南雄盆地下坪花岗岩基底LA-ICP-MS锆石U-Pb年代学
LA-ICP-MS Zircon U-Pb Geochronology of Underlying Granite Basement of Xiaping Red Stratum in Nanxiong Basin
DOI: 10.12677/AG.2015.53018, PDF,    国家科技经费支持
作者: 李宏卫：广东省地质调查院，广东 广州
关键词: 南雄盆地；下坪；花岗岩基底；LA-ICP-MS锆石U-Pb年代学；Nanxiong Basin； Xiaping； Granite Basement； LA-ICP-MS Zircon U-Pb Geochronology
摘要: 广东南雄享有“中国恐龙之乡”的美誉。本文对南雄市下坪恐龙蛋化石保护点花岗岩基底开展了单颗粒锆石U-Pb年代学研究，获得中粒斑状黑云母二长花岗岩岩浆结晶年龄217.1 ± 2.2 Ma (MSWD = 1.3)，表明下坪红层与印支期花岗岩(γ15)基底呈侵蚀不整合接触。南雄盆地周围发育众多印支期岩浆岩，结合区域资料，表明粤北南雄地区中生代早期(T3-K1)处于长期的风化剥蚀状态，于早白垩世南雄地区现今盆山地貌才略具雏形。
Abstract: The Nanxiong city, Guangdong province, has a famous reputation for being named “Chinese Dino-saur Town”. This paper carries out research on single grain zircon U-Pb geochronology of underlying granite basement of Xiaping red stratum in Nanxiong basin, and gets the middle grained porphyritic biotite monzonitic granite magma crystallization age of 217.1 ± 2.2 Ma (MSWD = 1.3), and it shows that the contact relationship between Xiaping red stratum and underlying Indosinian granites (γ15) is erosion unconformity. There are lots of Indosinian granite bodies around Nanxiong basin; combined with regional geological data, it shows that the Nanxiong area in Northern Guangdong province was in the state of long-term weathering and denudation in the early Mesozoic in (T3-K1), and the basin and mountain topography of Nanxiong area just began to appear in the early Cretaceous.
文章引用：李宏卫. 南雄盆地下坪花岗岩基底LA-ICP-MS锆石U-Pb年代学[J]. 地球科学前沿, 2015, 5(3): 148-153. https://dx.doi.org/10.12677/AG.2015.53018

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