...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >The granite pluton of Zahedan (SE Iran): a petrological and magnetic fabric study of a syntectonic sill emplaced in a transtensional setting
【24h】

The granite pluton of Zahedan (SE Iran): a petrological and magnetic fabric study of a syntectonic sill emplaced in a transtensional setting

机译：Zahedan（伊朗东南部）的花岗岩岩体：岩石和磁性织物研究了在张拉作用下放置的一个构造门槛

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

The ～ 32 Ma, NW-SE elongate, 75 km-long granite pluton of Zahedan is one of the most conspicuous geological features of southeast Iran. It is composed of metaluminous to weakly peraluminous rocks, corresponding to magnetite- and ilmenite-bearing I-type granitoids, ranging from diorites to granites. All rocks, including the late andesitic to dacitic dykes, belong to the high-K calk-alkaline series. Field and structural relationships, as well as evidence for mixing-mingling, can be used to unravel the magmatic history of the different rock types. Microstructural examinations and magnetic fabric measurements were performed on a collection of oriented specimens from the northern part of the pluton. Ubiquitous flat-lying foliations argue in favour of a sill-like body, except for the diorite. The biotite-bearing granitic fades, at the pluton's periphery, was the first batch of magma which initiated the sill. This sill probably behaved as a N-S-directed decollement zone, marked by conspicuous 'magmatic-cataclastic' microstructures and N-S treading lineations. The intrusion of the hornblende-bearing granodiorite, with typical magmatic structures, inflated the sill. Deformation occurred at the same time, with E-W to NW-SE stretching, marked by lineations. The main dioritic stock forming the floor of the sill is considered to be a remnant of the feeder-zone. An abundant dyke swarm marks the end of the syntectonic emplacement of the Zahedan sill. A three-dimentional model of emplacement is proposed in the context of the latest episodes in the closure of the Neo-Tethys during which the Lut Block ended its northward migration with respect to the Afghan blocks.
机译：Zahedan的〜32 Ma，NW-SE细长，75 km长的花岗岩岩体是伊朗东南部最明显的地质特征之一。它由含金属的至弱含铝的岩石组成，对应于含磁铁矿和钛铁矿的I型花岗岩，从闪长岩到花岗岩。所有岩石，包括晚安山岩到大溪岩脉，都属于高K的Calk-碱性系列。场和结构的关系，以及混合混合的证据，可以用来揭示不同岩石类型的岩浆历史。进行了微结构检查和磁性织物的测量，这些样品来自岩体北部的定向标本。无处不在的平坦的叶子争辩说，除了闪长岩之外，人们都喜欢一种基石状的身体。在岩体外围的含黑云母的花岗岩褪色是引发该岩浆的第一批岩浆。该窗台可能表现为N-S导向的弯折带，其特征是明显的“岩浆-碎屑”微结构和N-S踏纹。带有角闪石的花岗闪长岩的侵入，具有典型的岩浆构造，使门槛膨胀。变形同时发生，从E-W到NW-SE拉伸，并以线条标记。形成窗台底部的主要异生动物种群被认为是馈线区的残余物。大量的堤防标志着Zahedan窗台的句柄构造结束。在新特提斯封闭的最新情节中，提出了一个三维度的安置模型，在此期间，卢特街区结束了其相对于阿富汗街区的北移。

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