地学前缘 ›› 2012, Vol. 19 ›› Issue (5): 100-113.

• 论文 • 上一篇    下一篇

华北克拉通北缘崇礼—赤城地区的红旗营子(岩)群： 一套晚古生代的变质杂岩

王惠初,初航,相振群,陆松年,赵凤清,任云伟   

  1. 1. 中国地质调查局 天津地质调查中心， 天津 300170
    2. 中国地质大学(北京) 地球科学与资源学院， 北京 100083
  • 收稿日期:2012-03-01 修回日期:2012-07-08 出版日期:2012-09-10 发布日期:2012-09-10
  • 作者简介:王惠初（1963—），男，博士，研究员，岩石学专业，从事区域地质和前寒武纪地质研究。E-mail：tjwhuichu@163.com
  • 基金资助:

    国家自然科学基金项目（40772120，40902021）；国土资源部地质矿产调查评价专项（1212010911005，1212010711815）

The Hongqiyingzi Group in the ChongliChicheng area, northern margin of the North China Craton：A suite of late Paleozoic metamorphic complex.

  1. 1. Tianjin Center of Geological Survey, China Geological Survey, Tianjin 300170, China
    2. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2012-03-01 Revised:2012-07-08 Online:2012-09-10 Published:2012-09-10

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摘要：

分布在华北克拉通北缘中段崇礼—赤城地区的红旗营子(岩)群主要由变质表壳岩、晚古生代的闪长质—石英闪长质片麻岩和古元古代—新太古代的变质岩残片或残块组成。利用SHRIMP和LAICPMS法对红旗营子(岩)群变质表壳岩的锆石同位素年代学研究表明，变质表壳岩样品中除大量古元古代—新太古代的锆石年龄信息外，还有许多中元古代—晚古生代的锆石，且均有晚古生代甚至早中生代的多阶段变质作用的记录。这些证据表明红旗营子（岩）群并非早前寒武纪岩石建造，而是一套晚古生代的变质杂岩。红旗营子(岩)群周围侵入体的锆石UPb测年表明岩浆作用与变质作用具有较好的相关性，它们与中亚造山带多阶段的俯冲、碰撞造山和后造山伸展事件相关。由于红旗营子杂岩中含有晚古生代退变榴辉岩和变质方辉橄榄岩，这可能意味着华北克拉通北缘的冀北地块在晚古生代早期曾经从华北克拉通上裂开，在中亚造山带古亚洲洋板块俯冲作用的影响下又重新拼合，红旗营子杂岩代表华北克拉通北缘的冀北地块与华北克拉通在晚古生代重新拼合的俯冲碰撞拼贴带。

关键词: 崇礼—赤城地区, 红旗营子（岩）群, 锆石UPb测年, 晚古生代, 变质杂岩

Abstract:

The Hongqiyingzi Group occurred in the ChongliChicheng area, northern margin of the North China craton, was composed of metamorphic supracrustal rocks, Late Paleozoic dioriticquartzdioritic gneisses and the remnants of PaleoproterozoicNeoarchean rocks. The SHRIMP and LAICPMS zircon UPb dating for the Hongqiyingzi metamorphic supracrustal rocks shows that the samples not only contain a large number of the zircon reflecting the PaleoproterozoicNeoarchean and MesoproterozoicLate Paleozoic age information, but also record multiple metamorphic events during the late PaleozoicEarly Mesozoic. The zircon dating result reveals that the Hongqiyingzi Group wasn’t formed in the Paleoproterozoic, but a suite of Late Paleozoic metamorphic complex. The zircon UPb dating for the plutons distributed in the surrounding of the Hongqiyingzi Group indicated the correlation between the Late PaleozoicEarly Mesozoic magmatism and metamorphism, which are related with the multistage subductionsynorogenicpostorogenic events of Central Asian Orogenic Belt. Because the Hongqiyingzi complex contains some Late Paleozoic retrograde eclogites and the metamorphic peridotites (harzburgite) occurring as lenticular enclave in highly deformed gneisses, this may mean that the Northern Hebei Block had separated from the North China Craton in the early stage of the late Paleozoic, and reamalgamated accompanied by the Central Asian Orogene. The Hongqiyingzi complex represent the subductioncollision amalgamating zone between the Nothern Hebei Block and the North China Craton during the late Paleozoic.

Key words: ChongliChicheng area, Hongqiyingzi Group, zircon UPb dating, Late Paleozoic, metamorphic complex