内蒙古东部双井子中三叠世同碰撞壳源花岗岩的确定及其对西伯利亚与中朝古板块碰撞时限的约束

李锦轶 高立明 孙桂华 李亚萍 王彦斌. 内蒙古东部双井子中三叠世同碰撞壳源花岗岩的确定及其对西伯利亚与中朝古板块碰撞时限的约束[J]. 岩石学报, 2007, 23(3): 565-582.
引用本文: 李锦轶 高立明 孙桂华 李亚萍 王彦斌. 内蒙古东部双井子中三叠世同碰撞壳源花岗岩的确定及其对西伯利亚与中朝古板块碰撞时限的约束[J]. 岩石学报, 2007, 23(3): 565-582.
Shuangjingzi middle Triassic syn-collisional crust-derived granite in the east Inner Mongolia and its constraint on the timing of collision between Siberian and Sino-Korean paleo-plates.[J]. Acta Petrologica Sinica, 2007, 23(3): 565-582.
Citation: Shuangjingzi middle Triassic syn-collisional crust-derived granite in the east Inner Mongolia and its constraint on the timing of collision between Siberian and Sino-Korean paleo-plates.[J]. Acta Petrologica Sinica, 2007, 23(3): 565-582.

内蒙古东部双井子中三叠世同碰撞壳源花岗岩的确定及其对西伯利亚与中朝古板块碰撞时限的约束

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    国家自然科学重点基金项目(编号 40132020)资助.致谢本项研究期间,得到了赵越研究员的鼓励和多方面的支持;就花岗岩岩石化学研究,与王涛研究员等进行了讨论;就三叠纪沉积环境,与和政军研究员进行了讨论;Nd和Sr同位素分析,杜利林博士给予了帮助;锆石SHRIMP年龄测定,北京离子探针中心提供了方便.我们在此对上述单位和个人,表示衷心地感谢.两位匿名审稿人对本文提出了很好的建设性修改意见,使本文得以完善,我们在此对他们表示特别诚挚的谢意.

Shuangjingzi middle Triassic syn-collisional crust-derived granite in the east Inner Mongolia and its constraint on the timing of collision between Siberian and Sino-Korean paleo-plates.

  • 内蒙古东部西拉木伦河以北双井子花岗岩侵入古生代晚期增生-碰撞杂岩,遭受了中生代强烈韧性构造变形的改造,在岩石学方面以含有白云母为特征,在岩石化学方面表现为富SiO2、Al2O3和碱质,Na2O/K2O比值小于1,A/CNK比值为1.02~1.08,A/NK比值为1.20~1.35,轻稀土元素富集,Eu异常不明显,微量元素中Ti和Sc亏损、特别是Nb和Ta亏损、Th相对富集,^143Nd/^144Nd同位素比值介于0.512229~0.512286,143Nd/144Nd初始比值为0.512068~0.512199,其εNd(t)均为负值,介于-2.71~-5.28,Nd模式年龄介于1000~1300Ma;^87Sr/^86Sr同位素比值介于0.713516~0.722096,^87Sr/^86Sr初始比值为0.705756~0.709187.这些特征揭示出该岩体是壳源的,可能主要来源于古生代增生-碰撞杂岩和相对古老的大陆边缘的重熔.从该岩体采集的两个样品选出的锆石SHRIMP U-Pb年龄分别为229.2±4.1Ma和237.5±2.7Ma,表明该岩体是在三叠纪中期侵位的.结合区域地质资料和前人相关研究成果,推测西伯利亚与中朝古板块之间沿西拉木伦缝合带的碰撞始于二叠纪中期(约270Ma),于三叠纪中期结束;从三叠纪岩浆岩的露头推测,这一碰撞事件形成了从北山向东通过内蒙古南部到吉林中部的近东西走向的巨型山脉;区域上晚三叠世岩浆活动形成于该山脉演化晚期的伸展构造背景,标志着该区地壳演化新阶段的开始.
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