CAJ | 학술논문

西准噶尔石炭纪包古图组火山岩主要由玄武岩、玄武安山岩、安山岩、粗安岩组成，属碱性系列。SiO2含量为45.13%~53.05%，全碱含量高（Na2O+K2O=5.08%~8.89%），TiO2含量较高（1.71%~2.77%），稀土总量较高（∑REE=159.7×10-6~301.5×10-6）。轻稀土明显富集（（La/Yb）N=5.76~11.69），样品多无明显 Eu 异常（Eu/Eu*=0.78~1.45）。大离子亲石元素Rb，Ba，K相对富集，并富集高场强元素Nb，Ta，Zr，Hf等，具典型洋岛型玄武岩（OIB）特征，可能形成于大洋板内海山环境。此推论为西准噶尔地区大洋阶段热点成因的海山火山岩提供了信息。
서준갈이석탄기포고도조화산암주요유현무암、현무안산암、안산암、조안암조성，속감성계렬。SiO2함량위45.13%~53.05%，전감함량고（Na2O+K2O=5.08%~8.89%），TiO2함량교고（1.71%~2.77%），희토총량교고（∑REE=159.7×10-6~301.5×10-6）。경희토명현부집（（La/Yb）N=5.76~11.69），양품다무명현 Eu 이상（Eu/Eu*=0.78~1.45）。대리자친석원소Rb，Ba，K상대부집，병부집고장강원소Nb，Ta，Zr，Hf등，구전형양도형현무암（OIB）특정，가능형성우대양판내해산배경。차추론위서준갈이지구대양계단열점성인적해산화산암제공료신식。
The volcanic rocks from Carboniferous Baogutu Formation is mainly characterized by intermediate to basic serieswhich are composed of basalt,basaltic andesites,andesites and trachyandestes.They belong to alkalic series.The samples have similar geochemical characteristics to those of OIB,with SiO2(45.13%~53.05%),high alkali(Na2O+K2O=5.08%~8.89%),TiO2(1.71%~2.77%),and rare earth elements (∑REE=159.7×10-6~301.5×10-6)contents. The Chondrite-normalized REE distribution patterns show enrichment in LREE((La/Yb)N=5.76~11.69)to HREE and have no Eu anoma-lies(Eu/Eu*=0.78~1.45,except 0.06),the samples are all enriched in HFSE(such as Nb,Ta,Zr and Hf) and LILE(such as Rb,Ba and K.).So it is believed that the volcanic rocks from Carboniferous Baogutu Formation are derived from en-riched mantle,and formed in a seamount of the ocean floor,is a product of seamount volcanism with hotspot in ocean evolution stage.