Nomenclature of the amphibole supergroup
Nomenclature of the amphibole supergroup
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DOI：
10.2138/am.2012.4276
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发表时间：
2012-11-01
影响因子：
3.1
通讯作者：
Welch, Mark D.
中科院分区：
文献类型：
--
作者：
Hawthorne, Frank C.;Oberti, Roberta;Welch, Mark D.
本文提出了一种新的角闪石超族矿物分类和命名方案，它以AB（2）C（5）T（8）O（22）W（2）为基础，其中A =正方形，Na，K，Ca，Pb，Li; B = Na，Ca，Mn ~（2+），Fe ~（2+），Mg，Li; C = Mg，Fe ~（2+），Mn ~（2+），Al，Fe ~（3+），Mn ~（3+），Ti ~（4+），Li; T = Si，Al，Ti ~（4+），Be; W =（OH），F，Cl，O2-。角闪石结构中各位点（或位点群）形式电荷的不同排列保证了不同的根名，并且通过暗示，是不同的物种;对于特定的根名，不同的同价阳离子（例如，Mg对Fe）或阴离子（例如，OH相对于Fe 2+）由前缀（例如，铁-、氟-）。该分类基于A、B和C组阳离子和W组阴离子，因为这些组在角闪石结构中显示出最大的成分变异性。角闪石超群根据W的优势物种可分为两类：（w）（OH，F，Cl）-优势角闪石和O-w-优势角闪石（氧代角闪石）。根据优势电荷排列和B族阳离子类型，将W位以（OH，F，Cl）为主的角闪石分为镁铁锰角闪石、钙角闪石、钠钙角闪石、钠角闪石、锂角闪石、钠（镁铁锰）角闪石、锂（镁铁锰）角闪石和锂钙角闪石8个亚类。在这些亚组中的每一个中，A-和C-组阳离子用于为特定的组成范围和根组成指定特定的名称。根的名称被分配到不同的安排，正式的电荷在网站上，和前缀被分配到描述的同价变化的优势离子的根组成。对于角闪石与O占主导地位的W，不同的根组合物是目前已知的四个（钙和钠）角闪石，并在占主导地位的阳离子的同价变化处理（W）（OH，F，Cl）-占主导地位的角闪石。通过这种分类，我们试图认识到对角闪石感兴趣的每个组成社区的关注，并将这些纳入这个分类方案。在这些关切相互冲突的地方，我们试图根据每个社区更重要的关切采取雅阁行动。
A new classification and nomenclature scheme for the amphibole-supergroup minerals is described, based on the general formula AB(2)C(5)T(8)O(22)W(2), where A = square, Na, K, Ca, Pb, Li; B = Na, Ca, Mn2+, Fe2+, Mg, Li; C = Mg, Fe2+, Mn2+, Al, Fe3+, Mn3+, Ti4+, Li; T = Si, Al, Ti4+, Be; W = (OH), F, Cl, O2-. Distinct arrangements of formal charges at the sites (or groups of sites) in the amphibole structure warrant distinct root names, and are, by implication, distinct species; for a specific root name, different homovalent cations (e.g., Mg vs. Fe) or anions (e.g., OH vs. Fe2+) are indicated by prefixes (e.g., ferro-, fluoro-). The Classification is based on the A, B, and C groups of cations and the W group of anions, as these groups show the maximum compositional variability in the amphibole structure. The amphibole supergroup is divided into two groups according to the dominant W species: (w)(OH,F,Cl)-dominant amphiboles and O-w-dominant amphiboles (oxo-amphiboles). Amphiboles with (OH, F, Cl) dominant at W are divided into eight subgroups according to the dominant charge-arrangements and type of B-group cations: magnesium-iron-manganese amphiboles, calcium amphiboles, sodium-calcium amphiboles, sodium amphiboles, lithium amphiboles, sodium-(magnesium-iron-manganese) amphiboles, lithium-(magnesium-iron-manganese) amphiboles and lithium-calcium amphiboles. Within each of these subgroups, the A- and C-group cations are used to assign specific names to specific compositional ranges and root compositions. Root names are assigned to distinct arrangements of formal charges at the sites, and prefixes are assigned to describe homovalent variation in the dominant ion of the root composition. For amphiboles with O dominant at W, distinct root-compositions are currently known for four (calcium and sodium) amphiboles, and homovalent variation in the dominant cation is handled as for the (w)(OH,F,Cl)-dominant amphiboles. With this classification, we attempt to recognize the concerns of each constituent community interested in amphiboles and incorporate these into this classification scheme. Where such concerns conflict, we have attempted to act in accord with the more important concerns of each community.