سنگ‌نگاری و زمین‌شیمی سنگ‌های ماگمایی منطقه شمال کلاته‌شب (شرق سربیشه)، شرق ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه بیرجند

چکیده

منطقه مورد بررسی در 105 کیلومتری شرق سربیشه در استان خراسان جنوبی و در پهنه جوش خورده سیستان قرار دارد. سنگ­های ماگمایی این منطقه به­صورت توده­های عمیق و نیمه عمیق شامل دیوریت، کوارتز دیوریت، کوارتز دیوریت پورفیری و دیوریت پورفیری با سن الیگو میوسن رخنمون دارند. این سنگ­ها دارای بافت­های دانه­ای، پورفیری با زمینه ریزدانه، افیتیک، میان دانه­ای و گلومروپورفیری هستند. کانی­های سازنده سنگ­های بررسی شده شامل پلاژیوکلاز، هورنبلند و کوارتز، بیوتیت، کلینوپیروکسن، آپاتیت، زیرکن و اسفن هستند. ماگمای سازنده این سنگ­ها دارای ماهیت آهکی قلیایی پتاسیم پایین است. نمونه­ها غنی شدگی نسبی از عناصر خاکی نادر سبک و تهی­شدگی از عناصر خاکی نادر سنگین را نشان می­دهند. ناهنجاری منفی عناصر P < /span> ,Nb و  Tiو ناهنجاری مثبت K و Cs در این نمونه­ها نشانگر تشابه آن­ها با فعالیت ماگمایی کمان­های آتشفشانی است. غنی شدگی در عناصر سنگ دوست بزرگ یون نسبت به عناصر با شدت میدان بالا نشان دهنده ماگمای وابسته به مناطق فرورانش است.

کلیدواژه‌ها


عنوان مقاله [English]

Petrography and geochemistry of magmatic rocks in north of Kalate Shab area (East of Sarbisheh), Eastern Iran

نویسندگان [English]

  • Yari
  • Zarrinkoub
  • Mohammadi
چکیده [English]

The study area is located about 105 kilometers east of Sarbisheh in Southern Khorasan and in the Sistan suture zone. The magmatic rocks of this area are exposed as intrusive and sub volcanice including diorite, quartz diorite, porphyry quartz diorite and porphyry diorite with Oligocene- Miocene age. These rocks have granular, porphyry with fine- grained matrix, ophitic, intergranular and glomerular porphyry textures. The minerals that form the investigated rocks include plagioclase, hornblende, quartz, biotite, clinopyroxene, apatite, zircon and sphene. The magmas that form these rocks are of low calc-alkaline and meta-alumina nature. The samples show relative enrichment of light Rare Earth Elements (LREE) and Heavy Rare Earth Elements (HREE). The negative anomaly of P, Nb and Ti elements and the positive anomaly of K and Cs in these samples indicate their similarity with the volcanic arc magmatism. The enrichment of LILE elements relative to HFSE indicates subduction- related magmas.

کلیدواژه‌ها [English]

  • Porphyry quartz diorite
  • Kalate Shab
  • Oligo Miocene
  • Sistan suture Zone
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