fa ارتباط کانی‌شناسی اولیژیست‌ها و کوارتزهای سازند آغاجاری با سری هرمز در منطقه‌ی سیاهو هرمزگان تحلیل فضایی عوامل فرساینده، و استخراج الگوهای پراکندگی و انتشار فرسایش مستخرج از پایان‌نامه / رساله / طرح پژوهشی <strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">سازند آغاجاری با سن میوسن میانی تا پلیوسن، آخرین واحد گروه فارس است. سنگ</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">رخساره</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">های شناخته شده در نهشته</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">های این سازند شامل ماسه</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">سنگ آهکی، مارن، آهک و سیلتستون آهکی است. ستبرای این سازند در برخی از مناطق پس</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">خشکی بندرعباس به بیش از </span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:11.0pt;">3000</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;"> متر هم می</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">رسد. مطالعات صحرایی و میکروسکوپی روی </span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:11.0pt;">50</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;"> نمونه</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">ی برداشت شده از این سازند در محدوده</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">ی مورد پژوهش و نمونه</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">های گرفته شده از سری هرمز (مربوط به چند گنبد) نشان می</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">دهد که این سازند دارای دانه</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">های آواری (عمدتاً کوارتز پلی</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">کریستالین و کوارتزهای با خاموشی موجی)، خرده</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">های سنگواره</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">ها</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">، کانی</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">های تیره (اکسید و هیدروکسیدهای آهن)، آلبیت، ارتوکلاز و کانی</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">های فرعی مسکویت و کلریت است که همگی در یک زمینه</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">ی آهکی قرار دارد. آزمایش</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">های</span></span></strong><strong><span dir="LTR"><span style="font-size:11.0pt;">XRF</span></span></strong> <strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">&nbsp;و میکروپروب سه نمونه از اولیژیست</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">های موجود در سازند آغاجاری و سری هرمز، بیانگر این است که منشأ اولیژیست</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">ها احتمالاً به فرسایش سری هرمز بازمی</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">گردد. فراوانی کوارتزهای دارای خاموشی موجی در سازند آغاجاری نیز منشأ دگرگونی را برای آنها نشان می</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">دهد و احتمالاً توسط عوامل حمل و نقل از پهنه</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">ی ساختاری سنندج </span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:12.0pt;">ـ</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;"> سیرجان به این حوضه</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">ی رسوبی منتقل شده</span></span></strong><strong><span dir="LTR"><span style="font-size:12.0pt;">‌</span></span></strong><strong><span style="font-family:b compset;"><span style="font-size:12.0pt;">است.</span></span></strong> <strong>Extended abstract</strong><br> 1- Introduction<br> <span dir="LTR">Aghajari Formation as the last unit of Fars Group cropps out in Hormuzgan Province with a considerable thickness. This Formtion is composed of red sandstones and green to reddish grey silty marls. </span><span dir="LTR">According to Kalantari (1992), this formation has the age range of Middle</span><span dir="LTR"> Miocene to Pliocene. The thickness of this formation reaches to 3000m in northern Bandar Abbas (Gholamalian, 2012). The great thickness, broad expansion, slothness (with attention to the calcareaus matrix) and presence of some amounts of Iron rich minerals as grains are charactristics of this formation mineralogical composition. Also, these rocks contain polycrystalline quartz, wavy extinction quartz, fossil fragments and some minor minerals such as moscuvite, chlorite, albite, orthoclase in addition to oligiste. In order to identify the origin of the mentioned minerals; several samples are studied by microscope and Some are processed</span><span dir="LTR"></span><br> by chemical analysis. In addition, the origin of oligiste particles in was considered; so, some samples containing this mineral were collected from Hormuz Series of Siahoo, Anguran, Zendan and Hormuz salt diapirs.<br> 2- Methodology<br> <span dir="LTR">The studied area is located in 74 km North of Bandar Abbas, near the Siahoo and Aghasin villages. We should </span><span dir="LTR">Go</span><span dir="LTR"> 64 km northward from Bandar Abbas and then 10 km eastward in order to access the studied section. The studied section is approximately 4 km before the Aghasin village. Fifty samples were collected from Aghajari Formation and Hormuz Series for </span><span dir="LTR"></span><br> &nbsp;the sake of this study; 22 of them were for chemical analysis and 20 for microscopic thin and polished sections. Three oligiste samples are collected from salt domes for comparison to the Iron rich mineral grains of Aghajari Formation. Oxidic and elemental XRF analysis of samples performed on 22 samples. In addition, point analysis of microprobe exercises are done on the rock forming grains of Aghajari Formation and Hormuz salt plug oligisites with XRF method. Thin and polished sections are studied by polarizan and reflective micoscopes.<br> 3- Results<br> Microscopic investigations on the thin sections of Aghajari Formation Showed the mineralogical content of rocks. Average mineralogical component of grains in this sandstones includs %45 to %50 quartz (%20 wavy extinction quartz and %25 to %30 polycrystalline quartz), less than %10 albite and orthoclase, %3 to %5 black oligiste and %30 to %35 calcareous matrix.<br> Quartz is the main mineral in the grains. Polycrystalline and wavy extinction quartzes can generally form in metamorphic phases. On the other hand, angular to semi-rounded quartz <strong>Grains</strong> show short distance transportation. It seems these quartz grains are originated from the Sanandaj &ndash; Sirjan metamorphic belt rocks. Weak mineralogy and grain size sorting and high thickness of Aghajari Formation show fast sedimentation and short distance transportation of grains. On the other hand, comparison of microprobe spot XRF analysis of oligiste grains shows the chemical composition similarity of this mineral in Hormuz series and <strong>Aghajari</strong> Fomation sandstones. So, these mineral grains are transported from Hormuz series salt plugs to the sedimentary environment during deposition of Aghajari Fomation in the Late Miocene to the Pliocene.<br> 4- Discussion & Conclusions<br> Results of XRF analysis, microprobe and microscopic investigations prove the presence of Fe₂O₃ as oligiste grains in the Aghajari Formation sandstones. Results of point analysis of these particles are similar to those of Hormuz series; showing the probable origin of oligiste particles in the sandstones. A large amount of quartz is present in the Aghajari Formaion sandstones that cannot be transported from salt plugs, because there are a few amounts of this mineral in the Hormuz Series.<br> Wavy extinction quartz grains are abundant in the Aghajari Formation sandstones and have been originated from Sanandaj - Sirjan metamorphic belt.<br> Presence of some mineral particles such as: albite, moscuvite, and chlorite in the Aghajari sandstones prove short distance transportation, probably from the Sanandaj - Sirjan metamorphic belt.<br> In fact, Aghajari sandstone particles are synchronously transported from two main sources; Sanandaj - Sirjan metamorphic rocks are the origin of quartz grains and oligiste fragments are originated from the Zagros Range salt domes. اولیژیست, کوارتز, سازند آغاجاری, سری هرمز, سنندج ـ سیرجان, منشأیابی Oligiste, Quartz, Aghajari Formation, Hormuz Series, Sanandaj – Sirjan, origin determination 45 61 http://magazine.hormozgan.ac.ir/browse.php?a_code=A-10-554-2&slc_lang=fa&sid=1 Mohammad Poosti محمد پوستی m.poosti@yahoo.com 10031947532846004964 10031947532846004964 Yes Assistant Professor, Department of Geology, Faculty of Sciences, University of Hormozgan گروه زمین‌شناسی، دانشکده‌ی علوم پایه، دانشگاه هرمزگان Hossein_ Gholamalian حسین غلامعلیان hossein_gholamalian@yahoo.com 10031947532846004965 10031947532846004965 No Associate professor, Department of Geology, Faculty of Sciences, University of Hormozgan گروه زمین‌شناسی، دانشکده‌ی علوم پایه، دانشگاه هرمزگان