The Goshogake mud volcano field, Tohoku, northern Japan: An acidic, high-temperature system related to magmatic volcanism
The Goshogake mud volcano field, Tohoku, northern Japan: An acidic, high-temperature system related to magmatic volcanism
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日本北部东北部的五所岳泥火山田：与岩浆火山作用有关的酸性高温系统
DOI：
10.1016/j.geomorph.2018.12.035
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
and T. Matsui
中科院分区：
文献类型：
--
作者：
Komatsu;G.;R. Ishimaru;N. Miyake;K. Kawai;M. Kobayashi;H. Sakuma;and T. Matsui
日本北部秋田县的高温（33-98°C）、高酸性（pH2.44-2.94）Goshogake泥火山田是与第四纪安山质复合火山秋田烧山相关的泥火山系统。在五所岳观察到的泥火山特征包括莎莎池、狮鹫和泥盆。这是泥火山系统与岩浆火山活动相关的罕见例子，主要在沉积环境中的低温泥火山活动中观察到各种地貌。五所岳泥火山田很可能不是一个与岩浆火山有关的简单热液系统。相反，它似乎是一个混合系统：沉积火山活动与深层泥浆源有关，并受到周围岩浆火山活动的强烈影响。泥浆取样中鉴定出的矿物种类包括石英族、含水二氧化硅、白云母、高岭石、黄铁矿和硫。矿物学中存在高温二氧化硅多晶型物（鳞石英和方英石）和/或微晶蛋白石（蛋白石-C、蛋白石-CT）和无定形二氧化硅（蛋白石-A），表明泥火山系统可能涉及 Goshogake 泥浆下方某些深度的高温、热液循环、脱水反应等条件和过程。 火山场。尽管泥浆的来源尚未明确确定，但可能的选择包括 1) 主岩和沉积物的热液蚀变产物，2) 深层细粒沉积层，或 3) 1) 和 2) 的组合。对喷口排放气体的现场测量发现了甲烷，它除了是地下压力-温度条件下与二氧化碳热力学平衡的产物外，还可能与富含有机物的沉积层有关。五所岳泥火山中水的 δD 和 δ18O 相对于当前大气水值的增加表明，水不仅来自大气水，而且这些值的偏差可能是由于蒸发和来自更深来源的其他水的混合等过程造成的。关于五所岳泥火山的驱动机制，泥质沉积物的浮力、快速沉积导致的超压或欠压实条件下的高流体压力，以及沉积物中气相的存在，可能是关键因素。尽管五所岳泥火山田目前保持着低水平的活动，导致泥火山地貌的形态变化很小，但在过去的半个世纪中记录了活动的增强。关于地震与五所岳泥火山场活动之间的关系，历史记录尚无定论。
The high-temperature (33–98 °C), highly acidic (pH 2.44–2.94) Goshogake mud volcano field in Akita Prefecture, northern Japan, is a mud volcano system associated with the Quaternary andesitic composite volcano Akita Yakeyama. The mud volcano features observed in Goshogake include salsa ponds, gryphons, and mud pots. This is a rare example of mud volcano systems linked with magmatic volcanism with the full range of landforms observed primarily in low-temperature mud volcanism in sedimentary settings. The Goshogake mud volcano field is probably not a simple hydrothermal system related to a magmatic volcano. Instead, it appears to be a hybrid system: sedimentary volcanism linked with deep mud sources and strongly influenced by its surrounding magmatic volcanism. The identified mineral species in the sampled mud include quartz group, hydrous silica, muscovite, kaolinite, pyrite, and sulfur. The presence of high-temperature silica polymorphs (tridymite and cristobalite) and/or microcrystalline opals (opal-C, opal-CT), and an amorphous form of silica (opal-A) in the mineralogy indicates that the mud volcano system likely involves conditions and processes such as high temperature, hydrothermal circulation, dehydration reaction at certain depths underneath the Goshogake mud volcano field. Although the source of the mud is not clearly determined, possible options include 1) hydrothermal alteration products of host rocks and sediments, 2) fine-grained sedimentary layer(s) at depth, or 3) a combination of 1) and 2). In-situ measurement of emitted gases from vents detected methane, which is possibly linked with the organic-rich sedimentary layer(s) aside from being a product of thermodynamic equilibrium with CO2under the subsurface pressure-temperature conditions. The increases in δD and δ18O of water in Goshogake mud volcanoes with respect to the values of current meteoric water indicates that the water was derived not only from meteoric water, and deviation of the values may be explained by processes such as evaporation and mixing of other waters from deeper sources. Regarding the driving mechanisms at the Goshogake mud volcanoes, buoyancy of muddy sediment, high fluid pressure under overpressured or under-compacted conditions due to rapid sedimentation, together with the presence of a gas phase in the sediment, could be key factors. Although the Goshogake mud volcano field currently maintains a low-level activity resulting in only minor morphological changes of the mud volcano landforms, enhanced activities have been documented in the last half century. The historical records are inconclusive about the relationship between earthquakes and activity in the Goshogake mud volcano field.
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