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Sm-Nd isotopic age and genesis of gabbro xenoliths in Daoxian County, Hunan Province 被引量:15
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作者 Guo, F Fan, WM +1 位作者 Lin, G Lin, YX 《Chinese Science Bulletin》 SCIE EI CAS 1997年第21期1814-1817,共4页
MANY geologists pay attention to Mesozoic tectonomagmatic activity and the associating multi-metal ore deposits in South China. However, the age of the transformatiori of tectonic regimein the area is little studied. ... MANY geologists pay attention to Mesozoic tectonomagmatic activity and the associating multi-metal ore deposits in South China. However, the age of the transformatiori of tectonic regimein the area is little studied. Occurrence of gabbro xenoliths in Mesozoic alkaline basalts inDaoxian region, Hunan Province, shows that the lithosphere in the region was intensely ex-tended and thinned during the Mesozoic, followed by underplating of mantle-derived mag- 展开更多
关键词 gabbro xenoliths SM-ND DATING petrogenesis.
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湖南省宁远──道县中生代玄武岩中辉长岩包体的岩石学初步研究 被引量:13
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作者 郭锋 吴有林 +1 位作者 范蔚茗 林舸 《大地构造与成矿学》 EI CAS CSCD 1996年第1期38-45,共8页
宁远-道县中生代玄武岩中辉长岩包体的岩石学、矿物学等特征表明辉长岩与寄主玄武岩分属不同系列岩石。辉长岩为偏碱性拉斑质玄武岩的分异结晶产物,类似于似层状基性侵入体。它代表了本区较早的基性岩浆熔融和侵位事件,可能是地洼活... 宁远-道县中生代玄武岩中辉长岩包体的岩石学、矿物学等特征表明辉长岩与寄主玄武岩分属不同系列岩石。辉长岩为偏碱性拉斑质玄武岩的分异结晶产物,类似于似层状基性侵入体。它代表了本区较早的基性岩浆熔融和侵位事件,可能是地洼活动阶段早期的一种深部岩石圈活动表现。 展开更多
关键词 中生代 玄武岩 辉长岩包体 岩石学特征
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湘南道县辉长岩包体的锆石LA-ICP-MS定年、Hf同位组成及其地质意义 被引量:4
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作者 孔华 许明珠 +2 位作者 张强 唐宇蔷 赵佳进 《吉林大学学报(地球科学版)》 EI CAS CSCD 北大核心 2016年第3期627-638,共12页
道县虎子岩碱性玄武岩筒产出较多的辉长岩包体。用于锆石定年的辉长岩样品的岩石化学特征显示:其K_2O、Fe_2O_3、TiO_2高于其他同类样品,稀土元素、微量元素总量也相对较高,样品的K*值(2K_N/(Ta_N+La_N))为7.60>1,显示岩浆具有亲岛... 道县虎子岩碱性玄武岩筒产出较多的辉长岩包体。用于锆石定年的辉长岩样品的岩石化学特征显示:其K_2O、Fe_2O_3、TiO_2高于其他同类样品,稀土元素、微量元素总量也相对较高,样品的K*值(2K_N/(Ta_N+La_N))为7.60>1,显示岩浆具有亲岛弧性质,反映源区地幔受到较强的交代作用;Nb*值(2Nb_N/(K_N+La_N))为0.11<1,反映基性岩浆侵入时受到了地壳混染;辉长岩中的锆石具有清晰的韵律环带,Th/U值=0.91~4.35,具有岩浆锆石的特征;锆石^(206)Pb/^(238)U加权平均年龄为(201.50±0.53)Ma,代表了辉长岩的结晶年龄;ε_(Hf)(t)值为-0.88~4.45,投点落入球粒陨石附近,暗示强烈的壳幔交换作用;Hf模式年龄平均为751 Ma,反映早期地壳对岩石源区的贡献。Hf同位素组成特征反映辉长质岩浆是在印支晚期局部拉张背景下,岩石圈上地幔上隆减压熔融的产物。 展开更多
关键词 辉长岩包体 锆石U-PB定年 Hf同位素示踪 道县
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A PERTOLOGICAL STUDY ON THE GABBRO XENOLITHS IN MESOZOIC BASALTS IN NINGYUAN-DAOXIAN REGION, HUNAN PROVINCE, CHINA
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作者 Guo Feng Wu Youlin Fan Weiming and Lin Ge(Changsha Institue of Geotectonics, Academia, Sinica, 410013) 《Geotectonica et Metallogenia》 1995年第4期78-85,共8页
Petrological and mineralogical characteristics of gabbro xenoliths in Mesozoic basalts in Ningyuan-Daoxian region, Huan province show that they belong to different rock series. The basalt is similar to alkline basalt ... Petrological and mineralogical characteristics of gabbro xenoliths in Mesozoic basalts in Ningyuan-Daoxian region, Huan province show that they belong to different rock series. The basalt is similar to alkline basalt of an intracontinental rift ; while the gabbro xenolith shows that it is the differentiated outcrop of tholeiitic lava, similar to that of layer-shaped basic pluton. The gabbro xenolith represents an early intrusion of basic melt and the melting event is probably the earlier menifestation of lithosphere mibilization in Mesozoic in the South China. 展开更多
关键词 MESOZOIC BASALTS gabbro xenoliths PETROLOGICAL characteristics Ningyuan-Daoxian
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