Biostratigraphy of the Bazehowz Formation at its Type section, South West Mashhad based on plant macrofossils

Document Type: Research Paper

Authors

1 Department of Geology, University College of Science, University of Tehran, Tehran, I.R.Iran

2 Department of Geology, Mashhad Branch, Islamic Azad University, Mashhad, I.R. Iran

10.7508/GEOP.2015.01.004

Abstract

Jurassic deposits are well exposed in the Bazehowz area, South west of Mashhad city, East Alborz, Iran. It contains plant macrofossils
belonging to eighteen species of eleven genera of various orders such as Equisetales, Filicales, Bennettitales, Cycadales,
Corystospermales, Caytoniales, Ginkgoales and Pinales. Two biozones were recognized in the type section of Bazehowz Formation.
Biozone I is an assemblage biozone with its lower and upper boundaries identified by first observed occurrence (FOO) and the last
observed occurrence (LOO) of Nilssonia rigida, Nilsssonia sp. cf. N. bozorga and Nilssonia feriziensis. Since there are species from
Liassic such as Nilssonia rigida and uppermost Liassic such as Nilssonia feriziensis and Nilssonia sp. cf. N. bozorga, a Toarcian age
is suggested for this biozone. Biozone II is an interval zone with its lower and upper boundaries identified by FOO of Klukia exilis and
Ptilophyllum vasekgahenses and Coniopteris hymenophylloides and Ctenozamites cycadea, respectively. According to occurrence of
Klukia exilis, a lowermost Middle Jurassic age is suggested for the lower boundary and based on the occurrence of Coniopteris
hymenophylloides Aalenian age is considered for upper boundary of Biozone II. On the basis of relative abundance of Filicales
(%16.6), Bennettitales (%27.7) and Cycadales it is considered a humid sub-tropical climate for this period of time.

Keywords


Article Title [Persian]

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

Authors [Persian]

  • فاطمه واعظی جوادی 1
  • محسن علامه 2
1 دانشگاه تهران، پردیس علوم، دانشکده زمین شناسی
Abstract [Persian]

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.

Keywords [Persian]

  • زیست چینه نگاری
  • ماکروفسیل های گیاهی
  • ژوراسیک
  • سازند بازه حوض
  • البرز
  • ایران
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