The continental rift system of the Rhinegraben —structure, physical properties and dynamical processes

1981 ◽  
Vol 73 (1-3) ◽  
pp. 79-90 ◽  
Author(s):  
K Fuchs ◽  
K.P Bonjer ◽  
C Prodehl
Keyword(s):  
Physical Properties ◽  
Continental Rift ◽  
Rift System ◽  
Dynamical Processes

scholarly journals Close-range remote sensing of Saturn’s rings during Cassini’s ring-grazing orbits and Grand Finale

Science ◽  
2019 ◽  
Vol 364 (6445) ◽  
pp. eaau1017 ◽  
Author(s):  
Matthew S. Tiscareno ◽  
Philip D. Nicholson ◽  
Jeffrey N. Cuzzi ◽  
Linda J. Spilker ◽  
Carl D. Murray ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Physical Properties ◽  
Optical Depth ◽  
Spectral Properties ◽  
Dynamical Processes ◽  
Ring Structures ◽  
Close Range ◽  
Saturn’S Rings ◽  
F Ring ◽  
Saturn's Rings

Saturn’s rings are an accessible exemplar of an astrophysical disk, tracing the Saturn system’s dynamical processes and history. We present close-range remote-sensing observations of the main rings from the Cassini spacecraft. We find detailed sculpting of the rings by embedded masses, and banded texture belts throughout the rings. Saturn-orbiting streams of material impact the F ring. There are fine-scaled correlations among optical depth, spectral properties, and temperature in the B ring, but anticorrelations within strong density waves in the A ring. There is no spectral distinction between plateaux and the rest of the C ring, whereas the region outward of the Keeler gap is spectrally distinct from nearby regions. These results likely indicate that radial stratification of particle physical properties, rather than compositional differences, is responsible for producing these ring structures.

scholarly journals Sr and Nd isotopic characteristics of 1.77-1.58 Ga rift-related granites and volcanics of the Goiás tin province, central Brazil

2001 ◽  
Vol 73 (2) ◽  
pp. 263-276 ◽  
Author(s):  
MÁRCIO M. PIMENTEL ◽  
NILSON F. BOTELHO
Keyword(s):  
Continental Rift ◽  
Rift System ◽  
Isotopic Data ◽  
Sialic Crust ◽  
Central Brazil ◽  
T Values

Supracrustal rocks of the Araí Group, together with coeval A-type granites represent a ca. 1.77-1.58 Ga old continental rift in Brazil. Two granite families are identified: the older (1.77 Ga) group forms small undeformed plutons, and the younger granites (ca. 1.58 Ga) constitute larger, deformed plutons. Sr-Nd isotopic data for these rocks indicate that the magmatism is mostly product of re-melting of Paleoproterozoic sialic crust. Initial Sr ratios for both granite families are ca 0.726 and 0.720. Most TDM model ages are between 2.58 and 1.80 Ga. epsilonND(T) values are between +3.6 and -11.9. Araí volcanics are bimodal, with basalts and dacites/rhyolites interlayered with continental sediments. The felsic volcanics show Nd isotopic characteristics which are very similar to the granites, and are also interpreted as reworking of Paleoproterozoic crust. Detrital sediments of the Araí Group revealed T DM model ages between 2.4 and 2.16 Ga, indicating that they are the product of erosion of Paleoproterozoic crust. The data indicate that the Araí rift system was established on crust that had just become stable after the Paleoproterozoic orogeny.

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