| 山东东部早白垩世青山期穿地壳岩浆系统与热隆滑脱成盆 |
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| 引用本文： | 周瑶琪,周腾飞,马昌前,张振凯,董诗绘,辜洋建,尹兴城,李曼洁,梁文栋.山东东部早白垩世青山期穿地壳岩浆系统与热隆滑脱成盆[J].地球科学,2018,43(10):3373-3390. |
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| 作者姓名： | 周瑶琪 周腾飞 马昌前 张振凯 董诗绘 辜洋建 尹兴城 李曼洁 梁文栋 |
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| 作者单位： | 1.中国石油大学地球科学与技术学院, 山东青岛 266580 |
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| 基金项目： | 山东省重大科技创新工程项目2017CXGC1608国家自然科学基金项目41772190自主创新科研计划项目18CX06019A |
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| 摘 要： | 穿地壳岩浆系统模型是近年新提出的一个全新的岩浆系统概念.聚焦山东东部早白垩世青山期穿地壳岩浆系统，在野外地质踏勘的基础上，结合火成岩年代学、断裂体系分布、大地构造学与地球化学的相关研究成果，系统探讨了不同性质火山岩浆的时空演化与分布特征.首先，在时间序列上，早白垩世青山期穿地壳岩浆系统，表现为酸性岩浆侵位-基性岩浆侵入-中性岩浆喷发的特征；其次，在不同的地壳深度，穿地壳岩浆系统有不同的表现，由深到浅，呈现岩基/岩株-岩脉岩墙-火山机构的变化；空间分布上，酸性岩体多位于古隆起区，火山机构沿深大断裂呈现串珠状分布.穿地壳岩浆系统的发育特征指示了青山期岩石圈的构造特征:岩体自身近E-W向展布，说明岩体侵入时的中上地壳的断裂体系主要为近E-W向，而岩体整体上沿着NE-SW向分布，说明了更深部断裂体系主要为NE-SW向，控制了整个区域构造的发育.早白垩世早期（莱阳期）区域发育的浅层构造断裂系统为早白垩世晚期（青山期）的穿地壳岩浆系统的发育提供了通道.早白垩世青山期穿地壳岩浆系统的发育伴随着区域热隆-伸展-滑脱作用，在此过程中山东东部青山期盆地格局形成.花岗岩抬升速率初步计算的结果表明山东东部地区早白垩世青山期的热隆速率略快于2.7~4.1 mm/a，强烈的"热隆-伸展-滑脱"作用是同期沉积盆地形成的主要动力学机制.
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| 关 键 词： | 山东东部 白垩纪 穿地壳岩浆系统 成盆动力学 石油地质 |
| 收稿时间： | 2018-05-04 |
Transcrustal Magmatic System of Early Cretaceous (Qingshan Stage) in Eastern Shandong and the Basin Formation Related to "Thermal Upwelling-Detachment" |
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| Abstract: | A new conception of magmatic system-transcrustal magmatic system(TMS) has been raised recently. This paper focuses on the TMS of Early Cretaceous (Qingshan stage) in Eastern Shandong. Based on the geological field work and the research results of igneous chronology, distribution of fault system, tectonics and geochemistry, we discuss the temporal and spatial evolution and distribution characteristics of different volcanic magmatism. Firstly, the TMS varies from silicic magmatic emplacement to basic magmatic intrusion and then to medium magmatic eruption. Secondly, the TMS owes different behaviors at different depths of crust:from deep to shallow, TMS behaves in the sequence of Batholith/Stock-Intrusions/Dike-volcanic edifice. Thirdly, the silicic batholith/stock is mainly distributed in old uplift zone, while the volcanic edifice is mainly distributed along the deep fault. The development of TMS indicates the structure characteristics of lithosphere in Qingshan stage:The nearly E-W distribution of the stock itself shows the fault system in upper crust is nearly E-W when the magma flows upward. While the distribution of all the batholiths/stocks is in the direction of NE-SW, indicating that the deep fault system is in the direction of NE-SW, which controls the regional tectonic evolution. In Early Cretaceous, the shallow fault system developed in Laiyang stage provided the channel for the TMS developed in Qingshan stage. In the development period of TMS, there was strong "thermal-upwelling, stretching and detachment" effect, which resulted in the basin framework in Qingshan stage. The calculated rate of granite uplift related to thermal-upwelling is slightly faster than 2.47-3.7 mm/a. The intense "thermal-upwelling, stretching and detachment" effect is the main dynamic mechanism of basin formation in Qingshan stage. |
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