^40Ar-^39Ar Isotopic Dating of the Xianghualing Sn-polymetallic Orefield in Southern Hunan, China and Its Geological Implications |
| |
作者姓名: | YUAN Shun PENG Jiantang SHEN Nengping HU Ruizhong and DAI Tongmo State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang Guizhou Graduate School Chinese Academy of Sciences Beijing Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Guangdong |
| |
作者单位: | YUAN Shunda,PENG Jiantang,SHEN Nengping,HU Ruizhong and DAI Tongmo State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou 550002 Graduate School,Chinese Academy of Sciences,Beijing 100039 Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong 510640 |
| |
基金项目: | 中国科学院基金
,
国家自然科学基金 |
| |
摘 要: | The Xianghualing Sn-polymetallic orefield in Hunan Province, southern China, is a large-size tin orefield. Although numerous studies have been undertaken on this orefield, its genesis, mineralization age, and tectonic setting are still controversial, mainly because of the lack of reliable geochronological data on tin mineralization. The 40Ar/39Ar stepwise heating dating method was first employed on muscovite from different deposits in this orefield. The muscovite sample from the Xianghualing Sn-polymetallic deposit defines a plateau age of 154.4±1.1 Ma and an isochron age of 151.9±3.0 Ma; muscovite from the Xianghuapu W-polymetallic deposit yields a plateau age of 161.3±1.1 Ma and an isochron age of 160.0±3.2 Ma; muscovite from the Jianfengling greisen-type Sn-polymetallic deposit gives a plateau age of 158.7±1.2 Ma and an isochron age of 160.3±3.2 Ma. The tungsten-tin mineralization ages in the Xianghualing area are therefore restricted within 150-160 Ma. The tungsten -tin mineralization in Xianghualing occurred at the same time as the regional tin-tungsten mineralization including the Furong tin orefield, Shizhuyuan tungsten-tin polymetallic deposit and Yaogangxian tungsten-polymetallic deposit. Thus, the large-scale tungsten-tin metallogenesis in South China occurring at 160-150 Ma. probably is closely related to asthenospheric upwelling and crust-mantle interaction under a geodynamic setting of crustal extension and lithosphere thinning during the transformation of tectonic regimes during the Mid-Late Jurassic.
|
关 键 词: | 湖南南部 香花岭矿田 锡-多金属矿田 年代学 氩同位素测年 地质意义 |
收稿时间: | 2006-03-16 |
修稿时间: | 2006-12-07 |
^40Ar-^39Ar Isotopic Dating of the Xianghualing Sn-polymetallic Orefield in Southern Hunan, China and Its Geological Implications |
| |
Authors: | YUAN Shund PENG Jiantang SHEN Nengping HU Ruizhong and DAI Tongmo State Key Laboratory of Ore Deposit Geochemistry |
| |
Institution: | YUAN Shund,PENG Jiantang,SHEN Nengping,HU Ruizhong and DAI Tongmo State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou Graduate School,Chinese Academy of Sciences,Beijing Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong |
| |
Abstract: | Abstract: The Xianghualing Sn‐polymetallic orefield in Hunan Province, southern China, is a large‐size tin orefield. Although numerous studies have been undertaken on this orefield, its genesis, mineralization age, and tectonic setting are still controversial, mainly because of the lack of reliable geochronological data on tin mineralization. The 40Ar/39 Ar stepwise heating dating method was first employed on muscovite from different deposits in this orefield. The muscovite sample from the Xianghualing Sn‐polymetallic deposit defines a plateau age of 154.4±1.1 Ma and an isochron age of 151.9±3.0 Ma; muscovite from the Xianghuapu W‐polymetallic deposit yields a plateau age of 161.3±1.1 Ma and an isochron age of 160.0±3.2 Ma; muscovite from the Jianfengling greisen‐type Sn‐polymetallic deposit gives a plateau age of 158.7±1.2 Ma and an isochron age of 160.3±3.2 Ma. The tungsten‐tin mineralization ages in the Xianghualing area are therefore restricted within 150–160 Ma. The tungsten ‐tin mineralization in Xianghualing occurred at the same time as the regional tin‐tungsten mineralization including the Furong tin orefield, Shizhuyuan tungsten‐tin polymetallic deposit and Yaogangxian tungsten‐polymetallic deposit. Thus, the large‐scale tungsten‐tin metallogenesis in South China occurring at 160‐150 Ma, probably is closely related to asthenospheric upwelling and crust‐mantle interaction under a geodynamic setting of crustal extension and lithosphere thinning during the transformation of tectonic regimes during the Mid‐Late Jurassic. |
| |
Keywords: | Ar-Ar age muscovite Sn-polymetallic orefield Xianghualing Hunan lithosphere extension |
本文献已被 CNKI 万方数据 等数据库收录! |
| 点击此处可从《Acta Geologica Sinica》浏览原始摘要信息 |
| 点击此处可从《Acta Geologica Sinica》下载免费的PDF全文 |