| 南黄海千里岩岛榴辉岩变质演化P-T-t轨迹及其构造意义 |
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| 引用本文： | 李敏,韩宗珠,许红,赵广涛,张贺,来志庆.南黄海千里岩岛榴辉岩变质演化P-T-t轨迹及其构造意义[J].地球科学,2014,39(9):1289-1300. |
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| 作者姓名： | 李敏 韩宗珠 许红 赵广涛 张贺 来志庆 |
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| 作者单位： | 1.中国海洋大学海洋地球科学学院, 山东青岛 266100 |
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| 基金项目： | 国家专项(No．GZH201200510-02)；国家重点基础研究发展计划“973”项目(No．2012CB956004)． |
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| 摘 要： | 南黄海千里岩岛榴辉岩对进一步深入完善大别-苏鲁造山带的研究具有重要意义.岩相学和矿物学研究显示榴辉岩主要经历了俯冲进变质(Ⅰ)、峰期榴辉岩相变质(Ⅱ)、角闪岩相退变质(Ⅲ)和绿片岩相退变质(Ⅳ)阶段.各阶段的温压条件分别为: Ⅱ阶段T=806.3 ℃, P=3.32 GPa; Ⅲ阶段T=658.68 ℃, P=0.78 GPa; Ⅳ阶段T＜550 ℃, P＜0.3 GPa.锆石SHRIMP U-Pb测年指示千里岩榴辉岩的原岩形成于新元古代(约747±19 Ma), 超高压变质作用发生在早三叠世(约241.1±1.5 Ma), 角闪岩相退变质发生在三叠纪末(约205.8 Ma).在此基础上, 建立了千里岩岛榴辉岩的P-T-t演化轨迹, 反映出榴辉岩经历了2个折返阶段.这一P-T-t轨迹整体上与苏鲁地区榴辉岩类似, 指示该区所在的千里岩隆起区是苏鲁造山带在海区的延伸.
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| 关 键 词： | 南黄海 榴辉岩 矿物化学 P-T-t轨迹 苏鲁造山带 |
| 收稿时间： | 2014-01-08 |
Metamorphic P-T-t Path of Eclogites from Qianliyan Island in the South Yellow Sea and Its Tectonic Implications |
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| Li Min,Han Zongzhu,Xu Hong,Zhao Guangtao,Zhang He,Lai Zhiqing.Metamorphic P-T-t Path of Eclogites from Qianliyan Island in the South Yellow Sea and Its Tectonic Implications[J].Earth Science-Journal of China University of Geosciences,2014,39(9):1289-1300. |
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| Authors: | Li Min Han Zongzhu Xu Hong Zhao Guangtao Zhang He Lai Zhiqing |
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| Abstract: | The eclogites in Qianliyan Island, the South Yellow Sea, is important for conducting further research of Dabie-Sulu Orogen. Petrographic and mineralogic studies reveal four main metamorphic stages, including prograde (Stage Ⅰ), eclogite-facies (Stage Ⅱ) metamorphism, and amphibolite-(Stage Ⅲ), greenschist-facies (Stage Ⅳ) retrograde metamorphisms. The metamorphic P-T conditions are estimated as follows: Stage Ⅱ, T=806.3 ℃, P=3.32 GPa; Stage Ⅲ, T=658.68 ℃, P=0.78 GPa; Stage Ⅳ, T < 550 ℃, P < 0.3 GPa. The SHRIMP U-Pb datings of the zircons from eclogites show that the protoliths were formed in Neoproterozoic (about 747±19 Ma), the UHP metamorphism happened in Early Triassic (about 241.1±1.5 Ma), and the amphibolite-facies retrograde metamorphism happened in the end of Triassic (about 205.8 Ma). Using the data mentioned above, metamorphic PTt path of eclogites is constructed. The PTt path shows that the eclogites experienced 2 stages of exhumation and reveals that the Qianliyan uplift is the extension of Sulu Orogen in the South Yellow Sea. |
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| Keywords: | the South Yellow Sea eclogite mineral chemistry P-T-t path Sulu orogen tectontics Metamorphic rocks |
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