The silicification of trees in volcanic ash - An experimental study
The silicification of trees in volcanic ash - An experimental study
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DOI：
10.1016/j.gca.2012.01.018
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发表时间：
2012-05-01
影响因子：
5
通讯作者：
Rhede, Dieter
中科院分区：
文献类型：
--
作者：
Ballhaus, Chris;Gee, Carole T.;Rhede, Dieter
通过广泛的硅化作用，即当森林被火山碎屑岩掩埋时，树木的渗透矿化作用是在100摄氏度的封闭系统实验中模拟的。二氧化硅源是研磨的流纹岩黑曜石玻璃。木材样品为松科针叶树种（花旗松、道格拉斯冷杉），从石质基质向木材组织中转运二氧化硅的介质为水。木材与富含二氧化硅的水的反应表明，木材具有显着的亲和力，从水溶液中吸附二氧化硅复合物，并以蛋白石的形式将其沉淀在木材细胞内的有机表面上。扩散和平流模型被用来估计需要多长时间才能使像世界各地的石化森林中发现的那样巨大的原木全矿化。时间尺度是数千年的量级。(c)2012爱思唯尔有限公司保留所有权利。
The permineralization of trees by pervasive silicification, that is, when forests are buried by volcanic pyroclastics, is simulated with closed-system experiments at 100 degrees C. The silica source was a ground rhyolitic obsidian glass. The wood samples were coniferous, (Pseudotsuga menziesii, Douglas fir) from the family Pinaceae, and the medium transporting silica from the lithic matrix into the wood tissue was water. Reaction of wood with silica-enriched water shows that wood has a marked affinity to scavenge silica complexes from an aqueous solution and precipitate them on organic surfaces inside the wood cells in the form of opal. Diffusion and advection models are used to estimate how long it may take to permineralize wood logs as massive as those found in petrified forests worldwide. The time scales are on the order of thousands of years. (c) 2012 Elsevier Ltd. All rights reserved.