Geological Characteristics,Geochemistry and Genesis of the Nb-Ta-REE Deposit Related to Wajilitage Alkaline Rock in Xinjiang of China
The Nb-Ta-REE deposit related to Wajilitage alkaline rocks is located in the northern margin of Tarim Craton,which is a representative REE-rare comprehensive mine in the northern edge alkaline belt in Tarim.Through detailed geological,mineral geological,chronological,geochemical and tectonic environment studies,the results show that the alkaline rocks of Wajilitage are mainly neutral-basic-ultrabasic complexes,while the later period,there are carbonate,kimberlite-like rock tubes and porphyry lamprophyre intrusion.The geochemical characteristics show that they are all alkaline rock series and have obvious crystallization characteristics.The REE partition curves of alkaline complex(veins)are basically parallel,showing a slight enrichment of LREE and a right-leaning of HREE deficit.The fractionation characteristics of LREE are more obvious than that of HREE.From pyroxene to gabbro and then to aegarine syenite,the content of ∑REE is gradually increased,with a relatively consistent spider diagram curve of trace elements(enrichment of large ion lithophile elements,relative loss of high field strength elements),with homologous evolution characteristics.Petrogenetic studies show that mafic magmas may originate from depleted mantle sources,and have undergone certain separation and crystallization of olivine,pyroxene and ferrotitanium oxides during the evolution process,and have been subjected to a certain degree of assimilation and mixing in the later stage of magmatic evolution.The formation age of the main body is late Carboniferous-Early Permian,formed in the intraplate extensional tectonic environment.The alkaline rock body has a good prospecting prospect for rare Nb and Ta minerals,and the carbonate rock body(vein)has a good prospecting prospect for rare earth minerals of carbonate rock.
alkaline rockREE orerare metal oreWajilitagenorthern margin of Tarim
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