| 南阿尔金-柴北缘高压-超高压变质带研究进展、问题及挑战 |
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| 引用本文： | 张建新,孟繁聪,Mattinson C G.南阿尔金-柴北缘高压-超高压变质带研究进展、问题及挑战[J].高校地质学报,2007,13(3):526-545. |
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| 作者姓名： | 张建新 孟繁聪 Mattinson C G |
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| 作者单位： | 1. 中国地质科学院,地质研究所,北京,100037
2. Department of Geological & Environmental Sciences,Stanford University,Stanford CA 94305-2115 U S A. |
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| 基金项目： | 国家自然科学基金项目(40472102,40272095)，中国地质调查局地质调查项目(1212010611811)，国土资源部百名优秀青年人才计划资助 |
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| 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。
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| 关 键 词： | 南阿尔金—柴北缘 HP/UHP变质带 HP/UHP变质单元 多阶段俯冲 |
| 文章编号： | 1006-7493（2007）03-0526-20 |
| 修稿时间： | 2007-06-03 |
Progress, Controversies and Challenge of Studies on South Altyn Tagh-North Qaidam HP/UHP Metamorphic Belt |
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| ZHANG Jian-xin,MENG Fan-cong,Mattinson C G.Progress, Controversies and Challenge of Studies on South Altyn Tagh-North Qaidam HP/UHP Metamorphic Belt[J].Geological Journal of China Universities,2007,13(3):526-545. |
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| Authors: | ZHANG Jian-xin MENG Fan-cong Mattinson C G |
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| Institution: | 1. Institute of Geology, CAGS, Beijing 100037, China; 2. Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115, U S A |
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| Abstract: | The South Altyn 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 Altyn Tagh sinistral strike- slip fault and splitted into two parts: the South Altyn 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 Altyn Tagh(SAT)-North Qaidam (NQD) region (Fig. 1A). From west to east, they are: the Jianggalesayi eclogite-gneiss 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. |
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| Keywords: | South Altyn Tagh-North Qaidam HP/UHP metamorphic belt HP/UHP metamorphic units multiple subduction |
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