Basement rocks from the Western Hindu Kush preserve evidence of multiple metamorphic and magmatic events that occurred along the boundary between the Archean–Proterozoic Afghan Central and Afghan–Tajik Blocks. To verify the different metamorphic stages or events, mineral textures and phase equilibria in metamorphic basement rocks and their age relations to magmatic episodes have been investigated. Quartzofeldspathic gneiss and migmatite with lenses of amphibolite (with assumed Proterozoic age for their metamorphism) are intruded by the Triassic Hindu Kush granitoid batholith and small Cretaceous and Oligocene granite intrusions. The age of thermal overprint (210–170 Ma) by the Triassic batholith is confirmed by new monazite data. Both Triassic and Cretaceous granitoids and surrounding basement rocks underwent subsequent metamorphism up to epidote–amphibolite facies. The degree of this metamorphism increases southward at the contact to the Kabul Block, which under‐plates the Western Hindu Kush from the south. An early Miocene age was obtained by Pb–Th analyses in thorite and huttonite, which are close or slightly younger than the Oligocene granite in this area. The Cretaceous meta‐granodiorite near the border with the Kabul Block contains xenoliths of granulite facies rocks that could come from the Neoarchean granulite facies basement of the Kabul Block. The multi‐stage metamorphic and magmatic evolution classifies the Hindu Kush mountain belt as a long‐lived suture zone that was active since the early Palaeozoic. The results of this study support the interpretation about possible relations of the Afghan Central Blocks to the southern margin of Eurasia during the evolution of Para‐ and Neotethys.

中文翻译：

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陆块逐渐增加而形成的多阶段变质作用，例如西兴都库什山脉

西印度教库什山脉的基底岩石保留了沿太古代—元古代的阿富汗中部地区与阿富汗—塔吉克地块之间的边界发生的多次变质和岩浆事件的证据。为了验证不同的变质阶段或事件，研究了变质基底岩石中的矿物结构和相平衡及其与岩浆事件的年龄关系。三叠纪兴都库什花岗岩岩基岩和小白垩纪和渐新世花岗岩岩侵入了四方带的片麻岩和辉长岩和角闪石透镜（假定其变质为元古代）。新的独居石数据证实了三叠纪岩基热套印的年龄（210-170 Ma）。三叠纪和白垩纪的花岗岩和周围的基底岩石都经历了随后的变质作用，直至形成了露山石-闪石岩相。这种变质的程度在与喀布尔地块的接触处向南增加，而喀布尔地块则从南部向西兴都库什山脉提供支撑。通过Pb-Th分析获得的早中新世年龄是在该地区比渐新世花岗岩更近或稍年轻的菱铁矿和褐铁矿。喀布尔地块边界附近的白垩纪变质闪长闪长岩含有可能来自喀布尔地块的新古纪粒状岩相基底的粒状花岗岩。多阶段变质和岩浆演化将兴都库什山脉带划分为自古生代以来一直活跃的长期缝合带。