Evidence in the Japan Sea of microdolomite mineralization within gas hydrate microbiomes
Evidence in the Japan Sea of microdolomite mineralization within gas hydrate microbiomes
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DOI：
10.1038/s41598-020-58723-y
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发表时间：
2020-02
影响因子：
4.6
通讯作者：
G. Snyder;R. Matsumoto;Yohey Suzuki;M. Kouduka;Yoshihiro Kakizaki;Naizhong Zhang;H. Tomaru;Y. Sano;N. Takahata;Kentaro Tanaka;S. Bowden;T. Imajo
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文献类型：
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作者：
G. Snyder;R. Matsumoto;Yohey Suzuki;M. Kouduka;Yoshihiro Kakizaki;Naizhong Zhang;H. Tomaru;Y. Sano;N. Takahata;Kentaro Tanaka;S. Bowden;T. Imajo
在过去的15年里，日本海上越盆地的块状天然气水合物沉积得到了广泛的研究，在那里，它们主要与活动的气烟囱构造有关。我们的研究记录了在这些块状天然气水合物中发现的与其他杂质有关的球状微白云石聚集体的发现。微白云石通常是连在一起的，显示出黑色的内核，偶尔含有含盐流体包裹体。拟杆菌属集中在微白云石颗粒的内缘，在那里它们降解黄色甲烷水合物中作为杂质存在的复杂石油大分子。这些石油显示出随着深度的增加生物降解，这与Bacteroidetes的微生物活性一致。进一步调查这些microcrystalites和它们的内容可能会产生洞察力的动态和微生物生态的其他水合物的地方。如果发现微藻化石在现在和化石水合物环境中确实无处不在，那么保存在其中的材料可能会为一个曾经孕育过古代生命的不寻常的微生境提供有价值的见解。
Over the past 15 years, massive gas hydrate deposits have been studied extensively in Joetsu Basin, Japan Sea, where they are associated primarily with active gas chimney structures. Our research documents the discovery of spheroidal microdolomite aggregates found in association with other impurities inside of these massive gas hydrates. The microdolomites are often conjoined and show dark internal cores occasionally hosting saline fluid inclusions.Bacteroidetes sp. are concentrated on the inner rims of microdolomite grains, where they degrade complex petroleum-macromolecules present as an impurity within yellow methane hydrate. These oils show increasing biodegradation with depth which is consistent with the microbial activity ofBacteroidetes. Further investigation of these microdolomites and their contents can potentially yield insight into the dynamics and microbial ecology of other hydrate localities. If microdolomites are indeed found to be ubiquitous in both present and fossil hydrate settings, the materials preserved within may provide valuable insights into an unusual microhabitat which could have once fostered ancient life.