Middle Neoarchean magmatism in western Shandong, North China Craton: SHRIMP zircon dating and LA-ICP-MS Hf isotope analysis

Middle Neoarchean magmatism in western Shandong, North China Craton: SHRIMP zircon dating and LA-ICP-MS Hf isotope analysis
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华北克拉通鲁西中新太古代岩浆活动:SHRIMP锆石定年及LA-ICP-MS Hf同位素分析

DOI:
10.1016/j.precamres.2014.07.016
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发表时间:
2014-12
影响因子:
3.8
通讯作者:
Wan YS, Dong CY, Wang SJ, Kröner A, Xie HQ, Ma MZ,
Wan YS, Dong CY, Wang SJ, Kröner A, Xie HQ, Ma MZ,
中科院分区:
地球科学2区
文献类型:
--
作者:
Wan YS, Dong CY, Wang SJ, Kröner A, Xie HQ, Ma MZ,

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鲁西地区是华北地区新太古代深成和表壳岩分布较广的典型地区。早期研究表明,该区发育有102.7Ga和102.5Ga的岩浆-构造-热事件。本文报道了角闪石岩、片麻状英云闪长岩、片麻状奥长花岗岩和片麻状花岗岩等10个不同类型岩浆岩样品的SHRIMP U-Pb年龄和Hf-In-锆石同位素数据。岩浆锆石的~(207)Pb/~(206)Pb年龄为2667 ~ 2598 Ma。某些岩石含有102.5Ga变质边缘和102.7Ga锆石核。岩浆锆石的Hf(t)值为-1.1 ~+11.3,Hf地壳模式年龄为3.02- 2.4Ga。结合前人的研究,我们的主要结论是:中新太古代岩石主要与早新太古代岩石共同产出于中央带的东北部。鲁西地区新太古代中期的陆壳年轻增重作用和地壳再循环作用起着重要作用,整个新太古代构造演化可划分为新太古代中、早期(2.75- 2.6Ga)和新太古代晚期(2.6- 2.5Ga)两个阶段。
Western Shandong Province is a typical area of the North China Craton (NCC) where Neoarchean plutonic and supracrustal rocks are widely distributed. Early studies documented that ∼2.7 Ga and ∼2.5 Ga magmato-tectono-thermal events are well developed in the area. Here we report SHRIMP U–Pb ages and Hf-in-zircon isotopic data from ten samples of different magmatic rock types including hornblendite, gneissic tonalite, gneissic trondhjemite and gneissic granite. Magmatic zircon grains have207Pb/206Pb ages ranging from 2667 to 2598 Ma. Some rocks contain ∼2.5 Ga metamorphic rims and ∼2.7 Ga zircon cores. The magmatic zircon grains haveɛHf(t) values and Hf crustal model ages of −1.1 to +11.3 and 3.02–2.4 Ga, respectively. Combined with an earlier study, our main conclusions are that the middle Neoarchean rocks mainly occur together with early Neoarchean rocks in the northeastern portion of the central belt. Juvenile additions to continental crust and crustal recycling played important roles in the middle Neoarchean of western Shandong Province, and the entire Neoarchean tectonic evolution can be divided into middle to early Neoarchean (2.75–2.6 Ga) and late Neoarchean (2.6–2.5 Ga) events.
华北克拉通西北缘新太古代晚期幕式地幔熔融-地壳改造:阴山地块岩浆岩和变质岩的锆石年龄
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