The North Qaidam orogenic belt (NQOB) is generally considered to be an early Paleozoic ultrahigh pressure metamorphic belt, but increasing reports of the Neoproterozoic magmatic and metamorphic events indicate that the NQOB probably also experienced the assembly of the Rodinia. However, the Neoproterozoic evolution of the NQOB is not well constrained due to the sparse records and ambiguous nature of the Neoproterozoic metamorphism. In order to reveal the multi-orogenic history of the NQOB, an integrated study of petrology, phase equilibrium modelling and geochronology was conducted on an epidote eclogite and host garnet mica schist from the Yuka–Luofengpo terrane. New zircon and monazite UPb ages show that the protolith of the garnet mica schist was deposited during 994–920 Ma and experienced Neoproterozoic (920–915 Ma) and early Paleozoic (451–447 Ma) polyphase metamorphism together with the enclosed eclogite. Relic omphacite inclusions were first identified in garnet and early Paleozoic zircon domains from the garnet mica schist, which provide solid evidence for the early Paleozoic eclogite facies metamorphism of the mica schist. Similar early Paleozoic peak P–T conditions of >27.4 kbar/613–670 °C and 30.2–30.8 kbar/646–655 °C were obtained for the garnet mica schist and enclosed eclogite, respectively, indicating that eclogites and their host paragneisses in this region underwent continental deep subduction as a coherent metamorphic terrane in early Paleozoic. The peak P–T conditions of the Neoproterozoic metamorphism were roughly constrained at 7.7–12.0 kbar and 634–680 °C for the garnet mica schist, based on stability field of mineral inclusions in Neoproterozoic zircons domains in P–T pseudosection, the relic garnet core composition and Ti-in-zircon thermometer. The high thermal gradients (16–37 °C/km) defined by presently our and previously reported P–T conditions indicate that the Neoproterozoic metamorphism likely occurred in continental collision setting at >945–890 Ma. Since the Grenvillian syn-orogenic granitic magmatism and metamorphism (ca. 1.0–0.9 Ga) in the NQOB are much younger than the Grenvillian orogeny in the central part of Rodinia, the Qaidam Block was probably located at the north margin of Rodinia in Neoproterozoic.

北柴达木造山带（NQOB）通常被认为是早古生代超高压变质带，但是新元古代的岩浆和变质事件的报道越来越多，这表明NQOB也可能经历了罗迪尼亚的组装。然而，由于新元古代变质的稀疏记录和模棱两可的性质，NQOB的新元古代演化没有受到很好的限制。为了揭示NQOB的多次造山历史，对来自尤卡-罗峰坡地带的榴辉岩榴辉岩和寄主石榴石云母片岩进行了岩石学，相平衡模型和地质年代学的综合研究。新锆石和独居石U铅的年龄表明，石榴石云母片岩的原石沉积于994-920 Ma，经历了新元古代（920-915 Ma）和早期古生代（451-447 Ma）的多相变质作用以及封闭的榴辉岩。在石榴石云母片岩中的石榴石和早古生锆石域中首次发现了遗留的辉绿岩包裹体，这为云母片岩的早期古生代榴辉岩相变质提供了有力的证据。类似的早期古生代峰对叔> 27.4千巴/ 613-670℃下和条件30.2-30.8千巴/ 646-655°是为石榴石云母片岩和封闭榴，分别得到C，表明榴辉和它们的宿主副片麻岩在该区域在古生代早期经历了大陆深层俯冲，作为相干的变质地层。峰值PT石榴石云母片岩的新元古代变质条件大致被限制在7.7-12.0 kbar和634-680°C，这是根据P-T假剖面中新元古代锆石域中矿物包裹体的稳定性场，遗迹石榴石核心成分和Ti-锆石温度计。通过目前我们的和以前报道的所限定的高的热梯度（16-37℃/公里）对-叔条件指示新元古代变质可能在大陆碰撞设定发生在> 945-890马。由于NQOB的Grenvillian造山作用的花岗岩岩浆作用和变质作用（约1.0–0.9 Ga）比Rodinia中部的Grenvillian造山作用年轻得多，因此Qaidam块可能位于新元古代的Rodinia的北缘。