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造山前、造山和造山后花岗岩的识别
引用本文:张旗,王元龙,金惟俊,贾秀勤,李承东.造山前、造山和造山后花岗岩的识别[J].地质通报,2008,27(1):1-18.
作者姓名:张旗  王元龙  金惟俊  贾秀勤  李承东
作者单位:1. 中国科学院地质与地球物理研究所,北京,100029
2. 中国科学院高能物理研究所,北京,100039
3. 中国地质调查局天津地质矿产研究所,天津,300170
基金项目:国家“973”项目(编号:2002CB412601)和国家自然科学基金项目(编号:40672128)资助.致谢:本文在撰写过程中与王二七研究员多次切磋,他的许多见解对笔者很有启发;吴福元研究员对本文的初稿提出了很好的意见;王焰博士详细评点了本文的初稿,与笔者就许多问题作了深入的探讨.在此一并表示衷心的感谢.
摘    要:造山前、造山和造山后(或碰撞前、碰撞和碰撞后)花岗岩是花岗岩研究的热门话题。但是,目前关于造山前、造山和造山后的概念存在模糊和矛盾的认识,为此提出了关于造山前、造山和造山后的概念和新的判别方法,并结合非洲、土耳其和巴西的某些实例进行了讨论。着重讨论了青藏高原与碰撞有关的花岗岩,指出青藏高原只存在造山前和造山2个阶段.不存在造山后阶段。认为青藏高原碰撞的时间大概在55Ma左右.25~3Ma的埃达克岩和淡色花岗岩是碰撞阶段形成的。青藏高原25~3Ma的花岗岩的特征暗示青藏高原在25Ma之前已经整体抬升.25Ma之后发育的伸展构造(藏南拆离系、大规模走滑断裂和南北向裂谷)是在青藏高原挤压的大背景下出现的,属于次级的派生构造,其并不能说明青藏高原已经进入伸展减薄和垮塌的碰撞后阶段。

关 键 词:造山前、造山和造山后阶段  地壳厚度  花岗岩  青藏高原  造山后阶段  淡色花岗岩  识别  recognition  Criteria  碰撞后阶段  垮塌  伸展减薄  派生构造  背景  挤压  南北向裂谷  走滑断裂  大规模  拆离  藏南  伸展构造  发育  整体抬升  特征
文章编号:1671-2552(2008)01-0001-18
收稿时间:2007-09-14
修稿时间:2008-01-04

Criteria for the recognition of pre-, syn-and post-orogenic granitic rocks
ZHANG Qi,WANG Yuan-long,JIN Wei-jun,JIA Xiu-qin,LI Cheng-dong.Criteria for the recognition of pre-, syn-and post-orogenic granitic rocks[J].Geologcal Bulletin OF China,2008,27(1):1-18.
Authors:ZHANG Qi  WANG Yuan-long  JIN Wei-jun  JIA Xiu-qin  LI Cheng-dong
Abstract:Pre-, syn-, and post-orogenic (pre-, syn- and post-collisional) granitic rocks are a hot topic of granite research. However, vague and contradictory views exist about the concepts of pre-, syn-, and post-orogeny. Therefore the authors present a new concept and discrimination method for pre-, syn-, and post-orogeny and discuss some case histories of Africa, Turkey and Brazil. The focus is on granitic rocks of the Qinghai-Tibet Plateau related to collision. They point out that only the pre- and syn-orogenic stages occurred on the Qinghai-Tibet Plateau. The collision on the Qinghai-Tibet Plateau took place at ~50 Ma. The 25-3 Ma adakite and leucogranite formed in the collision stage. The features of the 25-3 Ma granitic rocks imply that the Qinghai-Tibet Plateau had been uplifted wholesalely before 25 Ma, and the extensional tectonics (such as southern detachment system, large-scale strike-slip faults and N-S-striking rift) that developed after 25 Ma formed by compression in the syn-orogenic stage, rather than crustal extensional thinning and collapse in the post-orogenic stage.
Keywords:pre-  syn- and post-orogenic stages  crustal thickness  granite  Qinghai-Tibet Plateau
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