BASAL CAMBRIAN MICROFOSSILS FROM THE YANGTZE GORGES AREA (SOUTH CHINA) AND THE AKSU AREA (TARIM BLOCK, NORTHWESTERN CHINA)
BASAL CAMBRIAN MICROFOSSILS FROM THE YANGTZE GORGES AREA (SOUTH CHINA) AND THE AKSU AREA (TARIM BLOCK, NORTHWESTERN CHINA)
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长江三峡地区（中国南部）和阿克苏地区（中国西北部塔里木地块）的基底寒武纪微化石
DOI：
10.1666/07-147r.1
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发表时间：
2009-01-01
影响因子：
1.4
通讯作者：
Yaoi, Jinxian
中科院分区：
文献类型：
--
作者：
Dong, Lin;Xiao, Shuhai;Yaoi, Jinxian
基底寒武纪标志着生命史上重要篇章的开始。然而，大多数关于寒武纪基底的古生物学工作都集中在动物骨骼化石上，而我们对初级生产者（蓝细菌和真核浮游植物原源）的了解是有限的。在这项研究中。我们研究了寒武纪基底。球状微化石。长江三峡地区严家河组和阿克苏地区玉尔图斯组的磷矿和燧石中保存有蓝藻和蓝藻。我们的研究证实了这两个地层中存在着基底寒武纪 Asteridium-Comasphaeridium-Heliosphaeridium (ACH) 组合特征的小型棘齿形原体。这些原源包括丰富的 Heliosphaeridium ampliatum (Wang, 1985) Yao et al., 2005。将军和 n. sp. 和罕见的 Comasphaeridium 环状 (Wang, 1985) Yao 等人。 2005. 此外，这些寒武系基底序列还含有簇状球状微化石Archaeophycus yunnanensis (Song, in Luo et al.. 1982) n. 2005。梳.. 几种丝状蓝细菌 [Cyanonema majus n. sp., Oscillatoriopsis longa Timofeev 和 Hermann, 1979, 和 Siphonophycusroustum (Schopf, 1968) Knoll 等人, 1991]，以及板状管状微化石 Megathrix longus L. Yin, 1987a。名词订正。其中一些类群（例如 H. ampliatum、C ringe 和 M. longus）具有广泛的地理分布，但仅出现在寒武纪基底序列中，这支持了它们的生物地层重要性。本文报道的微化石的地层分布与其他人发表的动物骨骼化石的比较表明，动物和浮游植物在寒武纪大爆发期间同时辐射。
The basal Cambrian marks the beginning of an important chapter in the history of life. However, most paleontological work on the basal Cambrian has been focused on skeletal animal fossils, and our knowledge about the primary producers-cyanobacteria and eukaryotic phytoplankton acritarchs)-is limited. In this research. we have investigated basal Cambrian acritarchs. coccoidal microfossils. and cyanobacteria preserved in phosphorites and cherts of the Yanjiahe Formation in the Yangtze Gorges area (South China) and the Yurtus Formation in the Aksu area (Tarim Block, northwestern China). Our study confirms the occurrence in these two formations of small acanthomorphic acritarchs characteristic of the basal Cambrian Asteridium-Comasphaeridium-Heliosphaeridium (ACH) assemblage. These acritarchs include abundant Heliosphaeridium ampliatum (Wang, 1985) Yao et al., 2005. common Yurtusia uniformis n. gen. and n. sp., and rare Comasphaeridium annulare (Wang, 1985) Yao et al. 2005. In addition, these basal Cambrian successions also contain the clustered coccoidal microfossil Archaeophycus yunnanensis (Song, in Luo et al.. 1982) n. comb.. several filamentous cyanobacteria [Cyanonema majus n. sp., Oscillatoriopsis longa Timofeev and Hermann, 1979, and Siphonophycus robustum (Schopf, 1968) Knoll et al., 1991], and the tabulate tubular microfossil Megathrix longus L. Yin, 1987a. n. emend. Some of these taxa (e.g., H. ampliatum, C annulare, and M. longus) have a wide geographic distribution but occur exclusively in basal Cambrian successions, supporting their biostratigraphic importance. Comparison between the stratigraphic occurrences of microfossils reported here and skeletal animal fossils published by others suggests that animals and phytoplankton radiated in tandem during the Cambrian explosion.