm
    Collins L G, 1997b. Replacement of Primary Plagioclase by Secondary K-feldspar and Myrmekite. http://www.csun.edu/~vcgeo005/revised2.htm
    Collins L G, 1997c. Microscopic and Megascopic Relationships for Myrmekite-Bearing Granitic Rocks Formed by K-metasomatism. http://www.csun.edu/~vcgeo005/revised3.htm
    Collins L G, 2000. Scientific Errors That can Result When Myrmekite and Geologic Evidence are Ignored. http://www.csun.edu/~vcgeo005/SciErrors.htm
    Collins LG, Collins B J, 2002. Myrmekite Formation at Temecula, California, Revisited: A Photomicrographic Essay Illustrating Replacement Textures. http://www.csun.edu/~vcgeo005/SciErrors.htm
    Eby G N, 1990. The A-type Granitoids: A Review of Their Occurrence and Chemical Characteristics and Speculations on Their Petrogenesis. Lithos, 26: 115-134 doi: 10.1016/0024-4937(90)90043-Z
    Hagghipour A, Aghanabati A, 1988. Explanatory Text of the Serow Quadrangle Map 1∶ 250 000. Tehran: Geological Survey of Iran. 58
    Hunt C W, Collins L G, Skobelin E A, 1992. Expanding Geospheres, Energy and Mass Transfers from Earth's Interior. Calgary: Polar Publishing Co. 421
    Jahangiri A, 1990. Petrology and Geochemistry of Granites of Qooshchi Area: [Dissertation]. Tabors: Tabors University. 113(in Persian)
    Khodabandeh A, Amini F A, 1991. Geologic Map of Tasooj Quadrangle. Tehran: Geological Survey of Iran
    Orville P M, 1962. Alkali Metasomatism and Feldspars. Norsk Geologisk Tiddskrift, 42: 283-316
    Orville P M, 1963. Alkali Ion Exchange between Vapor and Feldspar Phases. American Journal of Sciences, 261: 201-237 https://www.ajsonline.org/content/261/3/201
    Rong J S, 2002. Myrmekite Formed by Na- and Ca-Metasomatism of K-feldspar. http://www.csun.edu/~vcgeo005/
    Pitcher W S, 1993. The Nature and Origin of Granites. London: Blackie Academic & Professional. 321
    Samani B A, Chen Z, Guo X, et al, 1993. Geology of Precambrian in Central Iran: On the Context of Stratigraphy, Magmatism and Metamorphism. Iranian Journal of Earth Sciences, 10: 40-63(in Persian) https://www.researchgate.net/publication/281560824_Geology_of_Precambrian_in_central_Iran_on_the_context_of_stratigraphy_magmatism_and_metamorphism
    Schwantke A, 1909. Die Beimischung von Ca in Kalifeldspat und die Myrmekitbildung. Zentblatt fǜr Mineralogie, 1: 311-316
    Smith J V, 1974. Feldspar Minerals. V 2, Berlin-Heidelburg: Springer-Verlag. 690
    Winkler HG F, 1976. Petrogenesis of Metamorphic Rocks. New York: Springer-Verlag. 348
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