...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Canadian water resources journal >Impacts des activités minières d'amiante sur l'évolution du lac à la Truite d'Irlande, région de Thetford Mines (Québec, Canada)
【24h】

Impacts des activités minières d'amiante sur l'évolution du lac à la Truite d'Irlande, région de Thetford Mines (Québec, Canada)

机译：Impacts des activités minières d'amiante sur l'évolution du lac à la Truite d'Irlande, région de Thetford Mines (Québec, Canada)

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

Lac a la Truite (Trout Lake) from the municipality of Irlande (southern Quebec, Canada) suffers from eutrophication and siltation. More than 100 years of mining activities in the Thetford Mines region (1877-2011 CE) and the accumulation of gigantic mining waste piles have often been blamed for these problems, but their real impacts have never been demonstrated. Paleolimnological analyses were undertaken on a sediment core collected in Lac a la Truite to provide insights into its long-term evolution since pre-mining times. Results indicate that its degradation was greatly enhanced by the drainage of upstream Lac Noir (Black Lake) from 1955 to 1959 CE for mining purposes. Radiometric dating (Cs-137, Pb-210, C-14) showed that this event caused a strong increase in sediment inputs, which afterwards remained high (0.6-1.3 cm yr(-1); 0.4-1.0 g cm(-2) yr(-1)). Loss-on-ignition and spectrometry (ICP-AES/ICP-MS) analyses revealed that sediments deposited since 1960 CE mostly originate from the mining waste piles as they are organic-poor and highly enriched in metals associated with asbestos tailings (magnesium, chromium, nickel). During the drainage of Lac Noir, the emergence of diatom taxa typical of nutrient-rich waters in the sedimentary assemblages (e.g., Cyclotella meneghiniana, Cyclostephanos invisitatus) and the concomitant shift of biochemical proxies (C/N, delta C-13) indicate that the disappearance of this water body has also caused the rapid eutrophication of Lac a la Truite by facilitating municipal wastewater inputs. Moreover, the pH and conductivity of the lake water are now considerably higher than during pre-mining times. Pollution generated by the mining waste piles and wastewater must be rapidly controlled to ensure the sustainability of Lac a la Truite.

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号