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DOI | 10.1038/s41561-018-0139-z |
Thermal effects of pyroxenites on mantle melting below mid-ocean ridges | |
Brunelli, Daniele1,2; Cipriani, Anna1,3; Bonatti, Enrico2,3 | |
2018-07-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:7页码:520-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Italy; USA |
英文摘要 | After travelling in Earth's interior for up to billions of years, recycled material once injected at subduction zones can reach a subridge melting region as pyroxenite dispersed in the host peridotitic mantle. Here we study genetically related crustal basalts and mantle peridotites sampled along an uplifted lithospheric section created at a segment of the Mid-Atlantic Ridge through a time interval of 26 million years. The arrival of low-solidus material into the melting region forces the elemental and isotopic imprint of the residual peridotites and of the basalts to diverge with time. We show that a pyroxenite-bearing source entering the subridge melting region induces undercooling of the host peridotitic mantle, due to subtraction of latent heat by melting of the low-T-solidus pyroxenite. Mantle undercooling, in turn, lowers the thermal boundary layer, leading to a deeper cessation of melting. A consequence is to decrease the total amount of extracted melt, and hence the magmatic crustal thickness. The degree of melting undergone by a homogeneous peridotitic mantle is higher than the degree of melting of the same peridotite but veined by pyroxenites. This effect, thermodynamically predicted for a marble-cake-type peridotite-pyroxenite mixed source, implies incomplete homogenization of recycled material in the convective mantle. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438794800016 |
WOS关键词 | SOUTHWEST INDIAN RIDGE ; MID-ATLANTIC RIDGE ; HETEROGENEOUS MANTLE ; ABYSSAL PERIDOTITES ; EXTRACTION ; CONSEQUENCES ; BENEATH ; MORB ; DISEQUILIBRIUM ; CONSTRAINTS |
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/35029 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Modena & Reggio Emilia, Dipartimento Sci Chim & Geol, Modena, Italy; 2.CNR, Ist Sci Marine, Bologna, Italy; 3.Columbia Univ, Lamont Doherty Earth Observ, New York, NY 10027 USA |
推荐引用方式 GB/T 7714 | Brunelli, Daniele,Cipriani, Anna,Bonatti, Enrico. Thermal effects of pyroxenites on mantle melting below mid-ocean ridges[J]. NATURE GEOSCIENCE,2018,11(7):520-+. |
APA | Brunelli, Daniele,Cipriani, Anna,&Bonatti, Enrico.(2018).Thermal effects of pyroxenites on mantle melting below mid-ocean ridges.NATURE GEOSCIENCE,11(7),520-+. |
MLA | Brunelli, Daniele,et al."Thermal effects of pyroxenites on mantle melting below mid-ocean ridges".NATURE GEOSCIENCE 11.7(2018):520-+. |
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