Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021GL092570 |
Are xenoliths from southwestern Kaapvaal Craton representative of the broader mantle? Constraints from magnetotelluric modeling | |
Sinan Ö; zaydı; n; Kate Selway; William L. Griffin | |
2021-05-20 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2021 |
英文摘要 | Most of our knowledge of the composition and water content of the cratonic mantle comes from xenoliths found in alkaline magmatic rocks (e.g., kimberlites). However, it is debatable whether such mantle-xenolith samples are representative of the mantle over larger lateral extents or only represent more local metasomatised conduits. To investigate this, we made 3D deterministic and 1D probabilistic models of magnetotelluric data from the southwestern Kaapvaal Craton and carried out quantitative interpretations. The results indicate that water content decreases with depth between 100 and 160 km, broadly matching the distribution of metasomatism inferred from garnet-xenocrysts. Spatially pervasive phlogopite could exist for a colder geotherm (37 mW/m2) whereas it is not required for the more likely geotherm of 40.2 mW/m2. Most water contents measured from xenolith samples agree with those calculated from the MT models within error, but the discrepancies between them suggest a local metasomatic control over xenolith water contents. |
领域 | 气候变化 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/328705 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Sinan Ö,zaydı,n,et al. Are xenoliths from southwestern Kaapvaal Craton representative of the broader mantle? Constraints from magnetotelluric modeling[J]. Geophysical Research Letters,2021. |
APA | Sinan Ö,zaydı,n,Kate Selway,&William L. Griffin.(2021).Are xenoliths from southwestern Kaapvaal Craton representative of the broader mantle? Constraints from magnetotelluric modeling.Geophysical Research Letters. |
MLA | Sinan Ö,et al."Are xenoliths from southwestern Kaapvaal Craton representative of the broader mantle? Constraints from magnetotelluric modeling".Geophysical Research Letters (2021). |
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