2017 Fiscal Year Final Research Report
Petrological study of Archean continental fragments in the Neoproterozoic Gondwana collisional orogen
| Project/Area Number |
26302009
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 海外学術 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
堤 之恭 独立行政法人国立科学博物館, 地学研究部, 研究主幹 (00370990)
M. SANTOSH 高知大学, 名誉教授 (20333453)
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Keywords | ゴンドワナ / 大陸衝突帯 / 変成作用 / ジルコン年代 / インド / 南極 |
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| Outline of Final Research Achievements |
This study evaluated the amalgamation processes of Archean to Neoproterozoic microcontinents and magmatic arcs to form Gondwana Supercontinent during the latest Neoproterozoic to Cambrian. Based on detailed petrological and geochronological investigations, Neoarchean continental fragments were newly found from the Lutzow-Holm Complex (East Antarctica) and the Zambezi Metamorphic Belt (Zimbabwe) which collided with adjacent Proterozoic magmatic arcs and formed larger continents. Sri Lanka is composed of two Neoproterozoic magmatic arcs (the Wanni Complex to the west and the Vijayan Complex to the east) which were formed by double-sided subduction of an oceanic plate. The two arcs collided at around 550 Ma and formed a major suture zone (the Highland Complex) and ultrahigh-temperature metamorphic rocks in this region. This study also pointed out that the Vijayan Complex (Sri Lanka) and the northern part of the Lutzow-Holm Complex (Antarctica) could have been a single magmatic arc.
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| Free Research Field |
岩石学
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