Structure and Evolution of the Canada Basin: An Aerogeophysical Study

9321628 Brozena和Kovacs该奖项支持对加拿大盆地北方（北冰洋盆地的一部分）的地球物理调查。 对加拿大盆地构造演化的一个很好的约束性理解对于确定阿拉斯加、加拿大和西伯利亚的北方边缘的地质演化以及确定古气候变化发生的构造框架是至关重要的。 该地区目前的区域地球物理知识还不够完整，甚至不足以充分约束该地区的演化零级构造模型。 这反映在对这些模型的时间和最基本的构造特征的持续科学争议中。 该项目将对加拿大盆地北方进行区域航空重力-航空磁力调查，目的是确定该地区的结构和构造演化。为了进行这些飞行，海军研究实验室（NRL）将部署其RP-3猎户座远程飞机，该飞机配备了来自Pt.巴罗，阿拉斯加州的一个为期一至两个月的研究，在加拿大盆地的一部分选择提供最高的可能性，重要的构造特征诊断开放的方向和时间。美国国家科学基金会的资金将部分支持为期一个月的实地项目。NRL将通过内部研究基金和其他联邦机构的支持来支持成本的平衡。 AGSS由多个冗余重力仪、动态GPS和雷达/激光高度计系统以及一个标准的机载质子旋进磁力仪组成。1991年和1992年，该系统在格陵兰成功地收集了20多万行公里的高质量重力、磁力和地形数据。 此外，1992年，作为拟议工作的试点方案，在加拿大北极地区附近的北方加拿大海盆收集了40，000线公里的类似数据。 通常，在建议的高度和速度（600米和240节）下，该系统在轨道交叉点的精度约为2- 3 mGal（均方根），可分辨波长为15公里或更长的地壳特征。 该项目将在一个合作的国际计划框架下进行，该计划涉及来自美国，加拿大和俄罗斯的科学家。 这项工作将产生一个地球物理数据集，用于解释该地区的构造和地质演变，但该数据集也将被更广泛的地球科学界的许多部分使用。

9321628 Brozena and Kovacs This award supports a geophysical investigation of the northern Canada Basin, part of the Arctic Ocean basin. A well constrained understanding of the tectonic evolution of the Canada Basin is critical for determining the geological evolution of the northern margins of Alaska, Canada, and Siberia, and for determining the tectonic framework under which paleoclimatic change occurred. The current regional geophysical knowledge of the region is not complete enough to adequately constrain even zeroth-order tectonic models of the evolution of the region. This is reflected in the continuing scientific controversy over the timing and most basic tectonic characteristics of those models. This project will conduct a regional aerogravity- aeromagnetic investigation of the northern Canada Basin with the goal of determining the structure and tectonic evolution of this region. To conduct these flights, Naval Research Laboratory (NRL) will deploy its RP-3 Orion long-range aircraft equipped with the NRL Airborne Geophysical Sensor Suite (AGSS) from Pt. Barrow, Alaska for a one to two month study over a section of the Canada Basin chosen to provide the highest likelihood of important tectonic signatures diagnostic of opening direction and timing. Funds from NSF will partially support one month of the field program. NRL will support the balance of the costs with internal research funds and support from other Federal agencies. The AGSS consists of multiple redundant gravimeter, kinematic GPS, and radar/laser altimeter systems in addition to a standard airborne proton precession magnetometer. This system has successfully collected over 200,000 line-km of high quality gravity, magnetics, and topography data over Greenland in 1991 and 1992. In addition, 40,000 line-km of similar data were collected over the northern Canada Basin adjacent to Arctic Canada in 1992 as a pilot program for the proposed work. Typically, the accuracy of the system at the altitudes and speeds proposed (600m and 240 knots) is about 2- 3 mGal (root-mean-square) at the track crossings, resolving crustal features with wavelengths of 15 km and longer. The project will be performed under the framework of a cooperative, international program involving scientists from the United States, Canada, and Russia. This work will yield an geophysical data set that will be used to interpret the tectonic and geologic evolution of the region but the data set will also be used by many parts of the broader earth sciences community.