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

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第25卷    第3期    总第192期    2015年3月

[PDF全文下载]        

    

文章编号:1004-0609(2015)03-0776-10
豫南姚冲钼矿床二长花岗岩锆石微量元素特征及其地质意义
刘清泉1, 2, 3, 4,张 宇1, 2,张智慧3,李 冰3,张 驰3

(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. 河南省有色金属矿产探测工程技术研究中心,郑州 450016;
4. 河南省有色金属地质勘查总院,郑州 450052
)

摘 要: 姚冲钼矿床位于东秦岭-大别山钼成矿带上,矿体产于外接触带大别片麻杂岩中。对姚冲钼矿床成矿岩体的二长花岗岩开展了锆石Ce4+/Ce3+比值、Ce/Ce*及Eu/Eu*值的研究。结果表明,二长花岗岩的锆石Ce4+/Ce3+比值范围为188~676,平均值为384;锆石Ce/Ce*值范围为29.88~254.37,平均值为113.94;锆石Eu/Eu*值介于0.38~0.66之间,平均值为0.58,反映出与成矿作用有关的岩浆具有较高的氧逸度。锆石Ti含量温度范围为623.6~762.3 ℃,显示中酸性岩浆温度特征。姚冲成矿岩体源于扬子板块拆沉作用,导致软流圈上涌诱发加厚时地壳部分熔融产生的高氧逸度花岗质岩浆,高氧逸度岩浆在上升侵位的过程中,受到上部壳源物质的混染,岩浆在之后的结晶分异过程中产生富含Mo的岩浆热液流体,随着流体的运移,在合适地质条件下完成成岩成矿作用。

 

关键字: 姚冲钼矿床;二长花岗岩;锆石;微量元素

Ziron trace element characteristics and its implication of monzogranite in Yaochong Mo deposit, Southern Henan, China
LIU Qing-quan1, 2, 3, 4, ZHANG Yu1, 2, ZHANG Zhi-hui3, LI Bing3, ZHANG Chi3

1. Key Laboratory of Nonferrous Metal Ore Forecast, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info physics, Central South University, Changsha 410083, China;
3. Non-Ferrous Mineral Exploration Engineering Research Center of Henan Province, Zhengzhou 450016, China;
4. Henan Institute of Geological Exploration for Non-ferrous Metal, Zhengzhou 450052, China

Abstract:Yaochong Mo deposit locates at the Qinling-Dabie metallogenic belt, the deposit is hosted by Dabie metamorphic complex at the exocontact zone. The results show that, the values of Ce4+/Ce3+, Ce/Ce* and Eu/Eu* of zircons in monzogranite from Yaochong Mo deposit are from 188 to 676, 29.88 to 254.37, 0.38 to 0.66, and the average values are 384, 113.94 and 0.58, respectively, which suggests that magma has the characteristics of high oxygen fugacity. Ti content temperature of zircons is from 623.6 ℃ to 762.3 ℃, which is temperature characteristics of middle-acidic magma. The ore-forming rock is from the granitic magma with high oxygen fugacity derived from the patial melting of ancient crust triggered by asthenosphere upwelling, and the granitic magma with high oxygen fugacity is contaminated by the earth’s crust material during the process of emplacement, and then the magma produces magmatic hydrothermal fluid with rich Mo, which causes that diagenetic and mineralization came out in the proper geological conditions with the fluid migration.

 

Key words: Yaochong Mo deposit; monzogranite; zircon; trace element

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

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

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com