| 内蒙古韧性剪切带型金矿──十八顷毫矿区~(40)Ar/~(39)Ar坪年龄特征及其地质意义 |
| |
| 引用本文： | 陈洪新,孟宪刚,王建平.内蒙古韧性剪切带型金矿──十八顷毫矿区~(40)Ar/~(39)Ar坪年龄特征及其地质意义[J].矿物学报,1996(1). |
| |
| 作者姓名： | 陈洪新 孟宪刚 王建平 |
| |
| 作者单位： | 地质矿产部地质力学研究所!北京，100081，地质矿产部地质力学研究所!北京，100081，地质矿产部地质力学研究所!北京，100081 |
| |
| 基金项目： | 地矿部攻关项目!85－02－07－02 |
| |
| 摘 要： | 对采自十八顷毫金矿区的黑云母、角闪石用阶段升温法进行40Ar／39Ar年龄谱研究，结合矿区地质特征，认为黑云母近似直线年龄谱的坪年龄（277Ma）及角闪石稳定坪年龄（288Ma）代表了韧性剪切带最新活动的时代；角闪石矿物年龄谱反映的后期热扰动（268Ma）反映区域退化变质作用发生的时代，269～277Ma的年龄可能代表了与退化变质同时的金矿化时代。
|
| 关 键 词： | 黑云母 角闪石 40Ar／39Ar坪年龄 韧性剪切带 |
~(40)Ar/~(39)Ar PLATEAU AGE SPECTRA OF THE SHIBAQINGHAO GOLD DEPOSIT IN THE DUCTILE SREAR ZONE OF INNER MONGOLIA AND THEIR GEOLOGICAL IMPLICATIONS |
| |
| Chen Hongxin, Meng Xiangang, Wang Jianping.~(40)Ar/~(39)Ar PLATEAU AGE SPECTRA OF THE SHIBAQINGHAO GOLD DEPOSIT IN THE DUCTILE SREAR ZONE OF INNER MONGOLIA AND THEIR GEOLOGICAL IMPLICATIONS[J].Acta Mineralogica Sinica,1996(1). |
| |
| Authors: | Chen Hongxin Meng Xiangang Wang Jianping |
| |
| Abstract: | The Shibaqinghao gold deposit is a typical one occurring in a ductile shear zone in centralInner Mongolia. To gain a better understanding of the age of gold mineralization and its relationship with the evolution of the ductile shear zone,40Ar/39Ar plateau age analysis was made on biotitefrom biotite-quartz gneiss and on hornblende from biotite-hornblende mylonite. The 40Ar/39Arplateau age spectra of biotite are represented by nearly a straight line. The age of 277. 23 Ma standsfor the age of gold mineralization and the latest retrograde metamorphism. The 40Ar/39Ar age spectra of hornblende are normal. The age of 268. 62 Ma means the latest activity of the ductile shearzone, and the age of 268. 5~277. 23 Ma may represent the age of gold mineralization contemperaneous with the retrograde metamorphism. |
| |
| Keywords: | biotite hornblende ~(40)Ar/~(39)Ar plateau age spectra ductile shear zone |
| 本文献已被 CNKI 等数据库收录！ |
