A new partial substitution mechanism of CO32−/CO3OH3− and SiO44− for the PO43− group in hydroxyapatite from the Kaiserstuhl alkaline complex (SW-Germany)
A new partial substitution mechanism of CO32−/CO3OH3− and SiO44− for the PO43− group in hydroxyapatite from the Kaiserstuhl alkaline complex (SW-Germany)
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一种新的 CO32−/CO3OH3− 和 SiO44− 部分取代凯泽斯图尔碱性络合物羟基磷灰石中 PO43− 基团的机制（SW-德国）
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发表时间：
1985
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通讯作者：
K. Katz
中科院分区：
文献类型：
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作者：
J. Sommerauer;K. Katz
通过对凯泽斯图尔第三纪碱性火山中心一系列碳酸盐岩及伴生硅酸盐火山岩中磷灰石的矿物化学研究，发现羟基磷灰石中存在一种新的取代机制，其简化公式为：(CA，SR，LREE)10(SiO4)x(CO3)x(PO4)6−2x(OH，F)2，0<；x<；1.2LREE代表轻稀土元素Ce，La，Nd。检测到的其他元素包括氯、S和微量的镁、铝、钾、铁、锰和钍，但它们对所发现的取代机理没有影响。F以不同的数量存在，尽管远低于总可能卤素含量的一半(3.7wt.%F)，并与REE和Si(反过来与C)显示出明显的对抗性浓度相关性。一般情况下，电荷平衡是通过CO32−和SiO44−对PO43−的偶合取代来维持的，但过量电荷可能随后被CO3OH3−部分伴随着Ca位中的稀土元素所调节。
Based on a detailed mineral-chemical investigation of apatite from a series of carbonatites and associated silicate volcanic rocks of the Kaiserstuhl tertiary alkaline volcanic centre, evidence for a new substitution mechanism was found within the hydroxyapatite group, yielding the following simplified formula: (Ca, Sr, LREE)10(SiO4)x(CO3)x(PO4)6−2x(OH, F)2 with 0<x<1.2 LREE represents light rare-earth elements such as Ce, La, and Nd. Other elements were detected included Cl, S and traces of Mg, Al, K, Fe, Mn, and Th, however they have no effect on the substitution mechanism found. F is present in varying amounts, although well under half of the total possible halogen content (3.7 wt.% F), and shows a distinct antipathetic concentration correlation with REE and Si (and in turn with C). Charge balance is generally maintained by the coupled substitution of CO32−and SiO44−for PO43−; however, excess charge may be subsequently adjusted by CO3OH3− partly accompanied by the REE in the Ca site.