登录 | 注册 | 中文  | English  | 用时: 0.52s
元数据
高级检索
首页 > 中国极地考察知识库 > 成果信息库 > 已审查 东南极新元古代晚期–早古生代(泛非期)花岗岩类的对比研究

东南极新元古代晚期–早古生代(泛非期)花岗岩类的对比研究

【标题】东南极新元古代晚期–早古生代(泛非期)花岗岩类的对比研究

【Title】A REVIEW OF RESEARCH ON LATE NEOPROTEROZOIC EARLY PALEOZOIC(PAN-AFRICAN)GRANITOIDS FROM EAST ANTARCTICA

【作者】 李淼; 刘晓春; 赵越

【Author】

【期刊】极地研究

【Journal】

【期刊年份】2010

【卷】Vol. 22

【期】

【关键词】 花岗岩类

【Keywords】 Granitoids

【摘要】东南极内部发育毛德和普里兹两条新元古代晚期-早古生代(泛非期)造山带,这两条造山带中均发育大量同-后构造花岗岩类。本文系统总结了以往东南极泛非期花岗岩类的岩石学、地球化学和年代学方面的研究成果,对不同地区岩体的岩石类型、岩浆源区及形成的构造环境进行了对比研究。结果表明:除南龙达讷山为I型花岗岩外,大部分花岗岩类表现出与碰撞造山作用相关的A型(或S型)花岗岩的特征。泛非期岩浆作用与区域高级变质作用的时代吻合(600-500 Ma)。两条造山带中泛非期岩浆作用与碰撞后岩石圈减薄、岩浆底侵以及上地壳的伸展垮塌相联系,均具有碰撞造山带的构造演化特点。所以,冈瓦纳超大陆的形成很可能是通过西冈瓦纳、印度-南极陆块和澳大利亚-南极陆块等三个陆块沿着两条造山带(毛德造山带和普里兹造山带)近于同期发生拼合碰撞的结果。

【Abstract】There exist two Pan-African orogenic belts, i.e. Maud and Prydz belts, in East Antarctica. Numerous syn- to post-tectonic granitoids occur in these two orogenic belts. In this paper we summarized the published petrological, geochemical and geochronological data of Pan-African intrusive rocks from the different areas in East Antarctica. A comparative study on rock types, magma sources and tectonic settings were performed. The results show that most granitoids have an affinity of A- or S-type granites related to collisional orogeny, except for granitoids from the S?r Rondane Mountains being I-type granites. The Pan-African granitoid magmatism occurred between 600 and 500 Ma, largely coeval with regional high-grade metamorphism. Granitoid magmatism in two orogenic belts is probably related to post-collisional lithospheric thinning, magmatic underplating and crustal relaxation, which is expected in a typical collisional tectonic setting. Therefore, The Gondwana supercontinent was probably formed by the final juxtaposition between West Gondwana, Indian-Antarctic and Australian-Antarctic continental blocks along the two sutures (Maud and Prydz belts) during the Pan-African time.

【基金/项目】 东南极普里兹带变沉积岩的地球化学特征及其对前泛非期构造环境的制约 ; 南极埃默里冰架-格罗夫山综合地质调查与研究

【下载】 PDF