Two-Stage Extensional Pattern in the North China–Mongolian Tract During Late Mesozoic: Insights from the Spatial and Temporal Distribution of Magmatic Domes and Metamorphic Core Complexes
Two-Stage Extensional Pattern in the North China–Mongolian Tract During Late Mesozoic: Insights from the Spatial and Temporal Distribution of Magmatic Domes and Metamorphic Core Complexes
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DOI：
10.1007/978-981-10-1064-4_19
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Xiaohui Zhang;Lingling Yuan
中科院分区：
文献类型：
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作者：
Xiaohui Zhang;Lingling Yuan
区分岩浆穹隆和变质核杂岩（MCC）仍然是充分理解大陆陆块在伸展作用下的热，机械和化学演化的关键。本文综述了华北-蒙古地区晚中生代岩浆穹隆和MCC的时空特征。中晚侏罗世至早白垩世，内蒙古南部的大青山和马鞍山、北京的云蒙山和西山、辽西的医巫闾山和辽东半岛发育了典型的穹隆，早白垩世的MCC有呼和浩特MCC、喀喇沁MCC、云蒙山MCC、医巫闾山MCC和辽南MCC等。除了建立伸展穹隆，在穹隆的组成深大复合体往往封装多层次的壳幔相互作用，而MCC式的拆离断层通常容纳上地壳结构重组。它们共同构成了华北地区中生代去角质化过程的伴随地壳连续体表现。华北-蒙古陆块两阶段伸展模式的近同步性与碰撞后-板内伸展体制演化过程中岩石圈地幔的重力塌陷和对流迁移相一致。
Differentiating magmatic doming and metamorphic core complex (MCC) remains critical for fully understanding the thermal, mechanical, and chemical evolution of continental landmasses under extension. This review summaries spatially overlapping but temporally distinct magmatic domes and MCCs across the north China–Mongolian tract during late Mesozoic. Typical dome instances are developed at the Daqinshan and Maanshan of southern Inner Mongolia, Yunmengshan and Western Hills of Beijing, Yiwulüshan of western Liaoning and Liaodong Peninsula during middle–late Jurassic to earliest Cretaceous, while well-documented Early Cretaceous MCCs include the Hohhot MCC, the Kalaqin MCC, the Yunmengshan MCC, the Yiwulüshan MCC, the Liaonan MCC and others. Besides building extensional doming, the constituent plutonic complexes in the domes tend to encapsulate multi-level crust–mantle interactions, whereas the MCC-style detachment faulting typically accommodates upper crustal architectural reorganization. They collectively constitute concomitant crustal-continuum expressions of Mesozoic decratonization in the North China Craton (NCC). Near-synchronization of two-stage extensional pattern in the north China–Mongolian tract accords well with gravitational collapse and convective removal of lithospheric mantle within an evolved post-collisional to within-plate extensional regime.