عوامل برهم زننده توالی رسوبات هولوسن در خلیج فارس

نویسندگان

1 استادیار پژوهشگاه ملی اقیانوس‌شناسی و علوم جوی، تهران، ایران

2 دانشیار مرکز ملی تحقیقات علمی فرانسه (CNRS)، فرانسه

چکیده

خلیج­فارس از بارزترین جلوه‌های افزایش تراز اقیانوس‌های جهان در پسایخبندان است. از همین رو، مطالعه رسوبات هولوسن خلیج­فارس از اهمیت بالایی برای بازسازی تغییرات محیطی پسایخبندان برخوردار است. درک توالی صحیح حوادث اقلیمی و اقیانوس‌شناختی پس از یخبندان نیازمند شناخت عواملی است که موجب برهم خوردن یا جابجایی توالی رسوبات هولوسن خلیج­فارس شده‌اند. به این منظور، از دو مغزه کوتاه در خلیج­فارس و تنگه هرمز بهره بردیم که سن‌سنجی آن­ها نشان‌دهنده به‌هم‌ریختگی توالی آن­ها است. این مغزه­ها با استفاده از دستگاه مغزه­گیر وزنی از عمیق­ترین بخش­های خلیج­فارس و تنگه هرمز گرفته شدند. مطالعات رسوب‌شناسی با هدف تعیین اندازه ذرات، مقدار ماده آلی و مقدار کربنات انجام شد و برای تشخیص تغییرات ظاهری از عکسبرداری با رزولوشن بالا استفاده شد. تصاویر اشعه­ایکس از مغزه‌ها برای بررسی تغییرات بافتی در توالی رسوبات مورد استفاده قرار گرفت. نتایج نشان‌ داد که پدیده معکوس‌شدگی سن در مغزه تنگه هرمز به دفعات رخ داده است. به نظر می‌رسد آبگونگی ناشی از زمین‌لرزه و احتمالاً خروج گاز از بستر دریا عوامل مهم برهم‌زننده‌ی توالی رسوبات در تنگه هرمز هستند. در مغزه خلیج­فارس نتایج حاکی از دو پدیده معکوس‌شدگی سن و نبود رسوب­گذاری است. بررسی‌ها نشان می‌دهد که این دو پدیده به دلیل زیست‌آشفتگی رسوبات بستر خلیج­فارس روی داده­اند. پیشنهاد می‌شود پیش از شروع مطالعات جامع و انجام تفاسیر مرتبط برای بازسازی ‌محیط دیرینه، مطالعات رسوب‌شناسی با هدف تعیین میزان به‌هم‌ریختگی توالی رسوبات مورد توجه قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Causes of disturbances in the Persian Gulf ‘s Holocene sedimentary sequences

نویسندگان [English]

  • A. Naderi Beni 1
  • M. Jamali 2
1 Assist. Prof., Iranian National Institute for Oceanography and Atmospheric Sciences (INIOAS), Tehran, Iran
2 Assoc. Prof., Institut Méditerranéen de Biodiversité et d'Ecologie (CNRS), France
چکیده [English]

The Persian Gulf is one of the most prominent postglacial landscape changes in the world. The basin has recorded the Holocene climate changes and sea level fluctuations in its sedimentary sequences. Therefore, the study of the Persian Gulf’s Holocene sediments is of great importance. Understanding the postglacial climatic and oceanographic condition requires the discrimination of post-depositional disturbances from syn-depositional processes that are controlled by climatic and oceanographic conditions. In this regard, we used two short sediment cores obtained from the deepest parts of the Persian Gulf (PG) and Strait of Hormuz (SH) using a gravity corer to investigate the most important disruptors of the Holocene sedimentary sequences. Sedimentological studies along with X-ray images and high-resolution photographs were implemented on two well radiocarbon-dated short sediment cores. The radiocarbon results show that the sediments are disturbed in both cores. The SH core shows repeated age reversal and evidence of liquefaction. The PG core, on the other hand shows evidence of age reversal on top and a hiatus at the base. We assumed that the late-Holocene SH sedimentary sequence is more prone to be disturbed by earthquake while gas venting and relatively strong bottom currents are also influential. On the other side, bioturbation is more responsible for sediment disturbances in PG during the Mid to late Holocene. It is suggested that before starting comprehensive studies on the PG sediments, sedimentary structures are investigated to determine any disturbances in the sequence.

کلیدواژه‌ها [English]

  • Sedimentology
  • Tsunami
  • Bioturbation
  • Paleo-environment
  • Earthquake

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  • تاریخ دریافت: 21 اردیبهشت 1401
  • تاریخ بازنگری: 02 مرداد 1401
  • تاریخ پذیرش: 12 مرداد 1401

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