• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of South American earth sciences >Neoproterozoic granites of the Lajeado intrusive suite, north-center Brazil: A late Ediacaran remelting of a Paleoproterozoic crust
【24h】

Neoproterozoic granites of the Lajeado intrusive suite, north-center Brazil: A late Ediacaran remelting of a Paleoproterozoic crust

机译：巴西中北部Lajeado侵入套件的新元古代花岗岩：古元古代地壳的Ediacaran晚期重熔

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In north-central Brazil, a number of granite plutons, which intrude Paleoproterozoic gneiss-granulite terrains of the Goias Massif, crop out along a thermal axis parallel to the Transbrasiliano Lineament. Single zircon lead evaporation ages from three granitic bodies span between 552 and 545 Ma. Sm-Nd model ages (T_(DM)) vary between 2.1 and 1.7 Ga and negative eNd(o,55 Ga) values between -10 and -13 show that Paleoproterozoic crust was involved in the genesis of these granites. These plutons, which form the Lajeado Intrusive Suite are part of an important Ediacaran magmatic event in central-northern of the Tocantins Tectonic Province, composed of metaluminous to slightly peraluminous granites with geochemical characteristics similar to A-type granites, whose crystallization occurred under low water activity during magmatic emplacement. The granitic intrusive bodies are related to a crustal extensional/ transtensional tectonic event at the end of the Neoproterozoic. They may have connection with the granitic plutons of similar age (0.56-0.52 Ga) in northwestern Ceara state, on the other side of the Paleozoic Parnaiba Basin in northwest of Borborema Province, along the Transbrasiliano Lineament.
机译：在巴西中北部，许多花岗岩岩体沿着平行于Transbrasiliano Lineament的热轴切入，侵入了Goias Massif的古元古代片麻岩-粒岩地形。三个花岗岩体的单一锆石铅蒸发年龄介于552和545 Ma之间。 Sm-Nd模型年龄（T_（DM））在2.1和1.7 Ga之间变化，eNd（o，55 Ga）负值在-10和-13之间变化，表明古元古代地壳参与了这些花岗岩的成因。这些构成Lajeado侵入套件的岩体是Tocantins构造省中北部重要的Ediacaran岩浆事件的一部分，该岩浆由金属化至轻度铝化的花岗岩组成，其地球化学特征类似于A型花岗岩，其结晶发生在低水位岩浆安置期间的活动。花岗岩侵入体与新元古代末期的地壳伸展/跨张构造事件有关。它们可能与西北部塞阿拉州（Cera state）类似年龄（0.56-0.52 Ga）的花岗岩体有联系，该岩体位于Transborsilianoiano Lineament沿Borborema省西北部的古生代Parnaiba盆地的另一侧。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号