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塔里木盆地艾克提克群中放射虫化石及其意义
李日俊, 王招明, 买光荣, 吴浩若, 黄智斌, 谭泽金
2002, 23 (6):
496-500.
摘要
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中国南天山西端的艾克提克群是卷入南天山造山带的一个重要的岩石地层单元,其与相邻地层单元均以断 层接触。以往根据在其灰岩和砂质灰岩中发现的Pseudotaffella sp., Profusulinella sp. 和Fusulinella sp.将其归属于上石炭统。我们的放射虫化石发现于托什罕河上游的哈拉道克剖面,主要包括Albillella undulata Deflandre, Albillella paradoxa Deflandre, Alballla sp. aff. A. paradoxa Deflandre, Alallella sp. ef. A. deflandrei Gourmelon, Albillella sp., Albillella excelsa Ishiga, Kito and Imoto (?), Belowea variabilis (Ormiston et Lane), Callella cf. C. parvispinosa Won, Entactinia cf. E. tortispina Ormiston et Lane, Entactinia aff. E. tortispina Ormiston et Lane, Entactinia variospina Won, Entactinia sp., Eostylodictya rota (Won), Latentifistula impella (Ormistone et Lane) (?), Latentifistula turgida Omiston et Lane, Latentifistulidae gen. et. sp. indet. 和Polyentactinia cf. aranea Gourmelon。 其中, Alballella excelsa Ishiga, Kito and Imoto (?)的时 代为晚二叠世(存疑),其余可以划分出早石炭世早期和晚期两个放 射虫化石组合:前者以Albailella undulata Deflandre, Albillella paradoxa Deflandre 和Albillla sp. ef. A. deflamdrei Gourmelon为代表,后者以Eostylodictya rota (Won)为代表。这是艾克提克群中首次发现放射虫化石,同时是在中天山首次发现晚二叠世放射虫化石,也是中国南天山最西部的放射虫化石点,具有重要的地质研究意义。
Abstract: Aiktik group,distributed at the western end of South Tianshan Mountains in China,is an important lithostratigraphic unit involved in south Tianshan orogen. It is separated from the adjacent rocks with faults. Generally, the geologists classified it into Upper Carboniferous according to Pseudostaffella sp.,Profusulinella sp. and Fusulinella sp. found from the limestone and sandy limestone of Aiktik. Our radiolarian fossils were obtained from the chert samples collected from Haladaok section located at the upper stream of Tuoshihan river. The fossils include mainly Albcillla undulata Deflandre, Albillla paradoxa Deflandre, Albaillella sp. aff. A. paradoxa Deflandre, Albaillella sp. cf. A. deflandrei Gourmelon, Albillella sp., Albillella excelsa Ishiga, Kito and Imoto (?), Belowea variabilis (Ormiston et Lane), Callella cf. C. parvispinosa Won, Entactinia cf. E. tortispina Ormiston et Lane, Entactinia aff. E. tortispina Ormiston et Lane, Entactinia variospina Won, Entactinia sp., Eostylodictya rota (Won),Latentifistula impella (Ormistone et Lane) (?), Latentifistula turgida Omiston et Lane, Latentifistulidae. gen. et. sp. indet. 和Polyentactinia cf. aranea Gourmelon. In which, Albaillella excelsa Ishiga, Kito and Imoto (?) isa Late Permian species with some element of unsure as there is only one unwell-preserved individual fossil of this species found so far. And two radiolarian assemblages can be identified out from the other fossils. One is the early Early Carboniferous assemblage represented with Alballella undulata Deflandre, Alballella paradoxa Deflandre and Albailella sp. cf. A. deflandrei Gourmelon. And the other is the late Early Carboniferous assemblage represented with Eostylodictya rota (Won). This is the first discovery of radiolarian fossils in Aiktik group, also the first discovery of Late Permian radiolarian fossil in Chinese South Tianshan. Meanwhile, this is the current most-west sampling place of radio larian fossil in Chinese South Tianshan.
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