THE OCCURRENCE OF BORON ORE DEPOSITS AND PROSPECTING GUIDE IN EASTERN LIAONING PROVINCE

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.