Late Cretaceous–early Paleocene ostracod biostratigraphy of Scientific Drilling Sk1(N) in the Songliao Basin, northeast China
Late Cretaceous–early Paleocene ostracod biostratigraphy of Scientific Drilling Sk1(N) in the Songliao Basin, northeast China
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DOI：
10.1666/13-076
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
Haiying Qu;Dangpeng Xi;Sha Li;J. Colin;Qinghua Huang;X. Wan
中科院分区：
文献类型：
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作者：
Haiying Qu;Dangpeng Xi;Sha Li;J. Colin;Qinghua Huang;X. Wan
白垩纪陆相沉积在我国分布广泛，研究成果较为全面。松辽盆地是开展白垩系生物地层学研究的理想地区。然而，尽管对该盆地进行了大量的研究，但对其晚白垩世生物地层和古环境知之甚少。本文以松辽盆地晚白垩世SK 1（n）孔介形类化石为基础，建立了高分辨率的生物地层学。本次研究共回收到20属45种，其中有1新种（Ilyocypris bisulcata n.种）5个介形类组合：Cypridea gunsulinensis-Mongolocypris magna组合，以首次出现（F.O.）Ilyocyprimorpha-Limnocypridea sunliaonensis-Periacanthella组合，其范围从F.O. Ilyocyprimorpha的节和刺到F.O. Strumosia sp.;来自F.O.的Strumosia inandita组合。Strumosia sp.的出现频率（L.O.）Talicypridea amoena-Metacypris kaitunensis-Ziziphocypris simakovi组合; Mongolocypris apiculata（Cea）和Talicypridea amoena对F.O. Ilyocypris sp.;和Ilyocypris组合。Ilyocypris sp.的L.O.二沟依鲤Ilyocypris bisulcata n. sp.此外，还发现了带性化石Ilyocypris bisulcata n. sp.，并发现Neochara和Grovesicahra等古新世轮藻属与5带动物群共存。Ilyocypris组合的时代为最晚的Maastrichtian至最早的Danian。
Abstract Cretaceous non-marine deposits are widespread in China and have been studied comprehensively. The Songliao Basin in northeast China is thought to be well suited for investigation of Cretaceous biostratigraphy. However, despite much research having been conducted in the basin, little is known about its Late Cretaceous biostratigraphy and paleoenvironment. Here, we establish a high-resolution biostratigraphy of the Late Cretaceous based on ostracods from borehole SK1(n) in the Songliao Basin, northeast China. As part of the present study, 45 species assigned to 20 genera have been recovered, with one new species (Ilyocypris bisulcata n. sp.) and five ostracod assemblages: the Cypridea gunsulinensis–Mongolocypris magna assemblage, which is marked by the first occurrence (F.O.) of Ilyocyprimorpha with nodes and spines; the Ilyocyprimorpha–Limnocypridea sunliaonensis–Periacanthella assemblage, which ranges from the F.O. of Ilyocyprimorpha with nodes and spines to the F.O. of Strumosia sp.; the Strumosia inandita assemblage from the F.O. of Strumosia sp. to the lower occurrence (L.O.) of Strumosia inandita; the Talicypridea amoena–Metacypris kaitunensis–Ziziphocypris simakovi assemblage from the F.O. of Mongolocypris apiculata (Cea) and Talicypridea amoena to the F.O. of Ilyocypris sp.; and the Ilyocypris assemblage from the F.O. of Ilyocypris sp. to the L.O. of Ilyocypris bisulcata n. sp. Moreover, the zonal fossil Ilyocypris bisulcata n. sp. of Zone 5 is here described for the first time from the upper Mingshui Formation, and Paleocene charophyte genera including Neochara and Grovesicahra have been found to coexist with the Zone 5 fauna. The age of the Ilyocypris Assemblage is assigned to the latest Maastrichtian to the earliest Danian.