2015 Fiscal Year Final Research Report
Neoproterozoic to Early Palaeozoic continental collision and breakup tectonics in the Sor Rondane Mountains and the Lutzow-Holm Bay area, East Antarctica
| Project/Area Number |
25400483
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Niigata University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 東南極 / ゴンドワナ超大陸 / リュツォホルム岩体 / セールロンダーネ山地 / 大陸衝突 / 断層 / 褶曲 / 大構造 |
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| Outline of Final Research Achievements |
In this paper we clarify the history of deformation in the Sor Rondane Mountains (SRMs) and the Lutzow-Holm Complex (LHC), East Antarctica, and construct their form-line contour maps and cross sections of the metamorphic and plutonic rocks in order to comprehend their structural features and provide constraints on the collisional tectonics of East and West Gondwana.
Geological features of the SRMs resulted from collisional metamorphism and deformation (640-600 Ma), through crustal thinning, horizontal extension or compression after 600 Ma, sinistral transpression (600-560 Ma), to horizontal extension related to dextral shearing (560-550 Ma) in the East African and Antarctic Orogen (EAAO).
The LHC is not uniform and includes several types of metamorphic units or fragments of the Latest Proterozoic to Early Paleozoic crust that were formed through distinct P-T-t evolutionary processes and divided by several faults. The LHC may have been situated in a different orogen from the EAAO.
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| Free Research Field |
地質学
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