中朝准地台北缘岩浆岩型磷矿成矿带东端朔州碱性杂岩及磷矿地质特征

Geologic features of Shuozhou alkali mixtite and phosphate deposits in the eastern end of magmatic phosphate metallogenic belt of China-Korea paraplatform north margin

朔州碱性杂岩磷矿位于朝鲜北部平安北道,距鸭绿江约10km,大地构造位于中朝准地台营口-宽甸-狼林隆起东部,是朝鲜重要磷矿基地之一,与我国矾山和马伸桥含磷碱性杂岩处于同一构造岩浆岩带,这三个碱性杂岩型磷矿都是大型矿床。马伸桥和朔州碱性杂岩是塔里木-中朝准地台目前发现的两个典型超基性-碱性-碳酸岩三位一体的杂岩,是最具成矿远景的杂岩,根据“古老地台边缘及内部活动带受深大断裂控制的幔源超基性-碱性-碳酸岩杂岩型磷矿成矿模式”和预测准则,塔里木-中朝准地台该类碱性杂岩型磷矿成矿远景十分可观。朔州碱性杂岩划分为三期侵入岩:第一期为正长辉石岩类;第二期为碱性岩,包括碱性正长岩、霞石正长岩和霞石岩;第三期为碳酸岩,包括方解石碳酸岩和白云石碳酸岩。磷灰石矿有碳酸岩型、碱性岩型和交代型三个类型,矿石品位6.9%~9.5%(P2O5),探明储量1亿t,远景储量数亿t,此外伴生有蛭石矿。

Shuozhou phosphate deposit of alkaline mixtite is one of the important phosphate mine bases in DPRK.It is located in North Pyongan about 10 km from the Yalu River.It is located in the east of Yingkou-Kuandian-Langlin uplift of China-Korea paraplatform and is located in the same tectonic magmatic zone as Fanshan and Mashenqiao Phosphorus-containing mixtite.All three alkali mixtite phosphate mines are large deposits.Mashenqiao and Shuozhou alkaline mixtite are two typical superbasic-alkaline-carbonated Trinity mixtite found in Tarim-China-Korea paraplatform.They are the most metallogenic perspective mixtites.According to“the model of mantle source superbasic-alkaline-carbonated mixtite phosphate deposit which is controlled by deep faults on the edge of ancient platform margin and inner active zone”and the prediction rules,this kind of alkaline mixtite phosphate deposit is very considerable in Tarim-China-Korea paraplatform.Shuozhou alkaline mixtite is divided into three stages of intrusive rocks:the first stage is orthoclase pyroxenite;the second stage is alkaline rock,including alkaline syenite,nepheline syenite and nephelinite;the third stage is carbonatite,including calcite carbonatite and dolomite carbonatite.There are three types of apatite:carbonate,alkaline and metasomatic.The ore grade is 6.9%~9.5%(P2O5),the proven reserves are 100 million tons,the prospective reserves are hundreds of millions of tons,and the vermiculite is accompanied.