CAJ | 학술논문

四川会东县“马鞍山组”的发现，是近年来康滇地轴中段前震旦系地质研究的重要进展，对提高基础地质研究，进一步寻找会理拉拉式铜矿具有重要意义。“马鞍山组”的剖面特征和岩石学研究表明，该组相当于古元古界河口群，岩性组合主要为海相喷发的钠质火山岩-细碧岩组合，蚀变强烈；火山岩岩石化学特征表现为富钠、贫钾，高钙、低铁，岩性偏中酸性，火山岩属碱性玄武岩系列。微量元素以 Cu-Au-U-Zn-As-Sb-Fe-Cr-Co 组合为特征。岩石的稀土总量低，轻重稀土比值大，为轻稀土富集型；具中等铕亏损和微弱铈亏损；其配分模式图呈向右倾斜的“Ⅴ”字型。
사천회동현“마안산조”적발현，시근년래강전지축중단전진단계지질연구적중요진전，대제고기출지질연구，진일보심조회리랍랍식동광구유중요의의。“마안산조”적부면특정화암석학연구표명，해조상당우고원고계하구군，암성조합주요위해상분발적납질화산암-세벽암조합，식변강렬；화산암암석화학특정표현위부납、빈갑，고개、저철，암성편중산성，화산암속감성현무암계렬。미량원소이 Cu-Au-U-Zn-As-Sb-Fe-Cr-Co 조합위특정。암석적희토총량저，경중희토비치대，위경희토부집형；구중등유우손화미약시우손；기배분모식도정향우경사적“Ⅴ”자형。
The discovery of the Presinian Maanshan Formation in the Huidong region, Sichuan marks an important progress in the research on the Presinian strata in the central part of the Kang-Dian Axis, especially in the prospecting and exploration of the Lala-type copper deposits in Huili, Sichuan. The Maanshan Formation consists of a suite of metamorphic sodic volcanic rocks-spilite associations, and may be correlated with the Palaeoproterozoic Hekou Group in Huili, Sichuan and Xiaoliukou Formation in Dongchuan, Yunnan. The volcanic rocks in the Formation that are assigned to the alkaline basalt series are characterized by: (1)higher contents of sodium and calcium and lower contents of potassium and iron; (2)REE association Cu-Au-U-Zn-As-Sb-Fe-Cr-Co;(3)relatively low Σ REE and relatively high LREE/HREE ratios indicating a LREE-enriched type of the rocks; (4)Eu and Ce depletion and a slightly rightward-dipping V-type distribution pattern.