Distribution of large-scale detachment faults on mid-ocean ridges in relation to spreading rates

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Distribution of large-scale detachment faults on mid-ocean ridges in relation to spreading rates
	Yu Zhiteng 1,2; Li Jiabiao 1,2; Liang Yuyang 1,2,3; Han Xiqiu 1,2; Zhang Jie1,2 ; Zhu Lei 4
刊名	ACTA OCEANOLOGICA SINICA
	2013-12-01
卷号	32 期号:12 页码:109-117
关键词	detachment faults oceanic core complex spreading rates distribution tectonism magma supply hydrothermal vents
ISSN号	0253-505X
通讯作者	Li, JB
中文摘要	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.
英文摘要	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.
学科主题	Oceanography
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Oceanography
研究领域[WOS]	Oceanography
关键词[WOS]	MID-ATLANTIC RIDGE ; OCEANIC CORE COMPLEXES ; SOUTHWEST INDIAN RIDGE ; SEA-FLOOR ; HYDROTHERMAL VENTS ; MASSIF ; MEGAMULLION ; CRUST ; BANK ; ACCRETION
收录类别	SCI
原文出处	10.1007/s13131-013-0397-y
语种	英语
WOS记录号	WOS:000328528400014
公开日期	2014-07-17
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/16299]
专题	海洋研究所_海洋地质与环境重点实验室
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,&Zhu Lei.(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.