LA-ICP-MS U-Pb dating of zircons from Tuchengzi Formation in Qianjiadian of North Beijing and its significance
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摘要:
土城子组为一套广泛分布于冀北、辽西地区的陆相沉积地层。自20世纪80年代以来，该套地层的时代问题便是众多学者关注和争论的焦点。文章通过LA-ICP-MS锆石U-Pb同位素测年，得出北京延庆千家店土城子组下部年龄为（157.6±0.7）Ma，中上部年龄为（157.1±1.0）Ma，属于晚侏罗世早期。结合前人资料，认为燕山地区土城子组发育时限为163~130 Ma，在此期间土城子组呈现出迁移性、间断性的沉积特征；146~137 Ma为土城子组主体的沉积年龄；土城子组与髫髻山组、张家口组之间在区域上并不存在不整合关系，在大部分情况下应属同一构造背景下的产物。
Abstract:Tuchengzi Formation is a widely distributed continental sedimentary stratum in northern Hebei and western Liaoning provinces. Since the 1980s, the stratigraphic age of this formation has attracted much attention and aroused heated debate among researchers. Through LA-ICP-MS U-Pb dating of zircons, the authors obtained two early Late Jurassic ages of this formation in Qianjiadian area. One of them is 157.6±0.7 Ma for the lower part, and the other is 157.1±1.0 Ma for the upper part. Combined with previous data, the ages of Tuchengzi Formation should be 163-130 Ma in the Yanshan area. During this period, Tuchengzi Formation showed mobility and intermittent sedimentary characteristics. The primary sedimentary ages of Yanshan area should be 146-137 Ma, and the contact relationship between Tiaojishan, Tuchengzi and Zhangjiakou formations are not in unconformity. The authors consider that they should be products of the same ectonic setting in most cases.
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Keywords:
- Tuchengzi Formation /
- volcanic rocks /
- zircon /
- LA-ICP-MS /
- chronostratigraphy
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致谢: 感谢河北省区域地质调查大队、北京奥金顿科技有限公司、天津地质调查中心试验测试室
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图 1 北京市延庆县千家店盆地土城子组火山岩采样位置简图
Figure 1. Simplified geological map showing sampling sites of volcanic rocks of the Tuchengzi Formation in Qianjiadian basin, Yanqing County, Beijing
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图 4 N1 样品LA-ICP-MS锆石U-Pb谐和图
Figure 4. Zircon U-Pb concordia diagram for N1 sample by LA-ICP-MS
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图 5 N2 样品LA-ICP-MS锆石U-Pb谐和图
Figure 5. Zircon U-Pb concordia diagram for N2 sample by LA-ICP-MS
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图 6 燕山地区部分土城子组同位素年龄分布示意图
a—土城子组上部年龄：（144.7±2.8）Ma[10]；b—土城子组上部年龄：（130±1）Ma[20]；c—土城子组年龄：（162.8±11.4）Ma[31]；d—土城子组上部年龄：144.6 Ma[10；e—土城子组下部年龄：（157.6±0.7）Ma，中上部年龄：（157.1±1.0）Ma（本文年龄测试结果）；f—土城子组年龄：（161.2±2.3）Ma[32]；g—土城子组底部年龄：（153±1）Ma[15]；h—土城子组上，中，下部年龄：（136.4±1.9）Ma，（139.6±1.5）Ma，（142.6±1.3）Ma[13]；i—土城子组底部年龄：（146.5±1.7）Ma[16]；j—土城子组底部年龄：（156±5.2）Ma[33]；k—土城子组年龄：（153.7±1.5）Ma~（138.9±0.94）Ma[21].
Figure 6. U-Pb age distribution of Tuchengzi Formation in Yanshan area
a-Age of the upper part of the Tuchengzi Formation:（144.7±1.8）Ma[10]；b-Age of the upper part of the Tuchengzi Formation:（130±1）Ma[20]；c-Age of the Tuchengzi Formation:（162.8±11.4）Ma[31]；d-Age of the upper part of the Tuchengzi Formation: 145.7Ma[10]；e-Age of the lower part ofthe Tuchengzi Formation:（157.6±0.7）Ma（this paper），Age of the middle and upper part of the Tuchengzi Formation:（157.1±1.0）Ma（the authors）；f-Age of the Tuchengzi Formation：（161.2±2.3）Ma[32]；g-Age of the bottom of the Tuchengzi Formation:（153±1）Ma[15]；h-Age of the upper, middleand lower parts of the Tuchengzi Formation:（136.4±1.9）Ma，（139.6±1.5）Ma，（142.6±1.3）Ma[13]；i-Age of the bottom of the Tuchengzi Formation:（146.5±1.7）Ma[16]；j-Age of the bottom of the Tuchengzi Formation:（156±5.2）Ma[33]；k-Age of the Tuchengzi Formation：（153.7±1.5）Ma-（138.9±0.94）Ma[21]
表 1 延庆千家店盆地土城子组测年样品一览
Table 1 List of dating samples of Tuchengzi Formation in Qianjiadian Basin, Yanqing County
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