| 东昆仑小庙基性岩脉地球化学及LA-ICP-MS锆石U-Pb定年 |
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| 引用本文： | 任军虎,柳益群,周鼎武,冯乔,张琨,董忠良,秦萍莉.东昆仑小庙基性岩脉地球化学及LA-ICP-MS锆石U-Pb定年[J].吉林大学学报(地球科学版),2010,40(4):859-868. |
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| 作者姓名： | 任军虎 柳益群 周鼎武 冯乔 张琨 董忠良 秦萍莉 |
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| 作者单位： | 1.西北大学 地质学系/大陆动力学国家重点实验室,西安 710069;
2.山东科技大学 地质科学与工程学院,山东 青岛 266510;
3.大庆油田有限责任公司 勘探开发研究院,黑龙江 大庆 163712;
4.陕西省地矿局 区域地质矿产研究院,陕西 咸阳;712000 |
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| 基金项目： | 中国石油化工股份有限公司重大项目 |
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| 摘 要： | 东昆仑小庙辉绿岩脉侵位于前寒武纪金水口群变质基底中，岩石地球化学研究表明:它是以低TiO2和较低的MgO，Nb、Ta亏损和Th富集为特征，贫P2O5，Na2O＞K2O, 富集大离子亲石元素Rb、Ba、Th、U、Sr和LREE，高场强元素分异明显，地壳源区对辉绿岩的影响很大，形成于大陆拉张带或裂谷初期环境。LA-ICP-MS锆石U-Pb同位素定年结果表明:1 996~2 428 Ma年龄可能代表岩浆捕获锆石年龄，形成于太古宙至古元古代的区域性构造热事件；3个较一致点的加权平均年龄（733.6±6.6） Ma（MSWD =0.038）为辉绿岩结晶年龄，可能代表了新元古代东昆仑地区裂解的时间，这与Rodinia超大陆裂解相对应。
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| 关 键 词： | 地球化学 LA-ICP-MS锆石U-Pb定年 基性岩脉 构造环境 小庙 东昆仑 |
| 收稿时间： | 2009-10-07 |
Geochemical Characteristics and LA-ICP-MS Zircon U-Pb Dating of Basic Dykes in the Xiaomiao Area,Eastern Kunlun |
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| REN Jun-hu,LIU Yi-qun,ZHOU Ding-wu,FENG Qiao,ZHANG Kun,DONG Zhong-liang,QIN Ping-li.Geochemical Characteristics and LA-ICP-MS Zircon U-Pb Dating of Basic Dykes in the Xiaomiao Area,Eastern Kunlun[J].Journal of Jilin Unviersity:Earth Science Edition,2010,40(4):859-868. |
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| Authors: | REN Jun-hu LIU Yi-qun ZHOU Ding-wu FENG Qiao ZHANG Kun DONG Zhong-liang QIN Ping-li |
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| Abstract: | The basic dykes in Xiaomiao area of Eastern Kunlun intrude into Jinshuikou group. Their geochemistry is characterized by low contents of TiO2, MgO, P2O5 and Na2O＞K2O，meanwhile, they have high contents rare earth elements and enriched in light rare earth elements. Comparing with the primitive mantle, they are distinctly enriched in the large-iron-lithophile elements(such as Rb, Ba, Th, U and Sr) and Th and depletion of high-field-strength element(such as Nb and Ta). Geochemical features of basic dykes indicate that the magma was influenced by the crustal source and related to continental extensional zone (incipient rift). LA-ICP-MS zircon U-Pb dating indicates that the age of (1996-2428)Ma represent the ages of captured zircon，which formed in regional tectonic thermal event during Archean to Palaeoproterozoic period. The age of (733.6±6.6) Ma (MSWD=0.038) may be the crystallized age of the basic dykes, which can be listed as the age of the Rodinia continent spliting. The basic dykes formed in continental rift environment of the Eastern Kunlun. |
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| Keywords: | geochemistry LA-ICP-MS ziron U-Pb dating basic dykes tectonic setting Xiaomiao area eastern Kunlun |
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