A group of Rb-Sr ages, i.e. plagioclase-whole rock (WR) isochron age of (205±7) Ma,hornblende-WR isochron age of (164±10) Ma and biotite-WR isochron age of (123.4±1.2)Ma, for one pyroxenite sample from ...A group of Rb-Sr ages, i.e. plagioclase-whole rock (WR) isochron age of (205±7) Ma,hornblende-WR isochron age of (164±10) Ma and biotite-WR isochron age of (123.4±1.2)Ma, for one pyroxenite sample from Renjiawan in North Dabie Terrane (NDT) are reported. According to the closure temperature of 600℃ for plageoclase and 300℃ for biotite, the Renjiawan pyroxenite should intrude into the NDT before 205 Ma, and the younger Rb-Sr ages may reflect the cooling history of the intrusion or reset by the very strong Cretaceous thermal event in NDT.展开更多
A Sm_Nd age of (228±42) Ma with initial ε Nd =-16.4 for the Renjiawan pyroxenite intrusion in the North Dabie terrane is reported. This age with another Sm_Nd age of (230±44) Ma for the Zhujiapu pyroxenite ...A Sm_Nd age of (228±42) Ma with initial ε Nd =-16.4 for the Renjiawan pyroxenite intrusion in the North Dabie terrane is reported. This age with another Sm_Nd age of (230±44) Ma for the Zhujiapu pyroxenite in the same terrane documents that the pyroxenite in the North Dabie terrane are formed during continental subduction time of the Yangtze craton in the Triassic.展开更多
文摘A group of Rb-Sr ages, i.e. plagioclase-whole rock (WR) isochron age of (205±7) Ma,hornblende-WR isochron age of (164±10) Ma and biotite-WR isochron age of (123.4±1.2)Ma, for one pyroxenite sample from Renjiawan in North Dabie Terrane (NDT) are reported. According to the closure temperature of 600℃ for plageoclase and 300℃ for biotite, the Renjiawan pyroxenite should intrude into the NDT before 205 Ma, and the younger Rb-Sr ages may reflect the cooling history of the intrusion or reset by the very strong Cretaceous thermal event in NDT.
文摘A Sm_Nd age of (228±42) Ma with initial ε Nd =-16.4 for the Renjiawan pyroxenite intrusion in the North Dabie terrane is reported. This age with another Sm_Nd age of (230±44) Ma for the Zhujiapu pyroxenite in the same terrane documents that the pyroxenite in the North Dabie terrane are formed during continental subduction time of the Yangtze craton in the Triassic.
