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北淮阳东端牛王寨岩体年代学及地球化学研究:对大别造山带早白垩世深部地质过程的制约

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张靖怡, 张舒, 张赞赞, 汪晶. 2022. 北淮阳东端牛王寨岩体年代学及地球化学研究:对大别造山带早白垩世深部地质过程的制约. 华东地质, 43(2): 141-153. doi: 10.16788/j.hddz.32-1865/P.2022.02.002
引用本文: 张靖怡, 张舒, 张赞赞, 汪晶. 2022. 北淮阳东端牛王寨岩体年代学及地球化学研究:对大别造山带早白垩世深部地质过程的制约. 华东地质, 43(2): 141-153. doi: 10.16788/j.hddz.32-1865/P.2022.02.002
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ZHANG Jingyi, ZHANG Shu, ZHANG Zanzan, WANG Jing. 2022. Geochronology and geochemistry of Niuwangzhai pluton in east end of North Huaiyang:constraints on deep geological process of Dabie Orogen in Early Cretaceous. East China Geology, 43(2): 141-153. doi: 10.16788/j.hddz.32-1865/P.2022.02.002
Citation: ZHANG Jingyi, ZHANG Shu, ZHANG Zanzan, WANG Jing. 2022. Geochronology and geochemistry of Niuwangzhai pluton in east end of North Huaiyang:constraints on deep geological process of Dabie Orogen in Early Cretaceous. East China Geology, 43(2): 141-153. doi: 10.16788/j.hddz.32-1865/P.2022.02.002
shu

北淮阳东端牛王寨岩体年代学及地球化学研究:对大别造山带早白垩世深部地质过程的制约

  • 1. 安徽省地质调查院, 安徽合肥 230001;

  • 2. 安徽省地质科学研究所, 安徽合肥 230001;

  • 3. 自然资源部覆盖区深部资源勘查工程技术创新中心, 安徽合肥 230001

  • 基金项目:

    安徽省重点研发计划项目"铜陵大型资源基地接替资源勘查研究(编号:201904a07020077)"和安徽省公益性地质调查"安徽省庐枞地区与碱性岩有关的铀(钍)矿调查评价(编号:2016-g-1-7)"、"安徽省稀有、稀散元素矿产远景调查(编号:2016-g-2-16)"项目联合资助。

详细信息
    作者简介: 张靖怡,1987年生,女,工程师,学士,主要从事地质调查与矿产勘查工作。Email:438646550@qq.com。
    通讯作者: 张舒,1986年生,男,高级工程师,博士,主要从事岩浆作用与金属矿床成矿机制研究。Email:zs-1638610@163.com。

  • 中图分类号: P581;P595;P597

Geochronology and geochemistry of Niuwangzhai pluton in east end of North Huaiyang:constraints on deep geological process of Dabie Orogen in Early Cretaceous

  • 1. Geological Survey of Anhui Province, Hefei 230001, Anhui, China;

  • 2. Anhui Institute of Geological Sciences, Hefei 230001, Anhui, China;

  • 3. Engineering Technology Innovation Center for Deep Resource Exploration in Covered Area, Ministry of Natural Resources, Hefei 230001, Anhui, China

More Information

    摘要
  • 牛王寨岩体位于大别造山带北部北淮阳构造带东端,岩性主要为花岗岩。LA-ICP MS锆石U-Pb测年结果显示,牛王寨花岗岩形成于(119.4±1.5) Ma,属于大别造山带早白垩世晚阶段岩浆活动的产物。牛王寨花岗岩具有高硅(SiO2含量为71.98％~77.96％)、高碱(全碱含量为7.66％~9.30％)、低钙(CaO含量为0.19％~0.68％)、高FeOT/MgO值(平均值为12.83)和10 000×Ga/Al值(2.63~2.82)的特点。岩石富集高场强元素,(Zr+Nb+Ce+Y)平均含量为294×10-6,富Rb、贫Ba和Sr,具有显著的Eu负异常,指示牛王寨花岗岩具有A型花岗的特点。牛王寨花岗岩87Sr/86Sr初始值为0.708 28~0.708 41,εNd(t)值为-18.77~-19.15,判断其源区物质可能为大别山中下地壳片麻岩。约130 Ma时,大别造山带加厚下地壳拆沉引发的软流圈上涌,为源区的部分熔融提供了热源。牛王寨岩体的形成受控于约130 Ma之后中国东部统一的伸展构造事件。
    Niuwangzhai granite is located in the east end of North Huaiyang in Dabie Orogen. LA-ICP MS zircon U-Pb dating indicates that the Niuwangzhai granite was emplaced at (119.4±1.5) Ma and belongs to the late-stage Early Cretaceous magmatism of Dabie Orogen. The granites are characterized with high SiO2 (71.98%~77.96%) and high alkali (7.66%~9.30%) contents, low CaO contents (0.19%~0.68%), and high FeOT/MgO (4.04~39.04, mean value of 12.83) and 10 000×Ga/Al ratios (2.63~2.82). The granites are also enriched in high field strength elements (average content of Zr+Nb+Ce+Y is 294×10-6) and Rb, but are depleted in Ba and Sr with apparent low δEu values. Geochemical features suggest that the Niuwangzhai granites can be classified into A-type granites. Combined with Sr-Nd isotopic compositions, the granites were probably derived from the gneiss in middle-lower crust of Dabie Orogen. The upwelling of asthenosphere caused by 130 Ma thickened lower crust delamination probably provided heat to melt the intermediate-acid gneiss. The formation of Niuwangzhai granite was possibly associated with extensional tectonic event of eastern China in post 130 Ma.
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