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Magmaclasts in kimberlite
Lithos ( IF 3.5 ) Pub Date : 2021-04-30 , DOI: 10.1016/j.lithos.2021.106197
Kimberley Webb , Casey Hetman

This contribution presents an updated descriptive scheme for magmaclasts in kimberlite, resulting from over 40 combined years of mapping, logging, and petrographic studies by the authors of hundreds of kimberlites and related rocks globally. Systematic description of the essential characteristics of magmaclasts enables their identification, classification and interpretation. Magmaclasts are fluidal-shaped bodies of kimberlite magma (now solidified) formed by any process of magma disruption prior to solidification. The key characteristics used to discriminate the two main varieties, melt segregations and melt-bearing pyroclasts, are explained and illustrated, as well as the features of melt-bearing pyroclasts in the two main classes of pyroclastic kimberlite. Accurate classification of magmaclasts in coherent and volcaniclastic kimberlites is fundamental for the development of valid geological models in support of exploration, evaluation and mine planning. Magmaclasts are used to determine parental magma type, the textural-genetic classification of the infills of kimberlite bodies, the presence of different eruptive phases (and mixing between them), and the emplacement history of a kimberlite. They can also provide insight on potential modification of the inherent diamond distribution of a kimberlite.



中文翻译:

金伯利岩中的Magmaclasts

这一贡献为金伯利岩中的岩浆岩提供了一个更新的描述方案,这是由全球数百个金伯利岩和相关岩石的作者进行了40多年的制图,测井和岩石学研究相结合而得出的。通过对macmaclasts基本特征的系统描述,可以对其进行识别,分类和解释。岩浆弹剂是金伯利岩岩浆(现已凝固)的流体状体,通过凝固前的任何岩浆破坏过程形成。解释和说明了区分两个主要变种的主要特征,即熔体偏析和含熔解热破石,以及两类主要的碎屑金伯利岩中含熔解热破石的特征。在相干和火山碎屑的金伯利岩中准确地对岩浆碎屑进行分类是开发有效的地质模型以支持勘探,评估和矿山规划的基础。岩浆弹剂用于确定父母岩浆类型,金伯利岩体填充物的构造遗传分类,不同喷发相的存在(以及它们之间的混合)以及金伯利岩的沉积史。他们还可以提供有关金伯利岩固有金刚石分布潜在变化的见解。以及金伯利岩的进驻历史。他们还可以提供有关金伯利岩固有金刚石分布潜在变化的见解。以及金伯利岩的进驻历史。他们还可以提供有关金伯利岩固有金刚石分布潜在变化的见解。

更新日期:2021-05-25
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