Eocene felsic porphyric rocks and the high-Mg potassic volcanic rocks（HMPR） occur along the Jinshajiang-Ailao Shan-Red River shear zone（JARSZ） in eastern Tibet.Compared with the HMPR,which are generally believed t...Eocene felsic porphyric rocks and the high-Mg potassic volcanic rocks（HMPR） occur along the Jinshajiang-Ailao Shan-Red River shear zone（JARSZ） in eastern Tibet.Compared with the HMPR,which are generally believed to be sourced from an enriched mantle,the felsic porphyric rocks show similar K_2O contents,enrichment in LREE and LILE,particularly radiogenic isotope（e.g.Sr and Nd） features much similar to the former,implying generation of the felsic porphyric rocks most likely related to the HMPR,although they both have clearly different major and trace element compositions. The close relationship in spatial-temporal distribution and similar Sr-Nd characteristics between the felsic porphyric rocks and HMPR in eastern Tibet indicate that both of them were possibly formed by a similar tectonic process（event）.Combining the basic dikes in southern and eastern Tibet,we suggest that the break-off of north-dipping Neo-Tethyan slab in southern Tibet during 50-40 Ma,triggered formation of high-Mg potassic magma.This led to developing felsic porphyric magma production by partial melting of underplating HMPR in the lower crust,or fractionation crystallization of the high-Mg potassic magmas.The break-off of slab in the Eocene may also have contributed to the abundant ore-forming material related to earlier subduction events,resulting in formation of the porphyric deposits along JARSZ in eastern Tibet.展开更多
6,6"-Terpyridylene bridged cyclic porphyrin dimer 2Ni,trimer 3Ni,tetramer 4Ni and pentamer 5Ni were obtained through Suzuki-Miyaura coupling reaction of/~,jB'-diboryl Ni(II)porphyrin with 6,6"-dibromo-2,...6,6"-Terpyridylene bridged cyclic porphyrin dimer 2Ni,trimer 3Ni,tetramer 4Ni and pentamer 5Ni were obtained through Suzuki-Miyaura coupling reaction of/~,jB'-diboryl Ni(II)porphyrin with 6,6"-dibromo-2,2':6',2"-terpyridine.Free base porphyrin nanorings 2H-SH were obtained by demetallation of 2Ni-SNi with sulfuric acid in CHCl_(3)and then were converted into 2Zn-SZn upon treatment with Zn(OAc)2 in quantitative yields,respectively.All of these newly synthesized porphyrin nanorings were characterized by high-resolution mass spectrometry and 1H NMR spectroscopy.The photophysical properties of porphyrin nanoring were examined by UV-vis and fluorescence spectra.The electrochemical properties of 2Ni-SNi were investigated by cyclic voltammetry and differential pulse voltammetry.The UV-vis absorption spectra and fluorescence spectra of these cyclic porphyrin arrays indicate that there exist unique electronic interactions between the constituent porphyrin units in each ring.Electrochemical analysis shows that the trimer 3Ni exhibit different redox behavior,which indicate that the porphyrin units in 3Ni are presumably more coplanar than in other cyclic oorohvrin arrays.展开更多
基金supported by the following projects: National Basic Research Program of China (2009CB421004)Natural Science Foundation of China (40872055,40930316,41073033,and 41003018)+2 种基金Chinese Academy of Sciences(KZCX2-YW-Q04)China Geological Survey(1212010818098)Guangzhou Institute of Geochemistry Chinese Academy of Sciences (GIGCAS)(IS-1247)
文摘Eocene felsic porphyric rocks and the high-Mg potassic volcanic rocks（HMPR） occur along the Jinshajiang-Ailao Shan-Red River shear zone（JARSZ） in eastern Tibet.Compared with the HMPR,which are generally believed to be sourced from an enriched mantle,the felsic porphyric rocks show similar K_2O contents,enrichment in LREE and LILE,particularly radiogenic isotope（e.g.Sr and Nd） features much similar to the former,implying generation of the felsic porphyric rocks most likely related to the HMPR,although they both have clearly different major and trace element compositions. The close relationship in spatial-temporal distribution and similar Sr-Nd characteristics between the felsic porphyric rocks and HMPR in eastern Tibet indicate that both of them were possibly formed by a similar tectonic process（event）.Combining the basic dikes in southern and eastern Tibet,we suggest that the break-off of north-dipping Neo-Tethyan slab in southern Tibet during 50-40 Ma,triggered formation of high-Mg potassic magma.This led to developing felsic porphyric magma production by partial melting of underplating HMPR in the lower crust,or fractionation crystallization of the high-Mg potassic magmas.The break-off of slab in the Eocene may also have contributed to the abundant ore-forming material related to earlier subduction events,resulting in formation of the porphyric deposits along JARSZ in eastern Tibet.
基金supported by the National Natural Science Foundation of China(No.21272065)the Opening Fund of Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research(Ministry of Education of China),Hunan Normal University(No.KLCBTCMR2015-07)+2 种基金the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education MinistryScientific Research Fund of Hunan Provincial Education Department(No.16A125)the National Natural Science Foundation of China(No.21602058)
文摘6,6"-Terpyridylene bridged cyclic porphyrin dimer 2Ni,trimer 3Ni,tetramer 4Ni and pentamer 5Ni were obtained through Suzuki-Miyaura coupling reaction of/~,jB'-diboryl Ni(II)porphyrin with 6,6"-dibromo-2,2':6',2"-terpyridine.Free base porphyrin nanorings 2H-SH were obtained by demetallation of 2Ni-SNi with sulfuric acid in CHCl_(3)and then were converted into 2Zn-SZn upon treatment with Zn(OAc)2 in quantitative yields,respectively.All of these newly synthesized porphyrin nanorings were characterized by high-resolution mass spectrometry and 1H NMR spectroscopy.The photophysical properties of porphyrin nanoring were examined by UV-vis and fluorescence spectra.The electrochemical properties of 2Ni-SNi were investigated by cyclic voltammetry and differential pulse voltammetry.The UV-vis absorption spectra and fluorescence spectra of these cyclic porphyrin arrays indicate that there exist unique electronic interactions between the constituent porphyrin units in each ring.Electrochemical analysis shows that the trimer 3Ni exhibit different redox behavior,which indicate that the porphyrin units in 3Ni are presumably more coplanar than in other cyclic oorohvrin arrays.
