Titlebook: Basement Tectonics 10; Richard W. Ojakangas,Albert B. Dickas,John C. Gree Book 1995 Springer Science+Business Media B.V. 1995 Sedimentatio

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颂扬国家

压迫

savage

The Port Coldwell Veins, Northern Ontario: Pb-Zn-Ag Deposits in a Rift Settingon, Ontario (Fig. 1). Although ore tonnages are small and only very minor production has come from the deposits, ore grades are high. The deposits contain galena, sphalerite, pyrite, chalcopyrite, covellite, digenite, and freibergite, the silver carrier, in calcite and quartz gangue. Typical ore gra

爆米花

Relationship between Native Copper Deposits and Tectonic Development of the North American Midcontineath Lake Superior the rift is filled by more than 18 km of subaerial basalt lava flows with minor interflow sedimentary beds overlain by up to 12 km of dominantly red clastic sedimentary rocks (Cannon et al. 1989). Magmatism (passive rifting) lasted from 1109 to 1087 Ma while sedimentation (post-ri

烤架

IRS

Structural Geometry of the Superior Zone, Midcontinent Rift Systemetic data, subsurface drilling, and outcrop control over a length of 2,000 km within the central United States (Van Schmus and Hinze 1985; Cannon et al. 1989) (Fig. I). Outcrop, known only in the Lake Superior region, in conjunction with geopotential data, defines a polyphase tectonic basin filled p

ITCH

The Finland Tectono-Magmatic Discontinuity— A Growth Fault Marking the Western Margin of the Portageawan lavas are contained within asymmetric grabens bounded by what are now listric reverse faults, but which must have acted as normal growth faults during much of the volcanism (Chandler et al. 1989; Cannon et al. 1989; Cannon 1992; Thomas and Teskey 1994). This is particularly true of the Portage

调色板

Minatory

Tectonic Implications and Influence of the Midcontinent Rift System in Nebraska and Adjoining Areasere intruded by Middle Proterozoic epizonal plutons (1340–1480 Ma). The Midcontinent rift System was imposed upon and reflects the pre-existing tectonic grain of the older basement. This correspondence of the trends of the Rift segments with older tectonic zones has been noted by Klasner et al. (198