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首页 > 过刊浏览>2023年第69卷第6期 >2023060030-2023060030. DOI:10.16509/j.georeview.2023.12.015
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浙西里垄正长岩SIMS锆石UPb年龄、地球化学特征及其地质意义
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本文为国家自然科学基金资助项目（编号：42262009）、核资源与环境国家重点实验室开放基金资助项目（编号：2020Z04）的成果。


SIMS zircon UPb age, geochemical characteristics and geological significance of the Lilong syenite in western Zhejiang
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  • 1) 东华理工大学核资源与环境国家重点实验室，南昌，330013；2) 东华理工大学地球科学学院，南昌，330013；3) 江西省地质调查勘查院地质环境监测所，南昌，330006；    
  • 1) 东华理工大学核资源与环境国家重点实验室，南昌，330013    
  • 1) 东华理工大学核资源与环境国家重点实验室，南昌，330013；2) 东华理工大学地球科学学院，南昌，330013；    
  • 4) 中核集团核工业北京地质研究院，铀资源勘查与评价技术重点实验室，北京，100029；    
  • 1) 东华理工大学核资源与环境国家重点实验室，南昌，330013；2) 东华理工大学地球科学学院，南昌，330013；    
  • 1) 东华理工大学核资源与环境国家重点实验室，南昌，330013；2) 东华理工大学地球科学学院，南昌，330013；    
  • 3) 江西省地质调查勘查院地质环境监测所，南昌，330006；    
  • 3) 江西省地质调查勘查院地质环境监测所，南昌，330006；    
  • 5) 西藏自治区地质矿产勘查开发局第六地质大队，拉萨，851400    
  • 1) State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013; 2) College of Earth Sciences, East China University of Technology, Nanchang, 330013; 3) Geological Environment Monitoring Institute of Jiangxi geological survey and Exploration Institute, Nanchang, 330006    
  • 1) State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013    
  • 1) State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013; 2) College of Earth Sciences, East China University of Technology, Nanchang, 330013    
  • 4) Key Laboratory of Uranium Resources Exploration and Evaluation Technology, Beijing Research Institute of Uranium Geology, Beijing, 100029;    
  • 1) State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013; 2) College of Earth Sciences, East China University of Technology, Nanchang, 330013    
  • 1) State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013; 2) College of Earth Sciences, East China University of Technology, Nanchang, 330013    
  • 3) Geological Environment Monitoring Institute of Jiangxi geological survey and Exploration Institute, Nanchang, 330006    
  • 3) Geological Environment Monitoring Institute of Jiangxi geological survey and Exploration Institute, Nanchang, 330006    
  • 5) No. 6 Geological Party, Xizang Bureau of Geology and Mineral Exploration and Development, Lhasa, 851400    
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    摘要:

    江山—绍兴断裂带内发育的新元古代岩浆岩，对理解江南造山带新元古代构造演化以及Rodinia超大陆聚合与裂解有重要意义。本文首次报道了浙西里垄正长岩的SIMS锆石UPb年龄、全岩地球化学研究结果。里垄正长岩具有较高的SiO2（平均值为5965%），低的镁铁质含量（FeOT和MgO平均值分别为406%和141%）；Na2O/K2O值介于327~534，平均为446；铝饱和指数(A/CNK)介于085~094，具有钙碱性准铝质I型花岗岩特征。正长岩富集K、Ba等大离子亲石元素，Th、Ce等高场强元素和轻稀土元素，相对亏损Ta、Nb、Zr、Ti等高场强元素和重稀土元素，与安第斯型钙碱性系列岩石基本一致；样品具有轻微Eu负异常，δEu平均值为082，指示有少量斜长石的结晶分异。正长岩锆石UPb定年结果为8407±24 Ma，属于新元古代中期岩浆活动的产物。基于本次研究结果，里垄正长岩可能形成于古洋壳向西北俯冲后在扬子地块产生的大陆弧后环境，岩浆源区为下地壳。结合区域构造演化资料，本文提出840 Ma左右扬子与华夏仍未最终碰撞，新元古代中期浙皖赣相邻区一直处于古华南洋板块持续向扬子东南缘俯冲消减的构造环境，该体系可能与Rodinia超大陆汇聚事件有关。

    Abstract:

    Neoproterozoic magmatic rocks are developed along the Jiangshan—Shaoxing fault zone. They give us a window to understand the Neoproterozoic tectonic evolution, and the aggregation and breakup of the Rodinia supercontinent. This paper reports the results of SIMS zircon UPb age and wholerock geochemistry of the Lilong syenite in western Zhejiang. The Lilong syenite has high SiO2 content (average of 59.65%) with low FeOT and MgO content (average of 4.06% and 1.41%). The ratio of Na2O/K2O ranges from 3.27 to 5.34, with an average of 4.46. The aluminum saturation index (A/CNK) is between 0.85 and 0.94, resemble the characteristics of calcalkaline quasialuminous Itype granite. The syenite is enriched in large ion lithophile elements such as K and Ba, high field strength elements (HFSE) such as Th and Ce and light race earth elements (LREE), and relatively depleted in HFSE such as Ta, Nb, Zr and Ti and heavy race earth elements (HREE), which is basically consistent with the Andeantype calcalkaline series rocks. The rock samples have a slight negative Eu anomaly with the average value of 0.82 (δEu 0.77~0.87), indicating a small amount of crystallization differentiation of plagioclase. The SIMS zircon UPb dating result of syenite is 840.7±2.4Ma, which belongs to the product of magmatic activity in the middle Neoproterozoic. Based on the results of this study, the Lilong syenite may be formed in the continental backarc environment generated by the northward subduction of the ancient oceanic crust to the Yangtze Block. The magma source of the Lilong syenite origin from the lower crust. Combined with the regional tectonic evolution background, it is proposed that the Yangtze and Cathaysia Block have not finally collided at ~840Ma, and the adjacent area, such as the Zhejiang, Anhui and Jiangxi, still in the subduction zone background during the continuous subduction of the ancient South China Ocean Plate to the southeastern margin of the Yangtze Block in the middle Neoproterozoic. This process may be related to the Rodinia supercontinent convergence event.

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张胜了,郭国林,巫建华,武勇,刘清,严文亚,李昌龙,姜智东,尊珠桑姆.2023.浙西里垄正长岩SIMS锆石UPb年龄、地球化学特征及其地质意义[J].地质论评,69(6):2023060030,[DOI].
ZHANG Shengliao, GUO Guolin, WU Jianhua, WU Yong, LIU Qing, YAN Wenya, LI Changlong, JIANG Zhidong, ZUNZHU Sangmu.2023. SIMS zircon UPb age, geochemical characteristics and geological significance of the Lilong syenite in western Zhejiang[J]. Geological Review,69(6):2023060030.

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  • 收稿日期:2023-05-31
  • 最后修改日期:2023-11-23
  • 在线发布日期: 2023-12-20
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