Isotope geochronology of the fossil-bearing beds in the Daohugou area, Ningcheng, Inner Mongolia
Isotope geochronology of the fossil-bearing beds in the Daohugou area, Ningcheng, Inner Mongolia
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发表时间：
2004
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通讯作者：
L. Xinyu
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作者：
L. Xinyu
在内蒙古宁城道虎沟地区发现了一套新的含化石层--道虎沟含化石层。以化石层为代表的道虎沟生物群是研究燕辽生物群灭绝原因和热河生物群起源的关键。精确的Ar-Ar和SHRIMP U-Pb定年表明，道虎沟化石层上覆的中酸性火山岩的年龄约为164-165 Ma，而该化石层的年龄大于或等于165 Ma。因此，笔者认为道虎沟生物群的时代比热河生物群早数千万年，应属于燕辽生物群或燕辽生物群与热河生物群之间的过渡类型。
A new set of fossil-bearing beds, Daohugou fossil-bearing beds, is found in the Daohugou area, Ningcheng, Inner Mongolia. The Daohugou biota represented by the fossil beds is the key to the study of the cause for the extinction of the Yanliao biota and the origin of the Jehol biota. The accurate Ar-Ar and SHRIMP U-Pb dating shows that the age of intermediate-acid volcanic rocks overlying the Daohugou fossil-bearing beds is about 164-165 Ma, and that the age of this fossil-bearing beds is older than or equal to 165 Ma. Therefore the authors draw the conclusion that the age of the Daohugou biota is tens of million years earlier than that of the Jehol biota, and it should belong to the Yanliao biota or to a transitional type between the Yanliao biota and Jehol biota.