摘要
晚侏罗世是南岭地区与花岗岩类有关钨锡矿的大规模爆发期,成岩成矿年龄集中在150~160 Ma,与成矿有关的花岗岩属于高钾钙碱性系列的花岗岩类。本文搜集了已发表的主量、微量、稀土元素和 Sr-Nd 同位素数据,根据稀土元素标准化图解将上述花岗岩划分为“海鸥式”和“斜倾式”两类,通过对比发现这两种类型花岗岩在主量元素、微量元素和Sr-Nd同位素组成上也有明显的差异。根据Ca/（Mg＋Fe）-Al/（Mg＋Fe）图解对上述两类花岗岩的物质来源进行了区分,认为“斜倾式”花岗岩的源区更为复杂。此外,依据典型矿物、SiO2-P2O5、Rb-Y、Rb-Th 图解对两类花岗岩的成因类型进行了划分。
Late Jurassic, especially 150-160 Ma, is the most important period of W-Sn polymetallic mineralization in the Nanling region. The ore bearing granitoids are alkaline and high-potassium, and their major and trace element concentrations and Sr-Nd isotopic compositions are reviewed in this contribution. The ore bearing granites can be divided into two subgroups which are characterized by “sea-gull type-” and“inclining type-” REE patterns. Moreover, the two subgroups show distinct major and trace element and Sr-Nd isotopic characteristics. Ca/（Mg＋Fe） vs. Al/（Mg＋Fe） diagram shows that the two subgroups of granites were derived from different sources. SiO2 vs. P2O5, Rb vs. Y and Rb vs. Th diagrams also demonstrate that the W and Sn bearing granites are of different genetic types.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2014年第2期301-311,共11页
Geotectonica et Metallogenia
基金
国家重点基础研究发展计划973项目“华夏地块中生代陆壳再造与巨量金属成矿”04课题(编号:2012CB416704)
国家自然科学基金面上项目“湘南晚侏罗-早白垩世花岗斑岩岩墙群的成因和地质意义”(批准号:41273043)
地质调查工作项目“南岭西段与锡矿有关花岗岩成因及壳幔相互作用研究”(编号:1212011220523)资助
关键词
含钨锡矿花岗岩
成因类型
晚侏罗世
南岭地区
granites related to W-Sn deposits
genetic type
the Late Jurassic
the Nanling region
