نوع مقاله : مقاله پژوهشی

نویسندگان

1 پژوهشکده علوم زمین، سازمان زمین‌شناسی و اکتشافات معدنی کشور، تهران، ایران

2 دانشکده زمین‌شناسی، دانشکدگان علوم، دانشگاه تهران، تهران، ایران

3 پژوهشگاه ملی اقیانوس‌شناسی و علوم جوی، تهران، ایران

چکیده

در مطالعه حاضر به منظور بازسازی تغییرات دیرینه محیطی و اقلیمی جیرفت در طول 4000 سال گذشته، به بررسی شواهد متعدد 
رسوب‌شناسی و بیوژئوشیمی بر روی یک مغزه رسوبی پرداخته شده است. در حدود 3950 سال پیش از حاضر مقادیر پایین Si/Al ،Ti/Al،  
C/N و CPI به همراه مقادیر بالای δ13COM و Paq می‌تواند شواهدی از یک دوره مرطوب در جیرفت باشد. شواهد حاکی از کاهش نسبی رطوبت بین حدود 3900 و 3293 سال پیش از حاضر می باشد. در حدود 3293 تا 2897 سال پیش از حاضر جیرفت خشک و گردوغباری بوده است. نتایج شرایط بسیار خشک همراه با افزایش قابل توجه میزان گردوغبار را در حدود 3200 سال پیش از حاضر نشان می‌دهد. یک دوره طولانی مرطوب از حدود 2897 تا 2302 سال پیش از حاضر با مقادیر بالای Paq قابل تشخیص است. بالاترین مقادیر Ti/Al در کنار کمترین مقادیر δ13COM نشان‌دهنده افزایش فعالیت بادی و شرایط خشک بین 2100 و 1650 سال پیش از حاضر است. جیرفت بین 1540 تا 1315 سال پیش از حاضر، شرایط مرطوبی را تجربه کرده است. با کاهش نسبی بارش‌ها، آب‌و‌هوای نیمه‌مرطوب بین 1315 و 854 سال پیش از حاضر در جیرفت حاکم بوده است. 

کلیدواژه‌ها

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