物探与化探2016，Vol.40Issue(5)：885-892,8.DOI:10.11720/wtyht.2016.5.07
内蒙古阿鲁科尔沁地区早白垩世侵入岩地球化学特征及其成矿潜力
Geochemistry and metallogenic potentiality of Early Cretaceous intrusive rocks in Ar Horqin area, Inner Mongolia
摘要
Abstract
Located in the eastern Central Asian orogenic belt, Ar Horqin area has widely distributed Mesozoic magmatic rocks. In this paper, petrologic and element geochemical studies were carried out for the early Cretaceous intrusive rocks in Ar Horqin area. The study of petrology indicates that the granitoids are mainly composed of granodiorite, adamellite and granite⁃porphyry. Major element geochem⁃istry shows that the rocks are quasi⁃aluminous cal⁃alkaline granites, which are characterized by relatively rich silicon and sodium and poor potassium. Trace elements have a similar variation trend characterized by low REE, fractionation of REE, significant negative a⁃nomaly of Eu, depletion of Nb, Ta, P, Ti, and enrichment of LREE, Rb, Th, U, Zr, La. Main body of the granites belongs to calc⁃alkaline I genetic type. The magmas were formed by partial melting of the crust in an extensional setting after the collision, which was a favorable metallogenic tectonic evolution stage. DI values, K/Rb and Rb/Sr ratios are larger, SI values are smaller, and Fe2 O3/FeO ratios are also larger, suggesting that the granites belong to low evolution, highly fractionated oxidation type or magnetite series. Their geochemical ore parameters indicate that Mo, Cu, Pb⁃Zn mineralization potentiality decreases systematically, and Au mineralization po⁃tentiality is poorer.关键词
阿鲁科尔沁/早白垩世/I型花岗岩/地球化学特征/后碰撞伸展/成矿潜力Key words
Ar Horqin/Early Cretaceous/I-type granites/geochemical characteristics/extensional setting/mineralization potential分类
天文与地球科学引用本文复制引用
鲁艳明,所承逊,专少鹏,殷敏..内蒙古阿鲁科尔沁地区早白垩世侵入岩地球化学特征及其成矿潜力[J].物探与化探,2016,40(5):885-892,8.基金项目
内蒙古自治区地质矿产勘查基金中心“内蒙古自治区阿鲁科尔沁旗等四幅1∶5万区域矿产地质调查”项目 （）
