AGE AND SOURCE MATERIALS OF BAJIATAN AND FANSHAN-SHIMATAN INTRUSIVE ROCKS IN LUJIANG-ZONGYANG DISTRICT, ANHUI PROVINCE

The Mesozoic volcanic rocks in Lujiang-Zongyang district can be divided into four formations, from early to late, Longmenyuan, Zhuanqiao, Shuangmiao, Fushan. Their isotopic ages are in confusion. For example, the 11 dating data of Zhuanqiao Formation are between 135 Ma and 109 Ma, belonging to K1, whereas other 9 dating data are from 136 Ma to 178 Ma, belonging to J2—J3. Through the studies on Sm-Nd and Rb-Sr isotopic composition of the Bajiatan and Fanshan-Shimatan volcanic-intrusive rocks in the district, some significant data with regard to the ages and source materials of the volcanic-intrusive rocks have been acquired and published in this note.