| 저자(한글) |
김인수,민경덕,이미영,강희철,전희영,부산대학교 지질학과,연세대학교 지질학과,부산대학교 지질학과,부산대학교 지질학과,한국자원연구소 지사연구그룹 |
| 초록 |
A total of 111 independently oriented core samples were drilled at 12 sites in fue Kimpo area ($37.70^{ circ}N$, $126.55^{ circ}E$) of the Taedong Supergroup. The Taedong strata are composed of sandstone, conglomeratic sandstone, shale and thin coal seams. The age of the strata is known to be Late Triassic-Early Jurassic according to freshwater Esfuerites and plant fossil (Dictyophyllum-Clathropteris flora) contents. Through AF and thermal demagnetization, an area-mean ChRM direction of $D=48.3^{ circ} ;I=40.3^{ circ} ;{ alpha}_{95}=7.9^{ circ} ;k=59.5$, n=7 was obtained. It passed fold and reversal test in the formation-mean level. Fold test was not significant in the area-mean level. The palaeomagnetic north pole calculated from the area-mean lies at $46.3^{ circ}N$, $222.0^{ circ}E$ with dp=5.7, $dm=9.5^{ circ}$. This pole position is very similar to those of the South China Block (SCB) in Triassic times. Palaeolatitude of the Kimpo area in the Taedong times was $23.0^{ circ}N$, again very similar to the palaeolatitude of the South China Block in the Late Triassic. This low latitude of the study area at the time of deposition explains the tropical-subtropical nature of fossil contents of the Taedong Supergroup. |
