海拉尔盆地上库力组重矿物组合特征

海拉尔盆地兴安岭群上库力组自下而上可分出5个重矿物组合：磁黄铁矿-锆石-白钛石-锐钛矿组合，黄铁矿高含量组合，黑云母-白钛石-锆石-钛铁矿组合，菱铁矿-白钛石-黑云母-电气石组合，白钛石-黑云母-菱铁矿-石榴子石组合.不稳定矿物含量高，不同层段呈现高低韵律性变化则与火山-沉积作用强弱交替变化的环境有关.较高的ATi指数反映母岩应为中-酸性火山岩.ZTR指数不高说明重矿物的成熟度较低.由下至上陆源重矿物变少，尤其是上库力组D段（凝灰岩段），自生黄铁矿占很高的百分比.

Heavy mineral assemblages in Shangkuli Formation of the Hailar Basin

Based on analysis of the core samples from Shangkuli Formatron, five heavy mineral assemblages were identified.In ascending order, there were pyrrhotite-zircon-leucoxene-anatase assemblage, pyrite assemblage, biotite-leucoxene-zircon-ilmentite assemblage, siderite-leucoxene-biotite-tourmaline assemblage, and leucoxene-biotite-siderite-garnet assemblage.Unsteady mineral contents were high and had a rhythm in each layer of the formation, caused by alternation of volcanic and sedimentary environments.The high ATi index indicated that the parent rocks should be intermediate and acidic lavas.The lower ZTR index showed a lower mature of heavy minerals.The terrigenous heavy minerals became minor, and the pyrite had a high percentage in Member D of Shangkuli Formation(the tuffaceous member).