北祁连东段白银岩群双峰式火山岩锆石U-Pb年龄、Hf同位素及地球化学特征

计波; 李向民; 时超; 余吉远; 王国强

doi:10.3799/dqkx.2022.484

Volume 49 Issue 7

Jul. 2024

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Article Navigation > Earth Science > 2024 > 49(7): 2490-2507

Ji Bo, Li Xiangmin, Shi Chao, Yu Jiyuan, Wang Guoqiang, 2024. Zircon U-Pb Ages, Hf Isotopes and Geochemistry of Bimodal Volcanic Rocks in Baiyin Group, Eastern North Qilian. Earth Science, 49(7): 2490-2507. doi: 10.3799/dqkx.2022.484

Citation:

Ji Bo, Li Xiangmin, Shi Chao, Yu Jiyuan, Wang Guoqiang, 2024. Zircon U-Pb Ages, Hf Isotopes and Geochemistry of Bimodal Volcanic Rocks in Baiyin Group, Eastern North Qilian. Earth Science, 49(7): 2490-2507. doi: 10.3799/dqkx.2022.484

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Zircon U-Pb Ages, Hf Isotopes and Geochemistry of Bimodal Volcanic Rocks in Baiyin Group, Eastern North Qilian

doi: 10.3799/dqkx.2022.484

Ji Bo^{1, 2
,
,},
Li Xiangmin²,
Shi Chao^{1, 2},
Yu Jiyuan²,
Wang Guoqiang²

1.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
2.
MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China

Received Date: 2022-08-15
Available Online: 2024-08-03
Publish Date: 2024-07-25

Abstract

Abstract

The Baiyin Group, which is the ore-hosted strata in Baiyin ore field, is located at the southeast of North Qilian. The research of isotope chronology, petrology and whole-rock geochemistry was carried out on the bimodal volcanic rocks to reveal their ages, petrogenesis and forming environment. LA-ICP-MS zircon U-Pb dating results show that the group age of the rhyolites are 473.0±1.7 Ma and 473.9±2.1 Ma (²⁰⁶Pb/²³⁸U ages), and it can be confirmed that the rhyolite suite formed during the Early Ordovician. The basalt samples, which are regarded as the low-K sub-alkaline tholeiitic series, have geochemical characteristics including high Al₂O₃, low K₂O, TiO₂ and P₂O₅. The rhyolitic rocks (SiO₂ > 70%), which belong to cold-wet-oxidized rhyolite, exhibit low FeO^T/MgO values (2.44-2.80) and total REE content. With enrichment in incompatible element (Ba, Th, U), obvious negative anomalies of Nb, Ta, Ti and no obvious Eu anomalies (δEu=0.76-0.92), the bimodal volcanic rocks show the geochemical features of island arc magma. The rhyolite zircon ε_Hf(t) values range from -4.14 to 14.78 with Hf Model ages (t_DM2) varying from 1 707 Ma to 505 Ma. These features can be concluded that the basalt derived from partial melting of depleted mantle under the effect of subduction fluids and crustal contamination. Meanwhile, the rhyolite may be derived from partial melting of crustal material with a small amount of mantle-derived magma, therefore they are not comagma. The petrology and geochemical information of bimodal volcanic rocks from Baiyin Group indicate they formed in transitional environment from island arc to back-arc basin when northward subduction happened in Early Ordovician.
- Baiyin Group,
- bimodal volcanic rocks,
- LA-ICP-MS zircon U-Pb dating,
- Lu-Hf isotopes,
- North Qilian,
- petrology

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References(80)

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Zircon U-Pb Ages, Hf Isotopes and Geochemistry of Bimodal Volcanic Rocks in Baiyin Group, Eastern North Qilian

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