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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >~(40)Ar/~(39)Ar geochronology of the North China and Yangtze Cratons: New constraints on Mesozoic cooling and cratonic destruction under East Asia
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~(40)Ar/~(39)Ar geochronology of the North China and Yangtze Cratons: New constraints on Mesozoic cooling and cratonic destruction under East Asia

机译：华北和长江克拉通的〜（40）Ar /〜（39）Ar年代学：东亚地区中生代冷却和克拉通破坏的新约束

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摘要

Lithospheric destruction of the North China Craton (NCC) is a prominent phenomenon during the Mesozoic, but the timing and process are still in dispute. Furthermore, whether the Yangtze Craton (YTC) was also destructed is controversial. Twenty samples collected from the NCC and YTC were subjected to high-resolution ~(40)Ar/~(39)Ar geochronological and thermochronological studies. Average cooling rates of 450–150°C were estimated, showing that a rapid cooling event (~12°C/Ma) occurred on the NCC but not on the YTC during the LateMesozoic. Crustal thickness can be roughly estimated by using pure conductive cooling showing that the crust of the NCC in the Jurassic was thicker than in the Cretaceous. Nonlinear cooling histories and cooling rates obtained by using multidomain diffusion theory show that the upper crusts of NCC and YTC had different cooling patterns during the Mesozoic. Combined with the sedimentation rates on the NCC, we argue that lithospheric thinning of the NCC began in the northern portion at ~140–135Ma and peaked in the central and eastern portions at ~125–100 Ma, at a cooling rate of ~9.6°C/Ma. In contrast, the YTC cooled gently during 200–75 Ma at a rate of ~1.2°C/Ma, implying that the lithospheric thinning did not happen there during this time. Pure conductive cooling suggests that the crust of the YTC in the Late Triassic was thicker than the NCC in the Cretaceous; therefore, we argue that the lithospheric destruction in the YTC might have occurred after ~75 Ma.
机译：华北克拉通（NCC）的岩石圈破坏是中生代的一个突出现象，但时间和过程仍存在争议。此外，长江克拉通（YTC）是否也遭到破坏还存在争议。从NCC和YTC收集的20个样品进行了高分辨率的〜（40）Ar /〜（39）Ar地质年代学和热年代学研究。估计平均冷却速度为450–150°C，这表明晚中生代NCC发生了快速冷却事件（〜12°C / Ma），而YTC没有发生。地壳厚度可以通过使用纯传导冷却法粗略估算，这表明侏罗纪NCC的地壳比白垩纪厚。利用多域扩散理论获得的非线性冷却历史和冷却速率表明，中生代NCC和YTC的上地壳具有不同的冷却方式。结合NCC的沉积速率，我们认为NCC的岩石圈变薄开始于北部，在〜140–135Ma处，而在中部和东部则在〜125–100 Ma处达到顶峰，冷却速度为〜9.6° C / Ma。相反，YTC在200–75 Ma内以〜1.2°C / Ma的速率缓慢冷却，这意味着在此期间岩石圈没有变薄。纯传导冷却表明，晚三叠世的YTC地壳比白垩纪的NCC地壳厚。因此，我们认为YTC的岩石圈破坏可能发生在〜75 Ma之后。

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