Reflection from the Mantle: A Deep Seismic Reflection Profile from Songliao Basin to Hulin Basin in Northeast China

Sino-Probe project designed a deep seismic reflection profile from Songliao Basin to Hulin Basin in Northeast China, in order to explore deep structures and understand the relationship between the Pacific plate and the China Mainland plate. The length of the whole section was cumulated to 596.25km, crossing 3 big basins, 5 major ruptures, 2 uplifts and the Wanda Mountain. The crust to mantle along the profile is very complex, while the ground surface showed various terrains, of which 40% is plain area, 35% is mountainous area and 25% is river area. Two kinds of observation system were designed according to the special geological condition, i.e., excitation in the middle with recordings at 2 sides, and excitation at one end with unidirectional recordings, with 3 doses of explosive, i.e. 20kg, 100kg and 500kg per hole(Table-1). Data from the profiling provided information for deep process of the formation and evolution of petroliferous basins in China, the underground changes in structure impressed by Tancheng-Lujiang rupture, the reflection from MOHO with period of 8.9-11.3 seconds and the reflection from upper mantle cap rocks and inner mantle with period over 13 seconds. Comprehensive analysis on the obtained data at the section would help us understand more about the distribution of minerals, the contacting features between the Pacific plate and the China Mainland plate, and the structure evolution in mantle. Key Words: Deep seismic reflection, MOHO reflection, Tancheng-Lujiang rupture, upper mantle cap rocks, mantle reflectorsdata acquisition parameters