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中国东北花岗岩-吴福元的总结和封笔之作

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发表于 2011-10-23 17:12:15 | 显示全部楼层 |阅读模式
Northeast (NE) China is characterized by immense volumes of granitic rocks, exposed over an area of ~200,000 km2. Although the precise geochronological ramework was not clear, although it was considered that most of them were emplaced during the Paleozoic, when numerous tectonic blocks amalgamated. Over the past decade, we have selected 370 samples for zircon U–Pb dating in order to constrain the spatial and temporal distribution of grantoids in the area. These data, combined with 63 ages obtained by other researchers, indicate that Paleozoic grantoids are not as widely distributed in the area as previously thought. In the eastern part of the area, grantoids in the Zhangguangcai Range were mostly emplaced during the Jurassic (150–190 Ma) with a little amounts in the Paleozoic, whereas grantoids in the Nadanhada terrane, the easternmost part of NE China, have emplacement age of ~115 Ma. In the west, grantoids exposed in the Great Xing’an Range were mainly formed during the Early Cretaceous (120–135 Ma) with some in the Paleozoic, and those in the Erguna Massif, the westernmost part of NE China, were emplaced during the Jurassic (160–190 Ma). Based on the temporal-spatial distribution of these granitic rocks, it is suggested that the Paleozoic grantoids were formed during various stages from oceanic subduction to block amalgamation in the Central Asian Orogenic Belt (CAOB). It is proposed that the Jurassic grantoids in the Zhangguangcai Range were probably related to Paleo-Pacific plate subduction west of the Jiamusi Massif (block). This subduction resulted in regional lithospheric thickening, and subsequent delamination of the thickened lithosphere due to its gravity instability in the Early Cretaceous. Unlike other areas in the Central Asian Orogenic Belt, NE China was significantly affected by subduction of the Paleo-Pacific ocean, and can be considered as one of the most important areas of the eastern Asian active continental margin during the Mesozoic.


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发表于 2011-10-23 21:26:49 | 显示全部楼层
啊,,吴哥
发表于 2011-10-24 13:18:53 | 显示全部楼层

回帖奖励 +1 个铜币

封闭之作,什么情况?
“中奖概率50%” 我得试试人品
发表于 2011-10-24 21:27:15 | 显示全部楼层
试手气,另外吴福元老师的这篇文章很棒的说!

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发表于 2011-10-25 12:19:51 | 显示全部楼层
这篇文章很棒
发表于 2011-11-3 09:16:29 | 显示全部楼层
本帖最后由 Anorthosite 于 2011-11-3 09:17 编辑

求解“封闭之作”~~~~~~~~~~~
发表于 2011-11-3 09:23:08 | 显示全部楼层
Anorthosite 发表于 2011-11-3 09:16
求解“封闭之作”~~~~~~~~~~~

据说,这篇文章是吴福元老师对东北地区研究情况的一个总结。以后主要研究重心转到别处了。
发表于 2011-11-10 10:39:01 | 显示全部楼层
封闭之作,什么情况?
发表于 2011-11-15 11:38:44 | 显示全部楼层
下载,看看先!
发表于 2011-12-9 19:51:33 | 显示全部楼层
拜读一下  中国东北花岗岩-吴福元的总结和封笔之作
发表于 2011-12-15 18:27:01 | 显示全部楼层

回帖奖励 +1 个铜币

Thank you for sharing
发表于 2012-2-6 14:26:52 | 显示全部楼层

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不错,内容很丰富,好好学习下
发表于 2012-2-6 14:27:02 | 显示全部楼层
不错,内容很丰富,好好学习下
发表于 2012-11-17 19:17:45 | 显示全部楼层

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顶。。。。。。。。。。
发表于 2013-2-25 10:20:14 | 显示全部楼层
感谢楼主分享 好东西 收藏了
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