ترکیب کانی‌شناختی و شیمیایی تورمالین مناطق نجم‌آباد، قشلاق، هیرد، ماهرآباد- خوپیک و ارتباط آن با نوع کانی‌سازی، شرق ایران

نویسندگان

1 دانشگاه فردوسی مشهد

2 دانشگاه کلرادو

چکیده

 تورمالین در زون­های دگرسانی و کانی­سازی مناطق اکتشافی مس- طلای پورفیری ماهرآباد- خوپیک، قلع – تنگستن نجم آباد، طلا- قلع هیرد و دایک­های پگماتیتی قشلاق تشکیل شده است. براساس مطالعات پرتو اشعه ایکس تورمالین مناطق ماهرآباد، قشلاق و هیرد از نوع شورل و مناطق خوپیک و  نجم آباد از نوع درآویت هستند. براساس ترکیب شیمیایی، تمامی تورمالین­های مورد از نوع آلکالی هستند. نسبت Mg/(Mg+Fe)  در تورمالین قشلاق 0.21-0.29، در هیرد 0.32-0.47، ماهرآباد 0.44-0.5، در نجم­آباد و خوپیک 0.55-0.82 است. میزان Mg =1.9-2.3 تورمالین خوپیک بیشتر از ماهرآباد  Mg= 1.4-1.9است. میزان متوسط   TiO2 در تورمالین ماهرآباد  0.35 و در تورمالین خوپیک 0.19 است. در خوپیک بخش عمیقتر سیستم مس – طلای پورفیری رخنمون دارد. تورمالین نجم­آباد بیشترین میزان (Mg= 2.2) و تورمالین قشلاق کمترین میزان (Mg=0.5-0.7) را دارد. تورمالین نجم­آباد بیشترین میزان TiO2 (0.48%) و در سایر مناطق میزان TiO2 کمتر از 0.3 % است.  بطور کلی رابطه معکوس بین میزان فراوانی CaO و Na2O در تورمالین­های مورد مطالعه مشاهده می­شود. تورمالین قشلاق دارای کمتربن میزان CaO  و بیشترین میزان Na2O است. میزان CaO و Na2O در تورمالین هیرد خیلی متغیر است.

کلیدواژه‌ها


عنوان مقاله [English]

Mineralogical and Chemical Composition of Tourmaline from Najmabad, Gheshlagh, Hired and Maherabad-Khopik, and their relationship with types of mineralization, Eastern Iran

چکیده [English]

Tourmaline is present as alteration and mineralization at Maherabad and Khopik Cu-Au prospecting areas, Najmabad Sn-W-Au prospecting areas, Hired Au-Sn prospecting area, and within Gheshlagh pegmatite dikes. Based on X-ray diffraction graphs, Maherabad, Gheshlagh and Hired tourmaline are schorl, but Najmabad and Khopik are dravite type. Based on chemical composition, all of tourmalines belong to alkali group. The Mg/(Mg+Fe) ratio in Gheshlagh tourmaline is 0.21-0.29, in Hired is 0.32-0.47 and  in Maherabad is  0.44-0.5 and in  Najmabad and Khopik are Mg/(Mg+Fe)= 0.55-0.82. Khopik tourmaline contains considerably higher Mg (1.9-2.3) compared with the Maherabad (Mg = 1.4-1.9). The average TiO2 content of Maherabad tourmaline is 0.35 and Khopik is 0.19. At Khopik, deeper portion of the porphyry Cu-Au is exposed. Najmabad tourmaline contains the highest Mg (Mg= 2.2) and Gheshlagh the lowest Mg (Mg=0.5-0.7) and highest Fe (Fe= 1.9-2.3). Najmabad tourmaline contains the highest TiO2 (0.48%) and other tourmaline contains less than 0.3 % TiO2. In general, there is a reverse correlation between CaO and Na2O. Gheshlagh has the lowest CaO and highest Na2O. The CaO and Na2O content of tourmaline from Hired are very variable.

کلیدواژه‌ها [English]

  • tourmaline
  • Najmabad
  • Maherabad
  • Gheshlagh
  • Hired
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