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海南岛南部侏罗系的发现——来自碎屑锆石U-Pb年龄及Hf同位素的证据
引用本文:胡在龙,王勇,赵小明,魏昌欣,林义华,袁海军,蒙忠盈,吴年文.海南岛南部侏罗系的发现——来自碎屑锆石U-Pb年龄及Hf同位素的证据[J].地质通报,2019,38(10):1740-1757.
作者姓名:胡在龙  王勇  赵小明  魏昌欣  林义华  袁海军  蒙忠盈  吴年文
作者单位:海南省地质调查院, 海南 海口 570206,海南省地质调查院, 海南 海口 570206;中南大学地球科学与信息物理学院, 湖南 长沙 410083,中国地质调查局武汉地质调查中心, 湖北 武汉 430223,海南省地质调查院, 海南 海口 570206,海南省地质调查院, 海南 海口 570206,海南省地质调查院, 海南 海口 570206,海南省地质调查院, 海南 海口 570206,中国地质调查局武汉地质调查中心, 湖北 武汉 430223
基金项目:中国地质调查局项目《海南1:5万保亭县、藤桥、新村港、黎安幅区域地质调查》(编号:DD20160035-09)、《国家地质数据库建设与整合》(编号:DD20160029)、《地质调查综合智能编图系统与应用》(编号:DD20190415)、国家自然科学基金项目《海南岛古特提斯洋壳的地层古生物判据及海西期构造演化》(批准号:41672030)和《早三叠世海、陆相地层对比及生物-环境演变过程》(批准号:41530104)
摘    要:海南岛一直被认为缺失侏罗纪沉积记录,指示了海南岛与大陆内部不一样的中生代演化特征。对海南岛南部三亚地区尖岭剖面和海螺岭剖面紫红色碎屑岩,以及早白垩世鹿母湾组进行了详细的野外地质调查和碎屑锆石U-Pb同位素分析。结果表明,尖岭剖面和海螺岭剖面的紫红色碎屑岩具有高度一致的碎屑锆石年龄谱,限定的最大沉积年龄为172~174Ma,完全不同于下伏晚奥陶世榆红组和海南岛早白垩世鹿母湾组沉积岩的碎屑锆石年龄谱。综合区域构造-岩浆活动和中-新生代碎屑锆石年代学分析结果及尖岭剖面紫红色碎屑岩中锆石Hf同位素特征,认为海南岛三亚地区尖岭和海螺岭紫红色碎屑岩应沉积于172~158Ma之间,属于中-晚侏罗世沉积岩。其沉积物源和构造背景与广东东部和福建沿海同时代沉积岩相似,指示华南东南沿海地区在中-晚侏罗世具有统一的大地构造背景。

关 键 词:海南岛  侏罗系  碎屑锆石  U-Pb年代学  Hf同位素
收稿时间:2019/6/16 0:00:00
修稿时间:2019/8/14 0:00:00

The identification of Jurassic stratigraphy in southern Hainan Island: Evidence from detrital zircon U-Pb ages and Hf isotopic compositions
HU Zailong,WANG Yong,ZHAO Xiaoming,WEI Changxin,LIN Yihu,YUAN Haijun,MENG Zhongying and WU Nianwen.The identification of Jurassic stratigraphy in southern Hainan Island: Evidence from detrital zircon U-Pb ages and Hf isotopic compositions[J].Geologcal Bulletin OF China,2019,38(10):1740-1757.
Authors:HU Zailong  WANG Yong  ZHAO Xiaoming  WEI Changxin  LIN Yihu  YUAN Haijun  MENG Zhongying and WU Nianwen
Institution:Hainan Geological Survey Institute, Haikou 570206, Hainan, China,Hainan Geological Survey Institute, Haikou 570206, Hainan, China;School of Geosciences and Info-physics, Central South University, Changsha 410083, Hu''nan, China,Wuhan Center of China Geological Survey, Wuhan 430223, Hubei, China,Hainan Geological Survey Institute, Haikou 570206, Hainan, China,Hainan Geological Survey Institute, Haikou 570206, Hainan, China,Hainan Geological Survey Institute, Haikou 570206, Hainan, China,Hainan Geological Survey Institute, Haikou 570206, Hainan, China and Wuhan Center of China Geological Survey, Wuhan 430223, Hubei, China
Abstract:The Hainan Island has long been considered as lacking the Jurassic deposition, which suggests that Hainan Island and interior continent have different Mesozoic evolutions. In this study, the authors conducted detrital zircon U-Pb analysis for the fuchsia clastic rocks in the Jianling and Hailuoling section and the Early Cretaceous Lumuwan Formation rocks, which are located at Sanya, southern Hainan. The zircon U-Pb dating results of the fuchsia clastic rocks from the two sections illustrate similar age spectra and oldest depositional age (172~174Ma). They are completely different from the spectrum of the underlying Late Ordovician Yuhong Formation and Early Cretaceous Lumuwan Formation samples. Together with previous tectonic and igneous activity records as well as the zircon Hf isotopic characteristics of the fuchsia clastic rocks, the authors hold that the deposition of the fuchsia clastic rocks in Jianling and Hailuoling must have occurred during 172~158Ma in the Middle-Late Jurassic periods. The sedimentary provenance and tectonic background were similar to those of the contemporary sedimentary rocks in eastern Guangdong and Fujian, indicating a uniform tectonic environment during the Middle-Late Jurassic in the southeast coastal area of South China.
Keywords:Hainan Island  Jurassic  detrital zircon  U-Pb chronology  Hf isotope
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