Weathering and precipitation after meteorite impact of Ni, Cr, Fe, Ca and Mn in K-T boundary clays from Stevns Klint
Weathering and precipitation after meteorite impact of Ni, Cr, Fe, Ca and Mn in K-T boundary clays from Stevns Klint
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Stevns Klint K-T 边界粘土中 Ni、Cr、Fe、Ca 和 Mn 陨石撞击后的风化和降水
DOI：
10.1088/1742-6596/712/1/012097
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Kazumasa Sugiyama
中科院分区：
文献类型：
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作者：
Yumiko Miyano;Akira Yoshiasa;Tsubasa Tobase;Hiroshi Isobe;Hidetomo Hongu; Maki Okube;Akihiko Nakatsuka;Kazumasa Sugiyama
Ni、Cr、Fe、Ca 和 Mn K 边缘 XANES 和 EXAFS 光谱是在丹麦 Stevns Klint 的 KT 边界粘土上测量的。根据XANES谱和EXAFS分析，KT边界粘土中Ni、Cr和Fe的局部结构分别类似于Ni(OH) 2 、Cr 2 O 3 和FeOOH。据推测，由于地球表面的风化和成岩作用，与撞击相关的玻璃中的镍、铬和铁元素正在转变为稳定的水合物和氧化物。 KT边界粘土中的Ca保持透辉石状结构。 KT 粘土中 Ca 的局部结构似乎保留了陨石撞击时的状况信息。 Mn具有类似于二价态MnCO3的局域结构。推测KT粘土中Fe族元素中Mn丰度较低的原因是生命活动的消耗和向其他部位的扩散。
Ni, Cr, Fe, Ca and Mn K-edge XANES and EXAFS spectra were measured on KT boundary clays from Stevns Klint in Denmark. According to XANES spectra and EXAFS analyses, the local structures of Ni, Cr and Fe in KT boundary clays is similar to Ni (OH) 2, Cr 2 O 3 and FeOOH, respectively. It is assumed that the Ni, Cr and Fe elements in impact related glasses is changing into stable hydrate and oxide by the weathering and diagenesis at the surface of the Earth. Ca in KT boundary clays maintains the diopside-like structure. Local structure of Ca in KT clays seems to keep information on the condition at meteorite impact. Mn has a local structure like MnCO3 with divalent state. It is assumed that the origin on low abundant of Mn in the Fe-group element in KT clays was the consumption by life activity and the diffusion to other parts.