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| 准噶尔盆地石炭纪火山岩岩石地球化学特征及其构造环境意义 | |
| 引用本文： | 毛治国,邹才能,朱如凯,郭宏莉,王君,唐勇,祁利琪,张志更.准噶尔盆地石炭纪火山岩岩石地球化学特征及其构造环境意义[J].岩石学报,2010,26(1):207-216. |
| 作者姓名： | 毛治国 邹才能 朱如凯 郭宏莉 王君 唐勇 祁利琪 张志更 |
| 作者单位： | 1. 中国石油勘探开发研究院,北京,100083;提高石油采收率国家重点实验室(中国石油勘探开发研究院)北京,100083 2. 新疆油田公司勘探开发研究院,克拉玛依,834000 3. 吐哈油田分公司勘探开发研究院,哈密,839009 |
| 基金项目： | 国家重点基础研究发展计划(2009CB219304)和国家科技重大专项(2008ZX05000-001-02)联合资助 |
| 摘 要： | 准噶尔盆地石炭纪发育区域性的火山岩建造,火山岩岩性以中基性为主,主要为玄武岩、玄武安山岩,同时发育少量酸性的流纹岩,基本属于钙碱性系列。样品全碱(Na_2O+K_2O=2.99%～8.07%)和TiO_2(0.30%～2.57%)含量较高,K_2O含量(0.13%～3.29%)较低,稀土元素含量(∑REE)中等。球粒标准化的REE配分表现轻稀土元素(LREE)相对于重稀土元素(HREE)富集((La/Yb)_N=2.47～7.45)、轻重稀土分异的特征,部分样品的Eu和大部分样品的Ce显示轻微的负异常(δEu=0.543～1.088,δCe=0.787～0.987)。微量元素具有大离子亲石元素(LILE)富集及高场强元素Nb、Ta亏损的特征,大部分样品(Rb/Yb)_N均远大于1。这些特征结合元素相关环境判别图解表明,准噶尔盆地石炭纪火山岩是原始岩浆经历了一定程度分异作用后的产物,以板内大陆环境为主,兼具有部分岛弧特征,形成于俯冲碰撞造山期后伸展背景下,火山岩所具有的岛弧特征是碰撞前混染弧组分的继承。 |
| 关 键 词： | 准噶尔盆地 石炭系 火山岩 地球化学 构造环境 |
| 收稿时间： | 2009/11/4 0:00:00 |
| 修稿时间： | 2009/11/17 0:00:00 |
Geochemical characteristics and tectonic settings of Carboniferous volcanic rocks in Junggar basin |
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| Mao ZG,Zou CN,Zhu RK,Guo HL,Wang J,Tang Y,Qi LQ and Zhang ZG.Geochemical characteristics and tectonic settings of Carboniferous volcanic rocks in Junggar basin[J].Acta Petrologica Sinica,2010,26(1):207-216. | |
| Authors: | Mao ZG Zou CN Zhu RK Guo HL Wang J Tang Y Qi LQ and Zhang ZG |
| Institution: | Research Institute Petroleum Exploration & Development, PetroChina, Beijing 100083, China;Research Institute Petroleum Exploration & Development, PetroChina, Beijing 100083, China;Research Institute Petroleum Exploration & Development, PetroChina, Beijing 100083, China;Research Institute Petroleum Exploration & Development, PetroChina, Beijing 100083, China;Research Institute Petroleum Exploration & Development, PetroChina, Beijing 100083, China;Research Institute Exploration & Development, Xinjiang Oil-field Company, Karamay 834000, China;Research Institute Exploration & Development, Xinjiang Oil-field Company, Karamay 834000, China;Exploration & Development Research Institute, Tuha Oil-field Company, Hami 839009, China |
| Abstract: | Territorial volcanic formation develop in Carboniferous period in Junggar basin. The volcanic rocks mainly composed of intermediate-basic basalts and basaltic andesites, including a few acidic rhyolites. They belong to calc-alkalic series. Volcanic rock samples have relatively high alkali ( Na_2O + K_2O =2.99%～8.07% ), TiO_2 (0.30%～2.57% ) contents, medium rare earth element contents and relatively low K_2O (0.13%～3.29% ) contents. Chondrite normalized REE patterns shows the characteristic of LREE enrichment ((La/Yb)_N=2.47～7.45) and differentiation, with weak Eu anomalies (δEu=0.543～1.088) and Ce anomalies (δCe =0.787～0.987). These samples are enriched in LILE but relatively depleted in HFSE (Nb, Ta), and have high (Rb/Yb) (>1). These characteristics, along with element correlation diagram, indicate that the Carboniferous volcanic rocks in Junggar basin are certain differential production of primitive magma, mainly generated in intra-plate continental setting, with island are environments partially. These volcanic rocks are from extensional setting of post-collisional period. Their island-arc characteristics are inherited from pre- collisional are component. |
| Keywords: | Junggar basin Carboniferous Volcanic rocks Geochemistry Tectonic settings |
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