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Chemical Composition and REE Pattern of Hydrothermally Deposited Albitite in Northern Guangdong Province
Author(s): LIANG Huaying, WANG Xiuzuo, CHENG Jingping
Pages: 415-
420
Year: 2001
Issue:
3
Journal: ACTA SEDIMENTOLOGICA SINICA
Keyword: 钠长石岩; 稀土元素; 热水沉积; 粤北;
Abstract: 大沟谷含金钠长石岩带上为层状下为脉状产于震旦系乐昌峡群片岩中,主要由钠长石岩及碳酸盐岩组成.钠长石岩多为块状及条带状构造.钠长石岩和片岩化学成分不同,钠长石岩相对富集Al2O3、TiO2、MnO、Na2O、P2O5,而贫Fe2O3、FeO、MgO、CaO、K2O.在主要氧化物组成的直角坐标图上,钠长石岩和片岩位于不同的区域及具不同的变化趋势.钠长石岩稀土元素含量较低,在12.56×10-6-55.66×10-6之间,具较低的La/Yb(1.82~6.42)、La/Sm(0.96~2.99)、Gd/Yb(0.99~2.71)比值,较大的δEu异常范围(0.41~0.8),弱的δCe异常.钠长石岩地质产状特征及稀土元素特征表明其主要是热水沉积形成的.
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