Using the in situ zircon U-Pb dating method of LA-ICPMS, we analyzed the 31 Ma old SHRIMP U-Pb age of the Yongsheng nepheline syenite from southern Jilin Province under different spot sizes. The obtained ages are comp...Using the in situ zircon U-Pb dating method of LA-ICPMS, we analyzed the 31 Ma old SHRIMP U-Pb age of the Yongsheng nepheline syenite from southern Jilin Province under different spot sizes. The obtained ages are comparable with that of SHRIMP in both accuracy and precision. The age is also identical to that of the Yinmawanshan gabbro from the Liaodong Peninsula within error. Both the Yongsheng nepheline syenite and the Yinmawanshan gabbro represent the youngest known exposed intrusions in northeastern and even eastern China. The results indicate the Eocene mantle-derived magmatic underplating, and the rapid crustal uplifting of this region since 30 Ma. The analyses also document extremely high LREE concentrations and relatively flat REE patterns for the zircons from the Yongsheng nepheline syenite, which represent a new type of zircon REE pattern.展开更多
对杭州市郊4个主要蔬菜基地的土壤中的重金属铅、锌、铜含量进行测定分析,利用不同的评价方法和标准来评价杭州市郊蔬菜地土壤重金属的环境质量状况。结果发现如以自然背景值为评价标准,则蔬菜基地土壤中的重金属超过污染指标,污染程度...对杭州市郊4个主要蔬菜基地的土壤中的重金属铅、锌、铜含量进行测定分析,利用不同的评价方法和标准来评价杭州市郊蔬菜地土壤重金属的环境质量状况。结果发现如以自然背景值为评价标准,则蔬菜基地土壤中的重金属超过污染指标,污染程度为Pb > Cu > Zn;如以国家《土壤重金属污染评价标准》为评价标准,则蔬菜基地土壤中的重金属未超过污染指标,污染程度为Zn > Cu > Pb;在4个调查区中,拱墅区土壤重金属大于其它3个区。展开更多
基金co-supported by the National Natural Science Foundation of China(Grant Nos.40133020 and 40272045)the Chinese Ministry of Science and Technology of China(Grant No.G1999043202)the Chinese Academy of Sciences and the Key Laboratory of Continental Dynamics,Northwest University,the Ministry of Education of China.
文摘Using the in situ zircon U-Pb dating method of LA-ICPMS, we analyzed the 31 Ma old SHRIMP U-Pb age of the Yongsheng nepheline syenite from southern Jilin Province under different spot sizes. The obtained ages are comparable with that of SHRIMP in both accuracy and precision. The age is also identical to that of the Yinmawanshan gabbro from the Liaodong Peninsula within error. Both the Yongsheng nepheline syenite and the Yinmawanshan gabbro represent the youngest known exposed intrusions in northeastern and even eastern China. The results indicate the Eocene mantle-derived magmatic underplating, and the rapid crustal uplifting of this region since 30 Ma. The analyses also document extremely high LREE concentrations and relatively flat REE patterns for the zircons from the Yongsheng nepheline syenite, which represent a new type of zircon REE pattern.
文摘对杭州市郊4个主要蔬菜基地的土壤中的重金属铅、锌、铜含量进行测定分析,利用不同的评价方法和标准来评价杭州市郊蔬菜地土壤重金属的环境质量状况。结果发现如以自然背景值为评价标准,则蔬菜基地土壤中的重金属超过污染指标,污染程度为Pb > Cu > Zn;如以国家《土壤重金属污染评价标准》为评价标准,则蔬菜基地土壤中的重金属未超过污染指标,污染程度为Zn > Cu > Pb;在4个调查区中,拱墅区土壤重金属大于其它3个区。
