中国东部北黄海盆地东部坳陷岩浆活动特征及其与区域构造的耦合关系
发布时间：2018-11-05 13:26
【摘要】：如何深入了解中国东部北黄海盆地东部坳陷岩浆活动特征是目前研究的前沿之一.为探讨早白垩世异常剧烈岩浆活动的区域构造成因并揭示中国东部的构造动力学机制,利用井-震及岩浆岩测试资料,对北黄海盆地岩浆活动特征及其与区域构造的耦合关系进行研究.在空间上刻画了岩浆的侵入相、喷出相的地震反射特征及沿深大断裂展布的平面分布特征;在时间上划分出了包括早白垩世108~115Ma、134~145Ma在内的4期岩浆活动.结合区域地质分析认为早白垩世早期,伊泽奈琦板块沿北北西斜向俯冲于欧亚板块之下,太平洋板块向南西方向俯冲,板块剪切作用导致郯庐断裂带左旋走滑,使得盆地处于左旋伸展环境中,内部形成派生的北西向右旋、近南北向左旋的次级共轭断裂系并控制岩浆上侵底辟活动.经过综合分析,厘清了盆地岩浆活动及断裂演化过程与区域板块运动之间的耦合关系.
[Abstract]:How to deeply understand the characteristics of magmatic activity in the eastern depression of the northern Huang Hai basin in eastern China is one of the frontier studies at present. In order to study the regional tectonic genesis of the anomalous magmatic activity in early Cretaceous and to reveal the tectonic dynamic mechanism of eastern China, well-earthquake and magmatic rock testing data were used. The characteristics of magmatic activity and its coupling with regional tectonics in the northern Huang Hai basin are studied. In space, the intrusive facies of magma, the seismic reflection characteristics of the ejection facies and the plane distribution along the deep fault are characterized, and the four periods of magmatic activity, including the early Cretaceous 108-115Ma-134Ma, are divided into four periods. Combined with regional geological analysis, it is concluded that in the early Cretaceous, the Yizenaiqi plate subducted under the Eurasian plate along the north-northwest oblique direction, the Pacific plate subducted southwestward, and the plate shear resulted in the left-lateral strike-slip of the Tanlu fault zone. The basin is in a left-lateral extensional environment and forms a derived north-west right-handed subconjugate fault system near the south-north direction and controls magmatic diapir activity. Through comprehensive analysis, the coupling relationship between magmatic activity and fault evolution process and regional plate movement in the basin is clarified.
【作者单位】： 中国地质大学资源学院;中国地质大学构造与油气资源教育部重点实验室;中石化重庆涪陵页岩气勘探开发有限公司;
【基金】：国家十三五油气重大子课题(No.2016ZX05025002-003) 国家基础地质调查项目(No.12120114055801) 111引智项目(No.B14031)
【分类号】：P736
本文编号：2312230
[Abstract]:How to deeply understand the characteristics of magmatic activity in the eastern depression of the northern Huang Hai basin in eastern China is one of the frontier studies at present. In order to study the regional tectonic genesis of the anomalous magmatic activity in early Cretaceous and to reveal the tectonic dynamic mechanism of eastern China, well-earthquake and magmatic rock testing data were used. The characteristics of magmatic activity and its coupling with regional tectonics in the northern Huang Hai basin are studied. In space, the intrusive facies of magma, the seismic reflection characteristics of the ejection facies and the plane distribution along the deep fault are characterized, and the four periods of magmatic activity, including the early Cretaceous 108-115Ma-134Ma, are divided into four periods. Combined with regional geological analysis, it is concluded that in the early Cretaceous, the Yizenaiqi plate subducted under the Eurasian plate along the north-northwest oblique direction, the Pacific plate subducted southwestward, and the plate shear resulted in the left-lateral strike-slip of the Tanlu fault zone. The basin is in a left-lateral extensional environment and forms a derived north-west right-handed subconjugate fault system near the south-north direction and controls magmatic diapir activity. Through comprehensive analysis, the coupling relationship between magmatic activity and fault evolution process and regional plate movement in the basin is clarified.
【作者单位】： 中国地质大学资源学院;中国地质大学构造与油气资源教育部重点实验室;中石化重庆涪陵页岩气勘探开发有限公司;
【基金】：国家十三五油气重大子课题(No.2016ZX05025002-003) 国家基础地质调查项目(No.12120114055801) 111引智项目(No.B14031)
【分类号】：P736
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