Objective The No.X03 lithium pegmatite vein in the Jiajika lithium deposit in western Sichuan is a newly discovered super-large vein which contains an identified reserves of643,100 tons Li2O.Lithium has two stable iso...Objective The No.X03 lithium pegmatite vein in the Jiajika lithium deposit in western Sichuan is a newly discovered super-large vein which contains an identified reserves of643,100 tons Li2O.Lithium has two stable isotopes(~6Li and^7Li),and^6Li is a key raw material for nuclear fusion.Significant fractionation of lithium isotopes is almost nonexistent during partial melting。展开更多
The Madi rare metal granite is a complex massif,which contains a variety of rare metals,such as Nb,Ta,Li,and Be.In this paper,the geochemical characteristics of the granite were obtained by multi-collector inductively...The Madi rare metal granite is a complex massif,which contains a variety of rare metals,such as Nb,Ta,Li,and Be.In this paper,the geochemical characteristics of the granite were obtained by multi-collector inductively coupled mass spectrometry(MC-ICP-MS).The precise crystalline age of the granite was obtained from monazite U-Pb dating,and the source of the granite was determined using Li-Nd isotopes.The Madi rare metal granite is a high-K(calc-alkaline),peraluminous,S-type granite.The U-Pb monazite age indicates that the crystalline age of the granite is 175.6 Ma,which is Early Jurassic.The granite is characterized by a relatively wide range ofδ7 Li values(+2.99‰to+5.83‰)and high lithium concentrations(181 ppm to 1022 ppm).The lithium isotopic composition of the granite does not significantly correlate with the degree of magmatic differentiation.An insignificant amount of lithium isotope fractionation occurred during the granitic differentiation.The lithium isotopic composition of the granite significantly differs from that of the wall rock,but it is very similar to that of a primitive mantle peridotite xenolith(meanδ7 Li value+3.5‰).The plot of Li concentration versusδ7 Li indicates that the Li isotopic composition of the granite is similar to that of island arc lavas.Based on the above-described evidence,the granite was mainly derived from the crust,but it was contaminated by a deep granitic magma.展开更多
Acellular porcine small intestinal submucosa(SIS)has been used for esophagoplasty with success in a canine model.However,it did not lead to complete epithelialization.For better reconstruction,a cellular component is ...Acellular porcine small intestinal submucosa(SIS)has been used for esophagoplasty with success in a canine model.However,it did not lead to complete epithelialization.For better reconstruction,a cellular component is required.Moreover,promotion of angiogenesis with copper has been widely recognized by basic research as well as clinical studies.In this study,we have evaluated the feasibility and effectiveness of combined Cu and SIS(SIS-Cu patch)for the esophageal repair using a canine model.Eighteen male beagle dogs were subjected to surgical resection to produce cervical esophageal defects(5 cm in length,180°in range).SIS with Cu(5 or 25μmol L 1copper)or without Cu was patched on the esophageal defects.Barium esophagram and histology exam were carried out to evaluate the effectiveness of the therapy.As shown,the SIS-Cu graft promoted re-epithelialization,re-vascularization and muscular regeneration.SIS-Cu patch is more effective than SIS alone for esophageal repair,and the SIS+25μmol L 1Cu group demonstrated additional advantages over the SIS+5μmol L 1Cu.展开更多
基金financially supported by the National Key Research and Development Program of China (grant No. 2017YFC0602701)the “Geology of Mineral Resources in China” from the China Geological Survey (grants No. DD20160346, DD20190379)
文摘Objective The No.X03 lithium pegmatite vein in the Jiajika lithium deposit in western Sichuan is a newly discovered super-large vein which contains an identified reserves of643,100 tons Li2O.Lithium has two stable isotopes(~6Li and^7Li),and^6Li is a key raw material for nuclear fusion.Significant fractionation of lithium isotopes is almost nonexistent during partial melting。
基金the project of“Comprehensive integration and service of mineral geology and its metallogenic regularity in China”from China Geological Survey(Grant No.DD20160346)
文摘The Madi rare metal granite is a complex massif,which contains a variety of rare metals,such as Nb,Ta,Li,and Be.In this paper,the geochemical characteristics of the granite were obtained by multi-collector inductively coupled mass spectrometry(MC-ICP-MS).The precise crystalline age of the granite was obtained from monazite U-Pb dating,and the source of the granite was determined using Li-Nd isotopes.The Madi rare metal granite is a high-K(calc-alkaline),peraluminous,S-type granite.The U-Pb monazite age indicates that the crystalline age of the granite is 175.6 Ma,which is Early Jurassic.The granite is characterized by a relatively wide range ofδ7 Li values(+2.99‰to+5.83‰)and high lithium concentrations(181 ppm to 1022 ppm).The lithium isotopic composition of the granite does not significantly correlate with the degree of magmatic differentiation.An insignificant amount of lithium isotope fractionation occurred during the granitic differentiation.The lithium isotopic composition of the granite significantly differs from that of the wall rock,but it is very similar to that of a primitive mantle peridotite xenolith(meanδ7 Li value+3.5‰).The plot of Li concentration versusδ7 Li indicates that the Li isotopic composition of the granite is similar to that of island arc lavas.Based on the above-described evidence,the granite was mainly derived from the crust,but it was contaminated by a deep granitic magma.
基金supported by the National Natural Science Foundation of China(31271058 and 81100327)the National High Technology Research and Development Program of China(2012AA020503)
文摘Acellular porcine small intestinal submucosa(SIS)has been used for esophagoplasty with success in a canine model.However,it did not lead to complete epithelialization.For better reconstruction,a cellular component is required.Moreover,promotion of angiogenesis with copper has been widely recognized by basic research as well as clinical studies.In this study,we have evaluated the feasibility and effectiveness of combined Cu and SIS(SIS-Cu patch)for the esophageal repair using a canine model.Eighteen male beagle dogs were subjected to surgical resection to produce cervical esophageal defects(5 cm in length,180°in range).SIS with Cu(5 or 25μmol L 1copper)or without Cu was patched on the esophageal defects.Barium esophagram and histology exam were carried out to evaluate the effectiveness of the therapy.As shown,the SIS-Cu graft promoted re-epithelialization,re-vascularization and muscular regeneration.SIS-Cu patch is more effective than SIS alone for esophageal repair,and the SIS+25μmol L 1Cu group demonstrated additional advantages over the SIS+5μmol L 1Cu.
