Extracting ore-deposit-controlling structures from aeromagnetic, gravimetric, topographic, and regional geologic data in western Yukon and eastern Alaska
Extracting ore-deposit-controlling structures from aeromagnetic, gravimetric, topographic, and regional geologic data in western Yukon and eastern Alaska
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从育空地区西部和阿拉斯加东部的航磁、重力、地形和区域地质数据中提取控矿构造
DOI：
10.1190/int-2014-0104.1
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发表时间：
2014
期刊：
影响因子：
0.3
通讯作者：
J. K. Mortensen
中科院分区：
文献类型：
--
作者：
M. Sánchez;M. Allan;C. Hart;J. K. Mortensen
从还原到极（RTP）磁网格解释的航空磁线性构造与重力、地形和基于实地的地质图进行了比较，以推断在育空地区西部和阿拉斯加东部北美科迪勒拉暴露不良的部分热液矿产的区域结构控制。高频和可变强度的航磁线性体对应的不连续性与航空磁畴的变化被解释为陡倾角和磁铁矿破坏性或磁铁矿添加剂故障。这些构造被解释为主要是白垩纪的，是在山间火山岩与北美古太平洋边缘碰撞后形成的。为了证明航磁解释的可靠性，我们开发了一种多数据集叠加方法，该方法根据RTP航磁梯度的残差和一阶垂直导数，将数值分配给各个线性体。
AbstractAeromagnetic lineaments interpreted from reduced-to-pole (RTP) magnetic grids were compared with gravity, topography, and field-based geologic maps to infer regional structural controls on hydrothermal mineral occurrences in a poorly exposed portion of the North American Cordillera in western Yukon and eastern Alaska. High-frequency and variable-intensity aeromagnetic lineaments corresponding to discontinuities with an aeromagnetic domain change were interpreted as steep-dipping and either magnetite-destructive or magnetite-additive faults. These structures were interpreted to be predominantly Cretaceous in age and to have formed after the collision of the Intermontane terranes with the ancient Pacific margin of North America. To demonstrate the reliability of the aeromagnetic interpretation, we developed a multidata set stacking methodology that assigns numeric values to individual lineaments depending on whether they can be traced in residuals and first vertical derivative of RTP aeromagnetic gr...