山西花岗岩的锆石U-Pb年龄及其对中生代华北克拉通构造演化的意义

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Minerals Pub Date : 2024-09-15 DOI:10.3390/min14090940
Fuhui Qi, Pengpeng Li, Chao Liu
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引用次数: 0

摘要

中生代花岗岩构造为了解华北克拉通的构造历史提供了重要信息。淮安地层中两块中生代花岗岩的新锆石U-Pb年龄分别为义和(YH)花岗岩226.4±1.1Ma和朱家沟(ZJG)花岗闪长岩156.3±2.9Ma。沂河花岗岩的负Nb、Ta和Ti异常;高Nb/Ta比值(20.4-24.1);高(La/Yb)N(30-84);低初始87Sr/86Sr比值(0.707725-0.708188);以及负ƐNd(t)值表明它起源于下地壳和岩石圈地幔的部分熔融。然而,ZJG 花岗闪长岩的地球化学和 Sr-Nd 同位素结果具有 I 型花岗岩的特征:Na2O+K2O值为7.27至7.94 wt%,Nb异常为负值,Pb异常为正值,初始87Sr/86Sr比值较高(0.710979-0.714841),ƐNd(t)值低很多(-27.1至-30.1)。晚侏罗世朱家沟复合体是由增厚的低地壳部分熔融而成,在晚三叠世,岩浆岩是在碰撞后的伸展机制下形成的。岩石圈地幔和下地壳的部分熔融所产生的岩浆在岩浆层的多次上涌中混合。这些混合岩浆经过碎裂结晶后上升到上地壳,从而形成了YH复合体。在晚侏罗世,NCC 的构造体系从压缩转向延伸。本研究确定的晚侏罗世侵入体是在与古太平洋俯冲有关的压缩环境中发育的。
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Zircon U-Pb Ages of the Granitoids in Shanxi and Its Significance for Tectonic Evolution of North China Craton in Mesozoic
Mesozoic granitoid formations offer crucial insights into the tectonic history of the North China Craton. New zircon U-Pb ages of two Mesozoic granitoids in the Huai’an terrane yield ages of 226.4 ± 1.1 Ma for the Yihe (YH) granite and 156.3 ± 2.9 Ma for the Zhujiagou (ZJG) granodiorite. The negative Nb, Ta, and Ti anomalies; high Nb/Ta ratios (20.4 to 24.1); high (La/Yb)N (30–84); low initial 87Sr/86Sr ratios (0.707725–0.708188); and negative ƐNd(t) values of the Yihe complex suggest that it originated from the partial melting of the lower crust and lithospheric mantle. However, the geochemical and Sr-Nd isotopic results of the ZJG granodiorite are characterized by I-type granites: Na2O + K2O values of 7.27 to 7.94 wt%, negative Nb anomalies, positive Pb anomalies, higher initial 87Sr/86Sr ratios (0.710979–0.714841), and much lower ƐNd(t) values (−27.1 to −30.1). The Late Jurassic Zhujiagou complex was derived from partial melting of a thickened low crust, and during the Late Triassic, magmatic rocks were formed under a post-collisional extensional regime. Multiple upwellings of the asthenosphere facilitated the mixing of magmas derived from partial melting of the lithospheric mantle and lower crust. These mixed magmas then ascended to the upper crust after undergoing fractional crystallization, leading to the formation of the YH complex. In the Late Jurassic, the tectonic regime of the NCC shifted from compression to extension. The Late Jurassic intrusion identified in this study developed within a compressional setting linked to the subduction of the Paleo-Pacific Ocean.
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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