胶北隆起晚中生代构造-岩浆演化历史
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Late Mesozoic tectono-magmatic evolution history of the Jiaobei uplift,Jiaodong peninsular
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    摘要:

    基于野外观察、断层滑动矢量分析和古构造应力场反演,研究了胶北隆起区两条主要断裂带(招远-平度断裂带和牟平-即墨断裂带北段)的活动历史及古构造应力状态,结合火成岩40Ar-39Ar、SHRIMP和LA-ICPMS锆石U-Pb测年结果,确定了该区晚中生代主要构造-热事件和构造应力体制的转换时限。结果表明,晚侏罗世-早白垩世时期胶北隆起区经历了从地壳挤压为主到引张伸展为主的运动学转变历史。晚侏罗世构造幕式挤压导致地壳增厚和玲珑型花岗岩体侵位,岩浆活动年龄指示了两期构造-热事件:早期集中在160~150 Ma,晚期在147~142 Ma。胶北隆起区NNE向断裂带发生低角度逆冲和左旋走滑活动,挤压应力方向为NW-SE。早白垩世中晚期,伸展构造应力体制占据主导地位,引张应力方向为NW-SE至NWW-SEE。这期伸展作用不仅导致了胶莱断陷盆地的形成,同时诱发了I-A型花岗岩侵位(年龄集中在135~106 Ma)和中酸性火山喷发。在早白垩世莱阳群下部地层中发现的玄武质火山岩夹层,进行了角闪石40Ar-39Ar和SHRIMP锆石U-Pb测年,结果指示研究区早白垩世伸展构造应力体制起始于130 Ma。最后讨论了晚中生代从挤压到伸展构造应力体制转变的区域动力学背景。

    Abstract:

    Late Mesozoic kinematics history of the two major fault zones (the Zhaoyuan-Pingdu and the Muping-Jimo ones)in the Jiaobei uplift has been studied based on field observations,fault kinematics analysis and paleostress inversion.These were combined with isotopic dating results of volcanic and granitic rocks from this region by using 40Ar-39Ar,SHRIMP and LA-ICPMS techniques,in order to determine the timing of main tectono-magmatic events and the change in tectonic stress regimes.The results show that the Jiaobei uplift experienced the change in tectonic stress regime from Late Jurassic compression to Early Cretaceous extension.Late Jurassic NW-SE compression resulted in crustal thickening and massive emplacements of crustal-derived S-type granites;their ages indicate two thermal events:one occurring in 160~150 Ma,and the other in 147~142 Ma.The deformation was characterized by both low-angle reverse faulting and left-lateral strike-slip faulting along the NNE-striking fault zones in the Jiaobei uplift.During the Early Cretaceous,tectonic stress regime was changed and dominated by NW-SE to NWW-SEE extension.This extension caused the formation of the Jiaolai basin,induced widespread I-A type granite intrusion(aged in 135~106 Ma)and intermediate to acid volcanic activity.40Ar-39Ar hornblendes and SHRIMP zircon U-Pb dating of a basaltic volcanic layer which was found to be intercalated in the lower section of the Early Cretaceous Laiyang Group,indicate that Early Cretaceous extension initiated at ca.130 Ma.Finally discuss geodynamic settings for the change in late Mesozoic tectonic stress regime from compression to extension.

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张田.2008.胶北隆起晚中生代构造-岩浆演化历史[J].地质学报,82(9):1210-1228.
Zhang Tian.2008. Late Mesozoic tectono-magmatic evolution history of the Jiaobei uplift,Jiaodong peninsular[J]. Acta Geologica Sinica,82(9):1210-1228.

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历史
  • 收稿日期:2008-07-25
  • 最后修改日期:2008-07-25
  • 录用日期:2008-07-28
  • 在线发布日期: 2008-09-17
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