دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

بررسی اقلیم دیرینه در رسوبات دریاچه‌ای بر اساس مطالعات بقایای بیولوژیکی در طول هولوسن پسین (زاگرس چین‌خورده)

نویسندگان
1 استادیار گروه زمین‌شناسی، دانشگاه پیام‌نور، تهران، ایران
2 دکترا ژئومورفولوژی، سازمان زمین‎شناسی و اکتشافات معدنی کشور، تهران، ایران
چکیده
منطقه مورد مطالعه در شمال‌خاوری استان خوزستان و در دامنة ارتفاعات زاگرس چین‏خورده و در تقسیم‏بندی ژئومورفولوژیکی در زیرواحد ایذه واقع شده است. موضوع پژوهش حاضر بررسی تاریخچة رسوب‌گذاری، تغییرات اقلیم دیرینه و شناسایی دوره‏های خشک و مرطوب در بازه زمانی هولوسن پسین است. در این پژوهش یک مغزة ‏رسوبی دست‏نخورده با ژرفای 720 سانتی‌متر از رسوبات زیر بستر دریاچه چگارمان با استفاده از مغزه‏گیر دستی برداشت و مورد بررسی و تحلیل قرار گرفت. باتوجه به مطالعات رسوب‌شناسی، بررسی فراوانی و نوع بقایای بیولوژیکی، شناسایی تحولات اقلیمی و محیطی در منطقه صورت گرفت. نرخ رسوب­گذاری در این دریاچه براساس مطالعات درویشی و همکاران (1398) در تالاب آبزالو با فاصله حدود 10 کیلومتر از دریاچه چگارمان، حدود 4/1 میلی‏متر در سال گزارش شده است. با وجود این، میزان رسوب‌گذاری برای ژرفاها و زمان‌های مختلف متفاوت است، لذا سن‌های ارائه شده در این مقاله بصورت تقریبی است. در توالی رسوبی بررسی ‌شده، دستکم دو دورة مرطوب تا نسبتا مرطوب، از حدود 4 هزار تا 3100 سال پیش و 1250 تا 200 سال پیش و دو دوره خشک از حدود 4500 تا 4300 سال پیش (گرم و خشک) و از حدود 3100 تا 1250 سال پیش (سرد و خشک) در طول هولوسن پسین شناسایی شده است. شدیدترین دوره خشک از حدود 4500 تا 4300 سال پیش در ابتدای هولوسن پسین رخ داده است. با توجه به تغییر نوع رخساره‏های رسوبی، دوره خشک یک‌باره در منطقه ظاهر شده و به صورت تدریجی به ‏پایان رسیده و دوره‏های مرطوب به‌تدریج شروع شده و ناگهان پایان پذیرفته‌اند. دوره‏ خشک نسبت به دوره‏های مرطوب با شدت بیشتر و مدت زمان کوتاه‏تر در منطقه ظاهر شده‏اند.
کلیدواژه‌ها

عنوان مقاله English

Paleoclimate in Lake Sediments according to biological remains studies during Late Holocene (Folded Zagros)

نویسندگان English

H. Noroozpour 1
J. Darvishi Khatooni 2
1 Assist. Prof., Dept., of Geology, Payame Noor Unvierstiy, Tehran, Iran
2 Ph. D., in geomorphology, Geological survey of Iran, Tehran, Iran
چکیده English

The studied area is located in the northeast of Khuzestan province and in the range of the folded Zagros highlands and is located in the sub-unit of Izeh in geomorphological division. Investigating the history of sedimentation, paleoclimate changes and identifying dry and wet periods in the late Holocene period is the subject of this research. In this research, an intact sedimentary core with a depth of 720 cm was taken from the bed sediments of Chegarman Lake by hand corer. Sedimentary facies were identified based on the texture, structure and size of sediments, organic matter, color, plant and animal remains, and other macroscopic components. According to the sedimentological studies, type of biological remains, the climatic and environmental changes of the region was investigated. According to previous studies (Darvishi khatooni et al., 2019) in this sedimentary-structural zone, the sedimentation rate is about 1.4 mm per year. But the sedimentation rate is different for different depths and times. In the studied sedimentary sequence, at least two wet periods, from about 4000 to 3100 (BP) and 1250 to 200 (BP) and two dry periods about 4500-4300 (BP) (warm and dry) and about 3100 to 1250 (BP) (cold and dry) were identified during the late Holocene (last 5000 years). The most severe dry period, the dry period about 4500-4300 (BP), occurred at the beginning of the late Holocene. The dry period appeared suddenly in the region and ended gradually, and the wet periods started gradually and ended suddenly. Dry periods have appeared in the region great and shorter than wet periods.

کلیدواژه‌ها English

Climate changes
Izeh subzone
Sedimentary core
Sedimentology
late Quaternary
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  • تاریخ دریافت 26 تیر 1403
  • تاریخ بازنگری 08 آذر 1403
  • تاریخ پذیرش 14 آذر 1403