海南岛西部大广坝地区晚奥陶世-早志留世笔石地层的发现及意义  

Discovery of Late Ordovician- Early Silurian graptolites and its Significance in Daguangba area of Hainan Island

作　　者：龙文国[1,2] 周岱[1,2] 王晶[1,2] 柯贤忠[1,2] 周建波[3] 汪焰华[3] 

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205 [2]中国地质调查局花岗岩成岩成矿地质研究中心,武汉430205 [3]海南省地质调查院,海口570206

出　　处：《华南地质与矿产》2016年第1期10-14,共5页Geology and Mineral Resources of South China

基　　金：中国地质调查局项目"钦杭西段关键地区区域地质调查(12120113066400)";国家自然基金项目"广西泥盆纪双壳动物系统古生物学及多样性演变(41172025)"资助

摘　　要：笔者于海南岛西部大广坝地区一套浅变质岩系中首次发现晚奥陶世-早志留世笔石,经鉴定属双笔石类。有关此套地层的时代归属长期存在争议,先后划归为寒武纪、前泥盆纪、泥盆纪-石炭纪、石炭纪、二叠纪,笔石的发现为其时代归属提供了依据,并进一步证实了该区晚奥陶纪-早志留纪地层的存在,为海南岛中北部地区奥陶纪-志留纪深水相地层的划分与对比、时代归属、及海南岛含笔石地层的研究提供了新资料,对古生物地理分区、沉积相、沉积大地构造背景及大地构造格局的研究也具重要意义。The Ordovician-Silurian graptolites, which were identified as diplograptid, were firstly discoveredin light-metamorphosed rock series in Daguangba in western Hainan Island. However, there was long-term debateon the age of the light metamorphic strata, it has been regarded as the Cambrian, Pre-Devonian, Devonian-Carboniferous, Carboniferous and Permian. The discovery of the graptolite fossils not only offered new evidencesfor the age of the fosils-bearing strata and further confirmed the occurrence of the late Ordovician toearly Silurian strata in central-north Hainan Island, but also for Ordovician-Silurian stratigraphic division andcorrelation of the deep-water facies, and playing important roles in the research on paleobiogeographicprovincialization, sedimentary facies and sedimentary tectonic background of Hainan Island and adjacent area.

关 键 词：笔石 晚奥陶世-早志留世 沉积相 大广坝 海南岛 

分 类 号：P534.42[天文地球—古生物学与地层学] P534.43[天文地球—地质学]