Abstract The northern margin of Gondwana in Iran rifted in the Devonian, forming a passive continental margin to the Paleotethys Ocean, the details of which are obscured by later collision. A record of the early phase of opening of Paleotethys is preserved in the 600-m thick Padeha Formation, a Middle Devonian terrestrial rift basin succession. The sandstones are quartz arenite, sub-arkose and arkose and contain minimal detrital matrix (~1%). Bulk-rock geochemistry, according to major elements, suggests a source to the sandstones that was dominated by I-type granite, but also, based on trace elements, included small amounts of intermediate or mafic rocks. Low Zr and HREE contents suggest little or no sandstone in the source area and thus low abundance of fine-grained heavy minerals (

中文翻译：

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冈瓦纳大陆边缘泥盆纪陆相砂岩的成岩历史和物源：伊朗阿尔伯兹东部的帕德哈组

摘要 伊朗冈瓦纳北缘在泥盆纪发生裂谷，形成被动大陆边缘至古特提斯洋，其细节被后来的碰撞所掩盖。在 600 米厚的 Padeha 组中保存了古特提斯早期开放的记录，这是一个中泥盆世陆相裂谷盆地序列。砂岩是石英砂岩、亚长石和长石，含有最少的碎屑基质 (~1%)。根据主要元素，大块岩石地球化学表明砂岩的来源以 I 型花岗岩为主，但也包括基于微量元素的少量中间或基性岩。低 Zr 和 HREE 含量表明源区砂岩很少或没有，因此细粒重矿物丰度低（