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Abstract ▼ AI-Helper

The subsurface distribution of granitoids was investigated in the southern part of the Korean Peninsula according to gravity anomaly calculated from the gravity data at 11,248 points in this region. The isostatic anomaly rather than the Bouguer anomaly was used in this study because the former is fo...

The subsurface distribution of granitoids was investigated in the southern part of the Korean Peninsula according to gravity anomaly calculated from the gravity data at 11,248 points in this region. The isostatic anomaly rather than the Bouguer anomaly was used in this study because the former is found to be more suitable for revealing the shallow subsurface structure and geology of wide areas than the latter. In addition, the gravity anomaly map can uncover the vertical distribution and amount of granitoids that were not exposed in the surface. On the characteristics of granitoids distribution: First, it is found that due to their low density the granitoids are distributed along the low gravity anomalies. Isostatic anomaly map shows the consistent surface distribution patterns of the granitoids, which are aligned along the south-west to the north-east direction in the southern part of the Korean peninsula except the younger ones of Cretaceous to Tertiary. Second, it is also found that a great amount of subsurface granitoids are distributed in the middle and western part of the study area, while those of the eastern part of the Gyeonggi Massif are smaller than the case. Third, the young Cretaceous granitoids are thought to be small in size not only in surface but also in vertical distribution since the low gravity signals are not remarkable along the areas of Gyeongsang Basin, Yeongnam Massif, Taebaeksan and Sobaeksan area except the Jurassic granitoids of Namwon to Dukyusan. Forth, the older granitoids are inferred to extend to depth up to 10-20 ㎞. Our gravity inversion analysis results suggest that the Chugaryeong granites are extended to 18 ㎞ thick.

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