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首页> 外文期刊>Geosciences >Mineralogy of Paleocene Petrified Wood from Cherokee Ranch Fossil Forest, Central Colorado, USA
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Mineralogy of Paleocene Petrified Wood from Cherokee Ranch Fossil Forest, Central Colorado, USA

机译：美国科罗拉多州中部切诺基牧场化石森林中的古新世石化木材矿物学

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An extensive fossil forest discovered in 2010 on private property in central Colorado, USA, has not previously been described in scientific literature. Horizontal partial logs originated as fluvially transported driftwood. A preliminary study of petrified wood specimens reveals evidence of a complex mineralization sequence that involved multiple episodes of mineral deposition, combined with diagenetic transformation of silica minerals. Specimens from two logs have opalized cell walls. However, minerals filling the cell interiors of these specimens vary. Vessel lumina are filled with chalcedony or crystalline quartz; tracheid lumina may contain opal or chalcedony. Specimens from 5 other logs contain quartz/chalcedony, but relict textures suggest cell walls were originally mineralized with opal that was later converted to microcrystalline silica. Pyrite, calcite, and iron oxides were observed as minor constituents in some specimens, providing additional evidence that fossilization occurred in multiple stages, with temporal and spatial variations in physical and chemical conditions causing episodic precipitation of various minerals within the buried wood. Trace element analyses suggest that Fe is the main source of fossil wood color.
机译：科学文献以前没有描述过2010年在美国科罗拉多州中部的私有财产上发现的广阔化石森林。水平部分原木起源于河流运输的浮木。硅化木标本的初步研究揭示了一个复杂的矿化序列的证据，该序列涉及多个矿物沉积事件，并伴有二氧化硅矿物的成岩转化。来自两个原木的标本具有乳白色的细胞壁。但是，填充这些标本细胞内部的矿物质各不相同。容器内装满玉髓或晶体石英。管胞管腔可能含有蛋白石或玉髓。来自其他5个原木的标本包含石英/玉髓，但遗迹纹理表明，细胞壁最初是用蛋白石矿化的，后来被转变为微晶硅石。在一些标本中观察到黄铁矿，方解石和氧化铁为次要成分，这提供了进一步的证据，表明化石发生在多个阶段，物理和化学条件的时空变化导致埋木内部各种矿物的周期性沉淀。微量元素分析表明，铁是化石颜色的主要来源。

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