华北克拉通高压基性麻粒岩多矿物岩石年代学揭示了华北克拉通短暂高温变质作用

IF 3.5 2区 地球科学 Q1 GEOLOGY Journal of Metamorphic Geology Pub Date : 2022-06-14 DOI:10.1111/jmg.12681
Xiao-Meng Li, Hao Cheng, Besim Dragovic, Kai-Yang Du, Ying Zhou
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引用次数: 4

摘要

准确确定高温变质作用的峰值年龄和时间尺度是揭示构造动力学的基础。然而,由于锆石U-Pb年龄分布广泛,没有明确的结构关系,变质约束常常受到阻碍。综合石榴石和锆石岩石年代学可以澄清从古代高温变质岩中获得的模糊年龄。关于华北克拉通麻粒岩中约2.5 ~ 1.8 Ga锆石分布的解释一直存在争议。为了明确华北克拉通(超)高温变质作用的时间和持续时间,利用锆石和钛矿U-Pb年代学方法,结合石榴石u - hf和Sm-Nd年代学方法,对华北克拉通阴山地块的一块基性麻粒岩及其毗邻片麻岩进行了研究。伪剖面模拟和常规热气压计算限制了变质峰条件为~1.0 GPa和~850℃。在石榴石中,除了在晶缘处有~2 μm的扩散分布外,几乎完全没有主元素分带,这表明石榴石在峰值温度下完全重新平衡,然后从高温快速冷却。在同一石榴石组分上测定的Lu-Hf年龄(1870±4 Ma)和Sm-Nd年龄(1870±7 Ma)与在与石榴石同时生长的锆石中测定的锆石U-Pb年龄(1866±11 Ma)难以区分,石榴石和锆石共存的化学平衡证明了这一点,并且与钛矿的U-Pb年龄(1876±7 Ma)一致。我们解释这种年龄的紧密一致,在不确定的范围内,加上石榴石中存在平坦的Sm-Nd-Hf剖面,也保存完好的Lu分带,反映了一个短暂的高温变质事件,该事件被快速挖掘和冷却所终止。短期(< 4myr)高温变质作用可能发生在地壳最下部,是鄂尔多斯与阴山地块碰撞后伸展过程中岩浆的下镀/内镀作用。
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Multi-mineral petrochronology on a high-pressure mafic granulite reveals short-lived high-temperature metamorphism in the North China Craton

Accurately defining the peak ages and timescales of high-temperature metamorphism is fundamental to unravelling tectonic dynamics. However, metamorphic constraints are frequently hampered by a large spread of zircon U–Pb ages without explicit textural relationships. Integrated garnet and zircon petrochronology may clarify ambiguous ages retrieved from ancient high-temperature metamorphic rocks. There is a long-standing debate on the interpretation of the spread of zircon ages from c. 2.5–1.8 Ga for the granulites of the North China Craton. In order to clarify the timing and duration of (ultra)high-temperature metamorphism in the North China Craton, we investigated a mafic granulite and the adjoining gneiss from the Yinshan Block of the North China Craton using zircon and titanite U–Pb geochronology combined with garnet Lu–Hf and Sm–Nd geochronology. Pseudosection modelling and conventional thermobarometric calculations constrain the peak metamorphic conditions to be ~1.0 GPa and ~850°C. The near-complete lack of major-element zoning in garnet, aside from ~2 μm diffusion profiles at crystal rims, suggests complete re-equilibration at peak temperatures followed by fast cooling from high temperatures. The Lu–Hf garnet age of 1870 ± 4 Ma and Sm–Nd age of 1870 ± 7 Ma, determined on the same garnet fractions, are indistinguishable from the zircon U–Pb age of 1866 ± 11 Ma obtained from zircon that grew contemporaneously with garnet, evidenced by the chemical equilibrium of coexisting garnet and zircon, and are additionally consistent with a titanite U–Pb age of 1876 ± 7 Ma. We interpret this close agreement of ages, within uncertainty, coupled to the existence of flat Sm–Nd–Hf profiles in garnet that also has well-preserved Lu zoning, to reflect a short-lived high-temperature metamorphic event that was terminated by rapid exhumation and cooling. The short-lived (<4 Myr) high-temperature metamorphism may be generated in the lowermost parts of the crust through magmatic underplating/intraplating during extension that follows collision of the Ordos and the Yinshan Blocks.

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来源期刊
CiteScore
6.60
自引率
11.80%
发文量
57
审稿时长
6-12 weeks
期刊介绍: The journal, which is published nine times a year, encompasses the entire range of metamorphic studies, from the scale of the individual crystal to that of lithospheric plates, including regional studies of metamorphic terranes, modelling of metamorphic processes, microstructural and deformation studies in relation to metamorphism, geochronology and geochemistry in metamorphic systems, the experimental study of metamorphic reactions, properties of metamorphic minerals and rocks and the economic aspects of metamorphic terranes.
期刊最新文献
Issue Information Zircon Coupled Dissolution–Precipitation Replacement During Melt–Rock Interaction Modifies Chemical Signatures Resulting in Misleading Ages Pressure–Temperature–Time Evolution of a Polymetamorphic Paragneiss With Pseudomorphs After Jadeite From the HP–UHP Gneiss-Eclogite Unit of the Variscan Erzgebirge Crystalline Complex, Germany Issue Information Experimental Replacement of Zircon by Melt-Mediated Coupled Dissolution-Precipitation Causes Dispersion in U–Pb Ages
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