An accurately delineated Permian-Triassic Boundary in continental successions
An accurately delineated Permian-Triassic Boundary in continental successions
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准确描绘的大陆序列中的二叠纪-三叠纪边界
DOI：
10.1007/s11430-007-0048-2
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发表时间：
2007-09
期刊：
影响因子：
--
通讯作者：
Zhang SuXin
中科院分区：
文献类型：
--
作者：
Yin HongFu;Yang FengQing;Yu JianXin;Peng YuanQiao;Wang ShangYan;Zhang SuXin
二叠纪-三叠纪边界地层集（PTBST）是眉山GSSP剖面的特征，广泛分布于华南海相二叠纪-三叠纪边界（PTB）序列中，用于追踪和识别岔河（地层66f-68c）大陆层序中的PTB。多样化的二叠纪植物化石延伸至PTBST，少数遗迹幸存下来，其上方被三叠纪的裸子植物花粉所取代。在附近的哲觉剖面，大陆性 PTBST 的特点是在世界许多地方都有记录的真菌“尖峰”。 PTBST 的边界粘土层（66f 和 68a、c）由伊利石-蒙脱石混合层组成，与眉山的粘土层类似。它们含有火山矿物，如β石英和锆石。对上部粘土层进行 U/Pb 测年，68a 层和 68c 层的年龄分别为 247.5 Ma 和 252.6 Ma，平均年龄为 250 Ma。与新疆和南非的情况不同，岔河剖面（56～80层）二叠纪—三叠纪过渡时期的沉积层序向上变细。因此，向上变浅和变粗并不是所有地方二叠纪-三叠纪过渡的特征。加伊头组巨蕨植物群遗迹的赋存情况。表明，与大多数海洋生物群不同，这种古植物区系的遗迹存活到了最早的三叠纪。结论认为岔河67层与眉山27层相对应，PTB应置于60cm厚的67b④层内，现暂置于其底部。这是陆相 PTB 与海相 GSSP 最准确的对比。
The Permian-Triassic Boundary Stratigraphic Set (PTBST), characteristic of the GSSP section of Meishan and widespread in marine Permian-Triassic Boundary (PTB) sequences of South China, is used to trace and recognize the PTB in a continental sequence at Chahe (Beds 66f–68c). Diversified Permian plant fossils extended to the PTBST, and a few relicts survived above which they are replaced by gymnosperm pollen of Triassic aspect. In the nearby Zhejue Section, the continental PTBST is characterized by the fungal ‘spike’ recorded in many places throughout the world. The boundary claybeds (66f and 68a,c) of the PTBST are composed of mixed illite-montmorillonite layers analogous with those at Meishan. They contain volcanogenic minerals such as β quartz and zircon. U/Pb dating of the upper claybed gives ages of 247.5 and 252.6 Ma for Beds 68a and 68c respectively, averaging 250 Ma. In contrast to the situation in Xinjiang and South Africa, the sediment sequence of the Permian-Triassic transition in the Chahe section (Beds 56–80) become finer upward. Shallowing and coarsening upward is not, therefore, characteristic of the Permian-Triassic transition everywhere. The occurrence of relicts of theGigantopterisFlora in the Kayitou Fm. indicates that, unlike most marine biota, relicts of this paleophytic flora survived into the earliest Triassic. It is concluded that Bed 67 at Chahe corresponds to Bed 27 at Meishan, and that the PTB should be put within the 60-cm-thick Bed 67b④, now put at its base tentatively. This is the most accurate correlation of the PTB in continental facies with that in the marine GSSP.
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DOI：
--
发表时间：
2001
期刊：
Geological Review
影响因子：
--
作者：
Yin Hongfu
通讯作者：
Yin Hongfu
影响因子：
56.9
作者：
Jin, YG;Wang, Y;Erwin, DH
通讯作者：
Erwin, DH
DOI：
10.1016/0031-0182(94)00119-s
发表时间：
1995-08
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
Roger M. H. Smith
通讯作者：
Roger M. H. Smith
影响因子：
56.9
作者：
R. Mundil;K. Ludwig;I. Metcalfe;P. Renne
通讯作者：
R. Mundil;K. Ludwig;I. Metcalfe;P. Renne
影响因子：
1.5
作者：
C. Foster;M. Stephenson;C. Marshall;G. Logan;P. Greenwood
通讯作者：
C. Foster;M. Stephenson;C. Marshall;G. Logan;P. Greenwood