بررسی ساختار درونی، شیمی کانی‌ها و خاستگاه اکسید Fe-Ti در توده نفوذی مافیک – فرامافیک لایه‌ای غازان – خانیک، شمال غرب ارومیه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه ارومیه

2 دانشگاه LM مونیخ

چکیده

مجموعه غازان – خانیک یک توده نفوذی مافیک – فرامافیک لایه­ای کوچک با سن پرمین هست که در انتهای شمال غربی پهنه سنندج ­– ­سیرجان در سنگ­های دگرگونی پرکامبرین رخنمون دارد. بررسی­های صحرایی، شیمی کانی­ها و مجموعه کانیایی نشان می­دهد که این توده چهار پهنه دارد. پائین­ترین پهنه گابروهای غیر­لایه­ای با ترکیب گابروهای نوریتی ریز­دانه و بدون کانه­زایی است. پهنه دوم فرامافیک­های بدون آپاتیت غنی از اکسید Fe-Ti (25-30%) شامل کلینوپیروکسنیت،­ ورلیت و اندکی دونیت است. کانه­زایی اکسید Fe-Ti خالص (با بیش از %90) بصورت بخش­های انباشتی سیل­مانند مجزا در این پهنه صورت گرفته­ است. گابروهای لایه­ای، پهنه سوم را تشکیل می­دهند. کانه­زایی اکسید  Fe-Ti(%5-5/0) در این پهنه فقط در بخش­های دربردارنده آپاتیت صورت گرفته است.  بالاترین پهنه شامل آنورتوزیت و پگماتیت گابروهایی با %2-0 اکسید Fe-Ti است. بر پایه این بررسی­ها، در تشکیل لایه­های غنی از اکسید Fe-Ti، هر دو فرآیند (1) غنی­شدگی در مذاب­های باقیمانده مشتق شده از یک ماگمای مادر فروبازالتی و (2) تزریق یک سیال غنی از Fe-Ti حل نشده به داخل بخش مافیک – فرامافیک در حال تبلور دخیل هستند.     

کلیدواژه‌ها

عنوان مقاله [English]

Investigation internal structure, mineral chemistry and origin of Fe-Ti oxide in Ghazan-Khanik mafic-ultramafic layered intrusion, NW Urmia

نویسندگان [English]

  • Manijeh Asadpour 1
  • Hovis Heuss 2
1
2
چکیده [English]

Ghazan-Khanik complex is a small mafic-ultramafic intrusive body with Permian age at the extremity of NW of the Sanandaj-Sirjan zone, has intruded into the Precambrian metamorphic rocks. Field studies, geochemistry mineral compositions and assemblages of them demonstrate this complex has four lithological zones. The lower zone of non-layered gabbro is the fine-grain gabbronoritic component and non-mineralized. The second zone include of non-apatite ultramafic, clinopyroxenite, verlite and minor amounts of dunite with high proportion of Fe-Ti oxide (25-30%). The pure Fe-Ti oxide mineralization (with highly 90%) occurred as sill-like cumulates parts within this ultramafic zone. The third zone consists of layered gabbro, which is occurred Fe-Ti oxide mineralization (0.5-5%) only in the apatite-rich mafic parts. The upper zone includes the anorthosite and pegmatite gabbro with 0-2% Fe-Ti oxide. Based on this studies for establishment of rich Fe-Ti oxide layers, two processes are involved; (1) enrichment in residual melts which is derived from basaltic parental magma and (2) injection of Fe-Ti oxide immiscible melts into mafic-ultramafic crystallizing mass.

کلیدواژه‌ها [English]

  • Fe-Ti oxide
  • Mineral chemistry
  • internal structure
  • mafic-ultramafic layered Ghazan-Khanik

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  • تاریخ دریافت: 09 دی 1396
  • تاریخ بازنگری: 16 اسفند 1396
  • تاریخ پذیرش: 26 فروردین 1397

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