Mineralogical and compositional changes in bones exposed on soil surfaces in Amboseli National Park, Kenya: diagenetic mechanisms and the role of sediment pore fluids
Mineralogical and compositional changes in bones exposed on soil surfaces in Amboseli National Park, Kenya: diagenetic mechanisms and the role of sediment pore fluids
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DOI：
10.1016/j.jas.2003.11.003
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发表时间：
2004-06-01
影响因子：
2.8
通讯作者：
Weiner, S
中科院分区：
文献类型：
--
作者：
Trueman, CNG;Behrensmeyer, AK;Weiner, S
暴露在肯尼亚安博塞利国家公园热带萨凡纳草原上的骨骼在40年内经历了广泛的死后变化。一个综合的分析方法，包括TEM显微镜，微量金属分析，FTIR光谱，岩相分析揭示了一个复杂的，动态的成岩环境内暴露的骨骼，驱动土壤水分从骨/土壤界面的蒸发运输到骨的上暴露表面。这一过程导致了广泛的骨/土-水相互作用，并导致了15年内Ba和La等微量元素浓度增加100 -> 1000%。骨微晶的最大和平均尺寸随着持续暴露而增加。这种平均微晶长度的变化与骨结晶度的增加呈正相关，而骨结晶度的增加又与骨蛋白的降解有关。微生物分解很少观察到的Amboseli骨，但在存在导致严重的溶解-再沉淀的骨minerals. Many骨表现出广泛的permineralization较大的血管空间与方解石和重晶石，在较小程度上，crandallite。未埋葬的骨头的矿化可能占95%的减少宏观（微米-毫米级）孔隙度在2年内death.We生产的埋葬前的成岩作用的骨骼和热带环境，突出了广泛的改变骨化学在死后1-40年的模型。(C)2003 Elsevier Ltd.保留所有权利。
Bones exposed on tropical savannah grasslands of Amboseli National Park, Kenya undergo extensive post-mortem alteration within 40 years. A combined analytical approach involving TEM microscopy, trace metal analysis, FTIR spectroscopy, and petrographic analysis has revealed a complex, dynamic diagenetic environment operating within exposed bones, driven by evaporative transport of soil water from the bone/soil interface to the upper exposed surface of the bone. This process results in extensive bone/soil-water interaction, and is responsible for increases in the concentrations of trace elements such as Ba and La of 100 --> 1000% within 15 years. The maximum and mean size of bone crystallites increases with continued exposure. This change in mean crystallite length is correlated positively with increases in bone crystallinity, which in turn is associated with degradation of the bone protein. Microbial decomposition is rarely observed in the Amboseli bones, but where present resulted in severe dissolution-reprecipitation of bone mineral. Many bones showed extensive permineralization of the larger vascular spaces with calcite and barite and, to a lesser extent, crandallite. Permineralization of unburied bones may account for 95% reduction in macro (micron-millimeter scale) porosity in the bone within 2 years of death.We produce a model for pre-burial diagenesis of bone in and tropical environments that highlights extensive alteration of bone chemistry within 1-40 years post-mortem. (C) 2003 Elsevier Ltd. All rights reserved.