Kinematic Linkages Among Extrusion, Fold-thrust Shortening, and Foreland Basin Evolution During Early Continental Collision, Zagros Mountains, Iran

这项研究的主要研究人员正在进行一项为期三年的研究，研究扎格罗斯褶皱冲断带和邻近的高扎格罗斯的地质历史。目的是确定(1)在阿拉伯构造板块与欧亚板块会合的变形过程中，发生地震的地壳尺度的右旋断层（近期主断层）和(2)薄皮褶皱逆冲带的相对作用和相互作用。正在进行的研究表明，与先前的研究相反，这两个结构元素可能形成一个运动学联系系统，并在过去大约1000万至2000万年的板块碰撞期间同时活跃。欧亚-阿拉伯大陆碰撞是世界上最年轻的碰撞，它提供了研究早期构造过程的机会，这些构造过程在阿尔卑斯山脉、喜马拉雅山脉和阿巴拉契亚山脉等较老的碰撞山带中强烈叠加。扎格罗斯地区广泛的前陆-盆地沉积中存在着褶皱-逆冲变形的时间记录，包括横切构造、重叠应变标志以及与断裂和褶皱同步沉积的沉积物。该项目采用地层学和构造分析，包括重要的新现场数据收集，同位素年龄测定以确定关键岩石单元的低温热史，以及应用磁法测定沉积地层的年龄。对伊朗Zagros体系的研究，通过描述早期碰撞过程中的变形、沉积、侵蚀和岩浆事件序列，并为其发展速度提供强有力的时间约束，提高了对早期大陆-大陆碰撞过程的认识。这项研究还解决了一个普遍的问题，即如何从更进化和更复杂的碰撞山带的地质记录中确定大陆碰撞的开始年龄。

The principal investigators of this study are conducting a three-year study of the geologic history of the Zagros fold-thrust belt and adjacent High Zagros. The goal is to determine the relative roles and interactions of (1) a seismogenic, crustal-scale, dextral fault (the Main Recent Fault) and (2) the thin-skinned fold-thrust belt during deformation related to the Arabian tectonic plate converging with the Eurasian plate. Ongoing research suggests, contrary to previous studies, that these two structural elements may form a kinematically linked system and were active contemporaneously for a significant period of time during the plate collision over the last approximately 10-20 million years.The Eurasian-Arabian continental collision is the world's youngest and provides opportunities to study early structural processes that are strongly overprinted in older collisional mountain belts such as the Alps, Himalaya, and Appalachians. A temporal record of fold-thrust deformation resides within the extensive, superbly exposed foreland-basin deposits of the Zagros, including crosscutting structures, overlapping strain markers, and sediments deposited synchronously with faulting and folding. The project employs stratigraphic and structural analysis, and includes significant new field data collection, isotopic age dating to determine the low-temperature thermal history of key rock units, and magnetic methods applied to dating sedimentary strata.This research on the Zagros system of Iran is improving understanding of tectonic processes in early continent-continent collision by characterizing the sequence of deformational, depositional, erosional, and magmatic episodes during early collision and providing strong timing constraints on their rates of development. The study is also addressing the general question of how the age of onset of continental collision is determined from the geologic record of more evolved and more complex collisional mountain belts.