西大别浒湾高压变质带变沉积岩锆石U-Pb年龄及地质意义

杨赛红; 吴元保; 刘小驰; 汪晶; 彭敏; 焦文放

西大别浒湾高压变质带变沉积岩锆石U-Pb年龄及地质意义

杨赛红¹,
吴元保^{1, 2, ,},
刘小驰¹,
汪晶¹,
彭敏¹,
焦文放¹

1.
中国地质大学地质过程与矿产资源国家重点实验室, 中国地质大学地球科学学院, 湖北武汉 430074
2.
西北大学大陆动力学国家重点实验室, 西北大学地质系, 陕西西安 710069

基金项目:

国家自然科学基金项目 40873043

国家自然科学基金项目 90714010

国家自然科学基金项目 40772042

教育部项目 IRT0441

教育部项目 B07039

教育部项目 NCET-06-0659

详细信息

作者简介:
杨赛红(1983-), 女, 硕士研究生, 主要从事岩石圈地球化学研究

通讯作者:
吴元保, E-mail: cugybwu@yahoo.com

中图分类号: P533
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- 被引次数: 0
出版历程
- 收稿日期: 2008-10-21
- 刊出日期: 2009-01-25

U-Pb Ages of Detrital Zircon from Meta-Sedimentary Rock from the Huwan Shear Zone, Western Dabie Terrain and Their Geological Significance

1.
State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
MOE Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China

摘要

摘要: 西大别山浒湾高压变质带是研究秦岭-大别山-苏鲁造山带演化的关键区域, 但是该地区榴辉岩相变质时间还存在较大争议.本文通过对浒湾变质带熊店附近的一个变沉积岩样品进行LA-ICPMS锆石U-Pb定年和微量元素分析, 来确定该地区榴辉岩相变质作用和碎屑锆石的年龄, 并确定该变质带的演化历史.该样品的变质锆石具有弱分带或无分带、低Th/U比值、重稀土含量低且相对平坦以及无明显的Eu负异常等特征.反映这些变质锆石形成时有石榴石, 而缺乏长石, 其形成对应于榴辉岩相变质作用条件.该样品中变质锆石的²⁰⁶Pb/²³⁸U加权平均值为310±3Ma, 这一年龄代表了该地区榴辉岩相峰期变质作用的时间, 因此浒湾地区榴辉岩相变质作用时间为石炭纪.碎屑岩浆锆石得到了3组近谐和的U-Pb年龄, 其²⁰⁶Pb/²³⁸U年龄变化范围分别为: 400±5Ma~419±5Ma、426±5Ma~449±5Ma以及496±5Ma~524±7Ma, 还有1个颗粒给出了580±7Ma的较老年龄.这些结果表明变沉积岩中的碎屑锆石可能大部分来自于华北板块南缘, 少量来自于扬子板块.
- 浒湾变质带 /
- 榴辉岩 /
- 锆石U-PB年龄 /
- 石炭纪
Abstract: The Huwan high-pressure (HP) metamorphic zone is a key region to investigate the evolution process and timing of the Qinling-Dabieshan-Sulu orogenic belt. However, the timing of eclogite-facies metamorphism in this zone has not been well constrained. In order to constrain the time of eclogite-facies metamorphism, zircons from a metasediment sample HXD98-9 near Xiongdian were selected for LA-ICPMS U-Pb dating and trace element analysis. Metamorphic zircons are characterized by weak or none zoning, low Th/U ratios, low and/or flat HREE patterns, and an insignificantly negative Eu anomaly. These reflect that the metamorphc zircons crystallized with the presence of garnet and the absence of plagioclase feldspar, which occurred in eclogite-facies conditions. The weighted mean ²⁰⁶Pb/²³⁸U age of 310±3 Ma for these metamorphic zircons is thus the best estimated age of the eclogite-faeies metamorphism in this HP metamorphic zone. Three groups of U-Pb age were obtained from the inherited magmatic zircons, ranging of (400±5 Ma)-(419±5Ma), (426±5Ma)-(449±5Ma), and (496±5 Ma)-(524±7 Ma), respectively. One inherited grain has a U-Pb age of 580.7±7.3 Ma. These indicate that the inherited zircons were mostly derived from southern part of the North China block, while some from the Yangtze block.
- Huwan metamorphic zone /
- eclogite-facies metanorphism /
- zircon U-Pb age /
- Carboniferous

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图 1 浒湾地区地质简图及采样点位置

Fig. 1. Geological sketch map showing Huwan shear zone and sample location

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图 2 样品98HXD09中典型锆石的CL照片

Fig. 2. Typical CL images of zircons in sample 98HXD09

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图 3 样品98HXD09锆石U-Pb年龄谐和图

Fig. 3. Concordia U-Pb diagram for zircons from 98HXD09

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图 4 样品98HXD09中锆石稀土元素球粒陨石标准化图

Fig. 4. Chondrite normalized REE pattern of zircons from sample 98HXD09

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表 1 变沉积岩样品98HXD09锆石LA-ICPMS分析点U-Pb同位素测定结果

Table 1. LA-ICPMS zircon U-Pb dating for metase dimentary rock 98HXD09

表 2 变沉积岩样品98HXD09锆石LA-ICPMS分析点微量元素测定结果

Table 2. LA-ICPMS trace element analysis of zircons from sample 98HXD09

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