| 龙胜地区镁铁质侵入体:年龄及其地质意义 |
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| 引用本文： | 葛文春, 李献华, 李正祥, 周汉文. 龙胜地区镁铁质侵入体:年龄及其地质意义[J]. 地质科学, 2001, 36(1): 112-118. |
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| 作者姓名： | 葛文春 李献华 李正祥 周汉文 |
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| 作者单位： | 1. 中国科学院广州地球化学研究所 广州 510640; 2. 西澳大学地质和地球物理系 澳大利亚 WA6009; 3. 中国地质大学地球科学学院 武汉 430074 |
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| 基金项目： | 国家杰出青年科学基金!( 4972 530 9)，中国科学院重大项目!B( KZ951 -B1 -4 1 3-0 1 ) |
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| 摘 要： | 对镁铁质侵入体进行了单颗粒锆石U-Pb年代学和Sm-Nd同位素示踪研究。结果表明:镁铁质侵入体是起源于长期亏损地幔源区的岩浆在760Ma侵位结晶的产物,其侵位过程中遭受地壳物质的混染。该年龄结果限定了丹洲群地层的沉积上限年龄,并为龙胜地区不存在蛇绿岩套的认识提供重要的年代学制约。镁铁质岩浆的形成、侵位可能与Rodinia超大陆～825Ma裂解之后的另一次裂解事件相联系。
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| 关 键 词： | U-Pb年龄 镁铁质侵入体 Rodinia超大陆裂解 广西龙胜 |
| 收稿时间： | 2000-08-15 |
| 修稿时间： | 2000-08-15 |
MAFIC INTRUSIONS IN LONGSHENG AREA:AGE AND ITS GEOLOGICAL IMPLICATIONS |
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| Ge Wenchun, Li Xianhua, Li Zhengxiang, Zhou Hanwen. MAFIC INTRUSIONS IN LONGSHENG AREA: AGE AND ITS GEOLOGICAL IMPLICATIONS[J]. Chinese Journal of Geology, 2001, 36(1): 112-118. |
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| Authors: | Ge Wenchun Li Xianhua Li Zhengxiang Zhou Hanwen |
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| Affiliation: | 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640; 2. Department of Geology and Geophysics, University of Western Australia, Nedlands WA6009, Austral; 3. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 |
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| Abstract: | A study on single zircon U -Pb chronology and Sm-Nd isotopic tracing shows that mafic intrusions derived from a magma characteristic of longly depleted mantle source by the process of emplacement and crystallization, which had ever been contaminated by crustal materials during its ascending course at 760 Ma. This dating result has limited the upper sedimentation age of Danzhou Group, and present an important chronological constraint on the recognition about not existing ophiolite suite in Longsheng area, northern Guangxi. The formation and emplacement of mafic magma may relate to another breakup event after the breakup event of Rodinia supercontinental at ～825 Ma. |
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| Keywords: | U Pb ages The mafic intrusions Rodinia supercontinental breaking up Longsheng area in Guangxi |
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