In-situ U-Pb dating, Hf isotope analyses of zircons, and geochemical characteristics in the volcanic rocks of the Tiaojishan Formation in the Jinyang Basin, western Liaoning province
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摘要: [研究目的]辽西地区侏罗系髫髻山组火山岩不仅代表了燕山期大规模火山喷发的开始，也与华北克拉通破坏减薄的时限、范围及机制研究密切相关。近年来，针对髫髻山组火山岩的成因研究取得了很多新认识，但其构造背景、岩浆源区尚存在争议。[研究方法]本文选取羊D1 井连续钻井岩心样品为研究对象，开展锆石U-Pb 测年、Hf同位素组成及岩石地球化学特征分析。[研究结果]锆石U-Pb测年结果表明，髫髻山组下部粗面岩锆石U-Pb年龄为162.8±1.7 Ma，结合羊D1井土城子组底部凝灰岩153.8±1.7 Ma的U-Pb年龄，认为髫髻山组火山岩形成于晚侏罗世。另外，髫髻山组下部粗面岩Eu 负异常不明显，具有轻稀土富集、重稀土亏损以及低Sr、Yb 型岩浆岩等特征，表明髫髻山组粗面岩是由壳源岩浆在较高的压力下，经历部分熔融作用产生，并伴随有不显著的结晶分异作用；其锆石的εHf（t）值为-22.1～-15.4，二阶段模式年龄（TDMC）为2.182～2.604 Ga，表明髫髻山组火山岩的岩浆源区主要来源于晚太古代，揭示其是在太平洋板块向欧亚大陆俯冲背景下，由晚太古代下地壳基性岩石的部分熔融所形成，为后期岩石圈地幔拆离即华北克拉通减薄准备了条件。[结论]该研究成果，明确了髫髻山组火山岩的形成时代及岩浆源区，对探讨燕山造山带中生代岩浆演化和区域构造演化研究提供了科学依据。Abstract: This paper is the result of geochemical research.[Objective]The volcanic rocks of the Tiaojishan Formation in Western Liaoning not only represent the beginning of the Yanshanian large-scale volcanic eruption, but also are closely related to the time, scope and mechanism of the Craton weakening in North China.In recent years, a lot of new understanding has been obtained on the petrogenesis of the Tiaojishan Formation volcanic rocks, but its tectonic background, magmatic source area are still controversial. [Methods]Zircon U-Pb dating, Hf isotope composition and geochemical characteristics were analyzed in the core samples from the continuous drilling of borehole Yang D1. [Results]The results of zircon U-Pb dating show that the zircon U-Pb age of trachyte in the lower part of Tiaojishan Formation is 162.8±1.7 Ma, and the U-Pb age of tuff at the bottom of Tuchengzi Formation is 153.8 ±1.7 Ma. We believe that the volcanic rocks of Tiaojishan Formation formed in the Late Jurassic. In addition, the trachyte of Tiaojishan Formation is characterized by light rare earth enrichment, heavy rare earth deficit, and low Sr and Yb-type magmatic rocks, which indicates that the trachyte of Tiaojishan Formation is produced by partial melting of crustal magma under high pressure and accompanied by insignificant crystallization differentiation.The εHf(t)values of the zircons range from-22.1 to-15.4, and the two-stage model ages(TDMC)range from 2.182~2.604 Ga, indicating that the Tiaojishan Formation is mainly derived from the late Archean magma source, which indicates that the Tiaojishan formation was formed by the partial melting of the basic rocks in the lower crust under the background of the Pacific plate subduction to Eurasia continent. [Conclusions]The research results define the formation age and magma source area of the Tiaojishan Formation volcanic rocks, and provide a scientific basis for exploring the Mesozoic magmatic and regional tectonic evolution of the Yanshan orogenic belt.
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Key words:
- Tiaojishan Formation /
- zircon U-Pb dating /
- Hf isotope /
- Jinyang Basin /
- North China craton
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