Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

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第24卷    第6期    总第183期    2014年6月

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文章编号:1004-0609(2014)06-1585-14
南岭中段诸广山复式花岗岩岩石学及其控矿作用
张术根1, 2,袁 莹3,姚翠霞1, 2

(1. 中南大学 有色金属成矿预测教育部重点实验室,长沙 410083;
2. 中南大学 地球科学与信息物理学院,长沙 410083;
3. 北京矿产地质研究院,北京 100012
)

摘 要: 南岭中段诸广山复式岩体是地洼激烈期(燕山期)花岗质岩浆多次侵入产物。燕山早期主体与燕山晚期补体分别形成于地洼演化剧烈期的前半期和后半期,为古元古代陆壳物质批式部分熔融的产物,但它们动力学环境、演化过程及控矿作用差异明显。选择仁化县城口—红山地区为重点研究地段,基于地洼学说研究方法,通过现场地质调查、岩相学、岩石地球化学研究,就诸广山燕山早期主体及燕山晚期补体成岩构造环境、岩石学及控矿作用进行较详细的研究。结果表明,两期次花岗岩随构造动力环境演化,表现出不同的岩石学和地球化学特征,岩体含矿性及控矿性也有差异。燕山早期花岗岩产生于岩石圈膨胀伸展环境,以高硅、富碱、w(K2O)>w(Na2O)、准铝质、∑REE含量高为特征,成岩物质主要来源于元古代陆壳,且有幔源岩浆的混入,属A型花岗岩,与Pb-Zn-Sb-Ag矿化有关;燕山晚期花岗岩产生于岩石圈拉张减薄环境,为钙碱性,过铝质,贫Ba、Sr和Eu,属S型花岗岩,经历了高度分异演化和岩浆-流体相互作用过程,是W-Sn-Mo-(Bi)矿床的成矿母岩。

 

关键字: 花岗岩;岩石学;地球化学;构造环境;控矿作用;诸广山

Petrology and ore-control of Zhuguangshan composite granitic pluton in middle section of Nanling region
ZHANG Shu-gen1, 2, YUAN Ying3, YAO Cui-xia1, 2

1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geoscience and Info-Physics, Central South University, Changsha 410083, China;
3. Beijing Institute of Geology for Mineral Resources, Beijing 100012, China

Abstract:Zhuguangshan composite granitic pluton in the middle section of Nanling region is the intrusive product of poly-stage granitic magma in the intensive activation period (Yanshanian period) of Diwa stage. The main body intruded in the first half intensive reactivation period of Diwa stage (the early Yanshanian period), while the supplementary bodies intruded in the second half intensive reactivation period of Diwa stage (later Yanshanian stage). The main body and the complementary bodies were produced by batch partial melting of the co-source magmatic materials derived from Paleoproterozoic continental crust. The main body and the supplementary bodies suffered different geodynamic settings and evolution paths, and showed different ore-control characteristics. Chengkou—Hongshan area in Renhua county, Guangdong Province, was focused on. Through detailed field study, petrography and rock geochemistry, the generating geodynamic settings, petrology and ore-controlling of the main body and the supplementary bodies in Yanshanian periods were investigated according to the research methodology of Diwa theory. The results show that, with the evolution of tectonic dynamic environment, these granite bodies show different characteristics on petrologic, rock geochemistry, ore-bearing potential and ore-controlling. The main body is generated in the regional expansion spreading environment and its rock-forming materials are mainly derived from the Paleoproterozoic crust and also contaminated by mantle materials, which show the characteristics of A-type granite with high silicon and alkaline contents, w(K2O)>w(Na2O), quasi-aluminous property as well as REE enrichment. So, it is related to Pb-Zn-Sb-Ag mineralization. In contrast, the complementary bodies are generated in strong extension thinning environment, and experience the process of high degree differentiation and the interaction between magma and post-magmatic fluid, showing the characteristic of S-type granite with calc-alkaline and per-aluminous property, remarkable Ba, Sr and Eu depletion. So, they are the original source of W-Sn-Mo(Bi) mineralization.

 

Key words: granite; petrology; geochemistry; tectonic setting; ore-controlling; Zhuguangshan

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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