• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geodinamica Acta >Diverse tectonic settings of formation of the metaigneous rocks in the Jurassic metamorphic accretionary complexes (Refahiye, NE Turkey) and their geodynamic implications
【24h】

Diverse tectonic settings of formation of the metaigneous rocks in the Jurassic metamorphic accretionary complexes (Refahiye, NE Turkey) and their geodynamic implications

机译：侏罗纪变质增生复合体（Refahiye，NE土耳其）中的亚火成岩形成的不同构造环境及其地球动力学意义

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

Two isolated metamorphic accretionary complexes of Jurassic age,the Refahiye and Kurtlutepe metamorphic rocks, crop out as tectonic slices within the coeval suprasubduction-zone ophiolite at the southern margin of the Eastern Pontides (NE Turkey), close to the izmir-Ankara-Erzincan suture. The Refahiye metamorphic rocks are made up of greenschist, marble, serpentinite, phyllite and minor garnet amphibolite, garnet micaschist and metachert. The whole unit was metamorphosed under garnet-amphibolite-facies conditions and strongly retrogressed during exhumation. The Kurtlutepe metamorphic rocks consist of subgreenschist-facies metavolcanics, metavolcaniclastics, marble, calc-phyllite, and minor serpentinite and metachert. Metabasites in the Refahiye metamorphic rocks are represented by four distinct geochemical affinities: (i) cumulate "flavor," (ii) alkaline oceanic island basalt (OIB),(iii) enriched mid-ocean ridge basalt (E-MORB) and (iv) tholeiitic island arc basalt (IAB). On the other hand, the Kurtlutepe metavolcanic rocks display only tholeiitic to calc-alkaline island arc geochemical affinities. The metabasic rocks with OIB affinities were interpreted as parts of the accreted oceanic islands, and those with E-MORB affinities as parts of accreted ridge segments close to oceanic islands and/or plume-distal mid-ocean ridges with a mantle previously metasomatized by plume components. The metabasic rocks with IAB affinities might have been derived from the overlying suprasubduction ophiolite and/or arc domain by a number of tectonic or sedimentary processes including tectonic slicing of accretionary complex and overlying fore-arc ophiolite,juxtaposition of the magmatic arc with subduction zone by strike slip faults, submarine gravity sliding and debris flows or subduction erosion. However, totally recrystallized nature of the metabasic rocks together with field relations does not allow any inference on the processes involved. The Kurtlutepe metavolcanic rocks might represent collided and accreted oceanic island arc with the subduction zone. Attempted subduction of an intraoceanic island arc may also explain the magmatic lull during Late Jurassic-Early Cretaceous in the Eastern Pontides.
机译：侏罗纪时代的两个孤立的变质增生复合物Refahiye和Kurtlutepe变质岩，在东蓬蒂德斯（NE土耳其）南部边缘的俯冲俯冲带蛇绿岩中作为构造层切出，靠近伊兹密尔-安卡拉-埃尔津坎缝合线。 Refahiye变质岩由绿片岩，大理石，蛇纹石，斜晶石和少量石榴石角闪石，石榴石云母和变质岩组成。整个单位在石榴石-闪石相的条件下变质，在发掘期间强烈倒退。 Kurtlutepe变质岩由亚绿片岩相的超火山岩，超火山碎屑岩，大理石，方解石，次要蛇纹岩和变长石组成。 Refahiye变质岩中的变质岩表现为四种不同的地球化学亲和力：（i）累积的“风味”，（ii）碱性海洋岛玄武岩（OIB），（iii）富集的中洋脊玄武岩（E-MORB）和（iv ）孔雀岛弧形玄武岩（IAB）。另一方面，Kurtlutepe的火山岩仅表现为钙碱性碱性弧向地球化学亲和力。具有OIB亲和力的准生代岩石被解释为增生的海洋岛屿的一部分，具有E-MORB亲和力的那些被解释为靠近海洋岛屿和/或羽状远洋中脊的增生脊段的一部分，先前已被羽化成幔。组件。具有IAB亲和力的准生岩可能是通过许多构造或沉积过程从上俯冲的蛇绿岩和/或弧域中衍生出来的，包括增生复合体的构造切片和叠前的蛇绿岩，以及俯冲带与岩浆弧并置的俯冲带。滑移断层，海底重力滑动和泥石流或俯冲侵蚀。但是，次生岩石的完全重结晶性质以及场关系不允许对所涉及的过程进行任何推断。 Kurtlutepe的火山岩可能代表着俯冲带碰撞和增生的海洋岛弧。尝试俯冲洋内岛弧也可能解释了东庞特德晚侏罗世-早白垩纪的岩浆平静。

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