华北克拉通破坏期间大陆地壳水溶熔融引起的大规模白垩纪埃达克岩岩浆活动

IF 3.5 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Shuo Xue, Wanzhu Zhang, Ming-Xing Ling, Weidong Sun, Xing Ding
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引用次数: 0

摘要

华北克拉通(NCC)失稳背后的机制一直是研究人员争论的话题。北克拉通地区白垩纪大规模埃达克岩岩浆活动提供了对去殖民化过程的认识。本文以北陆构造带南缘小秦岭的华山和老牛山岩体为研究对象,结合已发表的同时期埃达克质岩石资料,探讨了北陆构造带破坏高峰时期水在埃达克质岩石成因中的作用。华山和老牛山岩体均表现出高Sr (193 ~ 1080 ppm)、低Yb (14.8 ppm)和低Y (1.24 ppm)、高Sr/Y(18 ~ 100)和高La/Yb(24 ~ 58)特征。锆石Hf-O同位素组成表明,花山和老牛山岩体的主要来源为北陆块基性下地壳。然而,两种岩体在微量元素特征上存在显著差异。与老牛山岩体相比,华山岩体具有较高的Na2O/K2O比值,较低的Rb、Rb/Sr、Nb、Ta含量,弱的Eu异常。这些地球化学属性的变化不能用地幔岩浆混合、地壳污染或分块结晶过程等机制来解释。相反,这些差异归因于不同的地壳熔融模式,包括水熔融和脱水熔融。随后,我们对不同压力(0.5 ~ 1.5 GPa)和含水量(1 ~ 3 wt.%)条件下的基性下地壳熔融过程进行了热力学模拟。模拟结果表明,华山岩体极有可能是在正常地壳厚度(1 GPa)条件下通过水熔融形成的。另一方面,老牛山岩体可能是在正常地壳厚度和压力条件下脱水熔融形成的。值得注意的是,高压(1.5 GPa)并不是陆内埃达质岩形成的必要条件。交代岩石圈地幔的水释放和随后下大陆地壳的水化作用引发了北陆块广泛的埃达克岩浆岩活动。这些发现强调了深水循环在认识大规模岩浆事件中的重要意义,并阐明了去岩浆化机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Large-scale Cretaceous adakitic magmatism induced by water-fluxed melting of continental crust during the North China Craton destruction
ABSTRACT The mechanism behind the destabilization of the North China Craton (NCC) remains a contentious topic among researchers. Large-scale Cretaceous adakitic magmatism in the NCC offers insights into the decratonization process. This study focuses on the Huashan and Laoniushan plutons located in the Lesser Qinling on the southern margin of the NCC and compiles published data for coeval adakitic rocks to investigate the role of water in adakitic rock petrogenesis during the peak destruction of NCC. Both the Huashan and Laoniushan plutons exhibit adakitic signatures, including high Sr (193–1080 ppm), low Yb (<14.8 ppm) and Y (<1.24 ppm) concentrations, as well as high Sr/Y (18–100) and La/Yb (24–58) ratios. The zircon Hf–O isotope compositions suggest that the primary source for the Huashan and Laoniushan plutons is the mafic lower crust of NCC. Nevertheless, there are significant differences in trace element characteristics between the two plutons. Specifically, the Huashan pluton displays higher Na2O/K2O ratios, lower levels of Rb, Rb/Sr, Nb, Ta content, and a weak Eu anomaly in comparison to the Laoniushan pluton. These variations in geochemical attributes cannot be accounted for by mechanisms like mantle-derived magma mixing, crustal contamination, or fractional crystallization processes. Instead, these disparities are attributed to distinct modes of crustal anatexis, involving both water-fluxed and dehydration melting. Subsequently, we conducted thermodynamic simulations of the melting process of mafic lower crust under different pressure (0.5–1.5 GPa) and water content conditions (1–3 wt.%). The simulation results suggest that the Huashan pluton is most likely formed through water-fluxed melting in a scenario with normal crustal thickness (1 GPa). On the other hand, the Laoniushan pluton might have originated from dehydration melting under normal crustal thickness and pressure conditions. Notably, high pressure (>1.5 GPa) is not necessary for the formation of intracontinental adakitic rocks. The release of water from metasomatized lithospheric mantle and subsequent hydration of the lower continental crust triggers extensive adakitic magmatism in the NCC. These findings emphasize the significance of deep water cycling in understanding large-scale magmatic events and illuminate the decratonization mechanism.
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来源期刊
Journal of Petrology
Journal of Petrology 地学-地球化学与地球物理
CiteScore
6.90
自引率
12.80%
发文量
117
审稿时长
12 months
期刊介绍: The Journal of Petrology provides an international forum for the publication of high quality research in the broad field of igneous and metamorphic petrology and petrogenesis. Papers published cover a vast range of topics in areas such as major element, trace element and isotope geochemistry and geochronology applied to petrogenesis; experimental petrology; processes of magma generation, differentiation and emplacement; quantitative studies of rock-forming minerals and their paragenesis; regional studies of igneous and meta morphic rocks which contribute to the solution of fundamental petrological problems; theoretical modelling of petrogenetic processes.
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