阿木古楞岩体位于内蒙古东乌珠穆沁旗旗行政中心正北。路线地质调查可分解为两期岩石单元:灰黄色中细粒、粗中粒含巨斑二长花岗岩和灰白色细粒二长花岗岩。前者锆石U-Pb加权平均年龄为314.2±2.2Ma,为晚石炭世岩浆活动的产物,后者锆石U-Pb加权平均年龄为167.1±1.3Ma,为中—晚侏罗世岩浆活动的产物。这两期花岗岩副矿物均富含磁铁矿、独居石、磷灰石和榍石,中—晚侏罗世花岗岩还发育萤石矿物。在地球化学特征上,两期花岗岩也表现出相似性:主量元素表现为总体富Si,且有较高的分异指数(DI)及碱/铝(NK/A)、Fe2O/FeO比值,较低的总Fe、Ti、Mg、Ca和P含量;微量元素蛛网图则表现为富集大离子亲石元素Rb、Th、U、Pb,弱富集轻稀土元素La、Ce,明显亏损高场强元素Nb、Ba和Sr、Ti;而稀土元素配分图表现出相对富集轻稀土元素、亏损重稀土元素,轻重稀土元素分异较大、重稀土曲线却较为平坦的右倾型特征。综合分析认为:两期花岗岩单元均属于高分异准铝质—弱过铝质高钾钙碱性系列的I型花岗岩,其源区物质均可能为来自亏损地幔物质经过改造形成的年轻的陆壳高K、正常水含量的长英质陆壳岩石物质,且晚石炭世花岗岩单元长英质陆壳岩石物质来源中还混合有幔源的玄武质组分。而其中—晚侏罗世花岗岩单元岩浆来源更有可能源于早期的晚石炭世花岗岩的重熔或部分重熔,至少具有类似的岩浆源区。阿木古楞岩体中晚石炭世花岗岩单元形成于中亚造山挤压造山大地构造背景下的同碰撞晚期构造—岩浆事件,中—晚侏罗世花岗岩单元形成于蒙古—鄂霍次克洋和古太平洋构造域转换、大地构造背景以伸展拉张为主的后碰撞造山构造—岩浆事件。 Amu Gurrenhei body is located in Inner Mongolia East Wuzhu Muqin flag administrative center is north. The geological survey of the route can be decomposed into two phases of rock units: faintly yellowish fines, coarse and medium-sized granite-bearing monzonitic granite and finer-grained monzogranite. The former zircon U-Pb weighted average age is 314.2 ± 2.2Ma, which is the product of the Late Carboniferous magmatism. The U-Pb zircon U-Pb weighted average age is 167.1 ± 1.3Ma, which is the mid-late Jurassic magmatic activity product. Both of these granitoids are rich in magnetite, monazite, apatite and limestone, and the mid-late Jurassic granites also developed fluorite minerals. Geochemical characteristics of the two granites also showed similarities: the main elements showed the overall Si-rich, and has a higher differentiation index (DI) and alkali / aluminum (NK / A), Fe2O / FeO ratio, Lower total Fe, Ti, Mg, Ca and P content. Trace elemental cobras are characterized by enrichment of large ion lithophile elements Rb, Th, U, Pb and weak enrichment of light rare earth elements La and Ce Field strength elements Nb, Ba and Sr, Ti. The REE distribution diagram shows a right-leaning type that is relatively enriched in light rare earth elements, depleted in heavy rare earth elements, large in light and heavy rare earth elements, and relatively heavy in heavy rare earth elements. The comprehensive analysis shows that both granitic units belong to I-type granites with high-grade quasi-Al-Weak Al-Alkali, high-K calc-alkaline series. The source materials of these two granites are likely to be the young land formed by the transformation of depleted mantle materials Quartzite with high K and normal water content, and mantle-derived basaltic components in the source rocks of the carbonate rocks of the late Carboniferous granite. The Late Jurassic granitic units are more likely to originate from the remelting or partial remelting of early Late Carboniferous granites, with at least similar magmatic source areas. Late Carboniferous granitic units in the Amu-gonorrhea body were formed in the syn-collision late tectono-magmatic events in the Mesozoic orogeny crustal tectonic setting. Meso-Late Jurassic granite units formed in the Mongolia-Okhotsk and ancient Pacific tectonic domain transformation, tectonic-magmatic event with post-collisional orogeny dominated by tectonic setting.