زیست چینه نگاری سازند بازه حوض در برش نمونه، جنوب غرب مشهد بر اساس ماکروفسیل های گیاهی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تهران، پردیس علوم، دانشکده زمین شناسی

2 دانشگاه ازاد مشهد

چکیده

نهشته های ژوراسیک در منطقه بازه حوض واقع در جنوب غربی شهر مشهد، البرز شرقی بخوبی رخنمون دارد. این سازند دربردارنده 18 گونه ماکروفسیل های گیاهی متعلق به 11 جنس از راسته های اکویی ستال ها، فیلیکال ها، بنتیتال ها، سیکادال ها، کوریستوسپرمال ها، کی تونیال ها، گینکگوآل ها و پاینال ها است که برای اولین بار معرفی می شوند. دو زیست زون در برش نمونه سازند بازه حوض شناسایی گردید. زیست زون I یک افق تجمعی است. مرزهای زیرین و بالایی این زیست زون بر اساس اولین و آخرین حضور (FOO, LOO) گونsه های Nilssonia rigida، Nilssonia sp. cf. N. bozorga و Nilssonia feriziensis تعیین می گردد. با توجه به حضورگونه هایی با سن لیاس از جمله Nilssonia rigida وگونه هایی متعلق به بالایی ترین بخش لیاس نظیر Nilssonia feriziensis و Nilssonia sp. cf. N. bozorga، سن توآرسین برای این زیست زون خاطرنشان می شود. زیست زون II یک افق فاصله ای (اینتروال) می باشد. مرز زیرین آن با اولین حضور (FOO) گونه های Klukia exilis و Ptilophyllum vasekgahense و مرز بالایی آن با اولین حضور گونه های Coniopteris hymenophylloides و Ctenozamites cycadea تعیین می گردد. بر اساس حضور گونه Klukia exilis سن آغازی ترین بخش ژوراسیک میانی برای مرز پایینی و بر اساس حضور گونه Coniopteris hymenophylloides سن آالنین برای مرز بالایی زیست زون II خاطرنشان می شود. بر مبنای فراوانی نسبی فیلیکال ها (6/16%)، بنتیتال ها (7/27%) و سیکادال ها (7/27%)، آب و هوای مرطوب و نیمه گرمسیری برای این بازه زمانی در این منطقه خاطر پیشنهاد می گردد.

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