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- Routh, Joyanto, 1968-
(författare)
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Metamorphism and Structural Interpretation of the Zanskar Shear Zone, PJW Himalaya, India
- 1993
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Ingår i: Journal of the Geological Society of India. - : Geological society of India. - 0016-7622 .- 0974-6889. ; 41:3, s. 187-198
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Tidskriftsartikel (refereegranskat)abstract
- Herren in 1987, reported normal faults resulted in the telescoping of metamorphic isograds within a 200 meter zone between Sumche Topko to Mulung Topko in the Zanskar Shear Zone NW Himalaya. However petrographic study-of sections obtained from Mulung Topko and surrounding areas (pensila-padarn section) indicate that the rocks belong to the kyanite-sillimanite-starurolite grade only. Extension crenulation cleavage and other shear criteria show an initial NESW movement after which a layer parallel extension occurred and the shear zone developed. Minieralogical assemblage and mapping indicate that the isograds run paralleI to each other before they possibly truncate against the shear zone along the Pensila-Padam section. A probable model has been proposed to explain the features
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| 2. |
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| 3. |
- Bornmalm, Lennart, 1956, et al.
(författare)
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COILING PATTERNS IN 4 BENTHIC FORAMINIFERAL SPECIES THROUGH THE TERMINAL MIOCENE AND PLIOCENE IN THE CARIBBEAN SEA
- 1993
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Ingår i: Journal of Foraminiferal Research. - 0096-1191. ; 23:2, s. 118-122
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Tidskriftsartikel (refereegranskat)abstract
- Coiling patterns in four epibenthic foraminiferal species, Nuttallides umbonifera, Oridorsalis umbonatus, Cibicidoides wuellerstorfi and Epistominella exigua have been analysed in Deep Sea Drilling Project (DSDP) Hole 502A, located in the Colombia Basin, western Caribbean Sea. The studied sequence represents the time interval between 5.47 and 1.72 Ma. Oridorsalis umbonatus is dominantly dextrally coiled in four intervals, 3.9, 3.6-3.4, 2.6, and 1.9 Ma; in all other samples the species is randomly coiled. Epistominella exigua is also randomly coiled in most of the samples where coiling ratios could be determined, except in one sample from 3.6 Ma, where coiling is predominantly dextral. Consequently, E. exigua exhibits dextral coiling in one of the samples, where also O. umbonatus is dextrally coiled. Because sufficiently large sample sizes of E. exigua and O. umbonatus could not be obtained for the intervals of increased deltaO-18 values between 3.2-3.0 Ma and between 2.3-2.2 Ma, the influence of cooling events on coiling ratios in these species could not be assessed. The other two species investigated, N. umbonifera and C. wuellerstorfi, are randomly coiled throughout the studied sequence.
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| 4. |
- Elgered, Gunnar, 1955, et al.
(författare)
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Geodesy by Radio Interferometry: Water Vapor Radiometry for Estimation of the Wet Delay
- 1991
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Ingår i: Journal of Geophysical Research. - 0148-0227 .- 2156-2202. ; 96:B4, s. 6541-6555
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Tidskriftsartikel (refereegranskat)abstract
- An important source of error in very-long-baseline interferometry (VLBI) estimates of baseline length is unmodeled variations of the refractivity of the neutral atmosphere along the propagation path of the radio signals. We present and discuss the method of using data from a water vapor radiometer (WVR) to correct for the propagation delay caused by atmospheric water vapor, the major cause of these variations. Data from different WVRs are compared with estimated propagation delays obtained by Kalman filtering of the VLBI data themselves. The consequences of using either WVR data or Kalman filtering to correct for atmospheric propagation delay at the Onsala VLBI site are investigated by studying the repeatability of estimated baseline lengths from Onsala to several other sites. The lengths of the baselines range from 919 to 7941 km. The repeatability obtained for baseline length estimates shows that the methods of water vapor radiometry and Kalman filtering offer comparable accuracies when applied to VLBI observations obtained in the climate of the Swedish west coast. For the most frequently measured baseline in this study, the use of WVR data yielded a 13% smaller weighted-root-mean-square (WRMS) scatter of the baseline length estimates compared to the use of a Kalman filter. It is also clear that the “best” minimum elevation angle for VLBI observations depends on the accuracy of the determinations of the total propagation delay to be used, since the error in this delay increases with increasing air mass. For use of WVR data along with accurate determinations of total surface pressure, the best minimum is about 20 degrees; for use of a model for the wet delay based on the humidity and temperature at the ground, the best minimum is about 35 degrees.
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| 5. |
- Königsson, Lars-König, 1933-, et al.
(författare)
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Människa, Ekonomi och Miljö i Gamla Uppsala
- 1993
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Ingår i: Arkeologi och miljögeologi i Gamla Uppsala. - Uppsala : Societas archaelogica Upsaliensis. - 9150609734 ; , s. 79-86, s. 79-86
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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