DOI: 10.1007/s00531-016-1437-6
Scopus记录号: 2-s2.0-85010789987
论文题名: Early Paleozoic subduction initiation volcanism of the Iwatsubodani Formation, Hida Gaien belt, Southwest Japan
作者: Tsukada K. ; Yamamoto K. ; Gantumur O. ; Nuramkhaan M.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2017
卷: 106, 期: 4 起始页码: 1429
结束页码: 1451
语种: 英语
英文关键词: Fore-arc basalt (FAB)
; Fukuji area (Gifu Pref.)
; Hitoegane succession
; Volcanic arc at SSZ
Scopus关键词: basalt
; island arc
; lithostratigraphy
; ophiolite
; Paleozoic
; subduction zone
; tectonic setting
; volcanism
; Chubu
; Gifu
; Hida Belt
; Honshu
; Japan
英文摘要:
In placing Japanese tectonics in an Asian context, variation in the Paleozoic geological environment is a significant issue. This paper investigates the geochemistry of the lower Paleozoic basalt formation (Iwatsubodani Formation) in the Hida Gaien belt, Japan, to consider its tectonic setting. This formation includes the following two types of rock in ascending order: basalt A with sub-ophitic texture and basalt B with porphyritic texture. Basalt A has a high and uniform FeO*/MgO ratio, moderate TiO2, high V, and low Ti/V. The HFSE and REE are nearly the same as those in MORB, and all the data points to basalt A being the “MORB-like fore-arc tholeiitic basalt (FAB)” reported, for example, from the Izu–Bonin–Mariana arc. By contrast, basalt B has a low FeO*/MgO ratio, low TiO2, and low V and Ti/V. It has an LREE-enriched trend and a distinct negative Nb anomaly in the MORB-normalized multi-element pattern and a moderately high LREE/HREE. All these factors suggest that basalt B is calc-alkaline basalt. It is known that FAB is erupted at the earliest stage of arc formation—namely, subduction initiation—and that boninitic/tholeiitic/calc-alkaline volcanism follows at the supra-subduction zone (SSZ). Thus, the occurrence of basalts A (FAB) and B (calc-alkaline rock) is strong evidence of early Paleozoic arc-formation initiation at an SSZ. Evidence for an early Paleozoic SSZ arc is also recognized from the Oeyama, Hayachine-Miyamori, and Sergeevka ophiolites. Hence, both these ophiolites and the Iwatsubodani Formation probably coexisted in a primitive SSZ system in the early Paleozoic. © 2017, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85010789987&doi=10.1007%2fs00531-016-1437-6&partnerID=40&md5=59078c5b70888adfb82bb45f8e12cbbf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70027
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: The Nagoya University Museum, Nagoya, Japan; Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan; School of Geology and Mining, Mongolian University of Science and Technology, Ulaanbaatar, Mongolia
Recommended Citation:
Tsukada K.,Yamamoto K.,Gantumur O.,et al. Early Paleozoic subduction initiation volcanism of the Iwatsubodani Formation, Hida Gaien belt, Southwest Japan[J]. International Journal of Earth Sciences,2017-01-01,106(4)