نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران
2 شرکت معدنی احسان پویا، تهران، ایران
چکیده
ناحیه زاغ‌دره در مجموعه افیولیتی صوغان - آبدشت از کمپلکس آمیزه رنگین اسفندقه- فاریاب در جنوب‌خاوری زون سنندج- سیرجان، با رخنمون‌های گسترده از گدازه‌های مافیک-متوسط و یک توده نفوذی فلسیک معرفی می‌شود. سنگ‌های آتشفشانی، کالک‌آلکالن تا تولئیتی و متالومین هستند و در نمودار بهنجارشده نسبت به کندریت، تهی‌شدگی نسبی در عناصر خاکی کمیاب سبک و الگوی کمابیش تخت برای عناصر خاکی کمیاب سنگین به نمایش می گذارند؛ نسبت La/Yb)N) برای بیشتر نمونه‌ها کمتر از یک است. سنگ‌های آتشفشانی زاغ‌دره، از نظر شیمیایی قابل مقایسه با مجموعه‌های آتشفشانی زون فرافرورانش هستند. توده نفوذی زاغ‌دره، بافت چیره پورفیری دارد که با درشت‌بلور‌‌های پلاژیوکلاز و کوارتز، و کمتر از آن هورنبلند، در خمیره‌ای کوارتز- فلدسپاتی خودنمایی می‌کند. نمونه‌های معرف از این توده، در نمودار نورماتیو An-Ab-Or در محدوده تونالیت-ترونجمیت قرار می‌گیرند. توده نفوذی زاغ‌دره، کالک‌آلکالن تا تولئیتی و پرآلومین است و با غنی‌شدگی نسبی از Na2O و CaO و تهی‌شدگی از K2O و Rb و دیگر عناصر لیتوفیل با شعاع یونی بزرگ، و همچنین نسبت پایین K2O/Na2O و نسبت بسیار پایین Rb/Sr و تهی‌شدگی از عناصر خاکی کمیاب سبک LREE مشخص می‌شود که از ویژگی‌های معمول پلاژیوگرانیت‌های اقیانوسی است. نتایج حاصل و مقایسه آن با دیگر مجموعه‌های افیولیتی نشان می‌دهد که رخداد توده‌های پلاژیوگرانیتی با ویژگی‌های کانی‌شناسی و ژئوشیمیایی کمابیش مشابه، پدیده‌ای تکرارشونده در مجموعه‌های افیولیتی زون‌های فرافرورانش و همبسته با فرایندهای موثر در زایش و تحول این مجموعه‌ها است.
کلیدواژه‌ها
موضوعات
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ناظم‌زاده، م.، روشن‌روان، ج. و عزیزان، ح.، 1375، نقشه زمین‌شناسی باغات، مقیاس 1:100000، سازمان زمین‌شناسی و اکتشافات معدنی کشور.
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حیدری، خ.، نصرآبادی، م. و نوزعیم، ر.، 1395، کانی‌شناسی، ژئوشیمی و پتروژنز توده‌های پلاژیوگرانیتی موجود در متاگابروهای مجموعه افیولیتی جنوب مهریز (جنوب‌غرب یزد)، مجله علوم‌زمین خوارزمی، شماره 1، 13-20 .
عزیزان، ح. و نادری، ن.، 1385، نقشه زمین‌شناسی دولت‌آباد، مقیاس 1:10000، سازمان زمین‌شناسی و اکتشافات معدنی کشور.
علیزاده، ا.، آروین، م. و درگاهی، س.، 1391، زمین‌شیمی و پتروژنز پلاژیوگرانیت‌های مجموعه افیولیتی نیریز- ایران: با تاکیدی بر منشا آنها، مجله علمی- پژوهشی پترولوژی، سال سوم، شماره دوازدهم، زمستان 1391، 1-14.
گلستانی، م.، درگاهی، س. و آروین، م.، 1392، منشا پلاژیوگرانیت‌ها و گابروهای افیولیت ملانژ بافت؛ واقع در جنوب‌غرب کرمان، مجله بلورشناسی و کانی‌شناسی ایران، سال بیست و یکم، شماره 4، 625-636.
ناظم‌زاده، م. و رشیدی، ع.، 1385، نقشه زمین‌شناسی دهسرد (بزار)، مقیاس 1:100000، سازمان زمین‌شناسی و اکتشافات معدنی کشور.
ناظم‌زاده، م.، روشن‌روان، ج. و عزیزان، ح.، 1375، نقشه زمین‌شناسی باغات، مقیاس 1:100000، سازمان زمین‌شناسی و اکتشافات معدنی کشور.
سبزه‌ای، م.، 1375، نقشه زمین‌شناسی حاجی‌آباد، مقیاس 1:250000، سازمان زمین‌شناسی و اکتشافات معدنی کشور.
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