广东大宝山矿区横石河沿岸水土重金属分布规律及其累积风险     

宿文姬  ;徐友宁  ;凡生  ;付善明 《中国区域地质》2014,(8):1231-1238

研究矿业活动重金属的释放、迁移及累积特征对于控制和治理矿区水土环境污染具有重要的意义。本文通过广东大宝山矿区水土污染源调查及横石河流域沿岸水土样品采集,以研究区土壤对照值及国家环境质量为标准,试图探讨了大宝山矿区重金属迁移及累积特征。研究结果表明,横石河沿岸土壤重金属元素主要来自采矿活动的酸性废水的排放,土壤中Cd、Pb、Cu和Zn的含量均超过对照值,呈现出明显的累积特征,且Cd、Cu含量超过了国家土壤环境质量标准;土壤中重金属累积程度及其风险等级呈现出从源头向下游递减的特点,其中凉桥、水楼下地段农田重金属处于高风险区,阳河-莲心村虽有累积,但无风险;上坝村地处土壤重金属累积的中风险区,下坝村处于低风险区。研究结果为矿区重金属污染防治提供了重要依据。  相似文献   

安徽宁国张村地区锑矿床控制因素及成因     

章贤能  寇尚文 《江苏地质》2017,41(2):183-191

安徽宁国张村锑矿处于江南造山带北东端,是近年发现的锑矿床。锑矿赋存于后南华系盖层张性滑脱断层中,控矿断层下盘为早寒武世荷塘组炭质硅质泥岩及震旦—寒武纪皮园村组硅质岩,上盘为寒武—奥陶纪西阳山组泥质灰岩夹透镜状微晶灰岩、晚寒武世华严寺组灰岩。张村锑矿成矿地质体为角砾岩,成矿结构面为北西向张性断层。断层是含矿热液流动的通道,Sb丰度值高的西阳山组泥质灰岩是锑矿的形成基础,且灰岩性脆易碎,在地质营力作用下形成裂隙,有利于天水及深部热液流体循环萃取矿质。锑矿自然类型为辉锑矿化角砾岩,局部夹有充填型块状辉锑矿,矿床成因初步定为低温热液脉状充填矿床。  相似文献   

Potential for sustainable sea transport: A case study of the Southern Lomaiviti,Fiji islands     

《Marine Policy》2017

This paper outlines research on the sea transport need and potential options for the future for the islands of Gau, Batiki and Nairai, Southern Lomaiviti, Fiji. Sea transport is vital for this island group but is limited to infrequent commercial ferry services and outboard driven punts. The Fiji Government subsidises the ferries through its Shipping Franchise Scheme to ensure commercial operators service the route. The absence of commercial development within the group has meant high biodiversity and cultural values have been preserved and there are a number of projects, especially on Gau, with a common aim of building resilience or ‘climate change proofing’ the communities and their island environments. These projects are focused on supporting local communities to maintain well-being through improved reliance on local and natural assets. It is logical to add analysis of low carbon sea transport options to these initiatives. Lomaiviti has been selected as representative of a number of isolated Maritime Provinces in the Pacific. This paper is expected to pave the way for greater research in this field and assist in solving the crippling effect of the region's current fossil fuel dependency.  相似文献