Characteristics of Meso‐Cenozoic Igneous Complexes in the South Yellow Sea Basin, Lower Yangtze Craton of Eastern China and the Tectonic Setting
Characteristics of Meso‐Cenozoic Igneous Complexes in the South Yellow Sea Basin, Lower Yangtze Craton of Eastern China and the Tectonic Setting
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DOI：
10.1111/1755-6724.13319
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
Yumao Pang;Xun-hua Zhang;Guolin Xiao;Xing-Wei Guo;Zhenhe Wen;Zhiqiang Wu;Xiaoqing Zhu
中科院分区：
文献类型：
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作者：
Yumao Pang;Xun-hua Zhang;Guolin Xiao;Xing-Wei Guo;Zhenhe Wen;Zhiqiang Wu;Xiaoqing Zhu
南黄海盆地部分被东亚大陆中新生代广泛分布的火成岩带所包围。磁异常和多道地震资料都显示了火成岩的普遍存在。初步确定了磁异常与火成岩体的耦合关系。利用多道地震和钻井资料也识别出一些火成杂岩。通过地震相分析，识别出了岩株、岩床、岩脉、岩盖岩和火山碎屑岩等多种侵入和喷出火成岩体。预测了火成杂岩的分布特征。根据磁异常和密集交叉多道地震资料的解释，圈定了50多个浅成侵入体和火山遗迹。是区域地质和盆地演化研究的重要补充。岩浆岩带与断裂的空间匹配关系表明，伸展性的N-E向和N-NE向深断裂可能是岩浆侵入的有效通道。这些断裂是在印支运动后中新生代区域伸展作用的影响下形成的。火成岩体与周围层状沉积地层的同位素年龄和横切关系均表明，岩浆活动可能始于晚侏罗世，早白垩世达到高峰，晚白垩世逐渐减弱，并一直持续到中新世。结合前人的研究，认为中新生代岩浆活动，特别是早白垩世的强烈岩浆活动与古太平洋板块的俯冲作用密切相关。
The South Yellow Sea Basin is partially surrounded by the East Asian continental Meso‐Cenozoic widespread igneous rocks belt. Magnetic anomaly and multi‐channel seismic data both reveal the prevalent occurrence of igneous rocks. We preliminarily defined the coupling relation between magnetic anomalies and igneous rock bodies. Some igneous complexes were also recognized by using multi‐channel seismic and drilling data. We identified various intrusive and extrusive igneous rock bodies, such as stocks, sills, dikes, laccoliths and volcanic edifice relics through seismic facies analysis. We also forecasted the distribution characteristics of igneous complexes. More than fifty hypabyssal intrusions and volcanic relics were delineated based on the interpretation of magnetic anomaly and dense intersecting multi‐channel seismic data. It is an important supplement to regional geology and basin evolution research. Spatial matching relations between igneous rock belts and fractures document that extensional N–E and N–NE‐trending deep fractures may be effective pathways for magma intrusion. These fractures formed under the influence of regional extension during the Meso‐Cenozoic after the Indosinian movement. Isotopic ages and crosscutting relations between igneous rock bodies and the surrounding bedded sedimentary strata both indicate that igneous activities might have initiated during the Late Jurassic, peaked in the Early Cretaceous, gradually weakened in the Late Cretaceous, and continued until the Miocene. Combined with previous studies, it is considered that the Meso‐Cenozoic igneous activities, especially the intensive igneous activity of the Early Cretaceous, are closely associated with the subduction of the Paleo‐Pacific Plate.