摘要
在J_3-K_1时期形成的江西会昌岩背火山穹窿由火山岩(熔结凝灰岩)、次火山岩(次流纹斑岩)和侵入岩(花岗岩和花岗斑岩)组成.大型斑岩锡矿床赋存于含黄玉花岗岩与次流纹斑岩的内外接触带上.成矿岩体花岗斑岩或黄英岩具过铝质(指示原生矿物为黄玉)、富Si,F,K,Rb,REE,Zr,Hf,Sn和W,贫Mg,Ti,Na,Sr,Eu和Cl等,具有高的F/Cl,Rb/Sr,Fe/Mg和I_(sr)值以及低的NK/A,Na_2O/K_2O和ε_(Nd)值,成因上与壳源(S型)火成岩相似.
The volcanic-tectonic dome in Yinbei area of Huichang county of Jiangxi province formed during J3 to K_1 period is composed of a series of volcanic, subvokanic and intrusive rocks. The porphyry type tin deposit on a large scale occurs at contact zones inside or outside between the topaz-bearing granitic porphyry and subvolcanic rhyolitic porphyry. The.ore-forming porphyries and granites are peraluminous with topaz mineral as their peraluminous indicator. In geochemistry, they are characteristically rich in Si, F, K, Rb, REE, Zr, Hf, Sn, W and poor in Mg, Ti, Na, Sr, Eu, Cl, and usually have a higher F / Cl, Rb/ Sr, Fe/ Mg ratios and Isr values, and a lower NK / A, Na_2O / K_2O ratios and ε_(Nd)(T) values. According to the evidence mentioned above, the Yinbei volcanic-intrusive complex is similar to S type igneous rocks in geneses.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
1993年第4期638-650,共13页
Journal of Nanjing University（Natural Science）
基金
国家自然科学基金(49070092)研究成果之一
关键词
火成岩
斑岩锡矿
地球化学
igneous rock
porphyry tin deposit
geochemistry
