CAJ | 학술논문

对广西大厂矿田的侵入岩体开展主量元素、微量元素以及稀土元素的分析。结果表明，岩石中斑晶和基质主要由石英、钾长石以及斜长石组成，其中，斑晶约占15%，基质约占85%。岩石中硅含量偏低，Al2O3含量偏高；另外，Ca、Fe2O3、Na以及TiO2等含量也较低。侵入岩体中碱含量中等，属于富钾型岩石；稀土元素含量中等至偏低，其中，轻稀土元素和重稀土元素高度分馏，显示出Ce微弱负异常、Eu负异常特征。岩体富集轻稀土元素，Rb、Sr以及U等大离子亲石元素也较富集，而Nb、Th等高场强元素则相对亏损。稀土元素球粒陨石标准化分布型式总体表现出较好的一致性，大体上表明各岩体具有相似的特点、来源以及演化等，侵入岩体主要形成于碰撞时期以及板内构造时期。
대엄서대엄광전적침입암체개전주량원소、미량원소이급희토원소적분석。결과표명，암석중반정화기질주요유석영、갑장석이급사장석조성，기중，반정약점15%，기질약점85%。암석중규함량편저，Al2O3함량편고；령외，Ca、Fe2O3、Na이급TiO2등함량야교저。침입암체중감함량중등，속우부갑형암석；희토원소함량중등지편저，기중，경희토원소화중희토원소고도분류，현시출Ce미약부이상、Eu부이상특정。암체부집경희토원소，Rb、Sr이급U등대리자친석원소야교부집，이Nb、Th등고장강원소칙상대우손。희토원소구립운석표준화분포형식총체표현출교호적일치성，대체상표명각암체구유상사적특점、래원이급연화등，침입암체주요형성우팽당시기이급판내구조시기。
The major element, trace element and rare earth element (REE) of the intrusion rock from the Dachang ore field in Guangxi, China, were analyzed. The results show that the phenocryst (about 15%) and matrix (about 85%) mainly consist of quartz, K-feldspar and plagioclase. The rock is composed of low content of Si and high content of Al2O3, low contents of Ca, Fe2O3, Na, TiO2, etc. The intrusion rock has the medium alkali content, attributing to K-rich type rock; and contains medium to low REE contents, of which light rare earth elements (LREEs) and heavy rare earth elements (HREEs) are highly fractionated, showing a weak negative Ce anomaly and a negative Eu anomaly. These rocks are enriched in LREE, and the large ion lithophytes elements (LILE) are rich in Rb, Sr, and U; the high-field-strength elements (Nb, Th, etc) are relatively depleted. The REE chondrite?normalized patterns are consistent with the overall, roughly indicating their similar characteristics, sources and evolution. The intrusion rock mainly formed during the collisional and within-plate periods.