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首页> 外文期刊>Journal of Volcanology and Geothermal Research >In-vent column collapse as an alternative model for massive volcaniclastic kimberlite emplacement: An example from the Fox kimberlite, Ekati Diamond Mine, NWT, Canada
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In-vent column collapse as an alternative model for massive volcaniclastic kimberlite emplacement: An example from the Fox kimberlite, Ekati Diamond Mine, NWT, Canada

机译：发明中的柱坍塌作为大规模火山碎屑金伯利岩进位的替代模型：加拿大新罕布什尔州Ekati钻石矿的Fox金伯利岩的一个例子

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摘要

The origins of massive, poorly sorted fragmental kimberlite and kimberlite breccias in the diatremes of kimberlite volcanic pipes is currently poorly understood. Studies of the textural features of the major infill of the Fox kimberlite, Ekati Diamond Mine, NWT, Canada, show that it may have formed as a result of the collapse of the explosive eruption column above the vent into the deep open pipe during the climactic stage of the eruption. As the eruption intensity increased the column became critically overloaded with dense particles and rapidly collapsed onto itself. Unlike deposits typically preserved from column collapse events, such as ignimbrites, some portion of the collapsing mass was trapped in the deep pipe, forming a distinct type of pyroclastic deposit, "in-vent/vent-fill column collapse lapilli-tuff". This deposit has previously been tentatively identified as tuffisitic kimberlite (TK) or massive volcaniclastic kimberlite (MVK), based on broadly similar textural characteristics with these lithologies. Though every individual deposit will have formed under slightly different circumstances, mass emplacement from column collapse is proposed as a viable model for massive volcaniclastic kimberlite emplacement, based on extrapolation of modern volcanological processes.
机译：目前，人们对金伯利岩火山岩管径中碎片状的金伯利岩和金伯利岩角砾岩的起源知之甚少。对加拿大西北省Ekati钻石矿Fox金伯利岩的主要填充物的结构特征的研究表明，它可能是由于高空期间喷口上方的爆炸性喷发柱坍塌而进入深空管道而形成的。喷发阶段。随着喷发强度的增加，色谱柱变得严重地充满了致密的颗粒，并迅速塌陷在其自身上。与通常从柱塌陷事件（例如火成岩）中保留下来的沉积物不同，塌陷物质的一部分被困在深管中，形成了独特的火山碎屑沉积物，即“本底/排气填充柱塌陷lapilli-tuff”。基于与这些岩性大致相似的构造特征，该沉积物先前已被初步确定为凝灰岩金伯利岩（TK）或​​块状火山碎屑金伯利岩（MVK）。尽管每个单独的沉积物都会在略有不同的情况下形成，但根据现代火山学过程的外推，提出了由柱崩塌引起的大体积位移作为大规模火山碎屑金伯利岩位移的可行模型。

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