【摘要】 对位于中亚造山带东南部,紧邻华北板块北缘的查干哈达花岗岩体进行了岩石地球化学研究。主量元素研究显示查干哈达花岗岩具有SiO₂含量变化较大、准铝质-弱过铝质、碱性-碱钙性、偏铁质等特征;微量元素显示其具有K,Rb,Th,U,Pb和Nd等相对富集,Sr,Ba,Ti,Nb和Ta等相对亏损,稀土总量较高且变化大(96. 7×10^-6～373×10^-6,平均276×10^-6),具有高的La_N/Yb_N值（4. 42～33. 0）,轻稀土富集,具有较强的Eu亏损（δEu=0. 28～0. 67）等特征。绝大多数样品的ACNK均<1. 1、P₂O₅含量均随着SiO₂含量的升高而降低,表明了查干哈达岩体花岗岩应属于Ⅰ型花岗岩。更多还原

【Abstract】 Chaganhada pluton is located in the southeast of the Central Asian Orogenic Belt（ CAOB） and adjacent to the north margin of the North China Craton（ NCC）. The SiO₂ of Chaganhada granites contents show variety,and the Chaganhada Pluton belongs to metaluminous to weakly peraluminous,alkali-calcic to alkali,ferroan granites. Chaganhada granites are all enriched in K,Rb,Th,U,Pb,Nd,LREE and depleted in Sr,Ba,Ti,Nb,Ta,HREE. All samples display high and variety total REE contents( 96. 7 × 10^-6～ 373 × 10^-6,average 276× 10^-6),and strong negative Eu anomalies. The chondrite-normalized REE patterns of Chaganhada granite are characterized by light REE enrichments relative to heavy REE with high,high La_N/Yb_N ratios（ 4. 42 ～ 33. 0）Most samples characterized as ACNK < 1. 1,and negative correlation between P₂O₅ contents and SiO₂ contents. It indicate that Chaganhada granites belong to Ⅰ-type granites.更多还原