中文摘要：

南阿尔金—柴北缘高压-超高压（HP/UHP）变质带为近10年来所新厘定，它分布在青藏高原北缘，延伸近1000km，被阿尔金断裂分成南阿尔金和柴北缘两部分，以含少量榴辉岩、石榴橄榄岩和含柯石英的片麻岩为特征。根据野外地质观察、岩石组合分析及其岩石学特征，可把南阿尔金—柴北缘HP/UHP变质带划分为6个HP/UHP变质单元，从西向东分别是：江尕勒萨依榴辉岩-片麻岩单元（JSU）；巴什瓦克石榴橄榄岩-高压麻粒岩单元（BWU）；鱼卡—落凤坡榴辉岩-片麻岩（片岩）单元（YLU）；绿粱山石榴橄榄岩-高压麻粒岩单元（LLU）；锡铁山榴辉岩-片麻岩单元（XTU）；都兰榴辉岩-片麻岩单元（DLU）。研究显示，6个HP/UHP变质单元在岩石组合、形成的温度压力条件及变质演化历史等方面存在明显差异；榴辉岩相变质时代变化在420～500Ma之间，可能反映了早古生代沿南阿尔金—柴北缘HP/UHP变质带的多阶段或穿时性的俯冲作用。

英文摘要：

The South Ahyn Tagh （SAT）-North Qaidam （NQD） HP/UHP metamorphic belt extends approximately 1000 km along the northern margin of the Tibetan Plateau, and is truncated by the Ahyn Tagh sinistral strikeslip fault and splitted into two parts： the South Ahyn Tagh region and the North Qaidam region. Based on rock associations, petrologic criteria and the field relationships, six HP/UHP metamorphic units can be distinguished in the South Ahyn eclogite-gneiss Tagh （ SAT ） -North Qaidam （NQD） region （Fig. 1A）. From west to east, they are： the Jianggalesayi unit （JSU）, the Bashiwake garnet peridotite-high pressure granulite unit （BWU）, the Yuka eclogite- gneiss （schist） unit （YLU）, the Luliangshan garnet peridotite-gneiss unit （LLU）, the Xitieshan eclogite-gneiss unit （XTU） and the Dulan eclogite-gneiss unit （DLU）. The geological relationship, petrology and geochronology indicate that these six HP/UHP metamorphic units have different rock associations, and underwent different p-T conditions and metamorphic histories. Geochronologyical dating for these eclogite-facies metamorphics yields ages between 500 and 420 Ma. This implies that a possible multiple or disachronous subduction took place along the SAT-NQD HP/ UHP metamorphic belt.