Exhumation of Ultrahigh-Pressure Rocks in the Scandinavian Caledonides

有证据表明，大型陆块已经俯冲到超过100公里的深度，这对目前的地球动力学和地球化学范式构成了挑战，对造山带超高压岩石折返的理解也不是很好。该项目将研究斯堪的纳维亚加里多尼德地区的超高压岩石，其中后续的构造叠加没有掩盖高压历史，将通过建立关键逆冲推覆及其边界断层的压力-温度-变形-时间历史来评价现有和新的构造模式。结合其他超高压实例的数据，这项工作的结果有望有助于阐明俯冲地球动力学背景下的大陆地壳深度俯冲及其返回地表的现象。

9814889Hacker Evidence that large continental blocks have been subducted to depths in excess of 100 km, poses a challenge to present geodynamic and geochemical paradigms, and understanding the exhumation of ultrahigh pressure rocks in orogenic belts is also not well understood. This project will examine ultrahigh pressure rocks in the Scandanavian Caledonides where subsequent tectonic overprints have not obscured the high pressure history, existing and new tectonic models will be evaluated by constructing pressure-temperature-deformation-time histories of key thrust nappes and their bounding faults. In combination with data from other ultrahigh pressure examples, results of this work are expected to help clarify the phenomena of deeply subducted continental crust and its return to the surface in the context of subduction geodynamics.***