| 海南岛琼中地区琼中岩体锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 李孙雄,云平,范渊,周进波.海南岛琼中地区琼中岩体锆石U-Pb年龄及其地质意义[J].大地构造与成矿学,2005,29(2):227-233,241. |
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| 作者姓名： | 李孙雄 云平 范渊 周进波 |
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| 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;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 |
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| 摘 要： | 琼中地区琼中岩体为钙碱性的铝弱过饱和型花岗岩,具有壳源物质来源,岩石普遍发育定向组构,生成于同碰撞期—晚造山期。其锆石U-Pb年龄为226. 5±2. 9~234. 2±2. 3Ma,为晚三叠世。通过区域分析,认为海南岛海西—印支期花岗岩从西往东,具有由老至新的演化规律,形成了略向南面突出的弧状面理构造。表明同期造山活动消减方向由西至东,呈现出剪刀式闭合的特征。
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| 关 键 词： | 岩体时代 地质意义 海南岛 |
| 文章编号： | 1001-1552(2005)02-0227-08 |
ZIRCON U- PB AGE AND ITS GEOLOGICAL SIGNIFICANCE FOR QIONGZHONG PLUTON IN QIONGZHONG AREA, HAINAN ISLAND |
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| LI Sunxiong,YUN Ying,FAN Yuan,Zhou Jinbo.ZIRCON U- PB AGE AND ITS GEOLOGICAL SIGNIFICANCE FOR QIONGZHONG PLUTON IN QIONGZHONG AREA, HAINAN ISLAND[J].Geotectonica et Metallogenia,2005,29(2):227-233,241. |
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| Authors: | LI Sunxiong YUN Ying FAN Yuan Zhou Jinbo |
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| Abstract: | Qiongzhong pluton was formed by slender supersaturation calc-alkalic granites, with involvement of crustal materials in the rock constituents. Orientated fabrics are very common, which suggests that it was formed during apposition-collision in the late orogenic period. The Zircon U-Pb dating gives results of 226.5±2.9 - 234.2±2.3 Ma, indicating that it belongs to Late Triassic. Regional geological study suggests that from east to west the Hercynian-Indosinian granites in Hainan Island show an evolution trend of increasingly younger ages and demonstrate an arc-shaped foliation structure. These suggest that the termination direction of the orogenic movement is characterized by shear convergence extending from west to east. |
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| Keywords: | pluton age geological significance Hainan island |
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