Deciphering Silicification Pathways of Fossil Forests: Case Studies from the Late Paleozoic of Central Europe
Deciphering Silicification Pathways of Fossil Forests: Case Studies from the Late Paleozoic of Central Europe
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DOI：
10.3390/min8100432
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发表时间：
2018-10
期刊：
影响因子：
2.5
通讯作者：
Steffen Trümper;R. Roessler;J. Götze
中科院分区：
文献类型：
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作者：
Steffen Trümper;R. Roessler;J. Götze
研究了中欧5个晚古生代盆地硅化木的产状和形成过程。通过实地观察、地貌学测定以及矿物学分析（偏光显微镜、阴极发光显微镜和光谱学），研究了不同地质环境下的化石木材。结果表明，在不同的物理化学条件下，硅化既可以是单相过程，也可以是多相过程。特别是，CL研究揭示了二氧化硅积累和结晶的复杂过程。硅化木材中石英相的CL特征主要与蓝色（390和440 nm）、黄色（580 nm）和红色（650 nm）发射带有关，这些发射带可能以不同的组合和不同的强度比出现。黄色CL是典型的初始硅化，反映了有机质初始衰变引起的缺氧条件下的快速沉淀。蓝色CL主要是次生成因，是由次生热液石英生成或随后的木材硅化取代前驱相造成的。红色CL可能与晶格缺陷（非桥接氧空穴中心- nbohc）有关。
The occurrence and formation of silicified wood from five late Paleozoic basins in Central Europe was investigated. Fossil wood from diverse geological settings was studied using field observations, taphonomic determinations as well as mineralogical analyses (polarizing microscopy, cathodoluminescence (CL) microscopy and spectroscopy). The results indicate that silicification is either a monophase or multiphase process under varying physico-chemical conditions. In particular, CL studies revealed complex processes of silica accumulation and crystallization. The CL characteristics of quartz phases in silicified wood can mostly be related to blue (390 and 440 nm), yellow (580 nm), and red (650 nm) emission bands, which may appear in different combinations and varying intensity ratios. Yellow CL is typical for initial silicification, reflecting quick precipitation under oxygen-deficient conditions caused by initial decay of the organic material. Blue CL is predominantly of secondary origin, resulting from replacement of precursor phases by a secondary hydrothermal quartz generation or subsequent silicification of wood. The red CL can be related to a lattice defect (non-bridging oxygen hole center—NBOHC).