收稿日期: 2023-01-03
修回日期: 2023-06-27
网络出版日期: 2024-03-22
基金资助
中国地质调查局项目“浙江省杜泽镇(H50E018020);大同镇(H50E017021);兰溪市(H50E017022);汤溪镇(H50E018022);金华市(H50E018023┫1∶5万区域地质矿产调查”项目┣12120113065000);“浙江1∶5万双溪镇、丽水市、大港头镇、章村幅区域地质调查”项目(1212011120869)
Geochronology and Geochemistry Characteristics of Jiuhuashan Intrusion Rocks in Quzhou,Zhejiang Province
Received date: 2023-01-03
Revised date: 2023-06-27
Online published: 2024-03-22
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。
刘风龙 , 王加恩 , 刘远栋 , 孙大亥 , 程海燕 , 胡艳华 , 黄雯 , 王振 , 潘少军 . 浙江衢州九华山侵入岩年代学和地球化学特征[J]. 黄金科学技术, 2024 , 32(1) : 31 -40 . DOI: 10.11872/j.issn.1005-2518.2024.01.004
The Jiangshan-Shaoxing tectonic belt is characterized by the development of numerous Late Cretaceous acidic volcanic-intrusive rock masses,such as Baijuhua granite,Cuishan granite,and Dazhou rhyolite.Previous studies on the chronology of these rocks indicate that they were formed between 137~126 Ma,and the geochemical studies show that these rock masses have geochemical characteristics of A-type granites.These studies are of significant geological importance for understanding the genesis and tectonic background of the rock bodies in the Jiangshan-Shaoxing tectonic belt.Based on the regional geological survey in the Jiuhuashan area of western Zhejiang Province,LA-ICP-MS zircon U-Pb dating of Jiuhuashan granite rock mass was carried out,the results indicate that the Jiuhuashan rock mass was formed in (132.7±4.3)Ma,which is the product of early Cretaceous volcanic activity.By means of isotope chronology and rock geochemistry,the diagenetic age of Jiuhuashan rock mass was re-dissected,its geochemical charateristics and Sr-Nd isotope charateristics were analyzed,and the magma source area was discussed.The results show that the Jiuhuashan rock mass has the characteristics of high silicon,rich aluminum alkali,relatively high potassium and low sodium,and low calcium and magnesium.The content of SiO2 is 68.58%~72.21%,which has the characteristics of quasi-aluminous-peraluminous and high-potassium calc-alkaline-basalt series.The distribution of trace elements shows significant negative anomalies in Sr,Ba,Ti,and P,and the distribution of rare earth elements shows obvious negative Eu anomalies,which has the typical features of A-type granites.The εNd(t) values of the rock samples range from -6.3 to -5.8,with an average value of -6.0 and the two-stage model age TDM2(Nd) ranges from 1.34 Ga to 1.43 Ga,with an average of 1.40 Ga.The results show that the magma source of the rock mass is mainly the Mesoproterozoic basement,but some mantle-derived material is added,which has the characteristics of crust-mantle mixing.
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