PERMIAN FUSULINACEANS OF THE SURMAQ FORMATION IN THEABADEH REGION, CENTRAL IRAN
PERMIAN FUSULINACEANS OF THE SURMAQ FORMATION IN THEABADEH REGION, CENTRAL IRAN
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DOI：
10.13130/2039-4942/5509
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发表时间：
2003-07
影响因子：
2.3
通讯作者：
F. Kobayashi;K. Ishii
中科院分区：
文献类型：
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作者：
F. Kobayashi;K. Ishii
Fusulina ceans由30属56种组成，有别于分布在伊朗中部Abadeh地区的Surmaq组。其中，对23种进行了系统的描述和讨论，其中包括3个新种：Parafusulina tarazi、Skinnerella abadehensis和Sphaerulina iranensis。为了了解它们广泛的种内变异，并将它们与特提斯地区的其他动物群进行比较，文中提供了许多羽毛藻目动物的显微照片。Surmaq组在生物地层学上自下而上划分为六个带：Darvis ites ulatus、Pseudofusulina quasifusuliniformis、Eopolydiexodina persica、Afurella schencki、Neoschwagerina ocsidentalis和Chusenella abichi。根据特提斯地区中二叠世新二叠世地层分布和新二叠统的动物群对比，第一个带可能是雅克塔什期，第二个带可能是库伯甘甸期，第三个带到第五个带是穆尔加贝期，最后一个带是米甸带。在这六个带中，Schwagerinids占主导地位，而几乎所有的Neoschwagerinids和Verbeekidae都局限于第四和第五带。西南亚和地中海地区中二叠世丝藻目动物群以Surmaq组的动物群为代表，在古地理上可归为A省(西特提斯省)。A省的Fusulina cean动物群与B省(东特提斯省)的很大不同，因为典型的Colania和Lappolina的出现非常罕见，而与C省(潘塔拉桑省)的不同之处在于存在阿富汗菌和苏门答腊菌。
Fusulina ceans consisting of 56 species belonging to 30 genera are distinguished from the Surmaq Formation distributed in the Abadeh region, central Iran. Among them, 23 species, including three species newly proposed: Parafusulina tarazi, Skinnerella abadehensis , and Sphaerulina iranensis , are systematically described and discussed. Many microphotographs of fusulinaceans are illustrated so as to understand their wide intraspecific variation and to compare them with other faunas from the Tethyan regions. The Surmaq Formation is biostratigraphically divided into six zones from lower to upper: Darvasites ordinatus , Pseudofusulina quasifusuliniformis , Eopolydiexodina persica , Afghanella schencki , Neoschwagerina occidentalis , and Chusenella abichi . The first zone is probably Yakhtashian, the second is possibly Kubergandian, the third to fifth are Murgabian, and the last is Midian in age, based on the stratigraphic distribution and faunal correlation of neoschwagerinids and schwagerinids in Middle Permian formations of the Tethyan regions. Schwagerinids are dominant in these six zones, whereas almost all neoschwagerinids and verbeekinids are restricted to the fourth and fifth zones. Middle Permian fusulinacean faunas in South West Asian and Mediterranean Sea regions are well represented by those of the Surmaq Formation, and paleobiogeographically assignable to Province A (Western Tethyan Province). Fusulina cean faunas of Province A are largely different from those in Province B (Eastern Tethyan Province) by the very rare occurrence of typical Colania and Lepidolina , and from Province C (Panthalassan Province) by the presence of Afghanella and Sumatrina .