The Yamansu belt,an important tectonic component of Eastern Tianshan Mountains,of the Central Asian Orogenic Belt,NW China hosts many Fe-(Cu)deposit.In this study,we present new zircon U-Pb geochronology and geochemic...The Yamansu belt,an important tectonic component of Eastern Tianshan Mountains,of the Central Asian Orogenic Belt,NW China hosts many Fe-(Cu)deposit.In this study,we present new zircon U-Pb geochronology and geochemical data of the volcanic rocks of Shaquanzi Formation and diorite intrusions in the Yamansu belt.The Shaquanzi Formation comprises mainly basalt,andesite/andesitic tuff,rhyolite and sub-volcanic diabase with local diorite intrusions.The volcanic rocks and diorites contain ca.315-305 Ma and ca.298 Ma zircons respectively.These rocks show calc-alkaline affinity with enrichment in large-ion lithophile elements(LILEs),light rare-earth elements(LREEs),and depletion in high field strength elements(HFSEs)in primitive mantle normalized multi-element diagrams,which resemble typical back-arc basin rocks.They show depleted mantle signature with ε_(Nd)(t)ranging from+3.1 to +5.6 for basalt;+2.1 to+4.7 for andesite;-0.2 to+1.5 for rhyolite and the ε_(Hf)(t)ranges from-0.1 to +13.0 for andesites;+5.8 to +10.7 for andesitic tuffs.We suggest that the Shaquanzi Formation basalt might have originated from a depleted,metasomatized lithospheric mantle source mixed with minor(3-5%)subduction-derived materials,whereas the andesite and rhyolite could be fractional crystallization products of the basaltic magma.The Shaquanzi Formation volcanic rocks could have formed in an intracontinental back-arc basin setting,probably via the southward subduction of the Kangguer Ocean beneath the Middle Tianshan Massif.The Yamansu mineralization belt might have undergone a continental arc to back-arc basin transition during the Late Carboniferous and the intra-continental back-arc basin might have closed in the Early Permian,marked by the emplacement of dioritic magma in the Shaquanzi belt.展开更多
In the era of large-scale retirement of power batteries,there are information barriers and high recovery costs in their recycling.In view of this,in this study we constructed a tripartite evolutionary game model of th...In the era of large-scale retirement of power batteries,there are information barriers and high recovery costs in their recycling.In view of this,in this study we constructed a tripartite evolutionary game model of the cooperation between power battery production and recycling enterprises and government participation.We analyzed the strategic choice of the three parties in the process of power battery recycling and simulated the influence of participants'willingness and information barriers on the strategic choices of the parties.The results showed that power battery production and recycling enterprises,and the government are affected by each other's willingness to participate at different degrees.The willingness of power battery manufacturers and recycling enterprises to cooperate with each other decreased with increases in information barriers.By analyzing the impact of information barrier on power battery recycling,some suggestions are put forward to provide decision-making reference for promoting the sustainable development of power battery industry.展开更多
Systematically sorting out the evolving pattern of solid waste management policies and studying the key points and development trends of solid waste management policies are conducive to the clarification of improvemen...Systematically sorting out the evolving pattern of solid waste management policies and studying the key points and development trends of solid waste management policies are conducive to the clarification of improvement path of solid waste management policies.Based on the promulgated solid waste management policies,this study applies statistical methods to the analysis of the text structure and contents of the solid waste management policies,attempting to find out the internal evolving pattern of the solid waste management policies in China.Closely integrating the current policy requirements for the construction of‘waste-free city’,this study puts forward a policy optimization and improvement path.The findings are briefly listed blow:①The solid waste management policies have demonstrated multiple text types and various levels of effectiveness,and the policy framework system is gradually optimized.②In each edition of solid waste management policy,the hotspot issues are highlighted with distinctive characteristics of the times and dynamic evolution.The policies are covering more fields,the contents are more targeted and comprehensive,and the implementation is more specific and practical.③The policies mainly focus on harmlessness,reduction,reclamation,pollution prevention,supervision and management,secondary pollution,recycling,circular economy,etc.④The government strengthens the top-level design from the macro level,focusing on policy guidance and standardization,policy coordination,technical support,and governance improvement to promote the realization of the goals of‘harmlessness,reduction,reclamation’.⑤The diversification of tools,approaches and factors supporting solid waste management,and the growing awareness of the technical support of solid waste management,and the management mode and governance path have entered the phase of adaptive transformation.Based on practical needs,the market oriented policies and incentive mechanisms for solid waste management are inadequate,applicable technical attention is not highly paid,and the comprehensive management level and governance capabilities are in urgent need of improvement.Combined with the theoretical research,practical actions and policy initiatives of the construction of‘waste-free city’in other countries,from the perspectives of solid waste full product lifecycle management,technical support paradigm policy,main body coordination policy,guidance incentive policy,laws and regulations and other aspects,the policy improvement path and direction of China’s‘waste-free city’are thoroughly discussed in this study.展开更多
基金financially supported by the Chinese National Basic Research 973-Program(No.2014CB440802)Project No.IS-2353 of GIGCAS
文摘The Yamansu belt,an important tectonic component of Eastern Tianshan Mountains,of the Central Asian Orogenic Belt,NW China hosts many Fe-(Cu)deposit.In this study,we present new zircon U-Pb geochronology and geochemical data of the volcanic rocks of Shaquanzi Formation and diorite intrusions in the Yamansu belt.The Shaquanzi Formation comprises mainly basalt,andesite/andesitic tuff,rhyolite and sub-volcanic diabase with local diorite intrusions.The volcanic rocks and diorites contain ca.315-305 Ma and ca.298 Ma zircons respectively.These rocks show calc-alkaline affinity with enrichment in large-ion lithophile elements(LILEs),light rare-earth elements(LREEs),and depletion in high field strength elements(HFSEs)in primitive mantle normalized multi-element diagrams,which resemble typical back-arc basin rocks.They show depleted mantle signature with ε_(Nd)(t)ranging from+3.1 to +5.6 for basalt;+2.1 to+4.7 for andesite;-0.2 to+1.5 for rhyolite and the ε_(Hf)(t)ranges from-0.1 to +13.0 for andesites;+5.8 to +10.7 for andesitic tuffs.We suggest that the Shaquanzi Formation basalt might have originated from a depleted,metasomatized lithospheric mantle source mixed with minor(3-5%)subduction-derived materials,whereas the andesite and rhyolite could be fractional crystallization products of the basaltic magma.The Shaquanzi Formation volcanic rocks could have formed in an intracontinental back-arc basin setting,probably via the southward subduction of the Kangguer Ocean beneath the Middle Tianshan Massif.The Yamansu mineralization belt might have undergone a continental arc to back-arc basin transition during the Late Carboniferous and the intra-continental back-arc basin might have closed in the Early Permian,marked by the emplacement of dioritic magma in the Shaquanzi belt.
基金supported by the science and technology research project of Chongqing Education Commission“Research on the renewable effect of China's renewable resources industry in the relationship between economic growth and environmental pollution”[Grant No.KJQN202000532]the humanities and Social Sciences Planning Project of Chongqing Education Commission“Research on supporting policies of power battery producer responsibility extension system un‐der the new development pattern of double cycle”[Grant No.21SKGH039].
文摘In the era of large-scale retirement of power batteries,there are information barriers and high recovery costs in their recycling.In view of this,in this study we constructed a tripartite evolutionary game model of the cooperation between power battery production and recycling enterprises and government participation.We analyzed the strategic choice of the three parties in the process of power battery recycling and simulated the influence of participants'willingness and information barriers on the strategic choices of the parties.The results showed that power battery production and recycling enterprises,and the government are affected by each other's willingness to participate at different degrees.The willingness of power battery manufacturers and recycling enterprises to cooperate with each other decreased with increases in information barriers.By analyzing the impact of information barrier on power battery recycling,some suggestions are put forward to provide decision-making reference for promoting the sustainable development of power battery industry.
文摘Systematically sorting out the evolving pattern of solid waste management policies and studying the key points and development trends of solid waste management policies are conducive to the clarification of improvement path of solid waste management policies.Based on the promulgated solid waste management policies,this study applies statistical methods to the analysis of the text structure and contents of the solid waste management policies,attempting to find out the internal evolving pattern of the solid waste management policies in China.Closely integrating the current policy requirements for the construction of‘waste-free city’,this study puts forward a policy optimization and improvement path.The findings are briefly listed blow:①The solid waste management policies have demonstrated multiple text types and various levels of effectiveness,and the policy framework system is gradually optimized.②In each edition of solid waste management policy,the hotspot issues are highlighted with distinctive characteristics of the times and dynamic evolution.The policies are covering more fields,the contents are more targeted and comprehensive,and the implementation is more specific and practical.③The policies mainly focus on harmlessness,reduction,reclamation,pollution prevention,supervision and management,secondary pollution,recycling,circular economy,etc.④The government strengthens the top-level design from the macro level,focusing on policy guidance and standardization,policy coordination,technical support,and governance improvement to promote the realization of the goals of‘harmlessness,reduction,reclamation’.⑤The diversification of tools,approaches and factors supporting solid waste management,and the growing awareness of the technical support of solid waste management,and the management mode and governance path have entered the phase of adaptive transformation.Based on practical needs,the market oriented policies and incentive mechanisms for solid waste management are inadequate,applicable technical attention is not highly paid,and the comprehensive management level and governance capabilities are in urgent need of improvement.Combined with the theoretical research,practical actions and policy initiatives of the construction of‘waste-free city’in other countries,from the perspectives of solid waste full product lifecycle management,technical support paradigm policy,main body coordination policy,guidance incentive policy,laws and regulations and other aspects,the policy improvement path and direction of China’s‘waste-free city’are thoroughly discussed in this study.
