大陆板片-地幔相互作用:来自大别造山带碰撞后安山质火山岩的地球化学证据

赵子福; 代富强; 陈启

doi:10.3799/dqkx.2019.244

大陆板片-地幔相互作用:来自大别造山带碰撞后安山质火山岩的地球化学证据

doi: 10.3799/dqkx.2019.244

赵子福^1,2, ,,
代富强^1,3,
陈启¹

1.
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
2.
中国科学院比较行星学卓越创新中心, 安徽合肥 230026
3.
中国科学院广州地球化学研究所同位素地球化学国家重点实验室, 广东广州 510640

基金项目:

国家“973”计划项目 2015CB856102

详细信息

作者简介:
赵子福(1973-), 男, 教授, 博士生导师, 地球化学专业

中图分类号: P597
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出版历程
- 收稿日期: 2019-09-02
- 刊出日期: 2019-12-15

Continental Slab-Mantle Interaction: Geochemical Evidence from Post-Collisional Andesitic Rocks in the Dabie Orogen

Zhao Zifu^{1,2
,
,},
Dai Fuqiang^1,3,
Chen Qi¹

1.
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
2.
Center for Excellence in Comparative Planetology, Chinese Academy of Sciences, Hefei 230026, China
3.
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

摘要

摘要: 俯冲到地幔深度的地壳物质不可避免地在板片-地幔界面与地幔楔发生相互作用，由此形成的超镁铁质交代岩就是造山带镁铁质火成岩的地幔源区.因此，造山带镁铁质火成岩为研究俯冲地壳物质再循环和壳-幔相互作用提供了重要研究对象.为了揭示俯冲陆壳物质再循环的机制和过程，对大别造山带碰撞后安山质火山岩开展了元素和同位素地球化学研究.这些安山质火山岩的SIMS锆石U-Pb年龄为124±3~130±2 Ma，表明其形成于早白垩世.此外，残留锆石的U-Pb年龄为中新元古代和三叠纪，分别对应于大别-苏鲁造山带超高压变火成岩的原岩年龄和变质年龄.它们具有岛弧型微量元素特征、富集的Sr-Nd-Hf同位素组成，以及变化的且大多不同于正常地幔的锆石δ¹⁸O值.这些元素和同位素特征指示，这些安山质火山岩是交代富集的造山带岩石圈地幔部分熔融的产物.在三叠纪华南陆块俯冲于华北陆块之下的过程中，俯冲华南陆壳来源的长英质熔体交代了上覆华北岩石圈地幔楔橄榄岩，大陆俯冲隧道内的熔体-橄榄岩反应产生了富沃、富集的镁铁质地幔交代岩.这种地幔交代岩在早白垩世发生部分熔融，就形成了所观察到的安山质火山岩.因此，碰撞造山带镁铁质岩浆岩的地幔源区是通过大陆俯冲隧道内板片-地幔相互作用形成的，而加入地幔楔中长英质熔体的比例决定了这些镁铁质岩浆岩的岩石化学和地球化学成分.
- 安山岩 /
- 碰撞造山带 /
- 板片-地幔相互作用 /
- 熔体-橄榄岩反应 /
- 俯冲隧道 /
- 地球化学
Abstract: Crustal material subducted to mantle depths inevitably interacted with the mantle wedge at the slab-mantle interface. This may generate a variety of ultramafic metasomatites that served as the mantle source of mafic igneous rocks in collisional orogens. Therefore, mafic igneous rocks in collisional orogens are the important target to study the recycling of subdcuted crustal materials and its associated crust-mantle interaction. In order to decipher the mechanism and processes of the recycling of subducted continental crustal materials, a combined study of element and isotope geochemistry was performed for post-collisional andesitic volcanics from the Dabie orogen, China. SIMS zircon U-Pb ages for these volcanic rocks are 124±3 to 130±2 Ma, indicating that they formed at Early Cretaceous. In addition, the relict zircons have Middle Neoproterozoic and Triassic U-Pb ages, respectively, corresponding to the ages of protolith formation and ultrahigh-pressure metamorphism (UHP) for UHP metaigenous rocks in the Dabie-Sulu orogenic belt. They have island-arc basalts (IAB)-like trace-element patterns, enriched Sr-Nd-Hf isotope compositions, and variable zircon δ¹⁸O values mostly different from the normal mantle. These element and isotope features indicate that the post-collisional andesitic volcanics are the products of partial melting of metasomatically enriched orogenic lithospheric mantle. During the Triassic subduction of the South China block (SCB) beneath the North China block (NCB), the overlying NCB lithospheric mantle wedge peridotite was metasomatized by felsic melts originated from the subdcuted SCB continental crust, the melt-peridotite reaction in the continental subduction channel generated fertile and enriched metasomatites of mafic composition. Partial melting of such metasomatites in the Early Cretaceous gave rise to these andesitic volcanics. Therefore, the mantle sources for post-collisional mafic igneous rocks in collisional orogens would be generated by the slab-mantle interaction in continental subduction channel, and the lithochemical and geochemical composition of these mafic rocks is dictated by the proportion of felsic melts incorporating into the mantle wedge.
- andesitic rocks /
- collisional orogens /
- slab-mantle interaction /
- melt-peridotite reaction /
- subduction channel /
- geochemistry

HTML全文

图 1 大别造山带碰撞后安山质火山岩锆石δ¹⁸O值(a)和残留锆石U-Pb年龄(b)统计图

据Dai et al.(2016)；正常地幔锆石δ¹⁸O为5.3‰±0.3‰(Valley et al., 1998)

Fig. 1. Histograms of zircon δ¹⁸O values (a) and relict zircon U-Pb ages (b) for post-collisional andesitic rocks in the Dabie orogen

下载: 全尺寸图片幻灯片

图 2 大别造山带碰撞后安山质火山岩全岩Na₂O+K₂O-SiO₂(TAS)图(a)、Sr-Nd同位素组成图(b)、稀土(c)和微量元素(d)分布图

据Dai et al., (2016)；LM.华北岩石圈地幔；CDB.中大别超高压变质岩；NDB.北大别超高压变质岩；PCMI.大别造山带碰撞后镁铁质-超镁铁质侵入岩；PCG.大别造山带碰撞后花岗岩

Fig. 2. Plots of whole-rock Na₂O+K₂O-SiO₂ (TAS) (a), Sr-Nd isotope compositions (b), REE (c) and trace element (d) distribution patterns for post-collisional andesitic rocks in the Dabie orogen

下载: 全尺寸图片幻灯片

图 3 大陆俯冲隧道板片-地幔相互作用和大别造山带碰撞后安山质火山作用示意

a.三叠纪，俯冲华南陆壳衍生的长英质熔体与上覆华北岩石圈地幔楔橄榄岩反应，产生镁铁质-超镁铁质地幔交代岩；b.早白垩世，这些交代岩发生部分熔融，形成碰撞后安山质火山岩和镁铁质-超镁铁质侵入岩；UM.超镁铁质交代岩，MM.镁铁质交代岩.据Dai et al.(2016)

Fig. 3. Schematic cartoons illustrating the slab-mantle interaction in continental subduction channel and the post-collisional andesitic volcanism in the Dabie orogen, East-Central China

下载: 全尺寸图片幻灯片

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