The Gaojiacun mafic-uitramafic intrusivecomplex in the Yanbian area, Sichuan Province, is a strati-form intrusive body that has undergone intensive magmaticdifferentiation. This intrusive body involves two magmaticacc...The Gaojiacun mafic-uitramafic intrusivecomplex in the Yanbian area, Sichuan Province, is a strati-form intrusive body that has undergone intensive magmaticdifferentiation. This intrusive body involves two magmaticaccumulating cycles. Systematic U-Pb dating of single zircongrains and ^40Ar/^39Ar dating of hornblende were conducted,and the results showed that the age of hornblende gabbro,which was formed at the main phase of intrusion of the Gao-jiacun intrusive complex, is 840±5 Ma, casting doubt on theconcept of 'Yanbian Ophiolite'. It is believed that the for-mation of the Gaojiacun intrusive complex seems to be re-lated to a super-mantle plume underneath the su-per-continent Rodinia. The above research results are helpfulfor us to get a better understanding of the characteristics ofNeoproterozoic tectonic evolution of the Yanbian area inSichuan Province.展开更多
A new method based on mass fluxes and observed ozone profiles was developed to estimate crosstropopause ozone flux. Using this method, we estimated the cross-tropopause ozone flux in a stratospheric-tropospheric excha...A new method based on mass fluxes and observed ozone profiles was developed to estimate crosstropopause ozone flux. Using this method, we estimated the cross-tropopause ozone flux in a stratospheric-tropospheric exchange event that occurred over East Asia in March 2001.The result revealed that the ozone flux across the tropopause in this event was an order of magnitude higher than the global and hemispheric average. Compared to the traditional method using a linear relationship between ozone mixing ratio and potential vorticity near the tropopause, the cross-tropopause ozone flux evaluated with ozonesonde data was somewhat higher, although the orders of the two values were the same.展开更多
文摘The Gaojiacun mafic-uitramafic intrusivecomplex in the Yanbian area, Sichuan Province, is a strati-form intrusive body that has undergone intensive magmaticdifferentiation. This intrusive body involves two magmaticaccumulating cycles. Systematic U-Pb dating of single zircongrains and ^40Ar/^39Ar dating of hornblende were conducted,and the results showed that the age of hornblende gabbro,which was formed at the main phase of intrusion of the Gao-jiacun intrusive complex, is 840±5 Ma, casting doubt on theconcept of 'Yanbian Ophiolite'. It is believed that the for-mation of the Gaojiacun intrusive complex seems to be re-lated to a super-mantle plume underneath the su-per-continent Rodinia. The above research results are helpfulfor us to get a better understanding of the characteristics ofNeoproterozoic tectonic evolution of the Yanbian area inSichuan Province.
文摘A new method based on mass fluxes and observed ozone profiles was developed to estimate crosstropopause ozone flux. Using this method, we estimated the cross-tropopause ozone flux in a stratospheric-tropospheric exchange event that occurred over East Asia in March 2001.The result revealed that the ozone flux across the tropopause in this event was an order of magnitude higher than the global and hemispheric average. Compared to the traditional method using a linear relationship between ozone mixing ratio and potential vorticity near the tropopause, the cross-tropopause ozone flux evaluated with ozonesonde data was somewhat higher, although the orders of the two values were the same.
