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DOI | 10.1038/s41561-018-0124-6 |
Episodic magmatism and serpentinized mantle exhumation at an ultraslow-spreading centre | |
Grevemeyer, Ingo1; Hayman, Nicholas W.2; Peirce, Christine3; Schwardt, Michaela4; Van Avendonk, Harm J. A.2; Dannowski, Anke1; Papenberg, Cord1 | |
2018-06-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:6页码:444-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; USA; England |
英文摘要 | Mid-ocean ridges spreading at ultraslow rates of less than 20 mm yr(-1) can exhume serpentinized mantle to the seafloor, or they can produce magmatic crust. However, seismic imaging of ultraslow-spreading centres has not been able to resolve the abundance of serpentinized mantle exhumation, and instead supports 2 to 5 km of crust. Most seismic crustal thickness estimates reflect the depth at which the 7.1 km s(-1) P-wave velocity is exceeded. Yet, the true nature of the oceanic lithosphere is more reliably deduced using the P-to S-wave velocity (V-p/V-s) ratio. Here we report on seismic data acquired along off-axis profiles of older oceanic lithosphere at the ultraslow-spreading Mid-Cayman Spreading Centre. We suggest that high V-p/V-s ratios greater than 1.9 and continuously increasing P-wave velocity, changing from 4 km s(-1) at the seafloor to greater than 7.4 km s(-1) at 2 to 4 km depth, indicate highly serpentinized peridotite exhumed to the seafloor. Elsewhere, either magmatic crust or serpentinized mantle deformed and uplifted at oceanic core complexes underlies areas of high bathymetry. The Cayman Trough therefore provides a window into mid-ocean ridge dynamics that switch between magma-rich and magma-poor oceanic crustal accretion, including exhumation of serpentinized mantle covering about 25% of the seafloor in this region. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000433901600019 |
WOS关键词 | SOUTHWEST INDIAN RIDGE ; MID-ATLANTIC RIDGE ; CRUSTAL STRUCTURE ; SEISMIC-REFRACTION ; CAYMAN TROUGH ; OCEANIC-CRUST ; GAKKEL RIDGE ; DEPTH ; CONSTRAINTS ; GENERATION |
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/34721 |
专题 | 地球科学 气候变化 |
作者单位 | 1.GEOMAR Helmholtz Ctr Ocean Res, Kiel, Germany; 2.Univ Texas Austin, Inst Geophys, Jackson Sch Geosci, Austin, TX USA; 3.Univ Durham, Dept Earth Sci, Durham, England; 4.Univ Kiel, Inst Geosci, Kiel, Germany |
推荐引用方式 GB/T 7714 | Grevemeyer, Ingo,Hayman, Nicholas W.,Peirce, Christine,et al. Episodic magmatism and serpentinized mantle exhumation at an ultraslow-spreading centre[J]. NATURE GEOSCIENCE,2018,11(6):444-+. |
APA | Grevemeyer, Ingo.,Hayman, Nicholas W..,Peirce, Christine.,Schwardt, Michaela.,Van Avendonk, Harm J. A..,...&Papenberg, Cord.(2018).Episodic magmatism and serpentinized mantle exhumation at an ultraslow-spreading centre.NATURE GEOSCIENCE,11(6),444-+. |
MLA | Grevemeyer, Ingo,et al."Episodic magmatism and serpentinized mantle exhumation at an ultraslow-spreading centre".NATURE GEOSCIENCE 11.6(2018):444-+. |
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