Crustal Reflection Profiling in Contrasting Archean Terrainsin Minnesota: The Oldest Crust in the U.S.

地球科学家面临的最大挑战之一是破译太古代地壳的性质和起源，太古代地壳被认为是在最大的地壳形成时期形成的。关于早期地壳成因的一些主要问题涉及地壳厚度，水平与垂直构造制度和演化（即底板），地壳增生和莫霍性质。明尼苏达州的COCORP资料及其再分析为太古宙的地下构造提供了重要的新信息。该项目涉及一系列地震反射实验，旨在回答有关太古宙地壳演化和莫霍性质的一些基本问题。这些实验是基于一个创新的记录程序，包括多源p波和s波记录和200-400个接收器，本着pascal的精神，使用pascal和主要研究人员自己的记录系统。

One of the greatest challenges facing earth scientists is to decipher the nature and origin of Archean crust, believed to have formed during the greatest crustal-forming episode. Some of the major questions regarding early crustal genesis involve crustal thickness, horizontal vs vertical tectonic regimes and evolution (i.e., underplating), crustal accretion and the nature of the Moho. COCORP data from Minnesota and its reanalysis have provided important new information on the subsurface structure of the Archean. This project involves a series of seismic reflection experiments designed to answer some of the fundamental questions raised about Archean crustal evolution and the nature of the Moho. These experiments are based on an innovative recording program involving multiple sources p- and s-wave recording and 200-400 receivers in the spirit of PASSCAL and using PASSCAL as well as the principal investigators own recording systems.