独居石[（LREE，Th）PO4]分布广泛，是一种中酸性岩浆岩和变质岩中较常见的副矿物，在一些沉积岩中也存在。通常具有较高的Th、U含量和较低的普通铅组成，封闭温度高，在形成后的封闭体系中U／Th／Pb比值基本不受后期地质作用影响，是U...独居石[（LREE，Th）PO4]分布广泛，是一种中酸性岩浆岩和变质岩中较常见的副矿物，在一些沉积岩中也存在。通常具有较高的Th、U含量和较低的普通铅组成，封闭温度高，在形成后的封闭体系中U／Th／Pb比值基本不受后期地质作用影响，是U-Pb测年的理想对象（Parrish，1990：Paquette and Tiepolo，2007）。展开更多
Ar-Ar total fusion and step heating methods have been used to determination the isotopic ages of the volcanic rocks from George King Island ,west Antarctica .Argon isotopes of the seven volcanic rock samples are measu...Ar-Ar total fusion and step heating methods have been used to determination the isotopic ages of the volcanic rocks from George King Island ,west Antarctica .Argon isotopes of the seven volcanic rock samples are measured in the modified RGA10mass spectrometer, operated in static mode .Some useful Ar-Ar plateau ages , isochrone ages and the initial 40Ar/36Ar ratios of these samples are given and their geological implications are discussed in this paper .展开更多
Sm-Nd dating on three eclogite bodies from Tiqiushan, Xinyi in the northern Jiansu yield the following new age results: 212, 217and 222Ma, respectively. The isochron age of three eclogites and six minerals is 217(5Ma...Sm-Nd dating on three eclogite bodies from Tiqiushan, Xinyi in the northern Jiansu yield the following new age results: 212, 217and 222Ma, respectively. The isochron age of three eclogites and six minerals is 217(5Ma，MSWD=0.56, (Nd(T)=-2.9. The Sm-Nd age of 217 Ma is adopted as the formation of Tiqiushan eclogite body during ultrahigh pressure metamorphism. The petrogenesis of the eclogites shows a mantle origin with a small amount of lower crustal comtaimination. The evidences show that Su ad Lu blocks used to be a part of Qinling-Dabie fold zone. The collision period between the Sino-Korean and Yangtze blocks occurred in late Triassic.展开更多
文摘独居石[（LREE，Th）PO4]分布广泛，是一种中酸性岩浆岩和变质岩中较常见的副矿物，在一些沉积岩中也存在。通常具有较高的Th、U含量和较低的普通铅组成，封闭温度高，在形成后的封闭体系中U／Th／Pb比值基本不受后期地质作用影响，是U-Pb测年的理想对象（Parrish，1990：Paquette and Tiepolo，2007）。
文摘Ar-Ar total fusion and step heating methods have been used to determination the isotopic ages of the volcanic rocks from George King Island ,west Antarctica .Argon isotopes of the seven volcanic rock samples are measured in the modified RGA10mass spectrometer, operated in static mode .Some useful Ar-Ar plateau ages , isochrone ages and the initial 40Ar/36Ar ratios of these samples are given and their geological implications are discussed in this paper .
文摘Sm-Nd dating on three eclogite bodies from Tiqiushan, Xinyi in the northern Jiansu yield the following new age results: 212, 217and 222Ma, respectively. The isochron age of three eclogites and six minerals is 217(5Ma，MSWD=0.56, (Nd(T)=-2.9. The Sm-Nd age of 217 Ma is adopted as the formation of Tiqiushan eclogite body during ultrahigh pressure metamorphism. The petrogenesis of the eclogites shows a mantle origin with a small amount of lower crustal comtaimination. The evidences show that Su ad Lu blocks used to be a part of Qinling-Dabie fold zone. The collision period between the Sino-Korean and Yangtze blocks occurred in late Triassic.
