新疆祁漫塔格于沟子铁多金属矿辉钼矿Re-Os年龄及其地质意义   总被引：1，自引：0，他引：1  

周建厚 《地质与勘探》2014,50(1):1-7

[摘 要]于沟子铁-稀有多金属矿区位于东昆仑祁漫塔格矿集区西段,其中铁铜（钼）多金属矿体主要分布于正长花岗岩与狼牙山组碳酸盐岩的接触带矽卡岩内,属于矽卡岩型铁铜（钼）多金属矿床,而铌（铷）等稀有-稀土矿化带分布于正长花岗岩和二长花岗岩内。通过对于沟子铁铜（钼）多金属矿体内磁铁矿石中的辉钼矿Re-Os定年表明,辉钼矿中含有对Re-Os定年产生较大影响的普通Os,在扣除普通Os后,辉钼矿Re-Os等时线年龄为（210.1±4.8）Ma（n=5,MSWD=0.37）,厘定了其成矿年龄为晚三叠世,是东昆仑祁漫塔格印支期大规模成矿的产物。  相似文献   

Good luck or good governance? The recovery of Celtic Sea herring     

《Marine Policy》2017

The herring stock in the Celtic Sea collapsed in 2004. The stock is managed under the European Union's (EU) Common Fisheries Policy (CFP), but with a large measure of local stakeholder involvement through the Pelagic Advisory Council and a local Irish stakeholder committee. An iterative process, initiated by the local committee culminated in a formal rebuilding plan, which ran until 2012, by which time, the stock had fully recovered. Subsequent analyses of stock development over this period suggest that the stock was already recovering by the time the final plan was implemented. Did the stock rebuild by good fortune or did the governance measures put in place achieve their aims? This question is answered by way of examination of stock trends over time, analyses of the main elements of the rebuilding measures, including a management strategy evaluation (MSE) along with analyses of the legal and institutional arrangements in Ireland and in the EU CFP, including the development of the Pelagic Advisory Council. Important innovations in the CFP are revealed as having been crucial for the rebuilding process.  相似文献   

Aquaculture stakeholders role in fisheries co-management     

《Marine Policy》2017

Industrial aquaculture has become one of the main protagonists both on the coasts and in international policy aimed at regulating matters concerning the sea. This new role is reflected in the recently adopted Common Fisheries Policy of the European Union, where the need to promote the sector and the involvement with other local actors, specifically artisanal fishers, is highlighted. However, the official promotion of this activity could be overvaluing its benefits while, at the same time, undervaluing the new barriers that it is introducing in fisheries co-management. Centered in Valencian Community (Spain) and through a qualitative methodology, this paper examines the views and positions of stakeholders directly involved in aquaculture activity (biologists, aquaculture businessmen and policy managers) on the possibilities of joint participation. It is concluded, that eroding the detected mistrust among stakeholders through "hybrid forms of participation" would be a necessary prerequisite to setting up a common framework for involvement leading to an effective co-management.  相似文献   

Drivers of successful common-pool resource management: A conjoint experiment on groundwater management in Brazil     

《Global Environmental Change》2022

Carefully designed common-pool resource (CPR) management systems can improve water security, but many NGOs and governments do not have the resources and logistical capacity to implement all important features of a system at once. In addition, users’ perception of management features is important to increase buy-in and adoption of a new system. Which aspects of a commons management system do users perceive to be most important? We conduct a conjoint survey experiment about groundwater management with rural residents in the semi-arid region of Northeast Brazil. We randomly vary five features of a water management system: 1) discussion, 2) social sanctions for overuse, 3) rules and penalties, 4) payment, 5) monitoring and dissemination of conditions to users. Each feature increases perceived likelihood of collective well management and individual water conservation. We find that features act as complements or substitutes; in particular, discussion complements monitoring, and payment substitutes for rules. Our results have implications for how to study and prioritize the features of CPR management systems to improve water security in other rural, semi-arid regions with groundwater reliance when it is infeasible to implement all recommended features.  相似文献