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浙江统里地区早白垩世花岗岩体锆石U-Pb年龄、地球化学及其成因
投稿时间:2020-06-23  修订日期:2020-11-20  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021060
摘要点击次数: 81
全文下载次数: 116
作者单位地址
陈焕元 浙江省核工业二六二大队 浙江省湖州市环渚路666号
贾飞 浙江省核工业二六二大队 
中文摘要:浙江省内发育着众多中-大型萤石矿,但是对成矿岩体的研究相对较弱,本文首次对安吉统里地区萤石成矿花岗岩体进行了系统的锆石U-Pb年代学和地球化学研究。锆石U-Pb测年结果显示小圩坞花岗闪长岩形成于146-140Ma,而五房里细粒二长花岗岩形成于135Ma,二者均形成于早白垩世早期,与区域上大规模爆发的晚中生代岩浆作用时代相一致。全岩主微量元素地球化学表明统里地区花岗岩体可以划分为钙碱性I型花岗岩和高分异I型花岗岩两类。研究认为小圩坞I型花岗岩是变火成岩中下地壳熔融的产物,而五房里高分异I型花岗岩是花岗质岩浆在浅层岩浆房内经历广泛结晶分异作用的产物。结合华南地区晚中生代岩浆作用由陆向海迁移的趋势,本文研究认为古太平洋板块俯冲过程中的板片回转过程是统里地区花岗岩侵入最为合理的深部动力学机制。
中文关键词:浙西北  早白垩世  花岗岩  锆石U-Pb定年  地球化学  岩石成因
 
Formation Age, Geochemical Signatures and Geological Significance of Early Cretaceous Granites from Tongli Area, Zhejiang
Author NameAffiliationAddress
Chen Huan-yuan Zhejiang Province Nuclear Industry 262 Brigade 浙江省湖州市环渚路666号
Jia Fei Zhejiang Province Nuclear Industry 262 Brigade 
Abstract:Recently, many medium - and large-scale fluorite deposits were identified in Zhejiang Province. However, the research on metallogenic rock mass is still relatively weak. In this paper, we report new zircon U–Pb geochronologic and whole-rock major and trace element data, for the Xiaoxuwu and Wufangli granites of the Tongli area of Northwest Zhejiang. The zircon U–Pb dating yielded magmatic crystallization ages of 145-140 and 135 Ma for Xiaoxuwu monzogranites and Wufangli fine-grained monzogranites, respectively. These new age data indicate that the Tongli plutons emplacement in the early Early Cretaceous, coeval with the regional late Mesozoic magmatism. Geochemically, the samples can be divided into two groups of calc-alkaline I-type and highly fractionated I-type granites. Our research indicated that the Xiaoxuwu I-type granites were derived by partial melting of metaigneous lower-crustal source while the Wufangli highly fractionated I-type granites underwent extensive fractional crystallization in the shallow magma chamber. Combined with the oceanward migration of late Mesozoic magmatic activity, we believe the slab rollback during oceanic subduction of paleo-Pacific was a reasonable explanation for the magmatism in Tongli area.
keywords:Northwest Zhejiang  Early Cretaceous  zircon U?Pb dating  geochemistry  petrogenesis
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