We have dated the South Delhi orogeny, Aravalli-Delhi Mobile Belt (ADMB), NW India, using the tectonic fabric, geochemistry, and zircon-monazite geochronology as the proxies. The South Delhi Terrane (SDT), a passive margin domain in the ADMB, consists of multiply deformed (D₁–D₄) greenschist facies rocks and several granite plutons. The D₁ deformation is characterized by pervasive isoclinal recumbent F₁ fold and axial planar tectonometamorphic fabric, S₁, developed in all rock types. The S₁ minerals belong to peak greenschist facies metamorphism, M₁, suggesting syntectonic nature of M₁ with D₁. The age of the D₁-M₁ is constrained by the syncollisional peralkaline S type Sewariya granite which is characterized by magmatic/submagmatic fabric (S_m) coplanar with the S₁. The margin of the pluton is turned into quartzofeldspathic gneiss carrying the evidence of high temperature deformation. The age of Sewariya granite is estimated at ca. 878 Ma by zircon geochronology. The D₁-M₁ is further constrained by monazite geochronology of the mica schist at ca. 865–846 Ma. The other granite plutons and metarhyolite are pre-D₁ and emplaced at ca. 992–946 Ma. The D₂ deformation produced NE-SW trending open upright F₂ folds coaxial with the F₁, and northwesterly vergent F₂–axial planar thrusts. Monazite geochronology constrains the D₂ at ca. 811–680 Ma. The D₃ is characterized by small to large scale NW-SE folds, and the D₄ by faults and fractures marking the brittle deformation in the rocks. The D₄ is constrained by monazite geochronology at ca. 588–564 Ma. There are upper amphibolitic tectonic slivers along the D₂-Phulad thrust, belonging to the pre-Delhi rocks, which show ca. 1,638 Ma metamorphism age. From the above study, it is suggested that the South Delhi orogeny belongs to ca. 878–680 Ma marking the final amalgamation of Marwar Craton with the rest of India. This overlaps the early phase of the Pan-African orogeny (900–630 Ma). The brittle deformation, D₄, coincides with Kuunga orogeny (650–500 Ma). Our study implies that India, like other continents in the East Gondwana, underwent amalgamation of internal blocks until the late part of the Neoproterozoic.

我们用构造构造，地球化学和锆石独居石年代学作为代理，对印度西北部的南德里造山带，阿拉瓦利-德里移动带（ADMB）进行了测年。南德里地形（SDT）是ADMB中的被动边缘域，由多次变形（D ₁ -D ₄）绿片岩相岩石和几个花岗岩岩体组成。D ₁变形的特征是在所有岩石类型中普遍存在等斜卧摆F ₁折叠和轴向平面构造变质织物S ₁。S ₁矿物属于峰值绿片岩相变质M ₁，表明M ₁与D _1的构造特征。D ₁ -M _1的年龄受共生的过碱性S型Sewariya花岗岩的约束，该花岗岩的特征是与S ₁共面的岩浆/亚岩浆织物（S _m）。lu的边缘变成石英长石片麻岩，带有高温变形的迹象。Sewariya花岗岩的年龄估计为。878 Ma（锆石年代学）。D ₁ -M ₁进一步受到云母片岩在20 _℃左右的独居石年代学的限制。865–846马。其他花岗岩plutons和变石为pre-D ₁并放置在ca处。992–946马。D ₂变形产生NE-SW趋势开放立柱F ₂与F ₁同轴折叠，并向西北呈F ₂轴向平面推力。独居石年代学将D ₂约束在约₂。811–680马。D ₃的特征是从小到大的NW-SE褶皱，D _4的特征是断层和裂缝，标志着岩石的脆性变形。D ₄受独居石年代学的约束，大约在。588–564马里。沿D _2处有上两栖构造条-Phulad推力，属于前德里岩石，显示约 1638 Ma变质年龄。从以上研究可以看出，南德里造山带属于约。878–680 Ma标志着Marwar Craton与印度其他地区的最终合并。这与泛非造山运动的早期阶段（900-630 Ma）重叠。脆性变形D ₄与Kuunga造山运动（650-500 Ma）一致。我们的研究表明，印度与东冈瓦纳的其他大陆一样，经历了内部块体的融合，直到新元古代为止。