Relation of regional crustal structures and the distribution of ore deposits in western USA based on magnetic and gravity data
Hildenbrand, T.G.; Jachens, R.C.; Ludington, S.; Berger, B.
published: Dec 1, 1999
ArtNo. ESP136000702010, Price: 19.00 €
Upgraded gravity and magnetic databases and associated filtered-anomaly maps of western United States are used to define regional crustal fractures that may have guided the emplacement of plutonic rocks and large metallic ore deposits. In particular, regional gravity and magnetic data aid in understanding the distribution of large Mesozoic and Cenozoic endogenic ore deposits (primarily epithermal and porphyry precious- and base-metal deposits and sediment-hosted gold deposits) in the western U.S. cordillera. For example, the Mesozoic Mother Lode gold belt closely follows a well defined NNW-trending gravity high reflecting dense mafic plutons that are likely related to the genesis of the deposits. Geophysically-defined structural lineaments characterize the Idaho-Montana porphyry belt and the La Caridad-Mineral Park belt (in southern Arizona) and thus support a deep-seated control for these mineral belts. This study of mineral deposits of western U.S. demonstrates the ability of magnetic and gravity data to elucidate the regional geologic framework and help to predict generally favorable environments for hydrothermal mineralization.