LA-ICP-MS dating of Zhangjiakou Formation volcanic rocks in the Zhangjiakou region and its geological significance
LA-ICP-MS dating of Zhangjiakou Formation volcanic rocks in the Zhangjiakou region and its geological significance
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DOI：
10.1016/j.pnsc.2008.01.028
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
Hong Zhang;Mingxin Wang;Xiaoming Liu
中科院分区：
文献类型：
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作者：
Hong Zhang;Mingxin Wang;Xiaoming Liu
张家口组地质剖面最初是在张家口地区建立的。通过对张家口地区张家口组典型剖面4个样品的测年，发现其年龄范围主要在143.0±3.7 ~ 136.1±1.4Myr之间，几乎等于滦平地区张家口组（136 ~ 135myr）和土城子组（143 ~ 136myr）年龄范围的总和，认为张家口-滦平地区张家口组与土城子组的年龄范围是整合的。上述证据表明，分布在张家口-滦平地区的张家口组和土城子组形成于同一地质背景下。西部地区（张家口）的火山活动时间较东部地区（滦平）早，时间较长（143 ~ 136myr）。承德、平泉“张家口组”形成于辽西义县组形成的时期，故应改名为义县组。
The geological cross section of the Zhangjiakou Formation is originally established in the Zhangjiakou region. From the dating of four samples from typical cross sections of the Zhangjiakou Formation in the Zhangjiakou region, the age range is found to be mainly from 143.0±3.7Myr to 136.1±1.4Myr, which almost equals the sum of the age range of the Zhangjiakou Formation (136–135Myr) and that of the Tuchengzi Formation (143–136Myr) in the Luanping region, and the Zhangjiakou and Tuchengzi Formations in Zhangjiakou-Luanping of North Hebei are found to be conformable. The evidence above indicates that the Zhangjiakou and Tuchengzi Formations, which are distributed in Zhangjiakou-Luanping, were formed under the same geological setting. Volcanic activity was earlier and longer (143–136Myr) in the western region (Zhangjiakou) than that in the eastern region (Luanping). The “Zhangjiakou Formation” in Chengde and Pingquan formed in the period in which the Yixian Formation in West Liaoning formed, so should be renamed the Yixian Formation.