کانی شناسی و زمین‌شیمی سنگ‌های آذرین کوه جوش رستاق، جنوب شرق داراب

شفیعی, روح الله; پوستی, محمد; قدمی, غلامرضا; فدائیان, محمد

doi:10.22128/ijcm.2025.2962.0

کانی شناسی و زمین‌شیمی سنگ‌های آذرین کوه جوش رستاق، جنوب شرق داراب

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشگاه هرمزگان

² دانشگاه پیام نور

10.22128/ijcm.2025.2962.0

چکیده

منطقه مورد بررسی در استان فارس و جنوب شرق شهرستان داراب واقع است. این منطقه از نظر تقسیمبندی پهنههای ساختاری ایران، در پهنه ساختاری سنندج سیرجان قراردارد. این منطقه بیشتر شامل سنگهای بازالتی و آندزیتی به سن مزوزوئیک است. بررسیهای سنگنگاری نشان می‌دهد که سنگ‌های آندزیتی بیشتر دربرگیرنده درشت بلور‌های پلاژیوکلاز و آمفیبول هستند، در حالیکه بازالت‌ها افزون بر پلاژیوکلاز دارای درشت بلور‌های پیروکسن و الیوین هستند. شواهد زمین شیمی، سری‌های ماگمایی تولئیتی تا آهکی قلیایی را تأیید می‌کند، روند کاهشی مقادیر Al₂O₃، CaO، MgO و Fe₂O₃ نسبت به SiO₂ و عناصر ناسازگار اثر فرایندهای تبلور جدایشی را مشخص مینماید. ناهنجاری مثبت Nb و نیز الگوی غنیشدگی عناصر خاکی نادر (REE) میتواند نشانگر دگرنهادی گوشته باشد و گویای سهم ناچیز پوسته در پیدایش ماگماهاست. داده‌های عناصر کمیاب نشان دهنده جدایش عناصر خاکی نادر سبک (LREE) نسبت به عناصر خاکی نادر سنگین (HREE) با حفظ الگوی ناشی از فرورانش است و این الگوی غنی شدگی، میتواند نشان دهنده حضور گارنت در خاستگاه باشد. بر پایهی الگوهای عناصر کمیاب بهنجار شده نسبت به کندریت، گوشته اولیه و بازالت‌های پشته میان اقیانوسی، سنگ‌های مورد بررسی از گوه‌ی گوشته‌ای ناشی شدهاند که طی فرورانش غنی گردیده است. قرارگیری نمونهها در گسترههای قوس آتشفشانی و کرانه اقیانوسی نشان میدهد که سنگها در اثر فعالیتهای در ارتباط با فرورانش نئوتتیس شکل گرفتهاند و دادهها وجود ماگماهای متمایز از یک گوه گوشته دگرنهاده شده و غنی شده را برای خاستگاه سنگها نشان میدهد. نتایج بررسیها نشاندهنده دگرگونیهای پیچیده ماگمایی، نقش فرورانش، دگرنهادی گوشته و اثر جدایش و آلودگی پوستهای در تشکیل این سنگها هستند.

کلیدواژه‌ها

عنوان مقاله [English]

Mineralogy and geochemistry of igneous rocks of Josh-e-Rostagh Mountain, southeast of Darab

نویسندگان [English]

Ruhollah Shafiei ¹
Mohammad Poosti ¹
Gholamreza Ghadami ¹
Mohammad Fadaeian ²

¹ University of Hormozgan

² Payame Noor University

چکیده [English]

The study area is located in Fars Province, southeast of Darab, and within the Sanandaj-Sirjan structural zone. The region primarily consists of Mesozoic basalts and andesites. Petrographic studies reveal that andesitic rocks mainly comprise phenocrysts of plagioclase and amphibole, whereas basalts, in addition to plagioclase, contain phenocrysts of pyroxene and olivine. Geochemical evidence confirms tholeiitic to calc-alkaline magmatic series, exhibiting decreasing trends of Al2O3, CaO, MgO, and Fe2O3 versus SiO2. Trace element patterns and their behaviour reflect the influence of fractional crystallization processes. Positive Nb anomalies and REE enrichment patterns indicate mantle metasomatism, suggesting a negligible contribution from the crust in magma genesis. Rare earth element data demonstrates the fractionation of LREEs relative to HREEs, preserving the imprints related to subduction, with the resulting REE enrichment pattern perhaps suggesting the presence of garnet in the source region. Spider diagram patterns indicate that the studied rocks are derived from a mantle wedge enriched during subduction. The placement of samples in volcanic arc and oceanic margin zones implies that the rocks formed due to processes related to the Neo-Tethys subduction. Data generally indicate complex magmatic evolution and an arc magmatic origin that involved metasomatized mantle wedges. Overall results also support a magmatic source and tectonic model based on a model that includes degrees of assimilation, magmatic evolution of magma chamber for basalt, and degrees of crystalizing the upper rock. The model contains all degrees of assimilation crustal. degrees magma chamber volume fraction crystallization. This work contributes to knowledge in geology, as a science to model natural processes in Sanadaj Sirijan rock as the area been selected, due to several and numerous volcano rocks are located with more research data will lead in arc models near earth.

کلیدواژه‌ها [English]

Mineralogy
geochemistry
igneous rocks
Josh-e-Rostagh
Darab
Fars

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