Discovery of Late Ordovician- Early Silurian graptolites and its Significance in Daguangba area of Hainan Island.
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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。Abstract: The Ordovician-Silurian graptolites, which were identified as diplograptid, were firstly discovered in light-metamorphosed rock series in Daguangba in western Hainan Island. However, there was long-term de-bate on the age of the light metamorphic strata, it has been regarded as the Cambrian, Pre-Devonian, Devoni-an-Carboniferous, Carboniferous and Permian. The discovery of the graptolite fossils not only offered new evi-dences for the age of the fosils-bearing strata and further confirmed the occurrence of the late Ordovician to early Silurian strata in central-north Hainan Island, but also for Ordovician-Silurian stratigraphic division and correlation of the deep-water facies, and playing important roles in the research on paleobiogeographic provincialization, sedimentary facies and sedimentary tectonic background of Hainan Island and adjacent area.
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Key words:
- graptolite /
- Late Ordovician-Early Silurian /
- sedimentary facies /
- Daguangba /
- Hainan Island
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