Bengbu uplift located at the south of north craton and existed in south part of Jiao-Liao-Ji orogenic zone, it consist of Fengyang unit and Wuhe unit. Previous studies of Wuhe diamictite mainly direct to chronology and geochemistry, so it metamorphism P-T conditions and stratum profile has rarely attention. The contribution try to build Zhuding-Shimenshan lithosphere profile base on the study of metamorphic petrology, tectonic geology and zircon U-Pb chronology. Conducted large amount of P-T condition calculation we had been confirmed the ambit and the difference among Zhuding unit, Zhungzili unit and Shimenshan unit. The results of Zhuding unit is LGR and its P-T conditions are as follows: T = 720 ℃～840 ℃， P = 0.90～1.33 GPa. Zhuangzili unit’s results similar to former: T = 700 ℃～ 820 ℃，P = 0.50～0.90 GPa. The last unit limited by the lithology we just did the P-T conditions calculation with Ti-in-muscovite geothermometer, and the data shows it might be AM facies: T = 610 ℃～700 ℃， P = 0.30～0.50 GPa. Furthermore, we had attained the zircon U-Pb average age of ZK1013H19 is 2 413± 22 Ma, and it in accord with predecessors studies. Moreover, because of the zircon U-Pb of Mopanshan and Nvshan plutons are later than 2.5～2.4 Ga, they are intrusive rock, so we should take it into consideration when we calculated. And, the attitude of stratum is between 45° and 60°, using two of the extreme stratum to calculate, the thickness of lithosphere is about 16 km. And, taking account of three mylonite belts, we reckon Zhuding-Shimenshan belts belong to mid-upper crust. Summarized the P-T conditions, tectonic geology and zircon U-Pb chronology, the paper built the thinlithosphere profile preliminary. All the results suggest that from south to north are Zhuding unit, Zhuangzili unit and Shimenshan unit, the ambit is Baishishan and Shimoshan pluton respectively. And the P-T conditions show an increasing trend from south to north in Zhuding-Shimenshan belt.
Wang Juan Shi Yonghong Song Chuanzhong Cao Sheng Liu Qi Pang Xiaoke. The studying of P-T structure and geochronology for Wuhe complex rocks from North Anhui[J]. Chinese Journal of Geology, 2017, 52(2): 487-505.