桂林理工大学学报2018，Vol.38Issue(4)：640-646,7.DOI:10.3969/j.issn.1674-9057.2018.04.004
湖南江永回龙圩煌斑岩地球化学特征及其构造意义
Geochemical characteristics and tectonic significance of Huilongxu lamprophyry in Jiangyong, Hunan
摘要
Abstract
The Huilongxu lamprophyry,located in the middle of Qinzhou - Hangzhou belt,is chosen as the reseach carrier to explore its structural significance through geochemical characteristics. It belongs to the potash calc-alkaline lamprophyre(SiO2 =48. 58％ -52. 62％,Na2O + K2O = 5. 41％ - 6. 30％,K2O/ Na2O = 1. 54 - 1. 86) . The ΣREE ranges from 168. 72 ×10 - 6 to 186. 61 ×10 - 6,the average of LREE / HREE is 9. 0,which has the characteristics of light rare earth enrichment,heavy rare earth deficiency and Eu,Ce slight negative anomaly(δEu =0. 87 -0. 95,δCe = 0. 90 - 0. 94) . The trace elements Zr,Hf,Nb,Ti,Th,Ce,K,Rb are negative anomaly, and the elements with positive anomaly are U,Ba,Pb. It is considered that the Huilongxu lamprophyre was originated from the enriched mantle,and emplaced along the NWW fault made by Yanshanian movement during middle and late Jurassic. After plate subduction,the magma was formed by partial melting and a few of separation- crystallization. There is no obvious crustal contamination during the diagenetic process.关键词
煌斑岩/地球化学特征/构造意义/钦杭带中段/江永Key words
lamprophyre/geochemical characteristics/tectonic significance/Qinzhou - Hangzhou belt/Jiangyong!分类
天文与地球科学引用本文复制引用
梁恩云,陈迪,邹光均,熊苗..湖南江永回龙圩煌斑岩地球化学特征及其构造意义[J].桂林理工大学学报,2018,38(4):640-646,7.基金项目
中国地质调查局地质调查项目(DD20160032-17) （DD20160032-17）
