Supplementary Data Table S1 (Excel) to accompany “Petrography, geochemistry, age, and stratigraphic significance of the Mississippian Boyd Creek tuff, southern New Brunswick, Canada” (Park et al., 2024)

This file is the supplementary data that accompanies the publication for which the full citation is given below. The Boyd Creek tuff consists of two pyroclastic flow deposits and more widespread air-fall tuff within a Mississippian red bed sequence located in outcrop and boreholes around Weldon and Pre d’en Haut, Albert and Westmorland counties, New Brunswick. Long recognized as an important stratigraphic marker, it has been placed in either the Tournaisian Weldon Formation or Visean Hillsborough Formation by previous workers, with a position in the upper Tournaisian Weldon Formation being the most recent interpretation. A Visean laser ablation-inductively coupled plasma-mass spectrometry U–Pb zircon age of 336.9 ± 2.0 Ma is consistent with the interpretation that the tuff is part of the Windsor Group and within a fine-grained red and grey sequence of the Hillsborough Formation. Although the tuff is altered and contains abundant xenoliths and xenocrysts, petrography and chemistry are consistent with rhyolite or dacite composition. Its composition and age suggest that the Boyd Creek tuff is one of several volcanic units interpreted to be in the Windsor Group or its temporal equivalents, including rhyolite-trachyte lavas of Cumberland Hill (Cumberland Hill Formation, Mabou Group), tuff in carbonate-evaporite sequence at the Picadilly Mine (Penobsquis), and the red bed Shin Formation (Mabou Group) at Hurley Creek near Minto. Locating and dating other ‘ash beds’ in the Windsor Group offers a way to resolve long-standing issues of correlation in the Visean of New Brunswick and Nova Scotia.本文件为随附本出版物的补充数据，完整引用信息详见下文。博伊德溪凝灰岩（Boyd Creek tuff）由两处火山碎屑流沉积与分布更为广泛的降落凝灰岩组成，赋存于加拿大新不伦瑞克省阿尔伯特县和威斯特摩兰县韦尔登（Weldon）与普雷德昂奥（Pre d’en Haut）周边露头及钻孔中的密西西比纪红层序列内。该凝灰岩长期以来被视作重要的地层标志层，前人研究曾将其归为杜内阶韦尔登组（Tournaisian Weldon Formation）或维宪阶希尔斯伯勒组（Visean Hillsborough Formation），最新学界解释认为其隶属于杜内阶上部的韦尔登组。采用激光剥蚀-电感耦合等离子体质谱法（laser ablation-inductively coupled plasma-mass spectrometry）进行U-Pb锆石定年，所得年龄为336.9 ± 2.0 Ma，对应时代为维宪阶，该结果与“该凝灰岩属于温莎群（Windsor Group）且赋存于希尔斯伯勒组细粒红灰序列”的观点相符。尽管该凝灰岩已发生蚀变且富含捕虏体与捕虏晶，但其岩石学与地球化学特征均符合流纹岩或英安岩的成分属性。结合其成分与年龄特征，博伊德溪凝灰岩可归入温莎群或时代相当地层中的火山岩单元之一，同类火山岩单元还包括坎伯兰山（Cumberland Hill）的流纹岩-粗面岩熔岩（坎伯兰山组，马布群（Mabou Group））、皮卡迪利矿（Penobsquis）碳酸盐-蒸发岩序列中的凝灰岩，以及明托附近赫尔利溪（Hurley Creek）的红层辛组（Shin Formation，马布群）。对温莎群内其他火山灰层的定位与定年工作，可为解决新不伦瑞克省与新斯科舍省维宪阶地层长期存在的对比难题提供有效途径。