中国冶金地质总局西北地质勘查院
纸质出版:2024
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[1]魏博,全孝勤,张旗,等.新疆巴楚瓦吉里塔格碱性岩有关的Nb-Ta-REE矿床地质特征、地球化学及其成因[J].新疆大学学报(自然科学版中英文),2024,41(05):606-619.
[1]魏博,全孝勤,张旗,等.新疆巴楚瓦吉里塔格碱性岩有关的Nb-Ta-REE矿床地质特征、地球化学及其成因[J].新疆大学学报(自然科学版中英文),2024,41(05):606-619. DOI: 10.13568/j.cnki.651094.651316.2024.04.21.0001.
DOI:10.13568/j.cnki.651094.651316.2024.04.21.0001.
瓦吉里塔格碱性岩有关的Nb-Ta-REE矿床位于塔里木克拉通北缘,是近年来在塔里木北缘碱性岩带中发现的、具有代表性的稀有-稀土综合性矿床.通过对其进行详细的矿床地质学、地球化学和构造环境研究,结果表明瓦吉里塔格碱性岩主要为中性-基性-超基性杂岩体,后期有碳酸岩脉、似金伯利岩岩筒及煌斑岩脉贯入.地球化学特征显示其均属碱性岩系列,具有明显结晶分异特征.碱性杂岩体(脉)的稀土配分曲线基本平行,均表现出LREE略富集、HREE亏损的右倾特征,轻稀土分馏特征较重稀土明显.从辉石岩到辉长岩、再到霓霞正长岩类,ΣREE含量逐渐增高,具较为一致的微量元素蛛网图曲线(富集大离子亲石元素,相对亏损高场强元素),具有同源演化特征.岩石成因研究表明,镁铁质岩浆可能源自亏损的地幔源区,演化过程中经历了一定的橄榄石及辉石和钛铁氧化物的分离结晶,岩浆演化后期受到了一定程度的同化混染作用.主体形成于晚石炭世-早二叠世的板内伸展构造环境.碱性岩体中具有较好的碱性岩型稀有(Nb、Ta)矿产找矿前景,其中碳酸岩体(脉)具有较好的寻找碳酸岩型稀土矿的找矿前景.
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 rightleaning 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 ofΣREE 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.
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