Crystal clustering in magmas: Insights from HP–HT experiments

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Laurent Arbaret , Misha Bystricky , Patrick Launeau
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引用次数: 2

Abstract

We have studied by high-resolution X-ray Computed Tomography the effect of crystal clustering on the Shape-Preferred Orientation (SPO) development in synthetic magmas experimentally deformed at 300 MPa and 475–550°C. A fully connected solid network that could potentially induce the onset of yield strength is not achieved in these suspensions containing 16 vol% of crystals. The alumina grain population exhibits a glomeroporphyritic texture made of isolated grains (59.6%) and clusters of touching grains (40.4%). The SPO of the sub-population of isolated grains exhibits foliation and lineation, which are closely parallel to the plane and direction of shear, respectively. The SPO of clustered grains has little influence overall shape fabric. The angular relationships between the average foliation and cluster elongation provide a good indicator of the shear sense. Finally, we highlight the strain partitioning between nearly non-deformed large clusters acting as rigid glomerocrysts and highly sheared zones in low concentrated suspensions.

岩浆中的晶体聚类:来自高温高温实验的见解
利用高分辨率x射线计算机断层扫描技术,研究了在300 MPa和475 ~ 550℃条件下实验变形的合成岩浆中,晶体聚类对SPO发育的影响。在这些含有16 vol%晶体的悬浮液中,没有实现可能诱导屈服强度开始的完全连接的固体网络。氧化铝晶粒群呈现出由孤立的晶粒(59.6%)和密集的晶粒(40.4%)组成的球状卟卟结构。分离粒亚群的SPO表现为叶理和线理,分别与剪切面和剪切方向密切平行。簇状晶粒的SPO对织物的整体形状影响不大。平均叶理和簇伸长之间的角关系提供了剪切感的良好指标。最后,我们强调了几乎没有变形的大团簇之间的应变分配,作为刚性肾小球和低浓度悬浮液中的高度剪切区。
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来源期刊
Comptes Rendus Geoscience
Comptes Rendus Geoscience 地学-地球科学综合
CiteScore
2.80
自引率
14.30%
发文量
68
审稿时长
5.9 weeks
期刊介绍: Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.
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