我国首例典型超基性-碱性-碳酸岩杂岩体及磷矿的发现

通过40年前验证马伸桥航磁异常获得的隐伏超基性碱性岩体钻孔原始编录等资料的综合分析研究,发现了岩体深部为火成碳酸岩体,从而确立为我国首例典型超基性岩-碱性岩-碳酸岩三位一体的杂岩;发现超基性岩为一多韵律的层状岩系;发现9个磷矿层,累积厚度68.25m,P2O5含量6%¹2.6%,已构成大型中品位磷灰石矿床。马伸桥杂岩体与矾山杂岩体具有诸多相同或相似性特点,有极大可比性:都是航磁发现的隐伏岩体、围岩为中元古代蓟县系白云岩、产出的地质构造为燕山台褶带、成矿时代为印支期、多韵律的层状岩系、产大型到超大型磷灰石矿……。这才是"矾山式"磷矿的独特特点。

THE FIND OF THE FIRST TYPICAL ULTRABASIC-ALKALI- CARBONATITE COMPLEX AND PHOSPHORITE DEPOSIT IN CHINA

Based on comprehensive analysis of primary logging data of buried ultrabasic alkali rock mass from verifying abnormality 40years before, igneous-carbonatite rock mass has been found, which was determinated to be the first typical ultrabasicrock -alkali rock,carbonatite rock trinity complex. The ultrabasic rock was multi-rhythmic bedded rock formation, there were 9 phosphate ore bed have been found with total thickness 68.25m and P205 4%- 12.6%, which has been a large medium grade deposit. There are many same or similar features between Mashenqiao complex and Fanshan complex with exceptionally large comparability. Both of them awere found through aeromagnetic anomaly, their adjacent rock were mesoproterozoic Jixian system dolomite , the occurrence structure was Yanshan fold belt and both were multi-rhythmic bedded rock formation formed in indo-Chinese epoch, which produced large-ultra large apatite deposit. This is the unique feature of ＂Fanshan type＂.