%0 Journal Article
%T 湖南道县虎子岩煌斑岩地球化学特征及其构造意义<br>Geochemical Characteristics and Tectonic Significance of Huziyan Lamprophyre in Daoxian County, Hunan
%A 梁恩云
%J Advances in Geosciences
%P 1074-1084
%@ 2163-3975
%D 2021
%I Hans Publishing
%R 10.12677/AG.2021.118103
%X 本文选择处于钦杭带中段的湖南道县虎子岩煌斑岩作为研究载体，通过地球化学特征探讨其蕴含的构造意义。虎子岩煌斑岩w(SiO<sub>2</sub>)为44.70%~49.13%，w(Na<sub>2</sub>O+ K<sub>2</sub>O)为2.21%~4.40%，w(K<sub>2</sub>O/Na<sub>2</sub>O)为1.80~4.84，属钾质–超钾质钙碱性煌斑岩。其稀土总量ΣREE为176.64 × 10？6~250.35 × 10？6，LREE/HREE平均为8.36，具轻稀土富集、重稀土亏损、轻微的Eu、Ce负异常的特点；微量元素K、Th、Nb、Ce、P、Hf、Ti为负异常，正异常的元素有Ba、U、Zr。研究认为，虎子岩煌斑岩来源于富集地幔，在晚侏罗世燕山运动的NWW向挤压转为拉张过程中沿断裂上升侵位，岩浆在经历了板块俯冲导致部分熔融和分离结晶后形成的，在成岩过程中没有发生明显的地壳混染作用。<br />
The Huziyan lamprophyre, located in the middle of Qinzhou-Hangzhou Belt, is chosen as the re-search carrier to explore its structural significance through geochemical characteristics. The Hu-ziyan lamprophyre’s contents of SiO<sub>2</sub> range from 44.70% to 49.13%, its contents of Na<sub>2</sub>O + K<sub>2</sub>O range from 2.21% to 4.40%, and its values of K<sub>2</sub>O/Na<sub>2</sub>O range from 1.80 to 4.84. It belongs to the potash-ultrapotash calc-alkaline lamprophyre. The values of ∑REE ranges from 176.64 × 10？6 to 250.35 × 10？6, and the values of LREE/HREE is 8.36 on average. It has the characteristics of LREE enrichment, HREE deficiency and Eu, Ce slight negative anomaly. The trace elements like K, Th, Nb, Ce, P, Hf, Ti have negative anomaly, and the elements like Ba, U, Zr have positive anomaly. It is considered that, the Huziyan lamprophyre is originated from the enriched mantle, and it is em-placed along the fault, made in one period of Yanshanian movement during middle and late Jurassic, and in this period the process of compression with NWW-trending changes to extension. The magma was formed by partial melting and a few separation-crystallization after the plate subduction, and here is no obvious crustal contamination during the diagenetic process.
%K 煌斑岩，地球化学特征，构造意义，钦杭带中段，虎子岩<br>Lamprophyre
%K Geochemical Characteristics
%K Tectonic Significance
%K Qinzhou-Hangzhou Belt
%K Huziyan
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=44527