| 大兴安岭火山喷发带北段中性、中酸性火山岩地球化学特征及其地质意义 |
| |
| 引用本文： | 赵书跃,韩彦东,朱春燕,郭奎城,王建民,刘宝山.大兴安岭火山喷发带北段中性、中酸性火山岩地球化学特征及其地质意义[J].地质力学学报,2004,10(3):276-287. |
| |
| 作者姓名： | 赵书跃 韩彦东 朱春燕 郭奎城 王建民 刘宝山 |
| |
| 作者单位： | 黑龙江省地质调查总院齐齐哈尔分院,黑龙江,齐齐哈尔,161005 |
| |
| 摘 要： | 通过对大兴安岭北段晚侏罗世吉祥峰组中酸性火山岩的岩石地球化学研究,发现其中存在高Sr低Y型火山岩,即文献上所称的埃达克质岩,笔者认为中酸性火山岩的岩浆起源于下地壳玄武质岩浆,为玄武质岩浆底辟上侵引起地热梯度增加、下地壳中 基性变质火成岩石部分熔融的之混合岩浆,是古太平洋板块向西伯利亚板块斜向俯冲过程中,蒙古 鄂霍次克海槽封闭,陆壳碰撞使地壳加厚,形成兴蒙造山带时所引起的一系列构造岩浆活动。其形成时的构造环境应是在滨太平洋构造域背景下受古亚洲构造域的影响和限制,并非是滨太平洋构造活动带的单一活动所致。早白垩世上库力组酸性火山岩属陆壳重熔型(S型)火山岩,其形成可能与印度 澳大利亚板块朝北偏东方向推挤运移、中国东部岩石圈拉张引起的下地壳拆沉作用有关。
|
| 关 键 词： | 高Sr低Y型火山岩 下地壳 吉祥峰组 上库力组 大兴安岭北段 |
| 文章编号： | 1006-6616(2004)03-0276-12 |
| 收稿时间： | 2002/10/14 0:00:00 |
| 修稿时间： | 2002年10月14 |
GEOCHEMICAL CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF INTERMEDIATE AND INTERMEDIATE-ACID VOLCANIC ROCKS IN THE NORTHERN SECTOR OF THE DA HINGGAN VOLCANIC ERUPTION ZONE |
| |
| ZHAO Shu-yue,HAN Yan-dong,ZHU Chun-yan,GHO Kui-cheng,WANG Jian-min and LIU Bao-shan.GEOCHEMICAL CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF INTERMEDIATE AND INTERMEDIATE-ACID VOLCANIC ROCKS IN THE NORTHERN SECTOR OF THE DA HINGGAN VOLCANIC ERUPTION ZONE[J].Journal of Geomechanics,2004,10(3):276-287. |
| |
| Authors: | ZHAO Shu-yue HAN Yan-dong ZHU Chun-yan GHO Kui-cheng WANG Jian-min and LIU Bao-shan |
| |
| Institution: | Qiqihar Branch, Heilongjiang Institute of Geological Survey, Qiqihar 161005, Heilongjiang, China,Qiqihar Branch, Heilongjiang Institute of Geological Survey, Qiqihar 161005, Heilongjiang, China,Qiqihar Branch, Heilongjiang Institute of Geological Survey, Qiqihar 161005, Heilongjiang, China,Qiqihar Branch, Heilongjiang Institute of Geological Survey, Qiqihar 161005, Heilongjiang, China,Qiqihar Branch, Heilongjiang Institute of Geological Survey, Qiqihar 161005, Heilongjiang, China and Qiqihar Branch, Heilongjiang Institute of Geological Survey, Qiqihar 161005, Heilongjiang, China |
| |
| Abstract: | Petrological and geochemical studies of intermediate-acid volcanic rocks of the Late Jurassic Jixiangfeng Formation in the northern sector of the Da Hinggan Mountains show that there exist high-Sr and low-Y type volcanic rocks in the area,which are so-called adakitic rocks in the literature.The authors think that the magmas of the intermediate-acid volcanic rocks were derived from basaltic magmas of the lower crust and are mixed magmas produced by the increase of geothermal gradients due to diapiric injection of basaltic magmas and partial melting of intermediate-basic metamorphic igneous rocks in the lower crust,and that they resulted from a series of tectonomagmatic activities that took place when the closing of the Mongolian-Okhotsk sea trough and continent-continent collision caused crustal thickening and brought about the formation of the Hinggan-Mongolian orogenic belt in the process of oblique subduction of the Paleo-Pacific plate beneath the Siberian plate.The tectonic setting in which they formed was affected and constrained by the Paleo-Asiatic tectonic domain in the setting of the peri-Pacific domain,rather than only resulted from the activity of the peri-Pacific tectonic mobile belt.The acid volcanic rocks of the Early Cretaceous Shangkuli Formation belong to continental crust anatexis type ones (S-type volcanic rocks) and may have formed by compression and migration of the Indian-Australia plate toward the NNE and delamination of the lower crust caused by the lithospheric extension in eastern China. |
| |
| Keywords: | high-Sr low-Y type volcanic rocks lower crust Jixiangfeng Formation Shangkuli Formation northern sector of the Da Hinggan Mountains |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《地质力学学报》浏览原始摘要信息 |
| 点击此处可从《地质力学学报》下载免费的PDF全文 |
|
