Seismic Refraction in the Prediction of Mineral Occurrences on the Basis of Crustal Tectonic Features of the Middle Segment of the Tancheng-Lujiang Paleorift Valley
Liu Changquan, 1989. "Seismic Refraction in the Prediction of Mineral Occurrences on the Basis of Crustal Tectonic Features of the Middle Segment of the Tancheng-Lujiang Paleorift Valley", An Overview of Exploration Geophysics in China — 1988, Zhao Jingxiang, Wang Yanjun, Fu Xuexin, Stanley H. Ward
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A seismic refraction sounding along the Lianyungang-Linyi-Sishui profile crossing the middle segment of the Tancheng-Lujiang Paleorift Valley has been performed by using a reversed and overlapped set of observations. The profile is 330 km long with an azimuth of 304 degrees. A two-dimensional section of velocity structure has been obtained with dynamic ray tracing. From the results of the interpretation the crust can be divided into three layers. In the upper crust the velocity contours rise up at the paleorift valley, with the rise shifting eastward gradually from shallow to deep, indicating the existence of high-angle faults. The middle crust is a set of alternating velocity layers; and velocity structures are different on the west and east sides of the paleorift valley. There are three low-velocity layers in the middle crust and lateral inhomogeneity of the low-velocity layer may be evidence of a deep fault. The Moho discontinuity has been strongly flexed at the paleorift valley. It is inferred that the paleorift valley area and its west side should be a favorable place for prospecting for large-scale iron and copper deposits and primary diamond deposits, while the east side of the rift should be good for searching for mineral resources related to magma from deep reservoirs and post-magmatic processes.