| 湘南泥盆系碳酸盐岩中锶的分布特点及其环境意义 |
| |
| 引用本文： | 刘文均.湘南泥盆系碳酸盐岩中锶的分布特点及其环境意义[J].沉积学报,1989,7(2):14-20. |
| |
| 作者姓名： | 刘文均 |
| |
| 作者单位： | 成都地质学院沉积地质矿产研究所 |
| |
| 摘 要： | 湘南泥盆系碳酸盐沉积环境,可分为台地和台盆两大类和六种相类型.250块岩样的分析结果表明,Sr和Sr/Ca×1000的含量比值变化与沉积环境密切相关,即由浅水台地相到深水台盆相,其比值从0.27增至2.37.其原因是由于不同沉积环境中碳酸盐矿物组份不同.影响了锶的分布.因此锶的含量可作为相分析的工具.
|
| 关 键 词： | 泥盆系 碳酸盐岩 锶 相标志 |
| 收稿时间： | 1987-01-20 |
THE DISTRIBUTIVE CHARACTERS AND ENVIRONMENTAL SIGNEFICANCE OF STRONTIUM IN CARBONATE ROCKS OF DEVONEAN IN SOUTHERN GUNAN |
| |
| Institution: | Institute of sedimentary Geologe and Mineral Resoureces, Chengdu Colloge of Geologe |
| |
| Abstract: | In Devonian period, southern Hunan was situated in the east margin of Hunan, Guangdong, Guangxi neritic shelf basin.During the middle__late Devonian epoch, the carbonate sediments were dominant in this area, which may be divided into two facies area: the platform and the platform__basin, and six such facies types as the restricted platform; open platform; reef; shelf, platform basin with slope margin and platform __basin. 250 samples of fresh carbonate rocks for this study were collected from seven sections of various localities and facies types.The contents of elements in carbonate rocks are detected by ICP__AES (model JA__1160). The strontium is one of the important trace elemint in carbonate rocks.The average Sr contents and Sr / Ca × 1000 ratio in different sedimentary facies are vary widely.The tendency of this varition is closely related to sedimentary environments, i.e.the Sr/ Ca× 1000 ratio tends to increase gradually form restricted platform to open platform to shelf and to platform__basin; and from shallow to bathyal, which is fromO.27 to 0.88 to 0.95__1.18 to 2.37.In the lagoon of restricted platform, the Sr/ Ca×1000 ratio of primary dolomites is higher than that of diagenetic dolomites. Several authers have noted that many ancent carbonate rodks have a wide range and a bimodal dstrivution of Sr and given various explanation for it. We agree upon the idea suggested by J.Veizer et al. (1973, 1974), who hold that in the different sedimentary environments the primary carbonate minerals are different, and the Sr content of these minerals is also various. During the diagenetic process, the content decrease with the neomorphism from instable aragonite aragonite and high-Mg calcite into stable low-Mg calcite, but the Sr content in low- Mg calcite is not to change due to it is stable. Thus a bimodal strontium distribution of carbonate rodks in various fades is caused, and may be a indicator for environments. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
