ORCID Profile
0000-0002-9440-7172
Current Organisations
Miyagi university of Education
,
Universidade de São Paulo
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Publisher: American Astronomical Society
Date: 12-2017
Publisher: American Astronomical Society
Date: 21-05-2010
Publisher: American Physical Society (APS)
Date: 26-02-2020
Publisher: Elsevier BV
Date: 11-2010
Publisher: Geological Society of London
Date: 13-08-2007
Publisher: FapUNIFESP (SciELO)
Date: 2020
Publisher: American Astronomical Society
Date: 06-07-2012
Publisher: EDP Sciences
Date: 07-2010
Publisher: Springer Science and Business Media LLC
Date: 16-10-2014
DOI: 10.1038/NCOMMS6198
Abstract: The deeply eroded West Gondwana Orogen is a major continental collision zone that exposes numerous occurrences of deeply subducted rocks, such as eclogites. The position of these eclogites marks the suture zone between colliding cratons, and the age of metamorphism constrains the transition from subduction-dominated tectonics to continental collision and mountain building. Here we investigate the metamorphic conditions and age of high-pressure and ultrahigh-pressure eclogites from Mali, Togo and NE-Brazil and demonstrate that continental subduction occurred within 20 million years over at least a 2,500-km-long section of the orogen during the Ediacaran. We consider this to be the earliest evidence of large-scale deep-continental subduction and consequent appearance of Himalayan-scale mountains in the geological record. The rise and subsequent erosion of such mountains in the Late Ediacaran is perfectly timed to deliver sediments and nutrients that are thought to have been necessary for the subsequent evolution of sustainable life on Earth.
Publisher: FapUNIFESP (SciELO)
Date: 03-2014
Publisher: American Association for the Advancement of Science (AAAS)
Date: 16-08-2019
Abstract: The general theory of relativity predicts that a star passing close to a supermassive black hole should exhibit a relativistic redshift. In this study, we used observations of the Galactic Center star S0-2 to test this prediction. We combined existing spectroscopic and astrometric measurements from 1995-2017, which cover S0-2's 16-year orbit, with measurements from March to September 2018, which cover three events during S0-2's closest approach to the black hole. We detected a combination of special relativistic and gravitational redshift, quantified using the redshift parameter ϒ. Our result, ϒ = 0.88 ± 0.17, is consistent with general relativity (ϒ = 1) and excludes a Newtonian model (ϒ = 0) with a statistical significance of 5σ.
Publisher: Elsevier BV
Date: 04-2004
Publisher: Springer Science and Business Media LLC
Date: 05-2018
Location: United States of America
No related grants have been discovered for S. Nishiyama.