新疆尉犁县大西沟铁磷矿床地质及综合利用

GEOLOGY AND COMPREHENSIVE UTILIZATION OF DAXIGOU MAGNETITE-APATITE DEPOSIT IN YULI COUNTY,XINJIANG REGION

通过对大西沟基性杂岩体的地质背景、杂岩体岩石学、微量元素、稀土元素地球化学、矿床地质等研究表明,含矿岩石相属偏碱性铁质岩系列。杂岩体中主要元素与微量元素明显不和谐性,岩石中不相容元素明显富集(Ba、Sr、Zr、P),相容元素(Cr、Co、Ni)明显亏损。含矿杂岩体稀土元素含量较高,轻稀土元素高度富集,Eu无明显异常,稀土配分为向右倾斜较平直的曲线,其δEu值与碱性玄武岩接近,反映杂岩体岩浆来源于地壳深部。由于主、微量元素的不和谐性,从而造成辉石岩中大量铁、磷的晶出,在挥发分的作用下,形成磁铁矿与磷灰石的共生,并在局部地段高度富集形成铁磷矿体。该矿床铁磷共生,伴生有钛等矿产,综合利用前景可观。

After studied on some geological characteristics of Daxigou basic complex,such as the geological background,complx lithology,microelement and rare earth element geochemistry,deposit geology,comprehensive utilization,we found that the ore-bearing lithofacies belonged to basic ferruginous rock series.The major element and rare earth element showed discordance,incompatible elements（Ba、Sr、Zr、P）are rich and compatible element（Cr、Co、Ni）are lack.With higher rare earth element and rich light rare earth element,the ore-bearing complex has non-anomaly Eu.The rare earth partitioning is a flat and rightwards incline curve,the δEu value of which is close to that of alkali basalt,all of which shows that the complex magma come from deep crust.The crystallization of much iron and phosphorous caused the symbiosis of magnetite and apatite,and some magnetite-apatite ore body are formed at some place because of the disharmony of major and rare earth element and the effection of volatile component.It shows that there is better metallogenic conditions and comprehensive utilization foreground for magnetite-apatite deposit in the area.