Detrital Zircon U-Pb Dating of Early Cretaceous Yingzuilazi Formation in Liuhe Basin, Northern Margin of North China Plate and Its Geological Significance
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摘要: 华北板块北缘在晚中生代受到古太平洋板块西向俯冲作用的影响，发育强烈的构造变形及大规模的岩浆活动.研究区柳河盆地地处华北板块北缘，对其开展研究能够为约束华北板块北缘晚中生代构造演化阶段提供沉积方面的证据.依据对盆地早白垩世鹰嘴砬子组样品碎屑组分、岩性序列、沉积相演化特征的研究，结合碎屑锆石U-Pb年代学判断，盆地样品矿物组成具有石英含量较低，岩屑和长石含量较高的特点，显示沉积物物源主要来自岩浆弧物源区.两组碎屑锆石U-Pb年龄组成相似，以晚中生代为主，古元古代为辅.L1-B178样品（岩心）碎屑锆石存在约127 Ma的主峰和约2 553 Ma的次峰；P303-B3样品（剖面）存在约126 Ma的主峰和约2 545 Ma的次峰，中生代沉积物物源可能来自盆地东北侧丰富的岩浆岩.早白垩世鹰嘴砬子组最年轻碎屑锆石颗粒的U-Pb年龄限定岩层的最大沉积年龄为（125±4）Ma，介于早白垩世巴雷姆阶与阿普特阶，与层内流纹岩样品（124.3±0.7）Ma的锆石加权平均年龄吻合.通过对柳河盆地样品矿物组成特点、沉积相演化和碎屑锆石U-Pb年代学特征综合判断，盆地在（125±4）Ma已接收到古太平板块俯冲作用带来的物源.Abstract: The Late Mesozoic westward subduction of the Paleo-Pacific Plate impacted the northern border of the North China Plate, causing significant tectonic deformation and large-scale magmatic activity. The Liuhe basin is situated on the North China Plate's northern border. The study of the Liuhe basin can be used to constrain the Late Mesozoic tectonic development of the North China Plate's northern border. The mineral composition of the basin samples is characterized by low quartz content and high rock debris and feldspar content, indicating that the sediment provenance primarily comes from the magmatic arc provenance area, according to mineral composition characteristics, sedimentary facies evolution, and detrital zircon U-Pb chronological characteristics of the basin samples. The age composition of detrital zircons from the two groups of samples from the Early Cretaceous Yingzuilazi Formation in the research area is similar, mainly in Late Mesozoic, supplemented by Paleoproterozoic. The major peak of the detrital zircons in L1-B178 samples is around 127 Ma, and the secondary peak is around 2 553 Ma. The Mesozoic sediment provenance may come from the igneous rocks of the basin, as the P303-B3 sample contains a major peak of around 126 Ma and a secondary peak of about 2 545 Ma. The maximum sedimentary age of the strata is (125±4) Ma, which is between the Early Cretaceous Barremian and Aptian stages and is compatible with the weighted average zircon age of (124.3±0.7) Ma for the rhyolite samples. The Liuhe basin, located on the northern boundary of the North China Plate, obtained its provenance from the ancient Pacific Plate subduction about (125±4) Ma, according to mineral composition features, sedimentary facies history, and detrital zircon U-Pb dating characteristics of basin samples.
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Key words:
- Liuhe basin /
- Early Cretaceous /
- Yingzuilazi Formation /
- zircon U-Pb age /
- provenance /
- geochronology /
- petrology
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图 2 碎屑锆石样品岩心、野外及镜下照片
P.斜长石；K.正长石；Mic.微斜长石；Pth.条纹长石；La.安山岩岩屑；Lr.流纹岩岩屑；Lt.凝灰岩岩屑
Fig. 2. The core, field and mirror photo of the clastic rock samples
图 3 矿物成分分析各端元平均含量条形图
Fig. 3. Bar chart of average content of each end member in detrital modal analysis
图 4 柳地1井和303国道剖面早白垩世鹰嘴砬子组岩性综合柱状图及取样位置(据蓝艺植等, 2018修改)
Fig. 4. Comprehensive lithologic histogram and sampling location of Early Cretaceous Yingzuilazi Formation in LiuDi Well 1 and national highway 303 (modified according to Lan et al., 2018)
图 5 柳河盆地鹰嘴砬子组砂岩典型锆石CL图像和年龄（Ma）
Fig. 5. Typical CL images and ages (Ma) of the zircons of sandstone in Yingzuilazi Formation, Liuhe basin
图 6 鹰嘴砬子组锆石年龄与Th/U比值散点图
底图据Hoskin（2003）
Fig. 6. Scatter plot of zircon age vs. Th/U ratio of Yingzuilazi Formation
图 7 柳河盆地鹰嘴砬子组碎屑锆石谐和曲线、年龄分布
Fig. 7. Concordia curve and age distribution map of the clastic zircons of Yingzuilazi Formation in Liuhe basin
图 8 鹰嘴砬子组样品L1-B178最年轻碎屑锆石加权平均年龄（a），样品P303-B3最年轻碎屑锆石加权平均年龄（b），流纹岩样品碎屑锆石谐和曲线（c）和流纹岩样品最年轻碎屑锆石加权平均年龄（d）
Fig. 8. Weighted average ages of the youngest detrital zircons of samples L1-B178 (a), P303-B3 (b), Rhyolite samples detrital zircon concordance curve (c) and weighted average age of the youngest detrital zircon rhyolite samples (d)
图 9 柳河盆地鹰嘴砬子组碎屑岩样品Dickinson三角图解
底图据Dickinson and Gehrels（2003）
Fig. 9. The Dickinson diagram of Yingzuilazi Formation sandstones in Liuhe basin
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