摘要
辽吉内生硼矿分布于宽甸群的高小岭组（Ｐｔ１ｋｎ４）、老营沟组（Ｐｔ１ｋｎ６）和砖庙组（Ｐｔ１ｋｎ７）地层中。在硼矿床中，硼镁铁矿－硼铁矿系列的矿物有富镁硼铁矿、富铁硼镁铁矿和富镁硼镁铁矿。它们的矿物学特征取决于ｊ值［ＦｅＯ／（ＦｅＯ＋ＭｇＯ）］，ｆ值增大，硼镁铁矿的反射色、反射多色性和偏光色明显；红外光谱则表现为ν２和ν４的振动频率低移；晶胞参数ａ０和ｃ０增大。ｆ值减小，颜色、多色性变化明显。从Ｐｔ１ｋｎ４→Ｐｔ１ｋｎ６→Ｐｔ１ｋｎ７，硼镁铁矿的ｆ值逐渐减小，氧化系数增大，其形成向着富镁、氧化程度高的方向演化。硼镁铁矿的矿物学特征具有含硼层的指示意义。
Abstract In the paper,minerals of ludwigite-vonsenite series are studied for endogenetic borate deceits in Liaoning -Jilin Region.These minerals include rich-Mg vonsenite,rich-torn ludwigite and rich-Mg ludwigite.Their mineralogy characters depend on ratio between FeO and(FeO + MgO).When FeO/(FeO+ MgO) increase, reflecting colour,reflection pleo-chroism and polarization colour are apparent, the viberation frequences of υ2 and υ4 are decreased in infrared spectroscopy and the unit cell parameters(a,C0) are increased.From Gaoxiaoling formation (Pt1kn4) to (Pt1kn6)and to Zhuanmiao formation (Pt1kn7)of Kuandian Group,the FeO/(FeO+MgO) of ludwigite is decreased,but the oxidation ratio is increased,The formation of ludwigite is advance towards the direction of rich-Mg and oxidation evolution.
