ژئوشیمی و تعیین شرایط فیزیکوشیمیایی تشکیل توده گابرویی ورچه (استان مرکزی)

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه لرستان

چکیده

توده­ی گابرویی ورچه در استان مرکزی واقع شده و بخشی از منطقه سنندج ـ سیرجان است. به لحاظ سنگ­شناسی این توده نفوذی دارای ترکیب گابرو، مونزوگابرو بوده و دارای سرشت ماگمائی آلکالن می­­باشد. براساس الگوی عناصر REE بهنجار شده با کندریت، غنی­شدگی از LREE (100برابر) و HREE (10 برابر) و بر مبنای الگوی عناصر کمیاب بهنجار شده با گوشته­ی اولیه، غنی­شدگی از عناصر HFSE (Zr, Ti, P < /span>) را نشان می­دهد. عدم وجود بهنجاری منفی Nb نشانگر ماگماتیسم با ماهیت قلیایی است. براساس رفتار عناصر Zr,Nb,Yb وLa, Sm می­توان چنین استنباط کرد که ماگمای مولد از گوشته­ی غنی شده با  ترکیب اسپینل – گارنت لرزولیت و درجه ذوب­بخشی10-15درصد حاصل شده است. علت این ماگماتیسم را می­توان به ایجاد گسل­های عمیق و ضخیم­شدگی پوسته در اثر فرورانش نئوتتیس وابسته دانست. ترکیب پلاژیوکلازهای توده گابرویی در گستره­ی آندزین ـ لابرادوریت بوده و کلینوپیروکسن­های آن از نوع دیوپسید است. ترکیب شیمیایی کلینوپیروکسن­ها ویژگی­های سری ماگمایی آلکالن را نشان می­دهند. براساس ژئوترموبارومتری دمای تشکیل کلینوپیروکسن­ها بین 1150 تا 1200درجه­سا­نتی­گراد و فشار تشکیل­شان بین 3 تا 7 براورد شده است.     

کلیدواژه‌ها

عنوان مقاله [English]

Geochemistry and physico-chemical conditions of formation of Varcheh Gabbroic Pluton (Markazie Province)

نویسندگان [English]

  • Mohamad Bagheri
  • Zarei Sahamieh
  • Ahmadi Khalaji
  • Zall
چکیده [English]

Varcheh gabbroic pluton is located in Markazi Province and is part of the Sanandaj-Sirjan zone. This pluton is gabbro to monzo-gabbro of alkaline nature. Based on condrite normalized spider diagrams, the REE pattern displays enrichment of LREE (100 times) and HREE (10 times). In addition, based on primitive mantle  normalized spider diagrams, they display enrichment of HFS elements (Zr, Ti, P). Absence of negative anomaly of Nb is due to alkaline nature.  Behavior of Zr, Nb, Yb, La, and Sm elements show that the primary magma is derived from enriched  mantle by the partial melting of 10%-15% of the   spinel - garnet lherzolite, respectively. This magmatism can be related to deep faults and crustal thickening by the Neotethys subduction. The Plagioclase composition in gabbroic pluton is in the range of oligoclase to labradorite and clinopyroxene composition is mainly diopside. The clinopyroxene composition shows that they were crystallized from an alkaline magma. On the basis of geothermobarometry, crystallization-temperature of diopside is estimated to be about 1150°C to 1200 °C and crystallization-pressure for the diopside is between 3 - 7 kb.

کلیدواژه‌ها [English]

  • plagioclase
  • clinopyeroxene
  • Gabbro
  • alkaline
  • Varcheh
  • Sanandaj-Sirjan Zone

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  • تاریخ دریافت: 07 بهمن 1395
  • تاریخ بازنگری: 08 اردیبهشت 1396
  • تاریخ پذیرش: 06 خرداد 1396

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