Long-lived stratovolcanoes display a thick volcanic apron surrounding the edifice. This sedimentary succession incorporates the majority of the deposits from both growth and destruction phases of a volcanic massif. The ring plain of Taranaki Volcano (>200 ka) is composed of volcaniclastic mass-flow deposits that are exceptionally well-exposed along its coastal-cliff shoreline, at 20 to 30 km distance from the edifice. Overall, the volcaniclastic deposits in the southern and south-western sector record three growth phases (65 to 34 ka) which can be investigated due to access and stratigraphic control of the ring-plain section. Each cyclic growth phase is represented by a sequence of mass-flow deposits. Lithostratigraphic units or repeated packages with similar properties were identified in order to understand the depositional sequences. The mass-flow units within these growth phases can be described by three criteria subdivided into nine distinct sedimentological textural types (for example, massive, graded, etc.), five different lithological types (for example, lithic-dominated, polylithological, etc.) and three main physiographic facies types (sheet, overbank and channel). The mass-flow deposits can then be further categorized through a classification scheme by assigning these three criteria. Widely distributed lithic-dominated hyperconcentrated-flow deposits were recognized, which are thought to be directly or indirectly associated with eruption-fed events (remobilized from 'block and ash' flows) providing evidence for eruptive activity occurring on a 4 to 10 kyr cycle. Therefore, this study proposes classification criteria for mass-flow deposits in volcanic ring-plains using a developed three-part coding system. The study also aims to clarify the order of sedimentary and volcanic events by establishing a stratigraphic model for the investigated time-period offering a better understanding for future research.

中文翻译：

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从火山碎屑质量流沉积物阐明成层火山构造：新西兰塔拉纳基火山的中部环形平原

长寿命的成层火山在建筑物周围显示出厚厚的火山围裙。这种沉积序列包含了来自火山地块生长和破坏阶段的大部分沉积物。塔拉纳基火山的环形平原 (>200 ka) 由火山碎屑质量流沉积物组成，这些沉积物沿海岸悬崖海岸线非常暴露，距离建筑物 20 至 30 公里。总体而言，南部和西南部的火山碎屑沉积物记录了三个生长阶段（65 至 34 ka），由于环形平原剖面的进入和地层控制，可以对其进行调查。每个循环生长期由一系列质量流沉积物表示。为了了解沉积序列，确定了具有相似特性的岩石地层单元或重复组合。这些生长阶段内的质量流单元可以用三个标准来描述，这些标准细分为九种不同的沉积结构类型（例如，块状、分级等）、五种不同的岩性类型（例如，岩性为主、多岩性等）。 ) 和三种主要的地貌相类型（片状、堤岸和河道）。然后可以通过分配这三个标准通过分类方案对质量流量沉积物进行进一步分类。广泛分布的以岩屑为主的超浓流沉积物被确认，这被认为与喷发事件（从“块状和灰烬”流中重新动员）直接或间接相关，为发生在 4 到 10 kyr 循环中的喷发活动提供了证据。所以，本研究提出了使用开发的三部分编码系统对火山环平原中的质量流沉积物进行分类的标准。该研究还旨在通过为调查时间段建立地层模型来澄清沉积和火山事件的顺序，为未来的研究提供更好的理解。