Visualizing fossilization using laser ablation-inductively coupled plasma-mass spectrometry maps of trace elements in Late Cretaceous bones
Visualizing fossilization using laser ablation-inductively coupled plasma-mass spectrometry maps of trace elements in Late Cretaceous bones
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DOI：
10.1130/g25551a.1
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发表时间：
2009-06-01
期刊：
影响因子：
5.8
通讯作者：
Trueman, Clive N.
中科院分区：
文献类型：
--
作者：
Koenig, Alan E.;Rogers, Raymond R.;Trueman, Clive N.
激光烧蚀-电感耦合等离子体质谱(LA-ICP-MS)产生的元素图提供了以前无法获得的高分辨率可视化，显示了在成岩和石化的早期阶段个体骨骼内复杂的物理化学条件。从蒙大拿州(美国)和马达加斯加的晚白垩世收集的一组LA-ICPMS骨骼图谱图形化地展示了重结晶的不同路径，并揭示了对挖掘历史的地球化学方面的独特见解。一些骨骼在稀土元素和铀的浓度上表现出明显的梯度，最高浓度出现在外部骨骼边缘。其他的则表现出与骨组织学相关的更复杂的微量元素摄取模式及其对孔隙水流动路径的控制。LA-ICP-MS图谱揭示的元素摄取模式可用于指导采样策略，并质疑先前依赖于大量化石骨组织局部样本的研究。LA-ICPMS图谱还可以比较骨骼化石之间的重结晶速率，并提供了一种新的方法来识别骨骼或骨骼区域，这些骨骼或骨骼区域可能适合提取完整的生物地球化学信号。
Elemental maps generated by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) provide a previously unavailable high-resolution visualization of the complex physicochemical conditions operating within individual bones during the early stages of diagenesis and fossilization. A selection of LA-ICP-MS maps of bones collected from the Late Cretaceous of Montana (United States) and Madagascar graphically illustrate diverse paths to recrystallization, and reveal unique insights into geochemical aspects of taphonomic history. Some bones show distinct gradients in concentrations of rare earth elements and uranium, with highest concentrations at external bone margins. Others exhibit more intricate patterns of trace element uptake related to bone histology and its control on the flow paths of pore waters. Patterns of element uptake as revealed by LA-ICP-MS maps can be used to guide sampling strategies, and call into question previous studies that hinge upon localized bulk samples of fossilized bone tissue. LA-ICP-MS maps also allow for comparison of recrystallization rates among fossil bones, and afford a novel approach to identifying bones or regions of bones potentially suitable for extracting intact biogeochemical signals.