| タイトル | Identification of a precambrian rift through Missouri by digital image processing of geophysical and geological data |
| 著者（英） | Guinness, E. A.; Davies, G. F.; Arvidson, R. E.; Schulz, K. J.; Leff, C. E.; Strebeck, J. W. |
| 著者所属（英） | Washington Univ. |
| 発行日 | 1982-10-10 |
| 言語 | eng |
| 内容記述 | A newly discovered feature in the midcontinent - a gravity low that begins at a break in the midcontinent gravity high in SE Nebraska, extends across Missouri in a NW-SE direction, and intersects the Mississippi Valley graben to form the Pascola arch - is discussed. The anomaly varies from 120 to 160 km in width, extends approximately 700 km, and is best expressed in southern Missouri, where it has a Bouguer amplitude of about -34 mGal. It is noted that the magnitude of the anomaly cannot be explained on the basis of a thickened section of Paleozoic sedimentary rock. The gravity data and the sparse seismic refraction data for the region are found to be consistent with an increased crustal thickness beneath the gravity low. It is thought that the gravity anomaly is probably the present expression of a failed arm of a rifting event, perhaps one associated with the spreading that led to or preceded formation of the granite and rhyolite terrain of southern Missouri. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 82A47699 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/408593 |
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