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首页> 外文期刊>Journal of Asian earth sciences >Rapid cooling of the Yanshan Belt, northern China: Constraints from ~(40)Ar/~(39)Ar thermochronology and implications for cratonic lithospheric thinning
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Rapid cooling of the Yanshan Belt, northern China: Constraints from ~(40)Ar/~(39)Ar thermochronology and implications for cratonic lithospheric thinning

机译：中国北方燕山带的快速冷却：〜（40）Ar /〜（39）Ar热年代学的约束及其对克拉通岩石圈减薄的影响

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摘要

The Yanshan Orogenic Belt is located in the northern part of the North China Craton (NCC), which lost ～120 km of lithospheric mantle during Phanerozoic tectonic reactivation. Mesozoic magmatism in the Yanshan fold-and-thrust belt began at 195-185 Ma (Early Jurassic), with most of the granitic plutons being Cretaceous in age (138-113 Ma). Along with this magmatism, multi-phase deformational structures, including multiple generations of folds, thrust and reverse faults, extensional faults, and strike-slip faults are present in this belt. Previous investigations have mostly focused on geochemical and isotopic studies of these magmatic rocks, but not on the thermal history of the Mesozoic plutons. We have applied ~(40)Ar/~(39)Ar thermochronology to biotites and K-feldspars from several Lower Cretaceous granitic plutons to decipher the cooling and uplift history of the Yanshan region. The biotite ~(40)Ar/~(39)Ar ages of these plutons range from 107 to 123 Ma, indicating that they cooled through about 350 ℃ at that time. All the K-feld-spar step-heating results modeled using multiple diffusion domain theory yield similarly rapid cooling trends, although beginning at different times. Two rapid cooling phases have been identified at ca. 120-105 and 100-90 Ma. The first phase of rapid cooling occurred synchronously with widespread extensional deformation characterized by the formation of metamorphic core complexes, A-type magmatism, large-scale normal faults, and the development of half-graben basins. This suggests rapid exhumation took place in an extensional regime and was a shallow-crustal-level response to lithospheric thinning of the NCC. The second phase of rapid cooling was probably related to the regional uplift and unroofing of the Yanshan Belt, which is consistent with the lack of Upper Cretaceous sediments in most of the Yanshan region.
机译：燕山造山带位于华北克拉通北部，在古生代构造活化过程中失去了约120 km的岩石圈地幔。燕山褶皱冲断带的中生代岩浆作用始于195-185 Ma（早侏罗世），大多数花岗质岩体年龄为白垩纪（138-113 Ma）。随着这种岩浆作用，该带中出现了多相变形结构，包括多代褶皱，逆冲断层和逆断层，伸展断层和走滑断层。以前的研究主要集中在这些岩浆岩的地球化学和同位素研究上，而不是中生代岩体的热史。我们将〜（40）Ar /〜（39）Ar热年代学应用于几个下白垩纪花岗岩体的黑云母和钾长石，以解读燕山地区的降温和隆升历史。这些云母的黑云母〜（40）Ar /〜（39）Ar年龄在107到123 Ma之间，表明它们当时冷却到约350℃。尽管在不同的时间开始，但使用多重扩散域理论建模的所有K-feld-spar阶跃加热结果都具有相似的快速冷却趋势。大约在2℃时已经确定了两个快速冷却阶段。 120-105和100-90 Ma。快速冷却的第一阶段与广泛的伸展形变同步发生，其特征在于形成了变质岩心，A型岩浆作用，大型正断层和半盆盆地的发展。这表明快速发掘是在伸展状态下进行的，是对NCC岩石圈变薄的浅壳水平响应。快速冷却的第二阶段可能与燕山带的区域隆升和顶顶活动有关，这与燕山大部分地区缺乏上白垩统沉积物是一致的。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第15期|107-126|共20页
  • 作者

    Lin Wu; Fei Wang; Wei Lin; Qingchen Wang; Liekun Yang; Wenbei Shi; Huile Feng;

  • 作者单位

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,University of Chinese Academy of Sciences, Beijing 100049, China;

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  • 正文语种 eng
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  • 关键词

    Cretaceous plutons; Rapid cooling events; ~(40)Ar/~(39)Ar thermochronology; Crustal thinning; Yanshan Belt; North China Craton;

    机译：白垩纪的云母;快速冷却事件;〜（40）Ar /〜（39）Ar热年代学;地壳变薄;燕山带华北克拉通;

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