Orientale Basin is the youngest multi-ring basin on the moon. Previously, there are a lot of researches about formation theories of Orientale Basin, but most of them are based on the vertical impact formation mechanisms However, some scholars provide the image that Orientale Basin is an oblique impact, but there are no detail parameters. By comprehensively analyzing the LRO WAC image data, LOLA, M-3 and IIM, we interpret the topographic feature and material compositions of the Orientale Basin. Then combining the formation theory of impact craters, we suggest that it has a central uplift ridge (central uplift line) in the melt zone, which divides the center into the smooth and rough parts. It is perpendicular to the impact trajectory of Orientale Basin and caused by the shock wave putting during the impact process. Then using the GRAIL data, we discuss the reasons of the region gravity anomalies of Oriental Basin, proposing it is the result of local Moho uplifting and the formation of the impact melt, which is caused by the change of pressure, temperature and viscosity of the rock. We got the volume of the melt, which is about 1.1 x 10(6)km(3) and 25% of the basin materials. Finally we merge the multi-source data together, mapping an Oriental Basin ejecta units map. Basing on the structures of ejecta units, the line structure, secondary craters, the central uplift line and formation theories of oblique impact, we propose that Orientale Basin is formed by a 50 similar to 100km diameter impactor oblique impacting the lunar at the velocity of 10 similar to 30km/s, with 20 degrees to 30 degrees impact horizontal sextant angle and east to northeast about 20 similar to 30 degrees NE-SW direction. This work can provide theoretical reference for the study more early lunar craters. 

Publication name	ACTA PETROLOGICA SINICA, 32 (1):135-143; JAN 2016
Author(s)	Liu JingWen; Liu JianZhong; Guo DiJun; Ji JinZhu; Wang QingLong; Li ShiJie
Corresponding author	LIU Jianzhong   liujz@nao.cas.cn  Chinese Acad Sci, Inst Geochem, Lunar & Planetary Sci Res Ctr, Guiyang 550081, Peoples R China.

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