塔里木地台北缘内生磷矿预测及资源远景评价

THE FEASIBILITY STUDAY AND METALLOGENIC PREDICTION OF ENDOGENESIS PHOSPHORITE RESOURCES IN THE NORTHERN EDGE OF TALIMU PLATFORM

塔里木地台北缘深断裂两侧有多处碱性杂岩体分布。通过对其长约2000km范围内地质资料的搜集,实地地质调查,遥感资料解译,航、地磁异常资料的分析与实测工作、重点评价区工程验证等一系列成果的综合分析与研究,发现260km铁磷矿化带,控矿岩体具有"串珠状等距性特征,铁磷矿体主要赋存在辉石岩和黑云母辉石岩中。"在三个调查区中划分出9个找矿远景区。尉犁--兴地调查区中发现多处偏碱性超基性杂岩体,其中三处远景区经深部验证均发现铁磷矿体。是寻找内生磷矿颇具找矿前景的地区。温宿-拜城调查区是寻找Nb-Ta-P矿前景的最佳地段。巴楚--阿图什调查区应是寻找碳酸盐型磷-稀土矿的有利地区。经研究提出:"古老地台边缘受深大断裂控制的偏碱性-超基性杂岩成矿,碱幔分异-碱性偏碱性不混熔岩浆成矿-熔离作用形成层状铁磷矿体的成岩成矿模式"。

There are many alkalinity complex rock bodies on the both sides of the deep-seated fault of Talimu Platform. We surveyed the area which long about 2000km, Through comprehensive study to a series of achievements of the surveying work such as gathering the geologic informations,on the spot surveying,remote sensing material interpretation, analysis and surveying of the aeromagnetic anomaly and magnetic anomaly datas, engineering verification of the amphasis appraisal area, we found a iron-phosphorite ore dand which long about 260km.The ore control rock body possess ashoestring equidistance characteristics and the iron-phosphorite ore bodies occurenceded in pyroxenlite and biotite pyroxenolite.We mark off 9 dousing prospects among 3 suvery districts.In Yuli-Xingdi survery district,we found many metealkalinity-ultrabasis rock complex bodies. Through deep verificating ,We found iron-phosphorites in three prospects,they have a dousing foreground for searching endogenesis phosphorite. Baicheng-Wensu suvery district is the best plat for searching Nb-Ta-P.Bachu-Ayushi suvery district is a beneficial district for searching carbonatite phosphiorite deposits and rare-earth deposits.We put forward the diagenetic pattern and minerogenetic pattern that ＂The bedded iroe-phosphiorite ore bodies are formed by metealkalinity-ultrabasis rock complex bodies controlled by discordogenic faults in old platform edge, and formed by metealkalinity -alkalinity immiscible magma form mantle through differentiation by liquation＂.