俯冲隧道内不同深度的壳幔相互作用:地幔楔超镁铁质岩的镁同位素记录

沈骥; 李王晔; 李曙光; 肖益林

doi:10.3799/dqkx.2019.286

Volume 44 Issue 12

Dec. 2019

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Article Navigation > Earth Science > 2019 > 44(12): 4102-4111

Shen Ji, Li Wangye, Li Shuguang, Xiao Yilin, 2019. Crust-Mantle Interactions at Different Depths in the Subduction Channel: Magnesium Isotope Records of Ultramafic Rocks from the Mantle Wedges. Earth Science, 44(12): 4102-4111. doi: 10.3799/dqkx.2019.286

Citation:

Shen Ji, Li Wangye, Li Shuguang, Xiao Yilin, 2019. Crust-Mantle Interactions at Different Depths in the Subduction Channel: Magnesium Isotope Records of Ultramafic Rocks from the Mantle Wedges. Earth Science, 44(12): 4102-4111. doi: 10.3799/dqkx.2019.286

Citation:

Shen Ji, Li Wangye, Li Shuguang, Xiao Yilin, 2019. Crust-Mantle Interactions at Different Depths in the Subduction Channel: Magnesium Isotope Records of Ultramafic Rocks from the Mantle Wedges. Earth Science, 44(12): 4102-4111. doi: 10.3799/dqkx.2019.286

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Crust-Mantle Interactions at Different Depths in the Subduction Channel: Magnesium Isotope Records of Ultramafic Rocks from the Mantle Wedges

doi: 10.3799/dqkx.2019.286

Shen Ji^{1,2
,
,},
Li Wangye^1,2,
Li Shuguang^1,3,
Xiao Yilin^1,2

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, China Academy of Sciences, Hefei 230026, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2019-10-12
Publish Date: 2019-12-15

Abstract

Abstract

At different depths, the subducted slabs could release melts/fluids with distinct chemical components from different reservoirs into the subduction channel. Such melts/fluids may then affect the geochemical compositions of the overlying mantle wedge and the island arc magmas. However, how to identify the sources of melts/fluids at different depths in the subduction channels remains a challenging issue in studies of the subduction zones. Based on the Mg isotope studies on the ultramafic rocks derived from the mantle wedge at different depths, Mg isotopes are proposed to be a useful tool to distinguish the sources of melts/fluids in the subduction channel.A set of metamorphic ultramafic rocks from the Franciscan complex in California that have undergone multiple stages of metasomatism at the shallow depth (< ~60 km) in the subduction channel was studied. During the dehydration reactions that produced talc from serpentine, light Mg isotopes were preferentially released into fluids whereas heavy Mg isotopes were retained in talc. The tremolite-dominated samples that metamorphosed further by slab-derived fluids have high CaO contents and light Mg isotopic compositions, implying that a certain amount of Mg-bearing calcites could be dissolved into fluids and participated in metamorphism of mantle wedge peridotites. The petrographic and elemental geochemical studies of the ultramafic rocks from the Maowu complex of the Dabie orogenic belt, which were derived from the deep mantle wedge (~160 km), confirmed the metasomatism genesis. Combined with multiphase inclusions, element geochemistry, and peak P-T condition, we speculate that the metasomatic fluid was supercritical. Zircon geochronology studies revealed that the metasomatism mainly occurred during the oceanic crust subduction at Paleozoic (454±58 Ma), and the ultra-high pressure metamorphism occurred during the continental crust subduction at Triassic (232.8±7.9 Ma). The large amount of carbonate mineral inclusions and heavy oxygen isotope characteristics of the Paleozoic zircon indicate the incorporations of carbonate components during the Paleozoic metasomatism. The lighter Mg isotope composition of whole rocks and individual minerals than that of the mantle and the Dabie eclogite, indicates that the carbonate components should be sedimentary Mg-rich carbonates, which was dissolved in the supercritical fluid.Due to that the sedimentary carbonate has a unique and significantly enriched light Mg isotope feature, the metasomatism will cause heterogeneous Mg isotopic compositions of the mantle wedge, which may account for the observed Mg isotope characteristics of the arc lavas. Magnesium isotopes thus could be a potentially useful tracer of crust-mantle interactions at subduction zones.
- magnesium isotope,
- orogenic ultramafic rock,
- subduction channel,
- mantle wedge metasomatism,
- zircon,
- petrology

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References(46)

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Crust-Mantle Interactions at Different Depths in the Subduction Channel: Magnesium Isotope Records of Ultramafic Rocks from the Mantle Wedges

doi: 10.3799/dqkx.2019.286

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