摘要
辽宁省营口东部是我国白硼矿床重要产区之一。白硼矿床赋存在早元古宙辽东裂谷带内。辽河群里尔峪岩组，黑云变粒岩、电气变粒岩夹含硼镁橄岩为含硼岩系。东西向、北西向断裂带为储矿构造，辽河期复式深成黑云母二长花岗岩为其成矿母岩 (热源体 )。蛇纹石化大理岩、蛇纹石化镁橄岩是重要的含硼蚀变岩带及找矿标志。
East Yingkou of Liaoning Province is one of important sources of boron deposits in China.Boron deposits in East Liaoning mostly occurred in the axial depression area of Early Proterozoic. All discovered boron deposits distribute in magnesium rich carbonatite and magnesium rich silicate rocks in Lieryu petrofabric of Liaohe Group,that is,the boron bearing rock system is biotite leptite and tourmaline leptite interbedding boron bearing forsterite.Their impounding structures are EW-and NW trending faults,and the ore forming mothor rock is multiple plutonic biotite adamellite. Boron bearing altered rock belts occurred in the lower of MemberⅠ of Lieryu perofabric of Liaohe Group,which are mainly consisted of serpentinized marble,serpentinized forsteritite.In general,the ore prospecting criteria:1.magnesium rich carbonatite,where strongly altered,obviously zoning,MgO content more than 35％ and CaO content no more than 5％ ;2.tourmaline rocks developing area on the top and bottom of altered rock belts;3.strata inversed area;4.hinge zone of near EW trending fold structures(especially syncline structures);5.effective boron anomy high (more than 1.8× 10-6) area. The following areas are favourable to prospect large scale deposits:from NE Chagou boron deposit to Shidonggou;2.from WN Houxianyu boron deposit to Weijiapuzi;3.from Liujiatai to N.Fengjiapuzi.
出处
《辽宁地质》
2000年第4期249-258,共10页
关键词
控矿条件
找矿方向
白硼矿床
含硼岩系
成矿作用
Yingkou
characteristics of boron deposits
ore controlling condition
ore prospecting direction4
