| 河南鲁山地区早前寒武纪变质岩系的锆石SHRIMP
U-Pb年龄、地球化学特征及环境演化 |
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| 引用本文： | 杨长秀.河南鲁山地区早前寒武纪变质岩系的锆石SHRIMP
U-Pb年龄、地球化学特征及环境演化[J].地质通报,2008,27(4):517-533. |
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| 作者姓名： | 杨长秀 |
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| 作者单位： | 河南省地质调查院,河南,郑州,450007 |
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| 基金项目： | 中国地质调查局科研项目 |
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| 摘 要： | 河南鲁山地区早前寒武系划分为新太古代荡泽河岩组、TTG系与古元古代太华岩群铁山岭岩组、水底沟岩组、雪花沟岩组.在水底沟岩组石墨矽线片麻岩中获得最年轻的碎屑锆石SHRIMP U-Pb年龄为2.250～2.310Ga,变质锆石年龄为1.84Ga 0.07Ga在侵入于雪花沟岩组的石榴钾长花岗片麻岩中获得岩浆锆石SHRIMP U-Pb年龄为2.146Ga 0.02Ga,变质锆石年龄为1.87Ga±O.01Ga,从而确定太华岩群的形成时代为古元古代.地球化学特征分析表明,荡泽河岩组显示岛弧环境,铁山岭岩组具板内裂谷向浅海演化的特点,水底沟岩组形成于封闭的浅海,雪花沟岩组具初始洋盆的特征.该地区经历了新太古代古陆核俯冲与拼贴.古元古代地壳裂解、扭张成初始洋盆,到地体拼贴、洋盆闭合形成克拉通的漫长演化历程.
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| 关 键 词： | 河南鲁山地区 太华岩群 早前寒武系 锆石SHRIMP U-Pb年龄 地球化学特征 环境演化 河南鲁山 地区 早前寒武纪 变质岩系 岩浆锆石 SHRIMP 锆石年龄 地球 化学特征 环境演化 ages Zircon area series Precambrian Early environmental evolution characteristics 演化历程 克拉通 |
| 文章编号： | 1671-2552(2008)04-0517-17 |
| 修稿时间： | 2007年8月1日 |
Zircon SHRIMP U-Pb ages, geochemical characteristics and environmental evolution of the Early Precambrian metamorphic series in the Lushan area, Henan, China |
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| YANG Chang-xiu.Zircon SHRIMP U-Pb ages, geochemical characteristics and environmental evolution of the Early Precambrian metamorphic series in the Lushan area, Henan, China[J].Geologcal Bulletin OF China,2008,27(4):517-533. |
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| Authors: | YANG Chang-xiu |
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| Abstract: | The Early Precambrian in the Lushan area, Henan, is divided into the Neoarchean Dangzehe Formation-complex and TTG series and the Paleoproterozoic Taihua Group-complex including the Tieshanling, Shuidigou and Xuehuagou formation-complexes. The author obtained the youngest detrital zircon SHRIMP U-Pb ages of 2.250-2.310 Ga and a metamorphic zircon age of 1.84±0.07 Ga for graphite-sillimanite gneiss of the Shuidigou Formation-complex, and a magmatic zircon SHRIMP U-Pb age of 2.146±0.02 Ga and a metamorphic zircon age of 1.87±0.01 Ga for garnet-bearing gneissic granite intruded into the Xuehuagou Formation-complex; thus the age of the Taihua Group-complex can be determined to be Paleoproterozoic. The analysis of the geochemical characteristics indicates that: the Dangzehe Formation-complex indicates an island arc environment; the Tieshanling Formation-complex has the characteristics of evolution from the intraplate rift to shallow sea; the Shuidigou Formation-complex was formed in an enclosed shallow sea; and the Xuehuagou Formation-complex has the features of an initial ocean basin. The area experienced a lengthy evolutionary process from the subduction and amalgamation of paleocontinental nuclei in the Neoarchean through the crustal breakup and extension into an initial ocean basin to the amalgamation of terranes and oceanic basin closing to form a craton during the Paleoproterozoic. |
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