Organic-walled microfossils from the early Neoproterozoic Liulaobei Formation in the Huainan region of North China and their biostratigraphic significance
Organic-walled microfossils from the early Neoproterozoic Liulaobei Formation in the Huainan region of North China and their biostratigraphic significance
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华北淮南地区新元古代早期刘老北组有机壁微体化石及其生物地层意义
DOI：
10.1016/j.precamres.2013.07.019
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发表时间：
2013-10
影响因子：
3.8
通讯作者：
Wan, Bin
中科院分区：
文献类型：
--
作者：
Xiao, Shuhai;Yuan, Xunlai;Ou, Zhiji;Wan, Bin
新元古代早期生物地层划分与对比因分布广泛、时代特征明确的化石数量有限而受到限制。在其他一些微体化石类群中，棘形疑源类Trachyhystricophaera aimika已成为一个潜在的新元古代早期指标化石，但其时间和空间范围尚未得到充分的记录。为提高对新元古代早期生物多样性的认识，对安徽北方新元古代早期刘老碑组进行了微体古生物调查。我们的调查使用低操作浸渍技术揭示了一个多样化的组合的有机壁微体化石占主导地位的sphaeromorphs和细丝，相对较少的acanthomorphs类群。共回收23个分类群，包括3个新种（Eotylotopalla？伟大的例如，巨型管藻例如，和粗囊磷孢菌（Trachyhystricophaera botulan）。sp.）。在刘老碑组中还发现了广泛存在于前低温期、新元古代和中元古界晚期岩石中的Trachyhystrichophaera aimika和以椭圆形囊泡为特征的Pololeptus rugosus。新的数据增加了新元古代早期化石的多样性，并加强了新元古代早期地层生物地层对比的基础。与其他年代学序列的对比，包括Trachyhystrichophaeraaconfirms、TrachyhystrichophaeraeraandT. aimikaas是一种很有前途的指标化石，可以根据全球边界层型剖面和点（GSSP）来定义和划分前低温新元古代，而不是目前使用全球标准地层年龄（GSSA）的系统。已有的生物地层学资料，包括Trachyhystricophosphaera、Chuaria、Tawuia和Sinosabellites的出现，表明刘老碑组的时代是前低温期新元古代，而不是过去所认为的低温期-埃迪卡拉纪。
Biostratigraphic subdivision and correlation of early Neoproterozoic strata is hampered by the limited number of widely distributed and age diagnostic fossils. The acanthomorphic acritarchTrachyhystrichosphaera aimika, among a few other microfossil taxa, has emerged as a potential early Neoproterozoic index fossil, but its temporal and spatial ranges have not been thoroughly documented. To improve our knowledge about early Neoproterozoic biodiversity, we carried out a micropaleontological investigation of the early Neoproterozoic Liulaobei Formation in northern Anhui of North China. Our investigation using a low-manipulation maceration technique revealed a diverse assemblage of organic-walled microfossils dominated by sphaeromorphs and filaments, with relatively few acanthomorph taxa. A total of 23 taxa were recovered, including three new species (Eotylotopalla?grandisn. sp.,Siphonophycus gigasn. sp., andTrachyhystrichosphaera botulan. sp.). Also present in the Liulaobei Formation areTrachyhystrichosphaera aimika(a species widely present in pre-Cryogenian Neoproterozoic and latest Mesoproterozoic rocks) andPololeptus rugosus(a species characterized by an ellipsoidal vesicle with transverse annulations). The new data add to the growing diversity of early Neoproterozoic fossils and strengthen the basis for improved biostratigraphic correlation of early Neoproterozoic strata. Correlation with other geochronologically dated successions that containTrachyhystrichosphaeraconfirmsTrachyhystrichosphaeraandT. aimikaas promising index fossils to define and subdivide the pre-Cryogenian Neoproterozoic Era in terms of Global Boundary Stratotype Section and Point (GSSP), as opposed to current system using Global Standard Stratigraphic Age (GSSA). Available biostratigraphic data, including the occurrence ofTrachyhystrichosphaera,Chuaria,Tawuia, andSinosabellidites, suggest that the Liulaobei Formation is of pre-Cryogenian Neoproterozoic age, not Cryogenian–Ediacaran age as some have suggested in the past.
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DOI：
10.1666/11-022.1
发表时间：
2011-09
期刊：
--
影响因子：
--
作者：
V. N. Sergeev;A. Knoll;N. G. Vorob’eva
通讯作者：
V. N. Sergeev;A. Knoll;N. G. Vorob’eva
影响因子：
0.9
作者：
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通讯作者：
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DOI：
--
发表时间：
2012
期刊：
--
影响因子：
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作者：
L. Meng;Liu Pengju;Yin Chong-yu;T. Feng;Gao Linzhi;Chen Shou-ming
通讯作者：
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影响因子：
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作者：
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通讯作者：
C. Allison;S. Awramik
影响因子：
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作者：
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通讯作者：
G. Vidal;M. Moczydłowska;V. A. Rudavskaya