| 北祁连山白山子花岗闪长岩成岩时代 |
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| 关键词:granodiorite gold deposit metallogenic age 370±25 Ma North Qilian Mountains |
| 基金项目:本文由原地质矿产部“九五”科技攻关课题“北祁连山西段黄铁矿型铜多金属矿床与构造蚀变岩型金矿床成矿模式及找矿预侧研究”（编号：95-02-004-03）资助。 |
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| A Preliminay Study of the Petrogenic Age of Granodiorite in Baishanzhi，North Qilian Mountains |
| The Hanshan gold deposit is a tectonic altered rock type deposit discovered recently in North Qilian Mountains. The formation age of Baishanzhi granodiorite measured by U-Pb method is 370±25 Ma, indicating the Hercynian period. The metallogenic age of the Hanshan gold deposit is 213.95~339 Ma. Among the superimpositions of multi-stage hydrothermal fluids and multi-stage mineralizations, the ore-fornring hydrothermal solution of the early stage was probably provided jointly by Baishanzhi granodiorite (370±25 Ma) and Hanshan diorite (347.1±6.4 Ma). As there exist lots of intermediate-acid rocks, it is obvious that the rocks might serve as the major gold sources. The determination of the formation ages of these intrusives is of great theoretical and practical significance in search for altered rock type gold deposits in this area. |
| SONG Zhongbao,REN Youxiang,LI Zhipei,YANG Jianguo,LI Yazhi,WANG Wei.2005.A Preliminay Study of the Petrogenic Age of Granodiorite in Baishanzhi，North Qilian Mountains[J].Acta Geoscientica Sinica,26(z1):84-86. |
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