504 resultados para 979


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Paleomagnetic and rock magnetic measurements of basalt specimens from DSDP Hole 504B, associated with the Costa Rica Rift, have a mean natural remanence intensity (Jn) between 5 and 10 x 10**-3 gauss, consistent with the presence of a magnetized layer that is 0.5 to 1 km thick, which produces the observed magnetic anomalies. A mean Koenigsberger ratio (Qn) greater than 10 indicates that the remanence dominates the magnetic signal of the drilled section. The susceptibility (x) increases with depth, and the median demagnetizing field (MDF) decreases with increasing depth in Hole 504B, congruent with the downhole increase in the relative abundance of massive flow units. Hole 504B is composed of at least 12 units with distinct stable average inclinations (Is), which probably represent extrusion at times of different geomagnetic field directions and possibly also the effects of faulting. The thickness of basalt associated with these inclination units varies from less than 9 meters to possibly as much as 160 meters. Two relatively thick magnetic units (40 m and 45 m, separated by 100 m) have anomalously high Is values of -53° and -63°, in contrast with the near zero inclinations expected for the equatorial latitude of Site 504. For this reason and because the average inclination of all the magnetic units is skewed to a negative value, it might be that the entire section at Hole 504B was tilted by approximately 30°.

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"PN-AAH-979"--Cover.

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Encuadernado en papel jaspeado.

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Mode of access: Internet.

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Mode of access: Internet.

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pt. 1. January 27, 29, 1947,. 76 p.--pt. 2. February 3, 5, 7, 1947. pp. 77-216.--pt. 3. February 19, 21, 1947. pp. 217-280.--pt. 4. February 24-28, 1947. pp. 281-426.--pt. 5. March 3-17, 1947. pp. 427-562.--pt. 6. March 19-April 3, 1947. pp. 563-625.--pt. 7. April 14-21, 1947. pp. 627-710.--pt. 8. April 28, May 2, 5, 7, 12, 14, 1947. pp. 711-863.p--pt. 9. May 21, June 9, 1947. pp. 865-967.--pt. 10. Corespondence and reports. 1947. pp. 979-1010.

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Index for the Acts of 1865-66, 1866-67, and of the Extra session, 1867, at end of volume, with title: General index. Sessions 1865-6 and 1866-7.

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Pages extracted from a program from the Lateinische Hauptschule in Halle, 1837.