| 贵州锦屏地区新元古代下江群地球化学特征及构造环境研究 |
| |
| 引用本文： | 牟军,罗香建,王安华,张厚松,覃永军,刘天强,吴滔.贵州锦屏地区新元古代下江群地球化学特征及构造环境研究[J].高校地质学报,2015,21(1):68. |
| |
| 作者姓名： | 牟军 罗香建 王安华 张厚松 覃永军 刘天强 吴滔 |
| |
| 作者单位： | 贵州省地质调查院,贵阳,550000 |
| |
| 基金项目： | 中国地质调查局贵州1∶5万锦屏、远口、平略、同古4幅区域地质矿产调查项目，贵州省地矿局地质科研项目 |
| |
| 摘 要： | 对贵州锦屏新元古代下江群地层剖面常量元素及稀土元素系统分析结果表明,该区下江群地层常量元素具有中等Si O2含量,介于57.54%~88.91%之间,平均68.32%,较低的Ca O含量(一般1%),较高的K2O/Na2O,Al2O3/Ti O2比值及较低的TFe2O3+Mg O含量。稀土总量ΣREE介于46.5×10-6~306.3×10-6之间,平均值为152.5×10-6,ΣLREE/ΣHREE为8.73~21.6,平均12.96,表明轻稀土相对富集,重稀土相对亏损;下江群各组段δEu在0.7~0.8之间,为弱负异常。稀土配分模式总体为右倾,而轻稀土分馏中等,重稀土分馏较低,表现在稀土配分曲线为轻稀土斜率较大,重稀土趋于平坦。通过各组段地球化学特征参数与参数投点可得:番召组与清水江组、平略组与隆里组具有相似地球化学特征,表明其构造环境相似且呈过渡变化,初步认为番召组与清水江组形成于活动大陆边缘的弧后盆地沉积,而平略组与隆里组为大陆边缘的边缘海沉积。
|
| 关 键 词： | 地球化学 构造环境 下江群 新元古代 贵州省 |
Geochemistry and Tectonic Setting of the Neoproterozoic Xiajiang Group in Jinping,Guizhou Province |
| |
| MOU Jun,LUO Xiangjian,WANG Anhua,ZHANG Housong,QIN Yongjun,LIU Tianqiang,WU Tao.Geochemistry and Tectonic Setting of the Neoproterozoic Xiajiang Group in Jinping,Guizhou Province[J].Geological Journal of China Universities,2015,21(1):68. |
| |
| Authors: | MOU Jun LUO Xiangjian WANG Anhua ZHANG Housong QIN Yongjun LIU Tianqiang WU Tao |
| |
| Abstract: | Based on the systematic sampling from the Neoproterozoic Xiajiang Group in the research area and the data analysis of
major elements and rare earth elements, this study shows that rocks had moderate quantities in SiO2, which its value ranged from 57.54×
10-2 to 88.91×10-2 with an average of 68.32×10-2, low content of CaO (generally smaller than 1%), and high concentration in K2O/Na2O
and Al2O3/TiO2 and low amount of TFe2O3+MgO. The ΣREE of total rare earth element is between 46.51×10-6 and 306.29×10-6 and its
average value was 152.46×10-6. ΣLREE/ΣHREE changed in 8.73~21.6, average value was 12.96, which indicated that it was rich in
LREE, loss in HREE. The δEu in each member of Xiajiang group ranged from 0.7 to 0.8, which was Weak negative anomaly. The REE
patterns were slightly to right. LREE had medium fractionation and HREE was low, which demonstated that the REE patterns was high
gradient in LREE and flat in HREE. Through the geochemistry parameter in each formation, it illustrated that it had similar
geochemistry features between Fanzhao and Qingshui formation, also Pinglue and Longli formation. It further illustrated that similar or
transitional structure background. It drew elementary conclusion that it was back-arc basin of active continental margin in Fanzhao and
Qingping stages, and edge marine sedimentary environment of continental margin in Pinglue and Longli stages. |
| |
| Keywords: | geochemistry tectonic setting Xiajiang Group Neoproterozoic Guizhou Province |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《高校地质学报》浏览原始摘要信息 |
| 点击此处可从《高校地质学报》下载免费的PDF全文 |
|
