Laser probe ^(40)Ar-^(39)Ar ages of metasomatic K-feldspar from the Hougou gold deposit,northwestern Hebei Province,China  

作　　者：徐兴旺 张宝林 蔡新平 刘玉林 

出　　处：《Science China Earth Sciences》2002年第6期559-564,共6页中国科学（地球科学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No.49802021)

摘　　要：The Hougou gold deposit in northwestern Hebei is a typical K-metasomatism-related gold deposit hosted by K-altered rocks overprinting alkali intrusive rocks. In order to determine the age and pulse intervals of K-metasomatism in this gold deposit, some metasomatic K-feldspars from K-altered rocks are selected to measure their formation time by laser probe 40Ar-39Ar dating method. The new analyzing data show that these metasomatic K-feldspar formed during 202.6 Ma and 176.7 Ma, and the corresponding K-metasomatism and associated gold mineralization occurred in the early stage of Mesozoic era. The pulse intervals of K-metasomatism in the Hougou area are estimated to be about 4 Ma.The Hougou gold deposit in northwestern Hebei is a typical K-metasomatism-related gold deposit hosted by K-altered rocks overprinting alkali intrusive rocks. In order to determine the age and pulse intervals of K-metasomatism in this gold deposit, some metasomatic K-feldspars from K-altered rocks are selected to measure their formation time by laser probe 40Ar-39Ar dating method. The new analyzing data show that these metasomatic K-feldspar formed during 202.6 Ma and 176.7 Ma, and the corresponding K-metasomatism and associated gold mineralization occurred in the early stage of Mesozoic era. The pulse intervals of K-metasomatism in the Hougou area are estimated to be about 4 Ma.

关 键 词：40AR-39AR age  laser probe  metasomatic K-feldspar  Hougou gold deposit. 

分 类 号：P618.51[天文地球—矿床学]