拉萨地块措勤-隆格尔地区铁矿床成岩时代、岩石成因及构造环境指示

于玉帅; 周云; 鲍波; 高原; 杨竹森

doi:10.3799/dqkx.2019.037

Volume 44 Issue 6

Jun. 2019

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Yu Yushuai, Zhou Yun, Bao Bo, Gao Yuan, Yang Zhusen, 2019. Geochronology, Petrogenesis and Its Tectonic Setting Significance of Intrusive Rocks from Coqen to Longgeer Iron Deposit, Lhasa Subterrane, Tibet, China. Earth Science, 44(6): 1888-1904. doi: 10.3799/dqkx.2019.037

Citation:

Yu Yushuai, Zhou Yun, Bao Bo, Gao Yuan, Yang Zhusen, 2019. Geochronology, Petrogenesis and Its Tectonic Setting Significance of Intrusive Rocks from Coqen to Longgeer Iron Deposit, Lhasa Subterrane, Tibet, China. Earth Science, 44(6): 1888-1904. doi: 10.3799/dqkx.2019.037

Citation:

Yu Yushuai, Zhou Yun, Bao Bo, Gao Yuan, Yang Zhusen, 2019. Geochronology, Petrogenesis and Its Tectonic Setting Significance of Intrusive Rocks from Coqen to Longgeer Iron Deposit, Lhasa Subterrane, Tibet, China. Earth Science, 44(6): 1888-1904. doi: 10.3799/dqkx.2019.037

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Geochronology, Petrogenesis and Its Tectonic Setting Significance of Intrusive Rocks from Coqen to Longgeer Iron Deposit, Lhasa Subterrane, Tibet, China

doi: 10.3799/dqkx.2019.037

Yu Yushuai^{1,2,3
,
,},
Zhou Yun^2,3,
Bao Bo^2,3,
Gao Yuan⁴,
Yang Zhusen⁵

1.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2.
Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China
3.
Research Center of Granitic Diagenesis and Mineralization, China Geological Survey, Wuhan 430205, China
4.
Jiangxi Institute of Geology Survey, Nanchang 330030, China
5.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2018-11-07
Publish Date: 2019-06-15

Abstract

Abstract

In order to gain an in-depth understanding of the tectonic setting of the north and central of Lhasa block, bulk-rock elemental and Sr-Nd-Pb isotopic data for the ore-forming granodiorites of Luobule and Longgeer iron deposit are analyzed and LAICP -MS zircon U -Pb dating result (111.3±1.6 Ma; MSWD=0.61, n=9) for the granodiorite of Luobule deposit.The Luobule and Longgeer ore-forming granodiorites are characterized with high silica (SiO₂ contents are 66.63%-69.02% and 64.33%-64.82%, respectively), high alkali (alkali oxides contents are 5.91%-6.40% and 5.81%-6.05%, respectively), but low A/CNK ratios (0.91-0.97 and 0.94-0.95).These intrusive rocks are enriched in LILEs (e.g., Rb、Th、U、K、Pb) while depleted in Ba and HFSEs (e.g., Nb、Ta、Sr、Ti).There have right oblique in chondrite-normalized REE patterns and similar primitive mantle normalized trace element spectrum.In addition, the intrusive granodiorites of Luobule and Longgeer have low ∑ REE (123.11×10^-6-148.83×10^-6 and 96.17×10^-6-101.92×10^-6, respectively) and negative Eu anomaly (0.70-0.82 and 0.79-0.81, respectively).The (²⁰⁶Pb/²⁰⁴Pb)_t, (²⁰⁷Pb/²⁰⁴Pb)_t, (²⁰⁸Pb/²⁰⁴Pb)_t, (⁸⁷Sr/⁸⁶Sr)_i and (¹⁴³Nd/¹⁴⁴Nd)_i ratios of whole rock and plagioclase from Longgeer deposit are 18.474 and 18.626, 15.657 and 15.722, 38.592 and 39.145, 0.512 281 and 0.512 339, 0.704 757 6 and 0.707 047 3, respectively.The calculated ε_Nd(t) and t_DM2 of the whole rock and plagioclase from Longgeer deposit are -4.13 and -2.99, 1.15 Ga and 1.24 Ga, respectively.In contrast, the (²⁰⁶Pb/²⁰⁴Pb)_t, (²⁰⁷Pb/²⁰⁴Pb)_t, (²⁰⁸Pb/²⁰⁴Pb)_t, (⁸⁷Sr/⁸⁶Sr)_i, (¹⁴³Nd/¹⁴⁴Nd)_i and ε_Nd(t) values of whole rock from Luobule are 18.281, 15.616, 38.369, 0.512 309, 0.706 551 4, -3.62 and 1.20 Ga, respectively.The results above reveal that the ore-forming granodiorites were the product of arc magmatism in late stage of early Cretaceous and were medium -high -K calc-alkaline I-type granite.The primitive magma of the ore-forming plutons were mainly generated by partial melting of crustal materials with the mixing of crust-derived silicic melts and mantle-derived mafic melts and the assimilation of the corresponding wall rocks.Combined with the previous study, by force of contrast the metallogenic event of north and central Lhasa subterrane and southern Qiangtang subterrane, it is propose that there existed extensive magmatism (113±3 Ma) and Fe(-Cu) ore-forming events in north and central Lhasa subterrane are closely related to the break-off of Bangong CoNujiang subducted oceanic crust.
- geochronology,
- petrogenesis,
- Sr-Nd-Pb isotope,
- iron deposit,
- Coqen,
- Longgeer,
- Lhasa subterrane,
- petrology

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References(67)

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Geochronology, Petrogenesis and Its Tectonic Setting Significance of Intrusive Rocks from Coqen to Longgeer Iron Deposit, Lhasa Subterrane, Tibet, China

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