A diverse organic-walled microfossil assemblage from the Mesoproterozoic Xiamaling Formation, North China
A diverse organic-walled microfossil assemblage from the Mesoproterozoic Xiamaling Formation, North China
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华北中元古代下马岭组多样化的有机壁微化石组合
DOI：
10.1016/j.precamres.2021.106235
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发表时间：
2021-07
影响因子：
3.8
通讯作者：
Maoyan Zhu
中科院分区：
文献类型：
--
作者：
Lanyun Miao;Małgorzata Moczydłowska;Maoyan Zhu
中元古代(约1.85-0.85Ga)可能在环境上是“枯燥的”，但对于地球上早期建立真核生命来说，这是一个关键的时间段。中国北部中元古界下马岭组(约1.4~1.35Ga)以页岩为主，保存了丰富的有机壁微体化石，其中一些具有真核亲缘关系，但其分类多样性和演化意义尚不清楚。本文对天津市北部下马岭组下部进行了孢粉学研究。与其他中元古代微生物群相似，该组合由保存完好且多样的球形至椭圆形小泡、丝状微化石和细胞集合体组成。共鉴定出36种，隶属于28属，其中包括1个新种--棒状QuadriMurus clavatus gen。ET sp.和5个未命名的表格。这些分类群中的大多数是首次从该组中识别出来的，表明其组合比以前所知的更丰富。虽然大多数分类群具有未知的生物亲缘关系，但这个微生物区系被认为是由原核和真核微生物组成的，其中12个分类群被推测为真核生物。这些微体化石表明下马岭组中记录的真核生物具有适度的多样性，这与中元古代的其他微生物相一致。在中国北部发现的Jixiania lineata yan，1986(=Lineaforma delgata Vorob‘Eva and Sergeev，2015)扩大了它的地理分布，进一步增强了它作为中元古代早期地层指示化石的潜力。下马岭组合提供了中元古代生物圈的更广泛的图景之一，其中真核生物主要是原生级微生物。
The mid-Proterozoic (ca. 1.85–0.85Ga) might have been environmentally “boring”, but was a crucial interval of time for the early establishment of eukaryotic life on Earth. The Mesoproterozoic shale-dominated Xiamaling Formation (ca. 1.4–1.35Ga) in North China preserved abundant organic-walled microfossils, some of which were of eukaryotic affinity but their taxonomic diversity and evolutionary implications remain unclear. In this paper, we present a palynological study of the lower Xiamaling Formation in the northern Tianjin Municipality. Similar to other Mesoproterozoic microbiotas, this assemblage consists of well-preserved and diverse spheroidal to ellipsoidal vesicles, filamentous microfossils and cellular aggregates. In total, 36 species belonging to 28 genera are identified, including 1 new species Quadrimurus clavatus gen. et sp. nov., and 5 unnamed forms. Majority of these taxa are recognised for the first time from this formation, indicating a richer assemblage than previously known. Although most taxa are of unknown biological affinities, this microbiota is thought to be composed of prokaryotic and eukaryotic microorganisms, in which 12 taxa are inferred to be eukaryotic. These microfossils indicate a moderate diversity of eukaryotic life documented in the Xiamaling Formation, which is consistent with other microbiotas in the mid-Proterozoic. The presence of Jixiania lineata Yan, 1986 (=Lineaforma elongata Vorob’eva and Sergeev, 2015) in North China extends its geographic distribution and further enhances its potential as index fossil for the early Mesoproterozoic strata. The Xiamaling assemblage provides one of the broader pictures of the Mesoproterozoic biosphere, in which eukaryotes were predominantly protistan-grade microorganisms.
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DOI：
10.1017/s0022336000058108
发表时间：
2009-01
期刊：
--
影响因子：
--
作者：
Lin Dong;S. Xiao;B. Shen;Chuanming Zhou;Guoxiang Li;Jinxian Yao
通讯作者：
Lin Dong;S. Xiao;B. Shen;Chuanming Zhou;Guoxiang Li;Jinxian Yao
影响因子：
2.6
作者：
Strother PK;Wellman CH
通讯作者：
Wellman CH
影响因子：
2.6
作者：
Guochun Zhao;San-zhong Li;M. Sun;S. Wilde
通讯作者：
Guochun Zhao;San-zhong Li;M. Sun;S. Wilde
影响因子：
3.8
作者：
Lanyun Miao;M. Moczydłowska;Shixing Zhu;Maoyan Zhu
通讯作者：
Lanyun Miao;M. Moczydłowska;Shixing Zhu;Maoyan Zhu
影响因子：
3.8
作者：
Wang Fuxing;Z. Xuanyang;Gu Ruihuan
通讯作者：
Wang Fuxing;Z. Xuanyang;Gu Ruihuan