CHARACTERISTICS OF THE CRETACEOUS IN THE NORTHERN SOUTH CHINA SEA AND TECTONIC IMPLICATIONS
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摘要: 通过综合分析研究发现,晚中生代时期南海北部构造隆升带存在随时间由北向南逐步迁移:中晚侏罗世广东沿岸开始逐步隆升,大部分地区遭受剥蚀,火山碎屑岩发育,而南海北部则接受了滨浅海相到深海相沉积;早白垩世隆升带向海迁移,广东沿岸发育山间盆地,接受河湖相沉积,在南海北部深海相沉积消失,仅存在海陆过渡相沉积;进入晚白垩世,南海海域整体发生抬升,广东沿岸地区山间盆地范围扩大,陆相地层发育,以陆相洪积扇及河湖相沉积为特征,南海海域大部分地区缺失上白垩统,但在潮汕坳陷发育了一套杂色砂泥岩夹砾岩沉积,含蒸发岩,砂岩中的锆石FT年龄均在75 Ma左右,故地层形成时间应在75 Ma之后,由于上覆新生代地层的约束,该套地层应属晚白垩世,此时潮汕坳陷属前陆盆地,礼乐盆地、巴拉望及民都洛均位于潮汕坳陷南侧或西南侧,属于隆升山脉的一部分。Abstract: The uplift zone in the northern South China Sea had been moving southward with time during the later Mesozoic based on the systematic study of previous data.In the time of Middle-Late Jurassic,the coast areas of Guangdong Province began to gradually uplift and to be eroded,and received lots of pyroclastic deposits,while there deposited littoral-shallow sea facies up to deep sea facies deposits in the northern south China sea.In early Cretaceous,the uplift zone further moved seawards to the south,there were some river and lacustrine deposited in the intermontane basins along the coast of Guangdong Province,and littoral-shallow sea facies in the northern South China Sea.In Late Cretaceous,the major part of the South China Sea were uplift and eroded,while the intermontane basins at the coast areas of Guangdong Province were extensive and filled with the deposits of alluvial fan,riverine and lacustrine sediments,respectively. However,there were some variegated sand and mud rocks,as well as conglomerate and evaporitic deposits in the Chaoshan Sag in Late Cretaceous,The FT age of zircon from sandstone is about 75 Ma,that means that there are some Upper Cretaceous in this sag.It is most possible that the Chaoshan Sag was a foreland basin at that time,and Reed basin,Palawan and Mindoro were located in the south or southwest of the Chaoshan Sag,as part of uplift mountains.
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Key words:
- tectonics /
- foreland basin /
- zircon age /
- South China Sea /
- Mesozoic
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