Computer Science
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ep%26s...51..337d&link_type=abstract
Earth, Planets and Space, Volume 51, p. 337-349.
Computer Science
4
Scientific paper
Paleomagnetic results are obtained from 41 sites from the Chopyeong Formation within the Eumsung basin, located along the northern boundary of the Ogcheon Belt, Korea. The Chopyeong Formation, depositeD/In early Cretaceous, yields the mean direction of D/I= 347.8°/57.3° (k= 92.8, a95= 2.5°) before tilt correction, and D/I= 0.7°/61.7° (k= 19.6, a95= 5.5°) after tilt correction. The parameter estimating fold test and the stepwise unfolding test of the red bed and greenish mudstone of the Chopyeong Formation yield the maximum value of kat 21.9% and at 20% untilting, respectively, indicating that the remanence whose mean direction of D/I= 350.8°/57.9° (k= 177.9, a95= 1.8°) at 20% untilting was acquired during or after tilting of the strata. The comparison of the paleomagnetic pole from the Chopyeong Formation with those from the Youngdong basin and the Euiseong area in the Gyeongsang basin indicates that the remanence was acquired during late Cretaceous to early Tertiary. Electron microscope observations and rock magnetic experiments show that secondary hematite and magnetite grains of single domain to pseudo-single domain size were authigenically formed under the influence of fluids presumably triggered by the igneous activities, thus confirm the chemical remagnetization.It is revealed that the age of the granite in the east is Jurassic because the mean direction of the east granite (D/I= 347.0°/47.7°, k= 40.2, a95= 3.6°) is similar to the Jurassic direction of Korea Peninsula. The age of the granite in the west, however, is left undetermined whether it is Cretaceous or Jurassic because of the weak intensity anD/Instability of the remanence of the granite during demagnetization treatments.
Doh Seong-Jae
Kim Yong Baek
Suk D.-W.
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