| Distribution of large-scale detachment faults on mid-ocean ridges in relation to spreading rates | |
Yu Zhiteng1,2; Li Jiabiao1,2; Liang Yuyang1,2,3; Han Xiqiu1,2; Zhang Jie1,2 ; Zhu Lei4; Li, JB
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| 2013-12-01 | |
| 发表期刊 | ACTA OCEANOLOGICA SINICA
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| ISSN | 0253-505X |
| 卷号 | 32期号:12页码:109-117 |
| 文章类型 | Article |
| 摘要 | Large-scale detachment faults on mid-ocean ridges (MORs) provide a window into the deeper earth. They have megamullion on their corrugated surfaces, with exposed lower crustal and upper mantle rocks, relatively high residual Bouguer gravity anomaly and P-wave velocity, and are commonly associated with oceanic core complex. According to 30 detachment faults identified on MORs, we found that their distances to the axis mostly range from 5 to 50 km, half-spreading rates range from 6.8 to 17 mm/a, and activity time ranges from recent to 3 Ma. Most of the detachment faults are developed on the slow spreading Mid-Atlantic Ridge (MAR) and ultra-slow spreading Southwest Indian Ridge (SWIR), with the dominant half-spreading rates of 7-13 mm/a, especially 10-13 mm/a. Furthermore, they mostly occur at the inside corner of one segment end and result in an asymmetric seafloor spreading. The detachment faults on MORs are mainly controlled by the tectonism and influenced by the magmatism. Long-lived detachment faults tend to be formed where the ridge magma supply is at a moderate level, although the tectonism is a first-order controlling factor. At the slow spreading ridges, detachment faults tend to occur where local magma supply is relatively low, whilst at the ultra-slow spreading ridges, they normally occur where local magma supply is relatively high. These faults are accompanied by hydrothermal activities, with their relationships being useful in the study of hydrothermal polymetallic sulfides and their origin.; Large-scale detachment faults on mid-ocean ridges (MORs) provide a window into the deeper earth. They have megamullion on their corrugated surfaces, with exposed lower crustal and upper mantle rocks, relatively high residual Bouguer gravity anomaly and P-wave velocity, and are commonly associated with oceanic core complex. According to 30 detachment faults identified on MORs, we found that their distances to the axis mostly range from 5 to 50 km, half-spreading rates range from 6.8 to 17 mm/a, and activity time ranges from recent to 3 Ma. Most of the detachment faults are developed on the slow spreading Mid-Atlantic Ridge (MAR) and ultra-slow spreading Southwest Indian Ridge (SWIR), with the dominant half-spreading rates of 7-13 mm/a, especially 10-13 mm/a. Furthermore, they mostly occur at the inside corner of one segment end and result in an asymmetric seafloor spreading. The detachment faults on MORs are mainly controlled by the tectonism and influenced by the magmatism. Long-lived detachment faults tend to be formed where the ridge magma supply is at a moderate level, although the tectonism is a first-order controlling factor. At the slow spreading ridges, detachment faults tend to occur where local magma supply is relatively low, whilst at the ultra-slow spreading ridges, they normally occur where local magma supply is relatively high. These faults are accompanied by hydrothermal activities, with their relationships being useful in the study of hydrothermal polymetallic sulfides and their origin. |
| 关键词 | Detachment Faults Oceanic Core Complex Spreading Rates Distribution Tectonism Magma Supply Hydrothermal Vents |
| 学科领域 | Oceanography |
| DOI | 10.1007/s13131-013-0397-y |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Oceanography |
| WOS类目 | Oceanography |
| WOS记录号 | WOS:000328528400014 |
| WOS关键词 | MID-ATLANTIC RIDGE ; OCEANIC CORE COMPLEXES ; SOUTHWEST INDIAN RIDGE ; SEA-FLOOR ; HYDROTHERMAL VENTS ; MASSIF ; MEGAMULLION ; CRUST ; BANK ; ACCRETION |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/16299 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Li, JB |
| 作者单位 | 1.State Ocean Adm, Key Lab Submarine Geosci, Hangzhou 810012, Zhejiang, Peoples R China 2.State Ocean Adm, Inst Oceanog 2, Hangzhou 810012, Zhejiang, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 4.China Ocean Mineral Resources Res & Dev Assoc, Beijing 100860, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu Zhiteng,Li Jiabiao,Liang Yuyang,et al. Distribution of large-scale detachment faults on mid-ocean ridges in relation to spreading rates[J]. ACTA OCEANOLOGICA SINICA,2013,32(12):109-117. |
| APA | Yu Zhiteng.,Li Jiabiao.,Liang Yuyang.,Han Xiqiu.,Zhang Jie.,...&Li, JB.(2013).Distribution of large-scale detachment faults on mid-ocean ridges in relation to spreading rates.ACTA OCEANOLOGICA SINICA,32(12),109-117. |
| MLA | Yu Zhiteng,et al."Distribution of large-scale detachment faults on mid-ocean ridges in relation to spreading rates".ACTA OCEANOLOGICA SINICA 32.12(2013):109-117. |
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