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Discovery of Authigenic Rare Earth Mineral-Monazite in Precambrian Sedimentary Rock of Dalian Area and its Significance
Author(s): 
Pages: 663-667
Year: Issue:  S1
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  独居石 稀土元素 生物成矿 沉积岩 前寒武纪 震旦系;
Abstract: 自生的稀土元素矿物一独居石在前寒武纪沉积岩中发现尚属首次。产地是大连地区金县金石滩,地层是震旦系的十三里台组。自生独居石发现于灰绿色绢云母化伊利石泥岩中,泥岩作为铁质浸染的红色叠层石灰岩的夹层也包含有针铁矿的细脉,因为许多独居石聚晶是被包裹在针铁矿细脉中。可以确定蓝细菌的生物矿化作用对于自生独居石和铁质浸染的形成都起了作用。电镜扫描和电子探针的能谱、波谱分析证实:自生独居石为10μm左右的半自形柱状单晶。单晶的柱面和轴面清渐可辨,集合体最大直径50μm左右。经波谱分析自生独居石的化学成份为(%):Ce2O333.28,La2O39.52,Nd2O317.26,P2O330.04,ThO22.73,Pr2O33.12,Sm2O32.01,Gd2O30.59,UO20.19,Fe2O50.34,SiO20.56,CaO0.14,Al2O30.08,TiO20.11,Na2O0.01,总计99.98。因此,自生独居石应属于Ca,La,Nd的独居石变种。自生独居石的发现为利用U,Th-Pb法测定无化石的前寒武纪地层同位素年龄显示了可能性。
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