This paper describes a comprehensive geochemical study of basalt–andesite–dacite–rhyolite volcanic association in the Khardung volcanic suite along the northern margin of the Ladakh magmatic arc. This volcanic association is outcropped mainly in the segment of the further north of the Khardung village to Khalsar delineating from the Ladakh magmatic arc by ~2 km thick porphyritic sill. The closed association of basalt–andesite–dacite–rhyolite volcanic within a volcanic suite suggests that these rocks may be genetically inter-related and might have derived from the same parental magma source. Felsic lavas (dacite–rhyolite) show SiO₂ range from 64.75 to 79.11 wt.%, while intermediate lavas (basaltic andesite–andesite) ranges from 50.80 to 51.81 wt.% with mafic lavas (basalt) span from 53.39 to 62.05 wt.%. These volcanic suites show enrichment in LIL elements (Rb, Ba, Th, U, and Pb) and depletion in Nb, P, and Ti, which can be evident in spider diagrams with pronounced to mild Eu negative anomalies in REE patterns. Previous reports on zircon U–Pb ages of the Khardung volcanics range between 60 and 69.7 Ma confirm an upper bound eruption age of this volcanic suite as pre-collision continental arc magmas. Hence, the results of geochemical modelling suggest that the Khardung mafic–intermediate-felsic lavas were generated from the melting of 1–4% spinel and garnet-bearing lherzolite sources. The generated parental magmas were modified by crustal materials during the magma ascent along with fractional crystallization and were metasomatized by slab-derived fluids released from the subducting Neo-Tethyan oceanic crust during the Late Cretaceous to Palaeogene in the northern margin of the Ladakh magmatic arc.

本文描述了拉达克岩浆弧北缘Khardung火山组中玄武岩－安山岩－达克特－流纹岩火山组合的综合地球化学研究。该火山的结露主要出现在Khardung村以北至Khalsar的一段，该岩心从Ladakh岩浆弧划定了约2 km厚的斑岩台槛。火山岩中玄武岩-安山岩-达克特-流纹岩火山的紧密联系表明，这些岩石可能在遗传上是相互关联的，并且可能源于同一母岩浆来源。长英质熔岩（闪长岩-流纹岩）显示SiO ₂范围为64.75至79.11 wt。％，而中间熔岩（玄武质安山岩-安山岩）的范围为50.80至51.81 wt。％，镁铁质熔岩（玄武岩）的范围为53.39至62.05 wt。％。这些火山岩组显示出LIL元素（Rb，Ba，Th，U和Pb）的富集，以及Nb，P和Ti的耗竭，这在蜘蛛图中很明显，在REE模式中有明显的轻度Eu负异常。先前有关Khardung火山的锆石U–Pb年龄的报道在60至69.7 Ma之间，证实了该火山组的上限喷发年龄为碰撞前的大陆弧岩浆。因此，地球化学模拟的结果表明，Kardung镁铁质-中长质熔岩是由1-4％的尖晶石和含石榴石的锂铁矿源熔融而成。