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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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This study was financially supported by The National Special Project for Marine Geology (DD20160147), the National Basic Research Program of China (973 program; Grant No. 2013CB429701) and the National Natural Science Foundation of China (Grant No.41210005). Database for basin modeling were supported by Qingdao Institute of Marine Geology (QIMG), China. We would like to sincerely thank the QIMG for permission to publish relevant data. Several responsible reviewers are thankworthy for their significant suggestions that helped improved the manuscript quality.

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    Abstract:

    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.

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PANG Yumao, ZHANG Xunhua, XIAO Guolin, GUO Xingwei, WEN Zhenhe, WU Zhiqiang, ZHU Xiaoqing.2017. Characteristics of Meso-Cenozoic Igneous Complexes in the South Yellow Sea Basin, Lower Yangtze Craton of Eastern China and the Tectonic Setting[J]. Acta Geologica Sinica(),91(3):971-987

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History
  • Received:March 05,2016
  • Revised:October 13,2016
  • Online: June 08,2017
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