Contrasting chemical compositions in associated lizardite and chrysotile in veins from Elba, Italy
Contrasting chemical compositions in associated lizardite and chrysotile in veins from Elba, Italy
复制标题
意大利厄尔巴岛矿脉中伴生蜥蜴石和温石棉的化学成分对比
DOI：
10.1127/ejm/9/3/0585
复制
发表时间：
1997
影响因子：
2.1
通讯作者：
M. Mellini
中科院分区：
文献类型：
--
作者：
C. Viti;M. Mellini
在意大利厄尔巴岛的MonteFico采石场中，广泛采集了由伴生的温石棉和结晶良好的蜥蜴石组成的蛇纹石矿脉，这些矿脉大多形成于四面体的蜥蜴石-IT。对样品进行了光学、红外和X射线表征，并用电子显微镜对样品进行了研究。透射电子显微镜为温石棉、多角蛇纹石和蛇纹石的存在提供了证据，显微结构关系表明从绿泥石到多角蛇纹石再到利蛇纹石的连续重结晶。利兹岩中未发现主要断裂构造。化学数据表明，荔枝石[平均成分(mg2.79Fe2+O.O9Fe3+O.O7AlO。O7)Σ=3.02(Sii.9iAlo.O9)Σ=2.OO5(OH)3.9O]和温石棉[平均组成(镁)8oFeo。纳洛。O6)Σ=2.97Si2。OOO5(0H)4]与温石棉相比，系统地富含铝和铁的蜥蜴石。因此，这两种矿物不应再被视为多晶型。
Serpentinitic veins consisting of associated chrysotile and well crystallized lizardite were extensively sampled in the Monte Fico quarries, Elba Island, Italy.The veins are mostly formed ofeuhedral lizardite-IT. After optical, IR and X-ray characterization, the specimens were studied by transmission electron microscopy. TEM provides evidence for the occurrence of chrysotile, poly gonal serpentine and lizardite, with microstructural relations pointing to a continuous recrystallization from chry sotile to polygonal serpentine and to lizardite. No major fault structure occurs in lizardite. Chemical data indicate the existence of a compositional gap between lizardite [mean composition (Mg2. 79Fe2+o. o9 Fe3+o. o7Alo. o7) Σ= 3.02 (Sii. 9iAlo. o9) Σ= 2. oo O5 (OH) 3.9 o] and chrysotile [mean composition (Mg2. 8oFeo. nAlo. o6) Σ= 2.97 Si2. oo O5 (0H) 4] with lizardite systematically enriched in aluminum and iron with respect to chrysotile. Therefore, the two minerals should no longer be considered as polymorphs.