华北克拉通东南部蚌埠隆起晚中生代花岗岩类岩体内变形记录与构造意义
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本文为国家自然科学基金资助项目(批准号: 41472186,91214301)的成果。


Deformation Records in Late Mesozoic Plutons in the Bengbu Uplift in the Southeastern North China Craton and Their Tectonic Implications
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    摘要:

    华北克拉通东南部蚌埠隆起上出露了一系列晚中生代花岗岩类岩体,记录了丰富的变形过程。本次与前人锆石定年结果表明,该区经历过两期岩浆活动,分别是中—晚侏罗世(167~148 Ma)和早白垩世(130~112 Ma)。区内晚侏罗世蚂蚁山岩体记录了切过该岩体的一条北北东向左行韧性变形带,是北北西—南南东向挤压的产物。该走滑变形带在走滑隆升中又被脆性平移断层所叠加。走滑活动时间可以限定在148~130 Ma之间。研究区在130~112 Ma期间转变为强烈的伸展活动,区域拉张方向为北西西—南东东向,并伴随着岩浆活动与区域隆升。在此伸展过程中,中—晚侏罗世荆山—涂山岩体与早白垩世淮光岩体记录了深部韧性伸展拆离变形带抬升至浅部被脆性正断层所叠加的变形过程,而其它岩体内均记录了地壳浅部的脆性正断层活动。这些岩体的变形记录,指示华北克拉通东部晚中生代由挤压向伸展构造体制转变发生在148~130 Ma期间,提供了在早白垩世克拉通峰期破坏中目前非盆地区构造过程的实例。

    Abstract:

    A series of late Mesozoic plutons are exposed in the Bengbu Uplift in the southeastern North China Craton, and record abundant deformation processes. This and previous zircon dating results show two phases of magmatism in this region, including Middle—Late Jurassic one (167~148 Ma) and Early Cretaceous one (130~112 Ma). The Late Jurassic Mayishan pluton records a NNE striking sinistral ductile deformation belt formed under the NNW—SSE compression. This strike slip deformation belt was overprinted by brittle sinistral faults during its faulting induced uplifting. Time of the strike slip deformation can be constrained between 148 Ma and 130 Ma. The region experienced intense WNW—ESE extension during 130~112 Ma, which was accompanied with magmatism and regional uplifting. The Middle—Late Jurassic Jinshan—Tushan pluton and Early Cretaceous Huaiguang pluton record a deformation process from extensional ductile detachment deformation at deep levels to shallow overprinting by brittle normal faults during the extensional activity. Other plutons in this region all show brittle normal faulting at shallow levels. The deformation in the plutons suggests that transition from compression to extension regimes in the eastern North China Craton took place between 148 Ma and 130 Ma, and provides an example for structural evolution in a non basin area during the Early Cretaceous peak destruction of the craton.

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宋利宏,朱光,赵田,林少泽.2016.华北克拉通东南部蚌埠隆起晚中生代花岗岩类岩体内变形记录与构造意义[J].地质论评,62(2):400-418,[DOI].
SONG Lihong, ZHU Guang, ZHAO Tian, LIN Shaoze.2016. Deformation Records in Late Mesozoic Plutons in the Bengbu Uplift in the Southeastern North China Craton and Their Tectonic Implications[J]. Geological Review,62(2):400-418.

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  • 收稿日期:2015-01-05
  • 最后修改日期:2015-10-13
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  • 在线发布日期: 2016-03-16
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