Discovery of Paleozoic rocks at northern margin of Sambagawa terrane, eastern Kyushu, Japan: Petrogenesis, U–Pb geochronology and its tectonic implication
Ordovician diorite-quartz diorite mylonite (Saganoseki quartz diorite) was discovered in Sambagawa metamorphic terrane at the northern margin of Saganoseki Peninsula, Kyushu Island, Japan. The LA-ICP-MS zircon U–Pb geochronology revealed that the intrusion age of Saganoseki quartz diorite was 473.3 ...
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Elsevier
2020-07-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987120300207 |
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| author | Kenta Kawaguchi Yasutaka Hayasaka Tomoyuki Shibata Masayuki Komatsu Kosuke Kimura Kaushik Das |
| author_facet | Kenta Kawaguchi Yasutaka Hayasaka Tomoyuki Shibata Masayuki Komatsu Kosuke Kimura Kaushik Das |
| author_sort | Kenta Kawaguchi |
| collection | DOAJ |
| description | Ordovician diorite-quartz diorite mylonite (Saganoseki quartz diorite) was discovered in Sambagawa metamorphic terrane at the northern margin of Saganoseki Peninsula, Kyushu Island, Japan. The LA-ICP-MS zircon U–Pb geochronology revealed that the intrusion age of Saganoseki quartz diorite was 473.3 ± 3.6 Ma. These rocks show the volcanic arc affinity based on the trace element composition. On the basis of geochronological and geochemical results, Saganoseki quartz diorite is considered to be a member of the Early Paleozoic igneous rocks of the Kurosegawa tectonic zone. Saganoseki quartz diorite is located just south of the Median Tectonic Line (MTL) and is in close contact with the pelitic and psammitic schist without any brittle shear zone. U–Pb ages of detrital zircon grains from two psammitic schists show the estimated sedimentation age of early Late Cretaceous, indicate that these psammitic schists are the member of Sambagawa metamorphic rocks. Together with these results and the mode of occurrence in the field, we argue that the Early Paleozoic igneous rocks of the Kurosegawa tectonic zone existed as an upper structural unit of the Sambagawa terrane. This relationship is the key to reconstruct the Mesozoic tectonics of Japan as a part of East Asia, and its evolution through time. |
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| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T06:43:57Z |
| publishDate | 2020-07-01 |
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| series | Geoscience Frontiers |
| spelling | doaj.art-244165b522e447559d9cc623c187d46c2023-09-03T00:41:28ZengElsevierGeoscience Frontiers1674-98712020-07-0111414411459Discovery of Paleozoic rocks at northern margin of Sambagawa terrane, eastern Kyushu, Japan: Petrogenesis, U–Pb geochronology and its tectonic implicationKenta Kawaguchi0Yasutaka Hayasaka1Tomoyuki Shibata2Masayuki Komatsu3Kosuke Kimura4Kaushik Das5Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan; Corresponding author.Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan; Hiroshima Institute of Plate Convergence Region Research, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, JapanDepartment of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan; Hiroshima Institute of Plate Convergence Region Research, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, JapanEhime University, 10-13 Dogo-Himata, Matsuyama, Ehime, 790-8577, JapanDepartment of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, JapanDepartment of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan; Hiroshima Institute of Plate Convergence Region Research, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, JapanOrdovician diorite-quartz diorite mylonite (Saganoseki quartz diorite) was discovered in Sambagawa metamorphic terrane at the northern margin of Saganoseki Peninsula, Kyushu Island, Japan. The LA-ICP-MS zircon U–Pb geochronology revealed that the intrusion age of Saganoseki quartz diorite was 473.3 ± 3.6 Ma. These rocks show the volcanic arc affinity based on the trace element composition. On the basis of geochronological and geochemical results, Saganoseki quartz diorite is considered to be a member of the Early Paleozoic igneous rocks of the Kurosegawa tectonic zone. Saganoseki quartz diorite is located just south of the Median Tectonic Line (MTL) and is in close contact with the pelitic and psammitic schist without any brittle shear zone. U–Pb ages of detrital zircon grains from two psammitic schists show the estimated sedimentation age of early Late Cretaceous, indicate that these psammitic schists are the member of Sambagawa metamorphic rocks. Together with these results and the mode of occurrence in the field, we argue that the Early Paleozoic igneous rocks of the Kurosegawa tectonic zone existed as an upper structural unit of the Sambagawa terrane. This relationship is the key to reconstruct the Mesozoic tectonics of Japan as a part of East Asia, and its evolution through time.http://www.sciencedirect.com/science/article/pii/S1674987120300207Outer zone of southwest JapanSambagawa metamorphic terraneKurosegawa tectonic zoneLA-ICP-MS zircon U–Pb ageSaganoseki quartz diorite |
| spellingShingle | Kenta Kawaguchi Yasutaka Hayasaka Tomoyuki Shibata Masayuki Komatsu Kosuke Kimura Kaushik Das Discovery of Paleozoic rocks at northern margin of Sambagawa terrane, eastern Kyushu, Japan: Petrogenesis, U–Pb geochronology and its tectonic implication Geoscience Frontiers Outer zone of southwest Japan Sambagawa metamorphic terrane Kurosegawa tectonic zone LA-ICP-MS zircon U–Pb age Saganoseki quartz diorite |
| title | Discovery of Paleozoic rocks at northern margin of Sambagawa terrane, eastern Kyushu, Japan: Petrogenesis, U–Pb geochronology and its tectonic implication |
| title_full | Discovery of Paleozoic rocks at northern margin of Sambagawa terrane, eastern Kyushu, Japan: Petrogenesis, U–Pb geochronology and its tectonic implication |
| title_fullStr | Discovery of Paleozoic rocks at northern margin of Sambagawa terrane, eastern Kyushu, Japan: Petrogenesis, U–Pb geochronology and its tectonic implication |
| title_full_unstemmed | Discovery of Paleozoic rocks at northern margin of Sambagawa terrane, eastern Kyushu, Japan: Petrogenesis, U–Pb geochronology and its tectonic implication |
| title_short | Discovery of Paleozoic rocks at northern margin of Sambagawa terrane, eastern Kyushu, Japan: Petrogenesis, U–Pb geochronology and its tectonic implication |
| title_sort | discovery of paleozoic rocks at northern margin of sambagawa terrane eastern kyushu japan petrogenesis u pb geochronology and its tectonic implication |
| topic | Outer zone of southwest Japan Sambagawa metamorphic terrane Kurosegawa tectonic zone LA-ICP-MS zircon U–Pb age Saganoseki quartz diorite |
| url | http://www.sciencedirect.com/science/article/pii/S1674987120300207 |
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