Geochronology of HP/LT rocks and amphibolites from the Hajiabad-Esfandagheh area, Sanandaj-Sirjan Zone, Iran

该提案寻求为实地研究活动提供资金，这些活动旨在为伊朗Sanandaj-Sirjan区Hajiabad-Esfandagheh地区混杂岩中的高压/低温岩石和斜长角闪岩建立坚实的地质年代学基础。现有的地质年代学数据库相对较小，不足以揭示变质记录。为了评估以前报告的Ar-Ar数据的相关性，并获得更详细的图片的变质演化，计划应用多方法的年代学方法（Rb-Sr，Sm-Nd，U-Pb），这将提供改进的年龄限制的细化palinteconstructive重建和深入了解的变质事件与阿拉伯半岛和欧亚大陆之间的收敛。重点是回答以下问题：（1）HP/LT岩石和斜长角闪岩记录的确切年龄是多少？(2)是否存在区域性年龄差异？(3)这些岩石在时间上是否等同于伊朗其他地方（如Makran地区）和/或阿曼暴露的类似矿点？(4)在伊朗西南部板块边缘的大框架内，混杂岩的结构位置是什么？新的数据将被用来制定一个更详细的时间框架的古构造演化，并有可能大大提高的认识的地球动力学演化的扎格罗斯造山带。

This proposal seeks funding for field-based research activities that aim at establishing a solid geochronologic foundation for HP/LT rocks and amphibolites from mélanges of the Hajiabad- Esfandagheh area, Sanandaj-Sirjan Zone, Iran. The available geochronological database is relatively small and insufficient to unravel the metamorphic record. In order to evaluate the relevance of previously reported Ar-Ar data and to obtain a more detailed picture of the metamorphic evolution, it is planned to apply a multimethod geochronological approach (Rb-Sr, Sm-Nd, U-Pb) that will provide improved age constraints for refinement of palintectonic reconstructions and in-depth understanding of the metamorphic events associated with convergence between Arabia and Eurasia. Emphasis will be placed on answering the following questions: (1) What are the exact ages recorded by the HP/LT rocks and the amphibolites? (2) Are there any regional age variations? (3) Are these rocks time-equivalent to similar occurrences exposed elsewhere in Iran (e.g. the Makran area) and/or Oman? (4) What is the structural position of the mélanges within the larger frame of the SW Iranian plate margin? The new data will be used to develop a more detailed temporal framework of the paleotectonic evolution and has the potential to advance significantly the understanding of the geodynamic evolution of the Zagros orogen.