榴辉岩类捕虏体的地球化学特征及其构造意义——来自徐淮地区中生代侵入杂岩中的信息

王清海; 许文良; 王冬艳; 林景仟; 高山

榴辉岩类捕虏体的地球化学特征及其构造意义——来自徐淮地区中生代侵入杂岩中的信息

1.
吉林大学地球科学学院, 吉林长春 130061
2.
中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

国家自然科学基金项目 40172030

国家自然科学基金项目 40133020

详细信息

作者简介:
王清海(1962-), 男, 博士, 主要从事岩石学研究.E-mail: sjdz@jlu.edu.cn

中图分类号: P581;P588
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出版历程
- 收稿日期: 2005-02-16
- 刊出日期: 2005-07-25

Geochemical Characteristics of Eclogite Xenoliths in Mesozoic Intrusive Complex from Xu-Huai Area and Its Tectonic Significance

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 利用X-荧光光谱和ICPMS测试了徐淮地区中生代侵入杂岩中榴辉岩类捕虏体的组成.主量元素为: SiO₂的含量为40.88%~47.82%, TiO₂为0.78%~2.00%, Al₂O₃为11.72%~16.08%, FeO (全铁) 为12.77%~20.29%, MgO为5.23%~11.47%, CaO为7.80%~13.11%, Na²O为0.30%~2.09%, K₂O为0.13%~0.69%.榴辉岩类捕虏体具有较低的稀土元素丰度(Σ_REE= (34.26~115.51) ×10^-6), 且具有明显的Nb、P、Zr和Ti的负异常.捕虏体的I(Sr) 和ε(Nd, t) 值分别为0.7042~0.7085和-5.77~2.99 (L-4为-13.05).上述特征暗示本区榴辉岩类捕虏体的原岩具有岛弧拉斑玄武岩的特征.榴辉岩类捕虏体Nd的模式年龄和其中锆石SHRIMPUPb年龄显示它们应属于华北克拉通的基底物质.华北克拉通基底物质发生的榴辉岩相变质作用暗示中生代早期华北克拉通东部曾存在一次重要的陆壳加厚过程, 这应与扬子克拉通沿北西或北西西方向深俯冲于华北克拉通之下有关.
- 徐淮地区 /
- 中生代 /
- 榴辉岩 /
- 捕虏体 /
- 地球化学 /
- 构造意义
Abstract: Using X-fluorecence spectrum and ICP-MS tests eclogite xenoliths components in Mesozoic intrusive complex from Xu-Huai area.The major element components are as following, SiO₂: 40.88%~47.82%, TiO₂: 0.78%~2.00%, Al₂O₃: 11.72%~16.08%, FeO (total iron) : 12.77%~20.29%, MgO: 5.23%~11.47%, CaO: 7.80%~13.11%, Na₂O: 0.30%~2.09%, K₂O: 0.13%~0.69%.Eclogite xenoliths have a relatively low REE abundance [Σ_REE= (34.26~115.51) ×10^-6] and obvious Nb, P, Zr and Ti negative anomaly.The I(Sr) and ε(Nd, t) values of eclogite xenoliths are 0.704 2~0.708 5 and-5.77~2.99 (L-4:-13.05) respectively.These characteristics indicate that their protoliths could be the tholeiitic rocks formed in an island arc environment.The Nd model ages and zircon SHRIMP U-Pb dating of the eclogite xenoliths suggest that they should belong to the basement of the North China craton (NCC).The eclogite phase metamorphism of the basement of the NCC implies that an important continental crustal thickening could have taken place in the eastern part of the NCC in early Mesozoic, which could be attributed to the deep subduction of the Yangtze craton beneath the NCC in an NW or NWW direction.
- Xu-Huai area /
- Mesozoic /
- eclogite /
- xenolith /
- geochemistry /
- tectonic significance

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图 1 徐淮地区中生代侵入杂岩体分布

1.高温(超) 高压变质带; 2.低温高压变质带; 3.秦岭-桐柏深变质杂岩; 4.北淮阳浅变质杂岩; 5.古生代; 6.断层; 7.闪长斑岩和二长闪长斑岩岩体

Fig. 1. Distribution of Mesozoic intrusive complex in Xu-Huai area

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图 2 玄武岩的Ti-V判别图

Fig. 2. Ti-V distinguishing diagram of basalts

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图 3 榴辉岩类捕虏体的原始地幔标准化痕量元素蛛网

1.榴辉岩(603-2-2, B1-10);2.石榴石辉石岩(L-4, 603-2-1, J-21, J-22, JG1-8, JG2-11, JG2-22)

Fig. 3. Primitive mantle-normalized trace element spider diagram of eclogite xenoliths

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图 4 榴辉岩类捕虏体的稀土元素球粒陨石标准化配分模式

1.榴辉岩(603-2-2, B1-10);2.石榴石辉石岩(L-4, 603-2-1, J-21, J-22, JG1-8, JG2-11, JG2-22)

Fig. 4. Chondrite-normalized REE patterns of eclogite xenoliths

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图 5 榴辉岩类捕虏体的I (Sr)-ε(Nd, t) 关系

1.榴辉岩(603-2-2, B1-10);2.石榴石辉石岩(L-4, 603-2-1, J-21, J-22, JG1-8, JG2-11, JG2-22)

Fig. 5. I (Sr) vs.ε(Nd, t) diagram of eclogite xenoliths

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表 1 徐淮地区侵入杂岩中榴辉岩类捕虏体的主量(%)、微量元素(10^-6) 和Sr-Nd同位素组成

Table 1. Major, trace elements and Sr-Nd isotopic compositions of eclogite xenoliths in Mesozoic intrusive complex

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