Rb-Sr chronology and cooling history of the Renjiawan pyroxenite intrusionin north Dabie terrane

A group of Rb-Sr ages, i.e. plagioclase-whole rock (WR) isochron age of (20 5 +/- 7) Ma, hornblende-WR isochron age of (164 +/- 10) Ma and biotite-WR i sochron age of (123.4 +/- 1.2) Ma, for one pyroxenite sample from Renjiawan in North Dabie Terrane (NDT) are reported. According to the closure temper ature of 600 degrees C for plageoclase and 300 degrees C for biotite, the R enjiawan pyroxenite should intrude into the NDT before 205 Ma, and the youn ger Rb-Sr ages may reflect the cooling history of the Intrusion or reset by the very strong Cretaceous thermal event in NDT.