文章摘要
李山坡,李肖龙,潘小娜,杜程远,毛帅,王超,宁勇,宋玮,鲁培庆,崔振.豫西外方山太山庙花岗岩LA-ICP-MS锆石U-Pb年龄、Hf同位素组成及其地质意义[J].矿产勘查,2022,13(8):1055-1066
豫西外方山太山庙花岗岩LA-ICP-MS锆石U-Pb年龄、Hf同位素组成及其地质意义
LA-ICP-MS zircon U-Pb geochronology, Hf isotope composition and geological implication of the Taishanmiao granite in Waifangshan area, western Henan Province
投稿时间：2022-06-01  
DOI：10.20008/j.kckc.202208001
中文关键词: 碱性花岗岩  锆石U-Pb年龄  Hf同位素  太山庙  豫西
英文关键词: alkaline granite  LA-ICP-MS  Hf isotope  Taishanmiao  western Henan Province
基金项目:本文受河南省自然资源厅2020年度省财政自然资源科研项目(2020-165-3)资助。
作者单位
李山坡 河南省地质调查院, 河南 郑州 450001
河南省金属矿产成矿地质过程与资源利用重点实验室, 河南 郑州 450001 
李肖龙 河南省地质调查院, 河南 郑州 450001
河南省金属矿产成矿地质过程与资源利用重点实验室, 河南 郑州 450001 
潘小娜 河南省自然资源科学研究院, 河南 郑州 450016 
杜程远 河南省资源环境调查五院, 河南 郑州 450053 
毛帅 湖北省地质局第三地质大队, 湖北 黄冈 438000 
王超 湖北省地质局第三地质大队, 湖北 黄冈 438000 
宁勇 河南省地质调查院, 河南 郑州 450001 
宋玮 河南省地质调查院, 河南 郑州 450001 
鲁培庆 河南省地质调查院, 河南 郑州 450001 
崔振 河南省地质调查院, 河南 郑州 450001
河南省金属矿产成矿地质过程与资源利用重点实验室, 河南 郑州 450001 
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中文摘要:
      位于豫西外方山的太山庙花岗岩是区域上重要的碱性花岗岩,根据接触关系、岩石学特征等,该岩体可识别出5期岩浆侵入活动,分别为中斑状中粗粒黑云母正长花岗岩、中斑状细中粒黑云母正长花岗岩、不等粒正长花岗岩、多斑状正长花岗斑岩及正长花岗斑岩,其中第一期中斑状中粗粒黑云母正长花岗岩构成主体,而其它4期侵入岩在多处呈偏心套叠式产于其中。本文对太山庙岩体第一期和第二期花岗岩开展了LA-ICP-MS锆石U-Pb测年、Hf同位素测试。结果显示,太山庙花岗岩第一期、第二期侵入时间分别为(121.3±1.6) Ma、(119.6±1.8) Ma,是华北克拉通南缘早白垩世大规模岩浆活动的记录。锆石的εHf(t)为-4.56~-16.97(t=121~120 Ma),二阶段模式年龄为2247~1464 Ma。结合与该区域上的结晶基底太华岩群、第一盖层熊耳群以及秦岭造山带主要构造块体的Hf同位素数据对比结果,认为太山庙花岗岩体的源区可能主要为俯冲到华北克拉通南缘下部地壳的南秦岭陡岭群等和扬子克拉通张八岭群等古老基底。太山庙岩体原始岩浆可能富含锡、铀等成矿元素,并在演化过程中进行了初步富集,这可能是岩体及其接触带附近发育锡、铀、三稀元素异常,以及钼、锡、铅、锌等矿床(点)的原因。建议下一步重点针对这些异常区开展找矿工作。
英文摘要:
      The Taishanmiao granitic batholith, located in the Waifangshan area in western Henan Province, is an important alkaline granite in the region. It can be divided into five intrusive activities, from early to late, including medium-to coarse-grained biotite syenogranite, medium-to fine-granited biotite syenogranite, unequal grained syenogranite, phenocryst-rich syenogranite porphyry and syenogranite porphyry. The first intrusive unit constitutes the main body, and the other intrusive units occur in eccentric overlap in many places. In order to further understanding the generation of this batholith, LA-ICP-MS zircon U-Pb dating and Hf isotope studies were carried out. The results show that the first and second intrusion units of the Taishanmiao granitic batholith are(121.3±1.6) Ma and(119.6±1.8) Ma respectively, representing the record of Early Cretaceous large-scale magmatism in the southern margin of the North China Craton. Zircon εHf(t) is ranging from -4.56 to -16.97, and the two-stage model age ranges 1464~2247 Ma, indicating that magma source mainly came from ancient continental crust materials. The Hf isotopic comparison with the Taihua Group, the Xionger Group and the main structural blocks of the Qinling orogenic belt in this area shows that the source area of the Taishanmiao granitoid may be the ancient basement of the South Qinling and the Yangtze Craton subducted to the lower crust of the southern margin of the North China Craton. The original magma of Taishanmiao batholith may be rich in tin, uranium and other ore-forming elements, and they have preliminary enriched during the magma evolution process, which may be the reason for the development of tin, uranium, rare earth elements and rare elements anomalies, as well as molybdenum, tin, lead, zinc occurences, near the batholith and its contact zones. Therefore, we suggested that the anomaly regions around the batholith may be the better prospecting area.
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