Mesozoic crust-mantle interaction beneath the North China craton: A consequence of the dispersal of Gondwanaland and accretion of Asia
Mesozoic crust-mantle interaction beneath the North China craton: A consequence of the dispersal of Gondwanaland and accretion of Asia
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DOI：
10.1130/g19489.1
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发表时间：
2003-09
期刊：
影响因子：
5.8
通讯作者：
S. Wilde;Xin-hua Zhou;A. Nemchin;M. Sun
中科院分区：
文献类型：
--
作者：
S. Wilde;Xin-hua Zhou;A. Nemchin;M. Sun
本文从新生代汉诺坝玄武岩下地壳捕虏体中夹带的锆石提供了中生代晚期华北克拉通多次熔融事件的证据。活动高峰在180 ~ 80 Ma之间，其上地壳特征为大量花岗类及相关火山岩的生成，闪长岩和煌斑岩脉侵位，广泛的金矿化。这一过程包括地幔岩石圈的部分损失，伴随着中国东部软流圈地幔的整体上升。我们将这些事件与冈瓦纳大陆的分裂和分散导致的岩石圈变薄联系起来，并伴随着一个主要的地幔倾覆，由海洋岩石圈的破坏推动，并在随后的亚洲增生期间下沉到下地幔中。
We present evidence from zircons entrained within lower-crustal xenoliths in the Cenozoic Hannuoba Basalt of multiple melting events beneath the North China craton in the late Mesozoic. Peak activity was between 180 and 80 Ma, the upper crustal signature of which was the generation of voluminous granitoids and related volcanic rocks, emplacement of dioritic and lamprophyric dikes, and widespread gold mineralization. The process involved partial loss of mantle lithosphere, accompanied by wholesale rising of asthenospheric mantle beneath eastern China. We correlate these events with lithospheric thinning resulting from the breakup and dispersal of Gondwanaland, accompanied by a major mantle overturn, fueled by the destruction of oceanic lithosphere and triggered by its sinking into the lower mantle during the subsequent accretion of Asia.