黄金科学技术 ›› 2024, Vol. 32 ›› Issue (1): 31-40.doi: 10.11872/j.issn.1005-2518.2024.01.004
刘风龙1(),王加恩2,刘远栋3,孙大亥3,程海燕3,胡艳华3,黄雯2,王振3,潘少军3
Fenglong LIU1(),Jia’en WANG2,Yuandong LIU3,Dahai SUN3,Haiyan CHENG3,Yanhua HU3,Wen HUANG2,Zhen WANG3,Shaojun PAN3
摘要:
在浙江西部九华山一带开展区域地质调查工作的基础上,选择九华山花岗岩岩体开展了LA-ICP-MS锆石U-Pb测年,获得岩体的加权平均年龄为(132.7±4.3)Ma,属于早白垩世岩体。采用同位素年代学和岩石地球化学等研究手段,对九华山岩体年龄进行重新解剖,分析其地球化学特征和Sr-Nd同位素特征,并探讨岩浆源区。结果表明:九华山岩体具有高硅、富铝碱、相对富钾贫钠和贫钙镁等特点;SiO2含量为68.58%~72.21%,具有准铝质—过铝质和高钾钙碱性—钾玄岩系列特征;微量元素分布表现出明显的Sr、Ba、Ti和P负异常,稀土元素分布表现出明显的负Eu异常,具有典型A型花岗岩的特征。岩体样品的εNd(t)值为-6.3~-5.8,平均值为-6.0,二阶段模式年龄TDM2(Nd)为1.34~1.43 Ga,平均值为1.40 Ga。研究表明:岩体的岩浆来源主要为中元古代基底物质,加入了一定的幔源物质,具有壳—幔混合特征。
中图分类号:
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