New silica clathrate minerals that are isostructural with natural gas hydrates
New silica clathrate minerals that are isostructural with natural gas hydrates
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DOI：
10.1038/ncomms1196
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发表时间：
2011-02-01
影响因子：
16.6
通讯作者：
Kudoh, Yasuhiro
中科院分区：
文献类型：
--
作者：
Momma, Koichi;Ikeda, Takuji;Kudoh, Yasuhiro
硅笼状化合物(笼状)和笼状水合物在结构上是相似的，因为这两种材料都具有框架结构，笼状空隙被客体物种占据。笼状水合物在自然界中有以下三种结构类型：立方结构I(Si)、立方结构II(Sii)和六方结构H(Sh)。相比之下，到目前为止，只发现了一种天然存在的硅笼状矿物--黑金云母(硅型骨架)。在这里，我们发现了两种新的硅笼状矿物，它们与SiI和Sh水合物同构，含有碳氢化合物气体。地质和矿物学观察表明，这些硅笼状矿物是汇聚板块边缘低温热液系统的遗迹，是天然气水合物的热源。鉴于海底碳氢化合物渗漏的广泛存在，硅笼状矿物很可能存在于广泛的海洋沉积物中。
Silica clathrate compounds (clathrasils) and clathrate hydrates are structurally analogous because both materials have framework structures with cage-like voids occupied by guest species. The following three structural types of clathrate hydrates are recognized in nature: cubic structure I (sI); cubic structure II (sII); and hexagonal structure H (sH). In contrast, only one naturally occurring silica clathrate mineral, melanophlogite (sI-type framework), has been found to date. Here, we report the discovery of two new silica clathrate minerals that are isostructural with sII and sH hydrates and contain hydrocarbon gases. Geological and mineralogical observations show that these silica clathrate minerals are traces of low-temperature hydrothermal systems at convergent plate margins, which are the sources of thermogenic natural gas hydrates. Given the widespread occurrence of submarine hydrocarbon seeps, silica clathrate minerals are likely to be found in a wide range of marine sediments.