Tuyas: a descriptive genetic classification
Tuyas: a descriptive genetic classification
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Tuyas：描述性遗传分类
DOI：
10.1016/j.quascirev.2014.01.001
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发表时间：
2014
影响因子：
4
通讯作者：
C. Ryane
中科院分区：
文献类型：
--
作者：
J. Russell;B. Edwards;L. Porritt;C. Ryane
我们提出了一个描述性的成因分类方案和相应的命名glaciovoltaic大厦在这里定义为火山：正浮雕火山喷发过程中冰禁闭的形态，包括一套反映岩浆和冰/融水之间的直接相互作用的岩相。火山岩内部的岩相组合记录了火山喷发和冰川水力条件之间的相互作用。虽然熔岩的成分可以从玄武岩到流纹岩，但许多冰川火山环境的特征在很大程度上与熔岩成分无关（例如，建筑物形态、柱状节理样式、玻璃分布、火山碎屑形状）。我们的分类巩固了主要在冰岛和加拿大工作的地球科学家的早期，孤立的贡献和命名，随后在过去30年中发展的不同命名。图雅亚型首先是根据建筑规模形态的变化（例如，平顶图雅），然后，在基本岩相的比例上（例如，熔岩为主的平顶图雅），最后是岩浆成分（例如，玄武质、熔岩为主、平顶的图雅）。这些描述性的修改器可能提供额外的遗传信息，我们展示了如何组合的editarian形态和岩相可以直接链接到一般glaciohydraulic条件。我们确定了九个不同的冰川火山模型大厦，可能导致火山作用和冰川水文之间的相互作用。对图雅类型的详细研究对于恢复地质时期的古环境信息至关重要，包括：冰盖位置，范围，厚度和冰川水力学。这种古环境信息是一种新的、创新的、未充分利用的资源，可用于约束全球古气候模型。
We present a descriptive genetic classification scheme and accompanying nomenclature for glaciovolcanic edifices herein defined as tuyas:positive-relief volcanoes having a morphology resulting from ice confinement during eruption and comprising a set of lithofacies reflecting direct interaction between magma and ice/melt water. The combinations of lithofacies within tuyas record the interplay between volcanic eruption and the attending glaciohydraulic conditions. Although tuyas can range in composition from basaltic to rhyolitic, many of the characteristics diagnostic of glaciovolcanic environments are largely independent of lava composition (e.g., edifice morphology, columnar jointing patterns, glass distributions, pyroclast shapes). Our classification consolidates the diverse nomenclature resulting from early, isolated contributions of geoscientists working mainly in Iceland and Canada and the nomenclature that has developed subsequently over the past 30 years. Tuya subtypes are first recognized on the basis of variations in edifice-scale morphologies (e.g., flat-topped tuya) then, on the proportions of the essential lithofacies (e.g., lava-dominated flat-topped tuya), and lastly on magma composition (e.g., basaltic, lava-dominated, flat-topped tuya). These descriptive modifiers potentially supply additional genetic information and we show how the combination of edifice morphologies and lithofacies can be directly linked to general glaciohydraulic conditions. We identify nine distinct glaciovolcanic model edifices that potentially result from the interplay between volcanism and glaciohydrology. Detailed studies of tuya types are critical for recovering paleo-environmental information through geological time, including: ice sheet locations, extents, thicknesses, and glaciohydraulics. Such paleo-environmental information represents a new, innovative, underutilized resource for constraining global paleoclimate models.