浙江渡船头“伊利石”应属绢云母
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The Argument that the Duchuantou "Illite" of Zhejiang Province Is Actually Sericite
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    摘要:

    渡船头云母状矿物长期以来被称为“伊利石”,近期经过X射线衍射(XRD)、红外光谱(IR)、差热分析(DTA)、电子显微镜(EM)观察及化学组成等研究后显示:这种呈薄鳞片状、粒度很细(一般小于5μm)、结晶度高的矿物,其d(002)=9.95A,为2M多型,出现特征的3625cm(-1)、3450cm(-1)、1020cm(-1)、935cm(-1)、825cm(-1)、799cm(-1)、755cm(-1)、543cm(-1)、480cm(-1)红外吸收和40—70℃、106.4—111.2℃两弱吸热谷及630—670℃强吸热谷;矿物MgO小于0.25%,结构中八面体Mg(2+)量小于0.03,以Al(3+)和Fe(3+)为主,八面体电荷为-0.052—+0.048/O(10)(OH)2,K2O一般大于9%。上述这些均表明,渡船头“伊利石”应属绢云母。

    Abstract:

    Mineraiogical studies of; the ;Duchuantou ".illite" in Zhejiang province indi- cate that the mineral formerly called "illite" is actually sericite. Its XRD, IR, DTA, SEM and TEM data and, es-pecially, chemical composition exhibit chara- cteristics .of the typical sexioite mineral. The Duchuantou sericite is characterized by Mg0<0.25%,K20>9%, Si/Al< 1.2, octahedral Mg less than 0.03, and octahedral electric charges -0.052- + 0.048/ O10(OH)2, whereas illite is noted for Mg0>2.0%,K20 some 8%,Si/Al> 1.5, octahedral Mg 0.2-0.4, and octahedral electric charges -0.17一-0.40/O10(OH)2. The Duchuantou sericite.has high crystallinity, flaky form, grain size smaller than 5μm, sharp and symmetric 9.95A, (002) peak, and 2 M polytype, while illite generally has low crystallinity, 1 M polytype and gentle (001) peal. In addition, the Duchuantou sericite displays characteristic 3624, 3450, 930, 825 and 799 cm-1 infrared absorptions, 45-111.2℃ weak endqthermic valley and 600- 700℃strong endothermic valley; in contrast, illite does not show apparent 825, 799 cm-1 infrared absorption, but exhibits 100℃ strong endothermal valley and 5000℃ and 9000℃ endothermal valley.

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潘建强,1992,浙江渡船头“伊利石”应属绢云母[J].岩石矿物学杂志,11(4):347~355. Pan Jianqiang Zhejiang Institute of Geology, Mineral Resources, Hangzhou ,1992,The Argument that the Duchuantou "Illite" of Zhejiang Province Is Actually Sericite[J]. Acta Petrologica et Mineralogica,11(4):347~355.

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