光散射学报, 2008, 20 (1): 72, 网络出版: 2014-01-21  

SXRF分析恐龙脊椎头化石微量元素

Mapping Trace Metals of Dinosaur Backbone Head Fossils Using Synchrotron and Micro-X-ray Fluorescence (SXRF)
作者单位
1 云南省楚雄师范学院物理与电子科学系, 楚雄 675000
2 National Synchrotron Light Source Brookhaven National Laboratory, New York, 11973, USA
摘要
利用同步辐射X射线荧光成像方法(SXRF)检测了二件不同地区的脊椎头恐龙化石, 在每件化石截面上的二个不同区域分别获取了8种元素的分布图及其荧光光谱。在两件样品靠外层的骨密质部位, 发现有较密集的稀土元素Y(钇)。在姜驿恐龙化石中Y的富集, 来自于化石的成岩过程, 在元素分布图中与稀土元素Y共生的含Ca化合物是氟磷酸钙。武定田心恐龙脊椎头化石中, 在稀土元素钇的富集的区域, 其它元素包括Ca的含量均特别少。此种稀土元素的富集可能是由于化石中含有分解不完全的有机物的吸附所致。在姜驿恐龙脊椎头化石中, 微量元素Mn、Fe和Al属于共生矿物; As、Sr、Y元素集中分布在化石的外边缘处, 也是三者共生。在田心恐龙脊椎头化石中, 微量元素Mn、Fe和Al属于共生矿物, Sr、Y元素共生, Cu元素的分布相对集中。研究表明, 恐龙化石中矿物的元素含量及其分布与骨骼所属的部位无关, 只与源地有关。恐龙化石中稀土钇富集的地方, 呈现白色。 同步辐射X射线荧光探测法, 能原位、快速、无损地检测出化石样品各种元素的荧光光谱, 给出恐龙化石元素分布的二维信息, 对于分析恐龙化石所蕴含的侏罗纪时期的古地质特征和古生物信息, 给出了重要的依据。
Abstract
Synchrotron micro-x-ray fluorescence Mapping (SXRF) techniques have been used to help detect two dinosaus’ fossils of head backbone from different regions. Mapping and fluorescence spectrum of eight metal elements have been obtained on two spots of each fossil, one on the edge, and one at the center. Very dense Strontium (Sr) and Yttrium (Y) have been found at edge parts of fossils. The dense element Y was most likely formed from fossils lithification. The calcic compounds with Y element are Ca5F(PO4)3 for the Jiangyi fossil. When element Y are very dense somewhere, Ca element and other metal elements were few. It is possible that Y element has been absorbed by organic compounds which didn’t decompose. The trace elements Mn、Fe and As accrete together. The same situations are As、Sr and Y elements, which were located at the near edge on fossil section. For Tianxin fossil, Mn 、Fe and As elements accrete together. And Sr and Y accrete together. And Cu element is dense. This research proved that metal elements and mapping at dinosaur fossils relate litter with where the bone located on the body, but more relate with surrounding region of fossils. White has been show on the dense Y element place of fossils. By using Synchrotron light source x-ray fluorescence, the mapping and fluorescence spectrum of eight elements on each place of samples can acquire simultaneously. These experimental results are significant valuable for researches related to ancient time’s geology and paleontontology.

杨群, 王怡林, J.M.Ablett. SXRF分析恐龙脊椎头化石微量元素[J]. 光散射学报, 2008, 20(1): 72. YANG Qun, WANG Yi-lin, J.M.Ablett. Mapping Trace Metals of Dinosaur Backbone Head Fossils Using Synchrotron and Micro-X-ray Fluorescence (SXRF)[J]. The Journal of Light Scattering, 2008, 20(1): 72.

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