ACTIVE DISPLACEMENT PARTITIONING AND ARC-PARALLEL EXTENSION OF THE ALEUTIAN VOLCANIC ARC BASED ON GLOBAL POSITIONING SYSTEM GEODESY AND KINEMATIC ANALYSIS
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dc.contributor.author | Avé Lallemant H.G. | |
dc.contributor.author | Oldow J.S. | |
dc.date.accessioned | 2021-02-01T12:08:59Z | |
dc.date.available | 2021-02-01T12:08:59Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=31701777 | |
dc.identifier.citation | Geology, 2000, 28, 8, 739-742 | |
dc.identifier.issn | 0091-7613 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24354 | |
dc.description.abstract | Global Positioning System geodesy and structural analysis of parts of the Aleutian island chain support the interpretation of forearc migration westward along right-lateral transcurrent faults. Measured displacements are essentially arc parallel in the eastern (Unalaska Island) and western (Attu Island) parts of the arc and vary from 3.1 mm/yr to 31.4 mm/yr, respectively. At the center of the arc (Adak) subduction of the Amlia fracture zone disrupts the pattern of arc-parallel displacement and records an upper plate velocity of 9.6 mm/yr parallel to plate motion. Where active, displacement partitioning accommodates 30% 50% of the strike-slip component of plate convergence. In the area of impeded subduction partitioning ceases, suggesting that the process is sensitive to the degree of coupling across the plate-boundary megathrust. The differential arc-parallel displacements observed at the ends of the arc together with structural relations indicate substantial arc-parallel extension, which may play an important role in exhumation of high-pressure low-temperature metamorphic rocks in ancient arc systems. | |
dc.title | ACTIVE DISPLACEMENT PARTITIONING AND ARC-PARALLEL EXTENSION OF THE ALEUTIAN VOLCANIC ARC BASED ON GLOBAL POSITIONING SYSTEM GEODESY AND KINEMATIC ANALYSIS | |
dc.type | Статья |
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