THE OCCURRENCE OF BORON ORE DEPOSITS AND PROSPECTING GUIDE IN EASTERN LIAONING PROVINCE
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摘要: 辽东地区硼矿床受控于华北地台东北部大石桥-凤城-宽甸古隆起构造带.元古宇辽河群下部里尔峪组含硼岩系呈W-E、NE向、长约350 km、宽60 km的长条带状展布.硼矿体发育于里尔峪组蛇纹石化镁橄岩或蛇纹石化富镁大理岩中,具有明显的层控和岩控特征.虎皮峪-红石砬子-清河近东西向线状紧密的复式背、向斜间多期次次级的背、向斜发育,表现出明显的塑性变形.硼矿体在走向和倾向上具尖灭膨缩现象.围岩蚀变强烈.大量的电气石化使围岩中硼元素的含量偏高;蛇纹石化镁橄岩或蛇纹石化富镁大理岩的Ca/Mg比值波动极大,表明其与成矿关系十分密切;含硼岩系的厚度与矿体的关系呈正相关性,当厚度超过35 m时就有可能成矿,且厚度越大,矿体的规模和矿石质量越好.在部分地区,赋矿的褶皱构造完全倒转,有里尔峪组的层序倒转,混合岩段反转至上部,且混合岩化明显增强,形成混合岩化花岗岩,而其下部250~600 m是含硼岩系,发育优质隐伏硼矿.据辽东地区硼矿体的这些特征,推测了4个成矿远景区.Abstract: The boron ore deposits in Eastern Liaoning region are tectonically controlled by the Dashiqiao-FengchengKuandian paleo-doming structural zone in the northeast part of North China platform. The boron-bearing series, occurred in Lieryu formation, lower Liaohe group, Proterozoic, are distributed in a W-E- and NE-trending belt of 350 km long and 60 km wide. The ore bodies are developed in serpentinized megnisio-peridotite or serpentinized Mg-rich marble of Lieryu formation, with obvious stratabound and lithological controlled characters. The wall rocks are severely altered. The tourmalinization leads a high content of B element in the wall rocks. The ratio of Ca/Mg in the serpentinized megnisio-peridotite or serpentinized Mg-rich marble varies sharply, showing a close relationship between the rocks and mineralization. The thickness of the boron-bearing series is positively correlated to the development of ore bodies. Based on the characteristics of the boron ore bodies in Eastern Liaoning, four prospective areas are predicted.
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