سامانه مدیریت نشریات علمی دانشگاه شهید بهشتی

نیمروزی, عاطفه, قدمی, غلامرضا, حسن زاده, جمشید, پوستی, محمد. (1399). شواهد بازشدگی تریاس نئوتتیس در زون سنندج- سیرجان با توجه به شواهد پتروگرافی، ژئوشیمی و مطالعات سن سنجی، منطقه اسفندآباد یزد. , 11(3), 133-148. doi: 10.52547/esrj.11.3.133
عاطفه نیمروزی; غلامرضا قدمی; جمشید حسن زاده; محمد پوستی. "شواهد بازشدگی تریاس نئوتتیس در زون سنندج- سیرجان با توجه به شواهد پتروگرافی، ژئوشیمی و مطالعات سن سنجی، منطقه اسفندآباد یزد". , 11, 3, 1399, 133-148. doi: 10.52547/esrj.11.3.133
نیمروزی, عاطفه, قدمی, غلامرضا, حسن زاده, جمشید, پوستی, محمد. (1399). 'شواهد بازشدگی تریاس نئوتتیس در زون سنندج- سیرجان با توجه به شواهد پتروگرافی، ژئوشیمی و مطالعات سن سنجی، منطقه اسفندآباد یزد', , 11(3), pp. 133-148. doi: 10.52547/esrj.11.3.133
نیمروزی, عاطفه, قدمی, غلامرضا, حسن زاده, جمشید, پوستی, محمد. شواهد بازشدگی تریاس نئوتتیس در زون سنندج- سیرجان با توجه به شواهد پتروگرافی، ژئوشیمی و مطالعات سن سنجی، منطقه اسفندآباد یزد. , 1399; 11(3): 133-148. doi: 10.52547/esrj.11.3.133

شواهد بازشدگی تریاس نئوتتیس در زون سنندج- سیرجان با توجه به شواهد پتروگرافی، ژئوشیمی و مطالعات سن سنجی، منطقه اسفندآباد یزد

پژوهشهای دانش زمین
مقاله 8، دوره 11، شماره 3 - شماره پیاپی 43، 1399، صفحه 133-148    اصل مقاله (1.06 M)
نوع مقاله: مقاله پژوهشی
شناسه دیجیتال (DOI): 10.52547/esrj.11.3.133
نویسندگان
عاطفه نیمروزی1؛ غلامرضا قدمی* 1؛ جمشید حسن زاده2؛ محمد پوستی1
1گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه هرمزگان، بندرعباس، ایران
2موسسه تحقیقاتی پاساد، کالیفرنیا، آمریکا
چکیده
تاریخچه تکاملی زون سنندج-سیرجان، تحت‌تاثیر دو رژیم کششی و فشارشی بوده که باعث ایجاد بازشدگی، فرورانش، تصادم و بسته شدن نهایی آن شده است. این پژوهش با استناد به مطالعات پتروگرافی، ژئوشیمی و همچنین داده‌های سن سنجی سنگ‌های آتشفشانی منطقه اسفندآباد یزد، شواهدی از باز شدگی و ولکانیسم حاصل از آن را در اختیار قرار می‌دهد. توالی مورد مطالعه شامل گدازه‌های تیره رنگ آندزیتی، ریولیتی و بازالتی همراه با میان لایه‌های آذرآواری همراه با واحدهای رسوبی است. در مقاطع میکروسکوپی، کانی‌های اصلی تشکیل دهنده در سنگ‌های آندزیتی به ترتیب فراوانی شامل پلاژیوکلاز، پیروکسن و کوارتز، در سنگ‌های ریولیتی پلاژیوکلاز، فلدسپار آلکالن و کوارتز و در بازالت‌ها شامل پلاژیوکلاز، اولیـوین و پیروکسـن است. براساس داده‌های ژئوشیمیایی، سنگ‌های مورد مطالعه دارای ترکیب شیمیایی بازالتی و تراکی داسیتی با گرایش کالک آلکالن و توله ایتی می‌باشند. همچنین نمودارهای تعیین جایگاه تکتونیکی محیط درون صفحه‌ای را در تشکیل آنان تایید می‌نماید. مطالعات ژئوشیمیایی نشان داد که سنگ‌های تراکی داسیتی حاصل 5% ذوب بخشی یک منشا گارنت-لرزولیت و سنگ‌های بازالتی حاصل20 % ذوب بخشی یک منشا اسپینل-لرزولیتی می‌باشند. مطالعات سن سنجی براساس زیرکن‌های موجود در سنگ‌های تراکی داسیتی به روش اورانیوم-سرب سن 6/6 +240 معادل با تریاس زیرین را برای این بازشدگی ارائه داده است که با بازشدگی و تشکیل اقیانوس نئوتیس در پرموتریاس مطابقت می‌کند. 
کلیدواژه‌ها
اسفندآباد؛ سنندج-سیرجان؛ باز شدگی؛ نئوتتیس؛ یزد
عنوان مقاله [English]
Evidence of triassic neotethys opening in Sanandaj_Sirjan zone, according to petrographic, geochemical and geochronological studies, in Esfandabad region of Yazd
نویسندگان [English]
Atefeh Nimroozi1؛ gholamreza ghadami1؛ Jamshid Hassanzadeh2؛ Mohammad Posti1
1Department of Geology, Faculty of Sciences, University of Hormozgan, Bandar Abbas, Iran
2Pasadena California Institute of Technology, California, USA
چکیده [English]
Introduction
The evolutionary history of the Sanandaj-Sirjan zone has been influenced by two extensional and
compressional regimes that have caused rifting, subduction, collision and its final closure. The study area is
located in Esfandabad city of Yazd province. The sequence contains dark colored andesitic, rhyolitic and
basaltic lava with interlayers of volcanoclastic and sedimentary units. The volcanic rocks detected contain
aphanitic textures and have dark gray to black color with oxidized surface, fractures and pores. These
volcanic rocks have a layered flow and are mostly seen as dome-shaped structures and are sometimes in the
form of dikes. Another characteristic of this group of rocks is the green color obtained from the secondary
minerals of chlorite and epidot, as a result of the alteration applied to them. The volcanoclastic rocks are
mainly fine-grained and welded purple tufts.
Materials and Methods
In order to achieve the aim of this study, after descriptive studies, field operations were performed in three
stages and 100 samples were taken from the desired outcrops and thin sections were prepared. After
petrographic studies, less altered samples were selected and sent to the GeoLeb Laboratory in Canada for
geochemical analyzing using XRF, ICP-MS and ICP-IAS methods. Age studies have been conducted at the
Caltech Institute in California.
Results and Discussion
In microscopic studies, the dominant texture in basaltic rock is porphyry, consisting of plagioclase, olivine
and pyroxene in a fine-grained matrix composed of plagioclase, epidote, chlorite, sphene and opaque
minerals. Andesitic rocks have microporphyric and seriate textures consisting of plagioclase, in a fine
grained matrix consisting of plagioclase, pyroxene, quartz, epidote, carbonate and chlorite alteration
products and opaque minerals. Rhyolite rocks have a microcrystalline to hyalline texture consisting of quartz,
alkali feldspar and plagioclase. Evidence such as sosoritization of plagioclase, filling of cavities by chlorite
and zeolite, idingitizated or chlorinated olivine and uralite pyroxene crystals indicate the performance of
metamorphic phenomena in the studied rocks.
Conclusion
In microscopic studies, the dominant texture in basaltic rock is porphyry, consisting of plagioclase, olivine and
pyroxene in a fine-grained matrix composed of plagioclase, epidote, chlorite, sphene and opaque minerals.
Andesitic rocks have microporphyric and seriate textures consisting of plagioclase, in a fine grained matrix
consisting of plagioclase, pyroxene, quartz, epidote, carbonate and chlorite alteration products and opaque
minerals. Rhyolite rocks have a microcrystalline to hyalline texture consisting of quartz, alkali feldspar and
plagioclase. Evidence such as sosoritization of plagioclase, filling of cavities by chlorite and zeolite, idingitizated
or chlorinated olivine and uralite pyroxene crystals indicate the performance of metamorphic phenomena in the
studied rocks.
کلیدواژه‌ها [English]
Esfandabad, Sannandaj-Sirjan, Opening, Neotethys, Yazd
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