安徽中生代花岗岩铅同位素组成与铅同位素省划分

LEAD ISOTOPE COMPOSITIONS OF MESOZOIC GRANITOIDS AND LEAD ISOTOPIC PROVINCES FROM ANHUI PROVINCE

根据安徽省境内71个中生代花岗岩类岩石长石铅同位素组成特征模式,可将安徽省基底划分成六个铅同位素省,即大别省、北淮阳-阜蚌省、鲁皖省、北扬子省、南大别省、南扬子省和天长(洪泽湖)-太湖省等。不同省中生代长石铅同位素组成主要受基底岩石组成和形成时代及其区域变质程度所制约。

According to 71 Pb isotopic data of Mesozoic granitoids and their lead isotope characteristic pattern from different aeras in Anhui, the authors divide Anhui into 6 Pb isotopic provinces: Dabieshan province (A), North Huaiyang-Fubu province (B), North Anhui province(G), North Yangtze province (C), South Yangtze province (D) and Tianchang-Tai lake province (F). The authors also suggest that the lead isotope characteristic pattern of Mesozoic granitoids from each lead isotopic province is closely related to the chemical composition, the age, and the regional metamorphism grade of basement rocks