Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B35202.1 |
The conversion tectonics from spreading to subduction: Paleostress analysis of dike swarms during the subduction initiation in the Oman Ophiolite | |
Umino, Susumu1,2; Kusano, Yuki3; Yamaji, Atsushi4; Fudai, Takahiro5; Tamura, Akihiro6; Arai, Shoji7 | |
2020-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2020 |
卷号 | 132期号:5-6页码:1333-1343 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | We present paleostress analyses of dike swarms intruded during the subduction initiation in the northern Oman Ophiolite to understand the tectonomagmatic environment. Five swarms of subparallel dikes extending WNW-ESE are 1-5 km in width and are spaced every 5 km N-S. Each swarm has a core of 100% sheeted dikes 1-2 km in width, which emanated from the dunitewherlite-clinopyroxenite-gabbronorite-diorite-tonalite complexes below and intruded through V1 and into V2 extrusive rocks. Individual dike strikes are varied but generally subparallel to the overall trend of the swarm. Paleostress analyses indicate sub-vertical sigma(1), similar to sigma(2), and subhorizontal sigma(3) with high magma pressures, resulted in the mutually intrusive, extensional shear dikes and abrupt changes in dike strike at high angles. These occurrences suggest intrusions under a more compressive environment compared to the extensional stress field that formed the N-S-striking sheeted dikes of V1 spreading stage. Most E-W-striking dikes possess both boninitic and tholeiitic geochemistry. The latter resemble the V1 flows and dikes with affinities of mid-ocean ridge basalt. Some tholeiitic dikes strike N-S, which are mutually intrusive to E-W-striking dikes. Tholeiitic dikes are more intensely altered than boninite, suggesting their older ages. Conversion of the stress field from a N-S-running spreading axis to inextensional E-W-running rift zones associated with the change in magma geochemistry agree with the relatively compressive V2 arc above a forced subduction zone, which originated from intraoceanic thrusting caused by the clockwise rotation of a microplate including the future northern ophiolite. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000530917400027 |
WOS关键词 | MIXED BINGHAM DISTRIBUTION ; IZU-BONIN-MARIANA ; SEMAIL-OPHIOLITE ; METAMORPHIC SOLE ; ARC ; MANTLE ; ZONE ; FLUID ; VOLCANISM ; SLAB |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279465 |
专题 | 地球科学 |
作者单位 | 1.Kanazawa Univ, Coll Sci & Engn, Kanazawa, Ishikawa 9201192, Japan; 2.Japan Agcy Marine Earth Sci & Technol, Natsushima 2-15, Yokosuka, Kanagawa 2370061, Japan; 3.Natl Inst Adv Ind Sci & Technol, Geol Survey Japan, Higashi 1-1-1, Tsukuba, Ibaraki 3058567, Japan; 4.Kyoto Univ, Div Earth & Planetary Sci, Sakyo Ku, Kyoto, Kyoto 6068502, Japan; 5.Kanazawa Univ, Grad Sch Nat Sci & Technol, Kakuma Machi, Kanazawa, Ishikawa 9201192, Japan; 6.Kanazawa Univ, Inst Nat & Environm Technol, Kakuma Machi, Kanazawa, Ishikawa 9201192, Japan; 7.Kanazawa Univ, Inst Liberal Arts & Sci, Kakuma Machi, Kanazawa, Ishikawa 9201192, Japan |
推荐引用方式 GB/T 7714 | Umino, Susumu,Kusano, Yuki,Yamaji, Atsushi,et al. The conversion tectonics from spreading to subduction: Paleostress analysis of dike swarms during the subduction initiation in the Oman Ophiolite[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(5-6):1333-1343. |
APA | Umino, Susumu,Kusano, Yuki,Yamaji, Atsushi,Fudai, Takahiro,Tamura, Akihiro,&Arai, Shoji.(2020).The conversion tectonics from spreading to subduction: Paleostress analysis of dike swarms during the subduction initiation in the Oman Ophiolite.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(5-6),1333-1343. |
MLA | Umino, Susumu,et al."The conversion tectonics from spreading to subduction: Paleostress analysis of dike swarms during the subduction initiation in the Oman Ophiolite".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.5-6(2020):1333-1343. |
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