黔东南宰便新元古代镁铁-超镁铁质岩地球化学
Geochemistry of Neoproterozoic Mafic-Ultramafic Rocks in Zaibian, SE Guizhou Province, China
查看参考文献24篇
|
文摘
|
在黔东南从江宰便地区进行地质填图过程中发现一处镁铁-超镁铁质岩体, 该岩体属新元古代钙碱质岩系, 矿物成分主要为长石、辉石和绿泥石等. 其主量成分以高Na_2O(5.04% ~6.64% ), CaO(0.76% ~6.67% )和MgO(6.79% ~7.88% ), 低TiO_2(0.30% ~0.4% ), 贫K_2O(0.10% ~0.29% )和P_2O_5(0.04% ~0.05% )为特征. 稀土总量ΣREE较高, 为83.37×10~(-6)~164.97×10~(-6), 其LREE/HREE和(La/Yb)N变化较大, 分别为 3.50~7.25和2.90~7.58, 表明轻和重稀土分馏较大, (La/Sm)_N和(Gd/Yb)_N相对较小, 分别为1.81~3.19和1.22~1.53, 表明轻稀土和重稀土内部分馏较小. 在球粒陨石标准化图解上, 为轻稀土富集, 无Eu、Ce明显异常的平坦型;在原始地幔标准化曲线上出现较为明显的Nb、Ta负异常. 微量元素及Y/Nb、Zr/Nb等参数暗示其为过渡-富集型地幔部分熔融的产物. 综合研究表明该岩体形成于约800Ma的板内拉张环境, 可能与导致 Rodinia超大陆裂解的地幔柱有关. |
|
其他语种文摘
|
The NeoProterozoic mafic-ultramafic rocks have been found in Zaibian area by geologic mapping. The mafic-ultramafic rocks are belonging to calc-alkaline; the minerals compositions are mainly feldspar, pyroxene and chlorite of the mafic-ultramafic rocks. The major elements have the characteristics of high contents of Na_2O (5. 04% -6.64%), CaO (0. 76% -6.67%) and MgO (6.79% -7.88%), low contents of TiO_2, (0. 30% ~ 0. 4%), and poor contents of K_2O (0. 10% -0. 29% ) and P_2O_5(0. 04% -0. 05% ). The ∑REE is relatively high with 83. 37 x 10~(-6) - 164. 97 × 10~(-6), and the variety values of LREE/HREE and (La/Yb)_N are relatively large, indicating that the fractionation between light rare earth elements and heavy rare earth elements is existent. However, the (La/Sm)_N and (Gd/Yb)_N are relatively less, with 1. 81 -3. 19 and 1. 22 - 1. 53, respectively, reflecting that the fractionation of light rare earth elements and heavy rare earth elements is feebly. The Zaibian mafic-ultramafic rocks are LREE enriched, and have no evident Eu, with Ce abnormity, but have evident Nb, and anomaly negative Ta. The trace elements, Y/Nb, and Zr/Nb imply that the mafic-ultramafic rocks maybe originated from the Transition- Enriched-Mantle. The results indicate that the mafic-ultramafic rocks maybe formed in the inner-plate at about 800 Ma, and maybe related with the mantle plume which makes the Rodinia breakup. |
|
来源
|
矿物学报
,2010,30(2):215-222 【核心库】
|
|
关键词
|
镁铁-超镁铁质岩体
;
地球化学
;
新元古代
;
从江宰便
|
|
地址
|
1.
贵州省地矿局102地质大队, 贵州, 遵义, 563003
2.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1000-4734 |
|
学科
|
地质学 |
|
基金
|
国家973计划
;
中国科学院贵阳地球化学研究所矿床地球化学中国科学院重点实验室基金
;
中国科学院地球化学研究所与贵州地矿局102队合作项目
|
|
文献收藏号
|
CSCD:3914307
|
参考文献 共
24
共2页
|
|
1.
李献华. 广西北部新元古代花岗岩锆石U-Pb年代学及其构造意义.
地球化学,1999,28(1):1-9
|
CSCD被引
116
次
|
|
|
|
|
2.
Li Z X. The breakup of Rodinia: Did it start with a mantle plume beneath South China?.
EPSL,1999,173:171-181
|
CSCD被引
339
次
|
|
|
|
|
3.
李献华. 华南新元古代花岗岩的锆石U-Pb年龄及其构造意义.
矿物岩石地球化学通报,2001,20(4):271-273
|
CSCD被引
94
次
|
|
|
|
|
4.
Li X H. Neoproterozoic granitoids in South China: Crustal melting above a mantle plume at ca. 825 Ma?.
Precamb Res,2003,122:45-83
|
CSCD被引
360
次
|
|
|
|
|
5.
Li Z X. Grenvillian continental collision in South China: New SHRIMP U-Pb zircon results and implications for the configuration of Rodinia.
Geology,2002,30:163-166
|
CSCD被引
274
次
|
|
|
|
|
6.
Li X H. U-Pb zircon geochronology, geochemistry and Nd isotopic study of Neoproterozoic bimodal volcanic rocks in the Kangding Rift of South China : Implications for the initial rifting of Rodinia.
Precamb Res,2002,113:135-155
|
CSCD被引
209
次
|
|
|
|
|
7.
Li Z X. Geochronology of Neoproterozoic syn-rift magmatism in the Yangtze Craton, South China and correlations with other continents: Evidence for a superplume that broke up Rodinia.
Precamb Res,2003,122:85-109
|
CSCD被引
472
次
|
|
|
|
|
8.
Ling W. Neoproterozoic tectonic evolution of the northwestern Yangtze Craton, South China: Implications for amalgamation and breakup of the Rodinia supercontinent.
Precamb Res,2003,122:111-140
|
CSCD被引
29
次
|
|
|
|
|
9.
凌文黎. 扬子北缘晋宁期望江山基性岩体的地球化学特征及其构造背景.
矿物岩石地球化学通报,2001,20:218-221
|
CSCD被引
34
次
|
|
|
|
|
10.
Zhou M F. SHRIMP U-Pb zircon geochronological and geochemical evidence for Neoproterozoic arc magmatism along the western margin of the Yangtze Block, South China.
EPSL,2002,196:51-67
|
CSCD被引
420
次
|
|
|
|
|
11.
Zhou M F. Neoproterozoic arc-related mafic intrusions along the Northern margin of South China: Implications for the accretion of Rodinia.
J Geol,2002,110:611-618
|
CSCD被引
164
次
|
|
|
|
|
12.
颜丹平. 华南在Rodinia古陆中的位置的讨论--扬子地块西缘变质岩浆杂岩的证据及其与Seychelles地块的对比.
地学前缘,2002,9(4):49-50
|
CSCD被引
4
次
|
|
|
|
|
13.
邱检生. 桂北前寒武纪花岗岩类岩石的地球化学与成因.
岩石矿物学杂志,2002,21(3):197-208
|
CSCD被引
21
次
|
|
|
|
|
14.
周金城. 桂北中－新元古代镁铁质－超镁铁质岩的岩石地球化学.
岩石学报,2003,19(1):9-18
|
CSCD被引
50
次
|
|
|
|
|
15.
曾昭光. 贵州宰便-高武地区中新元古代火山岩的发现及其意义.
贵州地质,2003,20(3):135-138
|
CSCD被引
15
次
|
|
|
|
|
16.
曾雯. 黔东南新元古代岩浆岩单颗粒锆石U-Pb年龄及其构造意义.
地球化学,2005,34(6):548-556
|
CSCD被引
52
次
|
|
|
|
|
17.
杨德智. 黔东南那哥铜多金属矿床地质地球化学.
矿物岩石地球化学通报,2010,29(2)
|
CSCD被引
1
次
|
|
|
|
|
18.
Qi L. Determination of trace elements in granites by inductively coupled plasma mass spectrometry.
TALANTA,2000,51(3):507-513
|
CSCD被引
459
次
|
|
|
|
|
19.
Wang J. Zircon SHRIMP U-Pb dating for the Cangshuipu volcanic rocks and its implications for the lower boundary age of the Nanhua strata in South China.
Chinese Science Bulletin,2003,48:1663-1669
|
CSCD被引
39
次
|
|
|
|
|
20.
Li Z X. South China in Rodinia: Part of the missing link between Australia-East Antarctica and Laurentia?.
Geology,1995,23:407-410
|
CSCD被引
244
次
|
|
|
|
|
了解气象卫星更多信息，请访问