Preliminary investigation of sphalerite ar-40-(39) ar dating by crushing in vacuum: a case study from the fankou pb-zn deposit, guangdong province
文献类型：期刊论文
| 作者 | Jiang YingDe; Qiu HuaNing; Xiao HuiJuan |
| 刊名 | Acta petrologica sinica
 |
| 出版日期 | 2006-10-01 |
| 卷号 | 22期号:10页码:2425-2430 |
| 关键词 | Ar-40-ar-39 technique Sphalerite Fluid inclusion Inverse isochron Fankou lead-zinc deposit |
| ISSN号 | 1000-0569 |
| 通讯作者 | Jiang yingde(jydesu@163.com) |
| 英文摘要 | In order to investigate the possibility of dating fluid inclusions in sphalerite using the ar-40-ar-39 technique by crushing in vacuum, a sphalerite sample (04fk-11sp) from the fankou pb-zn deposit was analyzed. the crushing experiment forms a falling-down age spectrum. the apparent ages decline remarkably in the first five steps and a plateau yields in the last 11 steps (7 to 17). two well-defined isochron lines are obtained on the inverse isochron diagram of ar-36/ar-40 vs. ar-39/ar-40. the ar-40-ar-39 data of steps i to 5 define an isochron line with an age of (233.6 +/- 7.4) ma (1 sigma) and an initial ar-40/ar-36 ratio of 703 +/- 27. this isochron age is interpreted as the age of the secondary fluid inclusions formed by a post-mineralization hydrothermal event, and the high ar-40/ar-36 ratio of 703 27 indicates that excess ar-40 trapped into the sphalerite during the post-mineralization history associated with the fluid which formed the secondary fluid inclusions. data points of steps 7 to 17 yield another well-defined isochron line with an isochron age of (265.8 +/- 1.0) ma and an initial ar-40/ar-16 ratio of 291 +/- 2. this initial ratio, close to that of the modern atmosphere, indicates that no excess 40ar is present within the primary inclusions. the isochron age of (265.8 +/- 1.0) ma is well concordant with the plateau age of (264.4 +/- 0.7) ma (ar-39 released 49.2%), implying that a mineralization epoch of the fankou pb-zn deposit took place in the middle permian. this is the first time to distinguish the primary fluid inclusions from the secondary ones and obtain their real ages respectively. this preliminary study shows that sphalerite ar-40-ar-39 in vacuo crushing technique is an effective approach to obtain the sulphide mineralization ages. |
| WOS关键词 | RB-SR ; COPPER-DEPOSITS ; ORE-DEPOSITS ; SM-ND ; AGE ; PYRITE ; SAMPLES ; MINERALIZATION ; GEOCHRONOLOGY ; INCLUSIONS |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000242107500001 |
| 出版者 | SCIENCE CHINA PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2379794 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Jiang YingDe |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Peoples R China 2.Grad Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jiang YingDe,Qiu HuaNing,Xiao HuiJuan. Preliminary investigation of sphalerite ar-40-(39) ar dating by crushing in vacuum: a case study from the fankou pb-zn deposit, guangdong province[J]. Acta petrologica sinica,2006,22(10):2425-2430. |
| APA | Jiang YingDe,Qiu HuaNing,&Xiao HuiJuan.(2006).Preliminary investigation of sphalerite ar-40-(39) ar dating by crushing in vacuum: a case study from the fankou pb-zn deposit, guangdong province.Acta petrologica sinica,22(10),2425-2430. |
| MLA | Jiang YingDe,et al."Preliminary investigation of sphalerite ar-40-(39) ar dating by crushing in vacuum: a case study from the fankou pb-zn deposit, guangdong province".Acta petrologica sinica 22.10(2006):2425-2430. |
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来源：中国科学院大学
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