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首页> 外文期刊>Journal of Asian earth sciences >Zircon and titanite behaviors during partial melting of metabasite in the post-collisional stage: Constraints from garnet pyroxenite in the Dabie orogen, China
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Zircon and titanite behaviors during partial melting of metabasite in the post-collisional stage: Constraints from garnet pyroxenite in the Dabie orogen, China

机译：在碰撞后阶段中偏摩擦部分熔化过程中的锆石和钛铁矿行为：大虾奥根根的石榴石Pyroxenite的限制

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摘要

An integrated study of petrology, mineral inclusions, U-Pb ages and trace elements in zircon and titanite was carried out for garnet pyroxenites from the Dabie orogen, China. The results provide not only geochemical constraints on zircon and titanite behaviors during partial melting but also petrological insights into anatectic reworking of ultrahigh-pressure metamorphic eclogites in the collisional orogen. The target garnet pyroxenites were transformed from ultrahigh-pressure eclogites produced by the continental deep subduction in the Triassic, and underwent granulite facies metamorphic superimposition in the early Cretaceous under P-T conditions of 746-837 degrees C and 0.8-1.2 GPa, followed by amphibolite facies retrogression at 737-791 degrees C and 0.7 GPa. Both zircon and titanite contain two types of metamorphic domains at ca. 131 Ma based on CL images, mineral inclusions, REE patterns and trace element variations. Peritectic zircon domains (D3) contain abundant multiphase crystal inclusions of quartz and K-feldspar and exhibit variably high Nb, Ta, Th, U, P, REE and Y contents. In contrast, anatectic zircon domains (D4) are relatively free of crystal inclusion and display variably low Nb, Ta, Th, U, P, REE and Y contents. Metamorphic and peritectic titanite domains are clearly distinct by a series of differences in petrological and geochemical compositions. There are reduced Hf-176/Hf-177 ratios for both peritectic and anatectic zircon domains, indicating involvement of Hf-rich minerals in the anatexis of the ancient crust. Therefore, the discrimination between the polygenetic zircon and titanite domains in the metabasites not only provides a powerful means to decipher the nature of crustal anataxis in the collisional orogen, but also places constraints on the formation mechanism of metamorphic, peritectic and anatectic minerals.
机译：从Dabie Orogen，Zircon和Titanite中的岩石学，矿物质夹杂物，U-Pb年龄和微量元素进行综合研究，从中国大草奥根根进行石榴石曲线进行。结果不仅提供了在部分熔化期间对锆石和二钛矿行为的地球化学约束，而且在碰撞造山菌中的超高压变质eNlogites中的岩石学识别。目标石榴石曲率从三叠系中的大陆深层俯冲产生的超高压eClogites转化，并且在746-837℃的PT条件下，在早期白垩纪中的变质叠加在746-837℃和0.8-1.2GPa，随后是倒置的相片在737-791摄氏度和0.7GPa的倒退。锆石和钛铁矿均在加利福尼亚州含有两种类型的变质域。基于CL图像，矿物质夹杂物，REE模式和痕量元素变异的131 mA。包晶锆石域（D3）包含石英和K-feldspar的丰富的多相晶体夹杂物，并表现出可变的高Nb，Ta，Th，U，P，Ree和Y内容。相反，空中锆石域（D4）相对不含晶体夹杂物，并且显示可变低Nb，Ta，Th，U，P，Ree和Y内容。变质和包晶二岩石结构域明显独立于岩石和地球化学组合物的一系列差异。对囊泡和一种阴影锆石域的HF-176 / hF-177比率降低，表明富含HF的矿物质患者在古代地壳的肛门泻。因此，代谢物中的多基因锆石和二氧化钛结构域之间的歧视不仅提供了破译局部orgen中的地壳亚麻的性质的强大方法，而且还给予变质，包晶和异形矿物质的形成机制。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第1期|104615.1-104615.17|共17页
  • 作者

    Wang Ling; Gao Xiao-Ying; Chen Ren-Xun; Zheng Yong-Fei;

  • 作者单位

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China;

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China|Chinese Acad Sci Ctr Excellence Comparat Planetol Hefei 230026 Peoples R China;

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China|Chinese Acad Sci Ctr Excellence Comparat Planetol Hefei 230026 Peoples R China;

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China|Chinese Acad Sci Ctr Excellence Comparat Planetol Hefei 230026 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Zircon; Titanite; Partial melting; Garnet pyroxenite; Collisional orogen;

    机译：锆石;钛铁矿;部分熔化;石榴石Pyroxenite;碰撞造山虫;

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