بوم شناسی دیرینه و بررسی های تافونومیک(حوادث پس از دفن شدگی ) خارپوستان سازند کژدمی (آلبین- سنومانین) در برش فیروزآباد، حوضه زاگرس
محورهای موضوعی : زمین شناسی نفت
بابک صدقی
1
(دانشجوی دکتری چینه شناسی و فسیل شناسی گروه زمین شناسی دانشگاه اصفهان، اصفهان، ایران)
علی بهرامی
2
(دانشگاه اصفهان)
مهدی یزدی
3
(استاد دانشگاه)
کلید واژه: کژدمی, خارپوستان, حوادث پس از مرگ, , اپی فونا, گنبد نمکی,
چکیده مقاله :
در این تحقیق نهشته های سازند کژدمی از دیدگاه حوادث پس از مرگ (postmortem) و دفن شدگی (burial) خارپوستان و جغرافیای دیرینه نهشته ها مورد بررسی قرار گرفته است. از حدود 150 نمونه فسیل شده خارپوستان این برش که شامل 10 جنس و 13 گونه ی Coenholectypus neocomiensis, Phymosoma binexilis, Dorocidaris taouzensis, Cottaldia aff. Benettiae, Leptosalenia sergipensis, Phymosoma baylei, Micropedina olisiponensis, Tetragramma deshayesi, Macraster douvillei, Mecaster batnensis, Macraster obtritus, Pliotoxaster comanchei, Macraster sp., Hemiaster sp. می باشند، بخش قابل توجهی از آنها دچار خردشدگی (Disarticulation and fragmentation) ، ترک های شعاعی و تغییر شکل پوسته (test outline distortion and radial cracking) و تغییر حجم و فرسایش زیستی (bioerosion) و سوراخ شدگی توسط کرم های رو زیست (microboring) گردیده اند. البته بعد از تغییر حجم، شکستگی و یا فشردگی تافونومیکی، محلول‌های موجود (هیدروکربور و محلول های غنی از هیدروکسیدهای آهن، منگنز و گاهی سیلیس) در شکاف‌ها وترک‌های حاصله از این پدیده های فیزیکی جایگزین شده‌اند. پوسته این خارپوستان توسط اپی فونا های همزیست مانند اوسترید ها و گریفه ها بعنوان غذا و جایگاه اتصال رو زیستی و پناهگاه پس از مرگ و دفن شدگی آنها بوده است. بنظر می رسد تغییر حجم، خرد شدگی، تزریق محلول و خم شدگی فونا تحت تاثیر فشار تکتونیکی گنبدهای نمکی منطقه و سنگ شناسی نرم (پلاستیسیته بالا) سازند کژدمی بین دو سازند داریان و سروک می باشد
Kazhdumi Formation deposits in Firouzabad section were investigated regarding the postmortem and burial events of echinoderms, from about 150 echinoderm fossils which include 10 genera and 13 species of Coenholectypus neocomiensis, Phymosoma binexilis, Dorocidaris taouzensis, Cottaldia aff. Benettiae, Leptosalenia sergipensis, Phymosoma baylei, Micropedina olisiponensis, Tetragramma deshayesi, Macraster douvillei, Mecaster batnensis, Macraster obtritus, Pliotoxaster comanchei, Macraster sp., Hemiaster sp. most part of them suffer from disarticulation and fragmentation, radial cracks and shell deformation (test outline distortion and radial cracking) and volume change and biological erosion (bioerosion) and perforation by living worms (microboring). Of course, after volume changes, fractures or taphonomic compression, the existing solutions (hydrocarbon and solutions rich in iron, manganese and sometimes silica) hydroxides have been replaced in the cracks. The test of these echinoderms has been used by symbiotic epifauna such as Osterids and Gryphaes as food and attachment points and shelter after their death and burial. It seems that the volume change, crushing, solution injection and fauna bending are influenced by the tectonic pressure of the salt domes of the region and the soft lithology (high plasticity) of the Kazhdami formation between the Darian and Sarvak formations.
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