博格达陆内碰撞造山带挤压—拉张构造转折期的侵入活动
Intrusive activities during compression-extension tectonic conversion in the Bogda intrascontinental orogen
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摘要: 博格达造山带位于准噶尔与吐鲁番-哈密前寒武纪地块之间,是一个早-中石炭世的陆内裂谷带,该裂谷带于中-晚石炭世闭合.岩相学、岩石化学、稀土元素、微量元素和同位素研究表明,该造山带侵入岩以辉绿岩岩床、岩株和岩墙为主,仅有少数中-酸性岩岩株.这些侵入岩的橄榄拉斑玄武质原始岩浆可能来自轻度亏损的地幔源区,并在地壳深部形成过分层岩浆房.辉绿岩和中-酸性岩分别是分层岩浆房的上部和下部层位岩浆先后上侵和演化产物.野外地质关系及上大河沿中-酸性侵入体的298.4±0.76 Ma Rb-Sr等时线年龄,不但表明博格达地区晚于海西期的侵入活动并不重要,还表明该造山带侵入岩的定位紧随博格达裂谷的陆内碰撞,并代表了地球动力学环境由挤压变为拉张这个重大转折时期.
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Key words:
- Granite /
- Diabase /
- Intrusive rocks /
- Continental rift /
- Orogen /
- Bogda
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