The early Paleozoic (Pan African) thermal event of the Larsemann Hills and its adjacent areas, East Antarctica is discussed based upon the isotope ages we obtained. An Sm-Nd internal isochron for a representative mafi...The early Paleozoic (Pan African) thermal event of the Larsemann Hills and its adjacent areas, East Antarctica is discussed based upon the isotope ages we obtained. An Sm-Nd internal isochron for a representative mafic granulite yields an age of 540 Ma±75 Ma. Another Sm-Nd internal isochron, which is made up of the assemblage of the peak metamorphism and its whole rock as well, gives an age of 497 Ma ± 7 Ma The isotopic chronological data of single zircon stepwise evaporation dating and 40Ar-39Ar analysis provide further evidence for the early Paleozoic event of high-grade metamorphism in the region. The data from the field geological investigation in the Larsemann Hills also show that there is not only strong regional partial melting but also low-pressure granulite-facies metamorphism accompanied by it in the region. The early Paleozoic (Pan African) thermal event of the region may be related to the final formation of the East Antarctica craton, even of Gondwanaland.展开更多
From the autumn of 1981 to the winter of 1984, some geological investigations were conducted in Hunan, Jiangxi, Fujian, Guangxi and Guangdong in research on the tectonic problems of South China, and some new knowledge...From the autumn of 1981 to the winter of 1984, some geological investigations were conducted in Hunan, Jiangxi, Fujian, Guangxi and Guangdong in research on the tectonic problems of South China, and some new knowledge was acquired.This paper is a preliminary report and will be complemented later as various analyses and studies are now in progress at laboratory.展开更多
基金Project supported by the National Natural Science Foundation of China, Geological Science Foundation of China and State Antarctic Committee of China.
文摘The early Paleozoic (Pan African) thermal event of the Larsemann Hills and its adjacent areas, East Antarctica is discussed based upon the isotope ages we obtained. An Sm-Nd internal isochron for a representative mafic granulite yields an age of 540 Ma±75 Ma. Another Sm-Nd internal isochron, which is made up of the assemblage of the peak metamorphism and its whole rock as well, gives an age of 497 Ma ± 7 Ma The isotopic chronological data of single zircon stepwise evaporation dating and 40Ar-39Ar analysis provide further evidence for the early Paleozoic event of high-grade metamorphism in the region. The data from the field geological investigation in the Larsemann Hills also show that there is not only strong regional partial melting but also low-pressure granulite-facies metamorphism accompanied by it in the region. The early Paleozoic (Pan African) thermal event of the region may be related to the final formation of the East Antarctica craton, even of Gondwanaland.
文摘From the autumn of 1981 to the winter of 1984, some geological investigations were conducted in Hunan, Jiangxi, Fujian, Guangxi and Guangdong in research on the tectonic problems of South China, and some new knowledge was acquired.This paper is a preliminary report and will be complemented later as various analyses and studies are now in progress at laboratory.
