This paper presents organic geochemical evidence pointing to the occurrence of wildfire events at the Triassic–Jurassic boundary in Central Iran. The studied outcrop section (the Kamarmacheh Kuh section) is comprised of the Upper Triassic Nayband Formation which passes conformably into the Lower Jurassic Ab-e-Haji Formation with no sharp boundary. Organic petrographical studies reveal a higher concentration of semi-fusinite macerals and microscopic charcoal at the boundary between studied formations. This observation can be an evidence for widespread wildfire events at the Triassic–Jurassic boundary of the studied area. Following these fires, vast areas of land were exposed for erosion and large volumes of clastic sediments were provided due to increased run-off. This agrees well with previous sedimentological and stratigraphical studies suggesting a major change in the depositional conditions from marine to non-marine at the Triassic–Jurassic boundary of the Tabas Basin. These findings can have important implications about paleo-depositional settings of the studied formations and the nature of the associated organic matter.

本文提供了有机地球化学证据，表明在伊朗中部三叠纪—侏罗纪边界发生了野火事件。研究的露头剖面（卡玛玛切赫剖面）由上三叠纪纳伊邦地层组成，该地层顺带地进入了侏罗纪下阿卜-哈吉地层，没有明显的边界。有机岩相学研究表明，在研究岩层之间的边界处，半纤锌矿石和微观木炭的浓度较高。该观察结果可以证明在研究区域的三叠纪—侏罗纪边界发生了广泛的野火事件。在这些大火之后，大面积的土地被侵蚀，由于径流增加，提供了大量的碎屑沉积物。这与先前的沉积学和地层学研究非常吻合，表明塔巴斯盆地三叠纪—侏罗纪边界的沉积条件从海洋向非海洋发生了重大变化。这些发现可能对所研究地层的古沉积环境和相关有机质的性质具有重要意义。