Mafic microgranular enclaves (MMEs) in host granitoids can provide important constraints on the deep magmatic processes. The Oligocene-Miocene granitoid plutons of the NW Anatolia contain abundant MMEs. This paper presents new hornblende Ar-Ar ages and whole-rock chemical and Sr-Nd isotope data of the MMEs from these granitic rocks. Petrographically, the MMEs are finer-grained than their host granites and contain the same minerals as their host rocks (amphibole + plagioclase + biotite + quartz + K-feldspar), but in different proportions. The Ar-Ar ages of the MMEs range from 27.9 ± 0.09 Ma to 19.3 ± 0.01 Ma and are within error of their respective host granitoids. The MMEs are metaluminous and calc-alkaline, similar to I-type granites. The Sr-Nd isotopes of MMEs are 0.7057 to 0.7101 for ⁸⁷Sr/⁸⁶Sr and 0.5123 to 0.5125 for ¹⁴³Nd/¹⁴⁴Nd, and are similar to their respective host granitoids. These lithological, petrochemical and isotopic characteristics suggest that the MMEs in this present study represent chilled early formed cogenetic hydrous magmas produced during a period of post-collisional lithospheric extension in NW Anatolia. The parental magma for MMEs and host granitoids might be derived from partial melting of underplated mafic materials in a normally thickened lower crust in a post-collisional extensional environment beneath the NW Anatolia. Delamination or convective removal of lithospheric mantle generated asthenospheric upwelling, providing heat and magma to induce hydrous re-melting of underplated mafic materials in the lower crust.

寄主花岗岩中的镁铁质微粒飞地（MME）可以为深部岩浆过程提供重要的限制。NW Anatolia 的渐新世-中新世花岗岩类岩体含有丰富的 MME。本文介绍了这些花岗岩中 MME 的新角闪石 Ar-Ar 年龄和全岩化学和 Sr-Nd 同位素数据。在岩相学上，MME 比其寄主花岗岩的粒度更细，并且包含与其寄主岩石相同的矿物（角闪石 + 斜长石 + 黑云母 + 石英 + 钾长石），但比例不同。MME 的 Ar-Ar 年龄范围从 27.9 ± 0.09 Ma 到 19.3 ± 0.01 Ma，并且在其各自寄主花岗岩的误差范围内。MME 是金属铝质和钙碱性，类似于 I 型花岗岩。对于⁸⁷ Sr/ ⁸⁶，MME 的 Sr-Nd 同位素为 0.7057 至 0.7101¹⁴³ Nd/ ¹⁴⁴ Nd 的Sr 和 0.5123 至 0.5125 ，与它们各自的寄主花岗岩相似。这些岩性、石化和同位素特征表明，本研究中的 MME 代表了在安纳托利亚西北部的碰撞后岩石圈伸展期间产生的冷却的早期共生含水岩浆。MME 和寄主花岗岩的母体岩浆可能来自安纳托利亚西北地区下碰撞后伸展环境中正常增厚的下地壳中未镀层的基性材料的部分熔融。岩石圈地幔的分层或对流去除产生软流圈上涌，提供热量和岩浆，以诱导下地壳中未镀层的基性材料发生含水再熔化。