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《Chinese Journal of Geophysics》 1986-03
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EXPLOSION SEISMOLOGICAL STUDY OF THE STRUCTURE OF THE CRUST AND UPPER MANTLE AT SOUTHERN PART OF THE PANXI TECTONIC BELT

XIONG SIIAO-BAI TENG JI-WBN YIN ZIIOU-XUNLAI MING-HUI HUANG YI-PING (Institute of Geophysics, Academia Sinica)  
The Institute of Geophysics, Academia Sinica conducted some experiments of seismic refraction profiling crossing the Panzhihua region in 1984. The Panzhihua region is located at the southern part of the Panxi tectonic belt. We have analyzed six record sections for the W-E profile which extends 350 km. The results are as follows: (1) The crust of the Panxi region can be divided into three main layers Avith thicknesses of about 20, 20, and 15km respectively. (2) The thickness and the average velocity of the whole crust is 55km and 6.22 km/s respectively. (3) There is a high-velocity rock body near the surface of the axial area of the tectonic belt, and it is probably related to the enrichment of the Panzhihua type sefstr(?)mite in this district. (4) There is a low-velocity zone with a thickness of about 9-14 km a,t the lower part of the midcrust. The top of this low-velocity zone is located at about 23-27 km deep from the surface. The consistence of this result with the distribution of earthquake foci and the depth of Curie isotherm indicates that the existence of the low-velocity zone maybe related to the thermal state of the crust medium. (5) There are several faults which reach into the upper mantle and a high-velocity interlayer at the top of the lower crust. These may signify intrusion of the mantle substance into the crust. (6) A velocity VPn of 7.62-7.90 km/s at the uppermost mantle is consistent with that of recent continental rifting zone. After comparison with other regions in the world, we infer that the Panxi region is perhaps a paleorift zone, but it was strongly transformed by later period's tec-togenesis.
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