کانی‌شناسی، دگرسانی، زمین‌شیمی و بررسی سیال‌های درگیرکانی‌سازی اکسیدآهن- مس منطقه نامق، شمال شرقی کاشمر

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه فردوسی مشهد

چکیده

منطقه نامق در شمال شرق کاشمر، استان خراسان رضوی، و در مرکز کمربند ماگمایی خواف-کاشمر- بردسکن واقع است. زمین­شناسی منطقه پوشیده از تراکی­آندزیت و واحد­های آذرآواری شامل توف تراکی­آندزیتی تا ریولیتی است که دایک­های مونزودیوریتی در آنها نفوذ کرده­اند. کانی­سازی به شکل رگه­ای با امتداد شمال شرقی- جنوب غربی و شیب 75 درجه به سمت شمال شرقی، در پهنه­های گسلی و در سنگ میزبان تراکی­آندزیت و توف تراکی­آندزیتی تشکیل شده است. کانی­های اولیه شامل اسپکیولاریت، کالکوپیریت و مگنتیت همراه با باطله کوارتز و کانی­های ثانویه شامل گوتیت، هماتیت و مالاکیت است. سیلیسی شدن مهمترین دگرسانی همراه با کانی­سازی است. ناهنجاری قابل ملاحظه مس تا بیش از دو درصد و مقادیر پایین طلا تا 20 میلی­گرم در تن در رگه دیده می­شود. بر پایه بررسی سیال­های درگیر، دمای تشکیل کانی­سازی بین 300 تا 496 درجه سانتیگراد بوده و از محلولی شامل نمک­های NaCl و CaCl2 با درجه شوری 11 تا 22 درصد وزنی بوجود آمده است. آمیختگی دو سیال با دما- شوری بالا و دما- شوری پایین، باعث کاهش دما و شوری و رقیق­شدگی شده و شرایط را برای ته­نشست اکسیدآهن و مس از کمپلکس­های کلریدی فراهم کرده ­است. مدل آمیختگی آب ماگمایی و آب جوی بهترین مدل برای تشکیل رگه­ آهن- مس­دار منطقه نامق است. این کانی­سازی در فشار 10 تا 60 مگاپاسکال و در عمقی بین 5/0 تا 2 کیلومتر (برپایه فشار سنگ­کره) تشکیل شده است. کنارزایی کانیایی، سنگ میزبان، دگرسانی، کنترل ساختاری و ماهیت محلول کانه­دار نشان می­دهد که کانی­سازی از نوع گرمابی مس غنی از اکسید آهن (اکسید آهن-مس) است.

کلیدواژه‌ها


عنوان مقاله [English]

Mineralogy, Alteration, geochemistry, and fluid inclusion studies of Fe oxide-copper mineralization of Namegh area, NE Kashmar

نویسندگان [English]

  • hakimeh Taghadosi
  • azadeh Malekzadeh Shafaroudi
Ferdowsi University of Mashhad
چکیده [English]

Namegh area is located northeast Kashmar, Khorasan Razavi Province, and contral parts of the Khaf-Kashmar-Bardaskan magmatic belt. Geology of the area consists of trachyandesite and pyroclastic rocks including trachyandesitic to rhyolitic tuff, which are intruded by monzodioritic dykes. Mineralization is occurred as vein type with NW-SE trending and 75°NE inclination hosted by trachyandesite and trachyandesitic tuff. Primary minerals are specularite, chalcopyrite, and magnetite and secondary minerals are goethite, hematite, and malachite. Silicification is the most important alteration. High anomaly of Cu (up to 2%) and low values of Au (maximum 20 ppb) are present in the vein. Based on fluid inclusion studies, formation temperature of mineralization is between 300 to 496 ºC and it is occurred from NaCl- and CaCl2-bearing fluid with 11 to 22 wt. % NaCl equivalent salinity. Temperature and salinity is decreased and dilution occurs due to mixing of two high temperature-salinity and low temperature-salinity fluids resulting Fe oxide and copper is deposited from chloride ligands. Mixing of magmatic and meteoric waters model is the best model for generation of Namegh iron-copper vein. This mineralization is occurred at 10 to 60 Mpa pressure and 0.5 to 2 Km depth (assuming lithostatic pressure). Mineral paragenesis, host rock, alteration, structural control, and nature of ore fluid indicate mineralization is Iron oxide-copper hydrothermal type. 

کلیدواژه‌ها [English]

  • Mineralization
  • alteration
  • Geochemistry
  • fluid Inclusion
  • Fe oxide- copper
  • Namegh
  • NE Iran
  1. [1] Karimpour M. H., Malekzadeh Shafaroudi A., Esfandiarpour A., Mahammad nejad H., "Neyshabur turquoise mine: The first mineralization of Cu-Au-U-LREE, IOCG type in Iran", Economic Geology 2 (2011) 193-216.
  2. [1] Karimpour M. H., Malekzadeh Shafaroudi A., Esfandiarpour A., Mahammad nejad H., "Neyshabur turquoise mine: The first mineralization of Cu-Au-U-LREE, IOCG type in Iran", Economic Geology 2 (2011) 193-216.
  3. [2] Golmohammadi A., Karimpour M. H., Malekzadeh Shafaroudi A., Mazaheri S. A., " Petrology and geochronology of Zircon in intrusion of southern A,C in U-Pb type and Dardavey regions, Iron ore Khaf Sangan ", Economic Geology 2 (2013) 155-173.
  4. [2] Golmohammadi A., Karimpour M. H., Malekzadeh Shafaroudi A., Mazaheri S. A., " Petrology and geochronology of Zircon in intrusion of southern A,C in U-Pb type and Dardavey regions, Iron ore Khaf Sangan ", Economic Geology 2 (2013) 155-173.
  5. [3] Almasi A., Karimpour M. H., Ebrahimi Nasrabadi Kh., Rahimi b., Li Q. L., Santos J. F., "Geology, minerlisation, U-Pb geochronology and geochemistry of Sr-Nd isotopes in intrusion of northeastern Kashmar", Economic Geology 1 (2015) 69-90.
  6. [3] Almasi A., Karimpour M. H., Ebrahimi Nasrabadi Kh., Rahimi b., Li Q. L., Santos J. F., "Geology, minerlisation, U-Pb geochronology and geochemistry of Sr-Nd isotopes in intrusion of northeastern Kashmar", Economic Geology 1 (2015) 69-90.
  7. [4] Shafaii Moghadam H., Li X. H., Ling X. X., Santos J. F., Stern R. J., Li Q. L., Ghorbani G., "Eocene Kashmar granitoids (NE Iran): Petrogenetic constraints from U–Pb zircon geochronology and isotope geochemistry", Lithos 216–217 (2015) 118–135. [DOI:10.1016/j.lithos.2014.12.012]
  8. [4] Shafaii Moghadam H., Li X. H., Ling X. X., Santos J. F., Stern R. J., Li Q. L., Ghorbani G., "Eocene Kashmar granitoids (NE Iran): Petrogenetic constraints from U–Pb zircon geochronology and isotope geochemistry", Lithos 216–217 (2015) 118–135. [DOI:10.1016/j.lithos.2014.12.012]
  9. [5] Malekzadeh Shafaroudi A., Karimpour M.H., Golmohammadi A., "Zircon U–Pb geochronology and petrology of intrusive rocks in the C-North and Baghak districts, Sangan iron mine, NE Iran", Journal of Asian Earth Sciences 64 (2013) 256–271. [DOI:10.1016/j.jseaes.2012.12.028]
  10. [5] Malekzadeh Shafaroudi A., Karimpour M.H., Golmohammadi A., "Zircon U–Pb geochronology and petrology of intrusive rocks in the C-North and Baghak districts, Sangan iron mine, NE Iran", Journal of Asian Earth Sciences 64 (2013) 256–271. [DOI:10.1016/j.jseaes.2012.12.028]
  11. [6] Mazloumi A., Karimpour M. H., Rasa A., Rahimi B., Vosoughi Abedini M., "Torbat-e-Heydaryeh Kohe-Zar Gold deposit, new model of Gold mineralization", Iranian Journal of Crystallography and Mineralogy 3 (2008) 363-376.
  12. [6] Mazloumi A., Karimpour M. H., Rasa A., Rahimi B., Vosoughi Abedini M., "Torbat-e-Heydaryeh Kohe-Zar Gold deposit, new model of Gold mineralization", Iranian Journal of Crystallography and Mineralogy 3 (2008) 363-376.
  13. [7] Golmohammadi A., Karimpour M. H., Malekzadeh Shafaroudi A., Mazaheri S. A., "Alteration-mineralization, and radiometric ages of the source pluton at the Sangan iron skarn deposit, northeastern Iran", Ore Geology Reviews 65 (2015) 545–563. [DOI:10.1016/j.oregeorev.2014.07.005]
  14. [7] Golmohammadi A., Karimpour M. H., Malekzadeh Shafaroudi A., Mazaheri S. A., "Alteration-mineralization, and radiometric ages of the source pluton at the Sangan iron skarn deposit, northeastern Iran", Ore Geology Reviews 65 (2015) 545–563. [DOI:10.1016/j.oregeorev.2014.07.005]
  15. [8] Karimpour M. H., Malekzadeh Shafaroudi A., "Comparison of the geochemistry of source rock at Tanourjeh Au-bearing magnetite & Sangan Au-free magnetite deposits, Khorasan Razavi, Iran", Iranian Journal of Crystallography and Mineralogy 1 (2006) 3-26.
  16. [8] Karimpour M. H., Malekzadeh Shafaroudi A., "Comparison of the geochemistry of source rock at Tanourjeh Au-bearing magnetite & Sangan Au-free magnetite deposits, Khorasan Razavi, Iran", Iranian Journal of Crystallography and Mineralogy 1 (2006) 3-26.
  17. [9] Yousefi souran L., Heidarian Shahri M., Karimpour M., "Geology, mineralogy, fluid inclusion thermometry and ground magnetic of Shahrak Magnetite-Specularite Cu-Au prospecting area, Torbat-e-Heydaryeh, Iran", Iranian Journal of Crystallography and Mineralogy 3 (2008) 505-516.
  18. [9] Yousefi souran L., Heidarian Shahri M., Karimpour M., "Geology, mineralogy, fluid inclusion thermometry and ground magnetic of Shahrak Magnetite-Specularite Cu-Au prospecting area, Torbat-e-Heydaryeh, Iran", Iranian Journal of Crystallography and Mineralogy 3 (2008) 505-516.
  19. [10] Gholami S., "Geology, Mineralization, Geochemistry and magnetic of Shotor sang iron deposit, northeastern Sabzevar", thesis of MSc in Ferdowsi university of Mashhad (2009) 240.
  20. [10] Gholami S., "Geology, Mineralization, Geochemistry and magnetic of Shotor sang iron deposit, northeastern Sabzevar", thesis of MSc in Ferdowsi university of Mashhad (2009) 240.
  21. [11] Karimpour M. H., Saadat S., Malekzadeh Shafaroudi A., "Exploration and introduction of Fe oxide mineralization (Cu-Au type) and magnetite related to volcanic-plutonic belt of Khaf-Kashmar-Bardaskan", 21th of symposium of Geoscience (2002).
  22. [11] Karimpour M. H., Saadat S., Malekzadeh Shafaroudi A., "Exploration and introduction of Fe oxide mineralization (Cu-Au type) and magnetite related to volcanic-plutonic belt of Khaf-Kashmar-Bardaskan", 21th of symposium of Geoscience (2002).
  23. [12] Behrouzi A., "Geological map of Feyzabad scaling 1:100000, Geological Survey & Mineral Exploration of Iran" (1987).
  24. [12] Behrouzi A., "Geological map of Feyzabad scaling 1:100000, Geological Survey & Mineral Exploration of Iran" (1987).
  25. [13] Lecumberri-Sanchez P., Steel-MacInnis M., Bodnar R.J., "A numerical model to estimate trapping conditions of fluid inclusions that homogenize by halite disappearance", Geochimica et Cosmochimica Acta 92 (2012) 14-22. [DOI:10.1016/j.gca.2012.05.044]
  26. [13] Lecumberri-Sanchez P., Steel-MacInnis M., Bodnar R.J., "A numerical model to estimate trapping conditions of fluid inclusions that homogenize by halite disappearance", Geochimica et Cosmochimica Acta 92 (2012) 14-22. [DOI:10.1016/j.gca.2012.05.044]
  27. [14] Steele-MacInnis M., Lecumberri-Sanchez P., Bodnar R.J., "HOKIEFLINCS-H2O-NACL: A Microsoft Excel spreadsheet for interpreting microthermometric data from fluid inclusions based on the PVTX properties of H2O–NaCl", Computer in Geosciences 49 (2012) 334–337. [DOI:10.1016/j.cageo.2012.01.022]
  28. [14] Steele-MacInnis M., Lecumberri-Sanchez P., Bodnar R.J., "HOKIEFLINCS-H2O-NACL: A Microsoft Excel spreadsheet for interpreting microthermometric data from fluid inclusions based on the PVTX properties of H2O–NaCl", Computer in Geosciences 49 (2012) 334–337. [DOI:10.1016/j.cageo.2012.01.022]
  29. [15] Whitney D.L., Evan, B.W., "Abbrevations for names of rock-forming minerals", American Mineralogist 95 (2010) 185-187. [DOI:10.2138/am.2010.3371]
  30. [15] Whitney D.L., Evan, B.W., "Abbrevations for names of rock-forming minerals", American Mineralogist 95 (2010) 185-187. [DOI:10.2138/am.2010.3371]
  31. [16] Roedder E., "Fluid inclusions. Reviews in Mineralogy", 12 (1984) 644 pp.
  32. [16] Roedder E., "Fluid inclusions. Reviews in Mineralogy", 12 (1984) 644 pp.
  33. [17] Sheppherd T.j., Rankin A.H., Alderton D.H.M., "A Practical Guide to Fluid Inclusion Studies", Blackie and Son (1985) 239 pp.
  34. [17] Sheppherd T.j., Rankin A.H., Alderton D.H.M., "A Practical Guide to Fluid Inclusion Studies", Blackie and Son (1985) 239 pp.
  35. [18] Wilkinson J.J., "Fluid Inclusion in Hydrothermal Ore Deposits", Lithos 55 (2001) 229-272. [DOI:10.1016/S0024-4937(00)00047-5]
  36. [18] Wilkinson J.J., "Fluid Inclusion in Hydrothermal Ore Deposits", Lithos 55 (2001) 229-272. [DOI:10.1016/S0024-4937(00)00047-5]
  37. [19] Van den Kerkhof A.M., Hein U.F., "Fluid inclusion petrography", Lithos 55 (2001) 27–47. [DOI:10.1016/S0024-4937(00)00037-2]
  38. [19] Van den Kerkhof A.M., Hein U.F., "Fluid inclusion petrography", Lithos 55 (2001) 27–47. [DOI:10.1016/S0024-4937(00)00037-2]
  39. [20] Ulrich T., Gunther D., Heinrich C.A., "Evolution of a porphyry Cu-Au deposit, based on LA-ICP-MS analysis of fluid inclusions: Bajo de la Alumbera, Argentina", Economic Geology 97 (2002) 1888-1920. [DOI:10.2113/gsecongeo.97.8.1889]
  40. [20] Ulrich T., Gunther D., Heinrich C.A., "Evolution of a porphyry Cu-Au deposit, based on LA-ICP-MS analysis of fluid inclusions: Bajo de la Alumbera, Argentina", Economic Geology 97 (2002) 1888-1920. [DOI:10.2113/gsecongeo.97.8.1889]
  41. [21] Seward T.M., "The hydrothermal geochemistry of gold", in: Foster, R.P. (ed.), gold metallogeny and exploration, Blakie and Sons Ltd (1991) 432 pp.
  42. [21] Seward T.M., "The hydrothermal geochemistry of gold", in: Foster, R.P. (ed.), gold metallogeny and exploration, Blakie and Sons Ltd (1991) 432 pp.
  43. [22] Thiersch P.C., Williams-Jones A.E., Clark J.R., "Epithermal mineralization and ore controls of the Shasta Au-Ag deposit, Toodoggone District, British Columbia, Canada", Mineralium Deposita 32(1997) 44-57. [DOI:10.1007/s001260050071]
  44. [22] Thiersch P.C., Williams-Jones A.E., Clark J.R., "Epithermal mineralization and ore controls of the Shasta Au-Ag deposit, Toodoggone District, British Columbia, Canada", Mineralium Deposita 32(1997) 44-57. [DOI:10.1007/s001260050071]
  45. [23] Beane R.E., "The Magmatic–Meteoric Transition", Geothermal Resources Council, Special Report 13 (1983) 245–253.
  46. [23] Beane R.E., "The Magmatic–Meteoric Transition", Geothermal Resources Council, Special Report 13 (1983) 245–253.
  47. [24] Fournier R.O., "Hydrothermal processes related to movement of fluid from plastic into brittle rock in the magmatic-epithermal environment", Economic Geology 94 (1999) 1193–1212. [DOI:10.2113/gsecongeo.94.8.1193]
  48. [24] Fournier R.O., "Hydrothermal processes related to movement of fluid from plastic into brittle rock in the magmatic-epithermal environment", Economic Geology 94 (1999) 1193–1212. [DOI:10.2113/gsecongeo.94.8.1193]
  49. [25] Sillitoe R.H., "Iron oxide-copper-gold deposits: an Andean view", Mineralium Deposita 38 (2003) 787-812 [DOI:10.1007/s00126-003-0379-7]
  50. [25] Sillitoe R.H., "Iron oxide-copper-gold deposits: an Andean view", Mineralium Deposita 38 (2003) 787-812 [DOI:10.1007/s00126-003-0379-7]
  51. [26] Marschick R., Fontignie D., Chiaradia M., Voldet P., "Geochemical and Sr-Nd-Pb-O isotope composition of granitoids of the Early Cretaceous Copiaco plutonic complex (27° 30´S), Chile", Journal of South America Earth Sciences 16 (2003) 381-398 [DOI:10.1016/S0895-9811(03)00104-4]
  52. [26] Marschick R., Fontignie D., Chiaradia M., Voldet P., "Geochemical and Sr-Nd-Pb-O isotope composition of granitoids of the Early Cretaceous Copiaco plutonic complex (27° 30´S), Chile", Journal of South America Earth Sciences 16 (2003) 381-398 [DOI:10.1016/S0895-9811(03)00104-4]
  53. [27] Hitzman M.W., "Iron oxide-Cu-Au deposits: what, where, when and why", Porter TM (ed.) Hydrothermal iron oxide copper-gold and related deposits: a global perspective, Australian Mineral Foundation, Adelaide (2000) 9-25.
  54. [27] Hitzman M.W., "Iron oxide-Cu-Au deposits: what, where, when and why", Porter TM (ed.) Hydrothermal iron oxide copper-gold and related deposits: a global perspective, Australian Mineral Foundation, Adelaide (2000) 9-25.
  55. [28] Pollard P.J., "Evidence of a magmatic fluid and metal source for Fe-oxide Cu-Au mineralization", Porter T.M., (ed.) Hydrothermal iron oxide copper –gold and related deposits: a global perspective 1 (2002) PGC Publishing, Adelaide 27-41.
  56. [28] Pollard P.J., "Evidence of a magmatic fluid and metal source for Fe-oxide Cu-Au mineralization", Porter T.M., (ed.) Hydrothermal iron oxide copper –gold and related deposits: a global perspective 1 (2002) PGC Publishing, Adelaide 27-41.
  57. [29] Allcock J.B., "Skarn and porphyry copper mineralization at Mines Gaspe, Murdochville, Quebec", Economic Geology 77 (1982) 971-999. [DOI:10.2113/gsecongeo.77.4.971]
  58. [29] Allcock J.B., "Skarn and porphyry copper mineralization at Mines Gaspe, Murdochville, Quebec", Economic Geology 77 (1982) 971-999. [DOI:10.2113/gsecongeo.77.4.971]
  59. [30] Simard M., Beaudoin G., Bernard J., Hupe A., "Metallogeny of the Mont-de-l'Aigle IOCG deposits, Gaspe Peninsula, Quebec, Canada", Mineralium Deposita 41 (2006) 607-636. [DOI:10.1007/s00126-006-0061-y]
  60. [30] Simard M., Beaudoin G., Bernard J., Hupe A., "Metallogeny of the Mont-de-l'Aigle IOCG deposits, Gaspe Peninsula, Quebec, Canada", Mineralium Deposita 41 (2006) 607-636. [DOI:10.1007/s00126-006-0061-y]
  61. [31] Pollard P.J., "Sodic(-calcic) alteration associated with Feoxide- Cu-Au deposits: An origin via unmixing of magmaticderived H2O-CO2-salt fluids", Mineralium Deposita 36 (2001) 93–1 00.
  62. [31] Pollard P.J., "Sodic(-calcic) alteration associated with Feoxide- Cu-Au deposits: An origin via unmixing of magmaticderived H2O-CO2-salt fluids", Mineralium Deposita 36 (2001) 93–1 00.
  63. [32] Pollard P.J., "An intrusion-related origin for Cu-Au mineralization in iron oxide-copper-gold (IOCG) provinces", Mineralium Deposita 41 (2006) 179–187. [DOI:10.1007/s00126-006-0054-x]
  64. [32] Pollard P.J., "An intrusion-related origin for Cu-Au mineralization in iron oxide-copper-gold (IOCG) provinces", Mineralium Deposita 41 (2006) 179–187. [DOI:10.1007/s00126-006-0054-x]
  65. [33] Fu B., Williams P.J., Oliver N.H.S., Dong G., Pollard P.J., Mark G., "Fluid mixing versus unmixing as an ore-forming process in the Cloncurry Fe-oxide-Cu-Au district, NW Queensland, Australia: Evidence from fluid inclusions", Journal of Geochemical Exploration 78, (2003) 617–622. [DOI:10.1016/S0375-6742(03)00117-1]
  66. [33] Fu B., Williams P.J., Oliver N.H.S., Dong G., Pollard P.J., Mark G., "Fluid mixing versus unmixing as an ore-forming process in the Cloncurry Fe-oxide-Cu-Au district, NW Queensland, Australia: Evidence from fluid inclusions", Journal of Geochemical Exploration 78, (2003) 617–622. [DOI:10.1016/S0375-6742(03)00117-1]
  67. [34] Rieger A.A., Marschik R., Díaz M., "The evolution of the hydrothermal IOCG system in the Mantoverde district, northern Chile: New evidence from microthermometry and stable isotope geochemistry", Mineralium Deposita 47 (2012) 359–369. [DOI:10.1007/s00126-011-0390-3]
  68. [34] Rieger A.A., Marschik R., Díaz M., "The evolution of the hydrothermal IOCG system in the Mantoverde district, northern Chile: New evidence from microthermometry and stable isotope geochemistry", Mineralium Deposita 47 (2012) 359–369. [DOI:10.1007/s00126-011-0390-3]
  69. [35] Marschick R., Fontboté L., "Copper (–Iron) mineralization and superposition of alteration events in the Punta del Cobre belt, Northern Chile", In: Camus, F., Sillitoe, R.H., Peterson, R., (eds.), Andean copper deposits: new discoveries, mineralization, styles and metallogeny, Society of Economic Geology, Specific Publication 5 (1996) 171–190.
  70. [35] Marschick R., Fontboté L., "Copper (–Iron) mineralization and superposition of alteration events in the Punta del Cobre belt, Northern Chile", In: Camus, F., Sillitoe, R.H., Peterson, R., (eds.), Andean copper deposits: new discoveries, mineralization, styles and metallogeny, Society of Economic Geology, Specific Publication 5 (1996) 171–190.
  71. [36] Simard M., Beaudoin G., Bernard J., Hupe A., "Metallogeny of the Mont-de-l'Aigle IOCG deposit, Gaspé Peninsula, Québec, Canada", Mineralum Deposita 41 (2006) 607–636. [DOI:10.1007/s00126-006-0061-y]
  72. [36] Simard M., Beaudoin G., Bernard J., Hupe A., "Metallogeny of the Mont-de-l'Aigle IOCG deposit, Gaspé Peninsula, Québec, Canada", Mineralum Deposita 41 (2006) 607–636. [DOI:10.1007/s00126-006-0061-y]
  73. [37] Williams P.J., "Classifying IOCG deposits", In: Corriveau. L., Mumin. H., (eds.), Exploring for iron-oxide copper gold deposits: Canada and global analogues, Québec, Geological Association of Canada and Geological Survey of Canada (2010) 11–19.
  74. [37] Williams P.J., "Classifying IOCG deposits", In: Corriveau. L., Mumin. H., (eds.), Exploring for iron-oxide copper gold deposits: Canada and global analogues, Québec, Geological Association of Canada and Geological Survey of Canada (2010) 11–19.