威海地区超高压变质花岗片麻岩锆石U-Pb定年和氧同位素研究

唐俊; 郑永飞; 吴元保; 龚冰

威海地区超高压变质花岗片麻岩锆石U-Pb定年和氧同位素研究

中国科学院壳幔物质与环境重点实验室，中国科学技术大学地球和空间科学学院，安徽合肥 230026

基金项目:

国家自然科学基金项目 40334036

中国科学院知识创新工程项目 KZCX3-SW-141

详细信息

作者简介:
唐俊(1965一)，男，博士，地球化学专业

通讯作者:
郑永飞，Email：yfzheng@ustc.edu.crl

中图分类号: P597
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出版历程
- 收稿日期: 2005-07-21
- 刊出日期: 2005-11-25

A Study of Zircon U-Pb Dating and Oxygen Isotopes in UHP Granitic Gneiss from the Weihai Region in Northeast Sulu

CAS Key Laboratory of Crust-Mantle Materials and Environments．School of Earth and Space Sciences．University of Science and Technology of China，Hefei 230026，China

摘要

摘要: 在苏鲁超高压变质带东北端山东威海地区皂埠镇发现锆石δ¹⁸O值低至-7.8‰左右的花岗片麻岩, 与前人在苏鲁超高压变质带西南端江苏东海青龙山地区发现的锆石δ¹⁸O值为-7‰~-9‰左右的花岗片麻岩一致.对这些低δ¹⁸O值花岗片麻岩进行了锆石SHRIMP法UPb定年和系统的激光氟化法矿物氧同位素分析, 结果对低δ¹⁸O值锆石成因和花岗片麻岩的原岩性质提供了制约.研究得到: (1) 这些低δ¹⁸O值锆石以新元古代岩浆锆石为主, 但部分岩浆锆石在印支期超高压变质作用过程中发生了不同程度的重结晶作用.δ¹⁸O值为-7.08‰的岩浆核锆石UPb定年得到的花岗片麻岩原岩谐和年龄和不一致线上交点年龄分别为(760±49) Ma和(751±27) Ma, 变质谐和年龄和不一致线下交点年龄分别为(232±4) Ma和(241±33) Ma, 指示其原岩为新元古代花岗岩并经历了印支期变质作用; (2) 锆石δ¹⁸O值在局部范围内变化于-7.76‰~5.40‰之间, 低δ¹⁸O值岩浆锆石表明它们是从新元古代低δ¹⁸O值岩浆中直接结晶形成, 锆石δ¹⁸O值的局部变化表明其原岩岩浆的氧同位素组成具有不均一性, 指示低δ¹⁸O值岩浆源区物质曾经在地表与极度亏损¹⁸O的大气降水发生过不同程度的高温水岩反应; (3) 低δ¹⁸O值花岗片麻岩在印支期板块俯冲和折返过程中基本没有与外部发生显著的氧同位素交换, 在退变质作用过程中花岗片麻岩内部缓冲流体对原岩岩浆锆石的δ¹⁸O值影响不大.威海皂埠镇地区和东海青龙山地区的花岗片麻岩在原岩时代、变质时代和氧同位素组成等方面基本相同, 指示它们应具有相同的原岩性质, 并经历了相同的变质作用和水岩相互作用过程.因此, 极度亏损¹⁸O的新元古代双峰式基性-酸性岩浆岩可能分布于整个大别-苏鲁造山带.
- 苏鲁造山带 /
- 超高压变质岩 /
- 锆石UPb定年 /
- 氧同位素 /
- 原岩性质
Abstract: Extremely ¹⁸O-depleted zircons from granitic gneisses, with δ¹⁸O values as low as -7.8‰, were found in the Zaobuzhen area in the Weihai region, at the northeastern end of the Sulu orogen. SHRIMP zircon U-Pb ages and the oxygen isotope compositions were determined for the Low-δ¹⁸O zircons. CL images reveal that the Low-δ¹⁸O zircons are primarily of igneous origin, but some grains underwent metamorphic recrystallization. The igneous zircons from a granitic gneiss sample yield a concordant U-Pb age of (760±49) Ma and an upper intercepted age of (751±27) Ma, indicating a protolith of Middle Neoproterozoic age. Metamorphic zircons from the same sample yield a concordant U-Pb age of (232±4) Ma and a lower intercepted age of (241±33) Ma, pointing to Triassic UHP metamorphism. Most of the igneous zircons have unusually variable δ¹⁸O values of -7.76‰ to 5.40‰, indicating that the gneiss protolith was intruded as Low-δ¹⁸O magma that was generated by the partial melting of altered rocks, which suffered intensive water-rock interaction with a Low-δ¹⁸O fluid at high temperatures during the Neoproterozoic. The preservation of extreme ¹⁸O-depletion in the zircons suggests that there is no remarkable oxygen isotope exchange between the metagranite and the mantle during the processes of Triassic subduction and exhumation. The protolith nature, metamorphic timing and oxygen isotope compositions of the granitic gneisses in the Weihai region are similar to those of granitic gneisses in the Qinglongshan area in the southwestern part of the Sulu orogenic belt, indicating that the gneisses along the Sulu orogenic belt share the same nature of protolith origin, water-rock interaction and UHP metamorphism. The present study provides tight constraints not only on the origin of extremely ¹⁸O-depleted zircons, but also on the protolith nature of granitic gneisses in the Sulu orogenic belt.
- Sulu orogen /
- UHP metamorphic rocks /
- zircon U-Pb dating /
- oxygen isotope /
- protolith nature

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图 1 胶东地块东部地质简图

Fig. 1. Sketch geological map of the eastern part of Shandong peninsula

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图 2 威海地区皂埠镇花岗片麻岩样品分布

Fig. 2. Sketch map of granitic gneiss sample locality at Zaobuzhen area in the Weihai region, eastern part of the Shandong peninsula

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图 3 威海地区皂埠镇花岗片麻岩显微照片

a.03SD27 (正交偏光), 浅色矿物石英和长石呈他形不规则状, 石英和长石被定向拉长.钾长石发育格子双晶, 部分石英裂隙发育, 具波状消光, 总体具韧性剪切结构特征, 暗色矿物角闪石和黑云母也具有明显的定向性; b.04SD03 (单偏光), 花岗片麻岩中呈定向排列的黑云母, 见有半自形榍石零星分布于黑云母附近.浅色矿物也具有一定的定向性; c.03SD27 (单偏光), 花岗片麻岩中角闪石被黑云母交代, 角闪石和黑云母均定向分布; d.03SD27 (单偏光), 花岗片麻岩中零星分布于长石附近的红褐色石榴石, 石榴石内部见有来自于花岗片麻岩中残留的石英包裹体, 表明石榴石应该是在变质过程中形成.矿物符号: Qz.石英; Kfs.钾长石; Pl.斜长石; Bi.黑云母; Hb.角闪石; Gt.石榴石; Sph.榍石

Fig. 3. Photomicrograph of granitic gneiss at Zaobuzhen area in the Weihai region, eastern part of the Shandong peninsula

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图 4 威海地区皂埠镇花岗片麻岩锆石CL照片

Fig. 4. CL images of zircons from granitic gneiss at Zaobuzhen in the Weihai region

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图 5 威海地区皂埠镇花岗片麻岩锆石U-Pb谐和曲线图

Fig. 5. U-Pb concordant diagram of zircons from granitic gneiss at Zaobuzhen in the Weihai region

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图 6 威海地区皂埠镇花岗片麻岩石英-矿物对δ-δ图解

Fig. 6. δ-δ plot between minerals and quartz from granitic gneisses at Zaobuzhen in the Weihai region

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图 7 胶东地块东部新元古代花岗片麻岩锆石δ¹⁸O值直方图

Fig. 7. Histogram of the oxygen isotope composition for zircons from the Neoproterozoic granitic gneisses in the eastern part of the Shandong peninsula

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图 8 胶东地块东部新元古代花岗片麻岩锆石δ¹⁸O值与全岩SiO₂含量相关图

Fig. 8. Diagram of relationship between zircon δ¹⁸O value and whole-rock SiO₂ content for the Neoproterozoic granitic gneisses in the eastern part of the Shandong peninsula

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图 9 威海地区皂埠镇花岗片麻岩氧同位素剖面

Fig. 9. Profile for the oxygen isotope compositions of minerals from the granitic gneisses at Zaobuzhen in the Weihai region

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表 1 海地区皂埠镇花岗片麻岩03SD27锆石SHRIMP U-Pb同位素数据

Table 1. SHRIMP zircon U-Pb isotope data for granitic gneiss 03SD27 at Zaobuzhen in the Weihai region

表 2 海地区皂埠镇花岗片麻岩全岩和单矿物氧同位素组成及温度

Table 2. Oxygen isotope compositions of mineral separates and whole rocks of granitic gneiss at Zaobuzhen in Weihai region and estimated temperatures

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