رخسارههای نهشتههای میوسن در جنوب هرسین، زاگرس مرتفع | ||
| پژوهشهای دانش زمین | ||
| دوره 13، شماره 2 - شماره پیاپی 50، 1401، صفحه 143-161 اصل مقاله (2.07 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.48308/esrj.2022.102055 | ||
| نویسندگان | ||
| اصغر روز پیکر1؛ دکتر مغفوری مقدم* 1؛ مهدی یزدی2؛ بیژن یوسفی1 | ||
| 1گروه زمینشناسی، دانشکده علوم، دانشگاه لرستان، خرم آباد، ایران | ||
| 2گروه زمینشناسی، دانشکده علوم، دانشگاه اصفهان، اصفهان، ایران | ||
| چکیده | ||
| محتویات روزنداران و رخسارههای توالی میوسن در سه برش در مموله، سیل چشمه و زرده سوار در جنوب هرسین در پهنه زاگرس مرتفع انتخاب و مورد نمونهبرداری و بررسی قرار گرفتند. نتایج حاصل از دادههای تاکسونومیک، محدوده چینهنگاری و حضور روزنداران کفزی و شناور منجر به شناسایی 4 پهنه زیستی گردید. این پهنهها عبارتند از: 1)Indeterminate Zone I; 2) SBZ25 (Miogypsina globulina subzone, Miogypsina intermedia zone); 3) Indeterminate Zone II; 4) Orbulina suturalis Interval Zone. با استفاده از پهنهبندی های زیست-زمانی زیرسیستم نئوژن در قلمرو تتیس، سن نسبی این نهشتهها بوردیگالین- لانگین پیشنهاد میگردد. بررسی پتروگرافی، رخسارهها، مشاهدات صحرایی و مطالعه پخش و انتشار روزنداران منجر به شناسایی 7 رخساره در 4 کمربند رخسارهای مربوط به محیط لاگون، مجموعه رخسارهای حاشیه، مجموعه رخسارهای دامنه شیب بالایی و مجموعه رخسارهای دامنه شیب پایینی شناسایی گردید. وجود ریفهای مرجانی سدی، تغییر ناگهانی رخسارهها و نبود پهنههای وسیع جزر و مدی نشان میدهد که این نهشتهها در یک پلاتفرم کربناته لبهدار از نوع شلف نهشته شدهاند. | ||
| کلیدواژهها | ||
| بوردیگالین؛ رخساره؛ روزنبران کفزی بزرگ؛ زاگرس رورانده؛ لانگین | ||
| عنوان مقاله [English] | ||
| Facies of Miocene deposits in south of Harsin, High Zagros | ||
| نویسندگان [English] | ||
| Asghar Roozpeykar1؛ Iraj Maghfouri Moghaddam1؛ Mehdi Yazdi2؛ Bizan Yousefi1 | ||
| 1Department of Geology, Faculty of Science, Lorestan University, Khoramabad, Iran | ||
| 2Department of Geology, Faculty of Science, Isfahan University, Isfehan, Iran | ||
| چکیده [English] | ||
| Introduction Lower Miocene deposits in Iran have a significant expansion. In Zagros and Central Iran, these sediments include Asmari and Qom formations, respectively. Due to its economic importance and especially the possibility of reservoir and cap rocks, many studies have been conducted on the Miocene deposits in areas with high hydrocarbon potential. However, in the high Zagros, due to the limited oil reserves, the Miocene deposits have been less studied. According to the geological map of Harsin in the northern parts of the high Zagros zone (Shahidi and Nazari, 1997), the Miocene deposits consist of carbonate and clastic rocks. In terms of lithology, especially the presence of clastic rocks, these deposits are very similar to the Qom Formation, but since they are located in the high Zagros zone, it may not be correct to refer to this formation. On the other hand, the lithology and appearance of these deposits are fundamentally different from the Asmari Formation. Therefore, in this paper, like the geological map of Harsin, they are called Miocene deposits. In this paper, the paleoenvironment and microfacies of Miocene deposits in the high Zagros have been studied. Material and methods Three sections of Miocene deposits are studied, located 23 km south of Harsin (Figure 1). Fig. 1. Locality map of the studied area. In the present study, a total of 130 sections were taken. Thin sections were prepared from rock samples and isolated fossils were isolated from soft samples. Texture properties and fossil assemblages in thin sections were examined and identified by a polarizing microscope. Biostratigraphy Based on foraminiferal distribution, the following assemblage zones are recognized: 1) Indeterminate Zone I: In view of the fact that we unable to find any index microfossils, comments on the age of this zone are difficult, which explains why this is here referred to as an indeterminate zone. 2) SBZ25: Larger benthic foraminiferal zone SBZ 25 can be divided into two subzones; those of M. globulina and M. intermedia. 2-a) M. globulina Subzone: This is defined by the FO of M. globulina at the base and the FO of M. intermedia at the top. It is regarded as a common global index for the Burdigalian Stage. 2-b) M. intermedia Subzone: This is defined by the stratigraphical range of M. intermedia, which is considered to be a characteristic form for the middle-upper Burdigalian (Cahuzac & Poignant, 1997). 1) Indeterminate Zone II: In view of the fact that we could not find any index microfossils in this zone, we here refer to it as indeterminate zone. As to its stratigraphical position, we prefer an early Langhian date for this zone. 2) Orbulina suturalis Interval Zone: Planktonic foraminifera are frequent to dominant in the upper part of the Sayl Cheshmeh section. Based on their vertical distribution, a single biozone has been recognized. This is defined by the FO of O. suturalis (Brönnimann, 1951) and ends right below the conglomerate/sandstone levels of Pliocene age Depositional model Based on the field observations, petrographic studies and textural characteristics as well as the abundance and distribution of foraminiferal fauna and other components, 7 carbonate microfacies have been identified. These carbonate microfacies were deposited in4 facies belts including lagoon, margin facies, upper slope facies and lower slope facies (Fig. 2). Fig. 2. Depositional model for the platform carbonate of the Miocene deposits in the Harsin area, High Zagros Zone The stratigraphical position and vertical and lateral dispersion of different facies along with textural features and skeletal composition, and the presence of coral reef reefs and sudden change of facies and the absence of large tidal zones of Miocene deposars in Harsin area indicate that this sequence deposited on a rimmed carbonate platform. | ||
| کلیدواژهها [English] | ||
| High Zagros, Burdighalian, Langhian, Facies, larger benthic foraminifera | ||
| مراجع | ||
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