標(biāo)題: Titlebook: Basement Tectonics 10; Richard W. Ojakangas,Albert B. Dickas,John C. Gree Book 1995 Springer Science+Business Media B.V. 1995 Sedimentatio [打印本頁] 作者: Gratification 時(shí)間: 2025-3-21 16:38
書目名稱Basement Tectonics 10影響因子(影響力)
作者: 頌揚(yáng)國家 時(shí)間: 2025-3-21 22:32 作者: 壓迫 時(shí)間: 2025-3-22 03:57 作者: savage 時(shí)間: 2025-3-22 05:30
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作者: 爆米花 時(shí)間: 2025-3-22 11:30
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作者: 烤架 時(shí)間: 2025-3-22 16:05 作者: IRS 時(shí)間: 2025-3-22 20:41
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作者: ITCH 時(shí)間: 2025-3-22 21:29
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 作者: 調(diào)色板 時(shí)間: 2025-3-23 04:12 作者: Minatory 時(shí)間: 2025-3-23 08:20
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作者: 雪白 時(shí)間: 2025-3-23 12:04
Volcanic Rocks of the Midcontinent Rift System: A Reviewse constitute one of the largest as well as oldest flood basalt provinces. Both geophysical (Hutchinson et al. 1990) and geochemical evidence (Nicholson and Shirey 1990) suggest that magma production resulted from decompression melting of a large, hot mantle plume centered beneath what is now Lake S作者: 裝入膠囊 時(shí)間: 2025-3-23 14:37 作者: Diskectomy 時(shí)間: 2025-3-23 21:33 作者: eczema 時(shí)間: 2025-3-24 01:13 作者: Glaci冰 時(shí)間: 2025-3-24 05:24 作者: visual-cortex 時(shí)間: 2025-3-24 07:50
The Port Coldwell Veins, Northern Ontario: Pb-Zn-Ag Deposits in a Rift Settingdes are: 52.94% Pb, 15.60% Zn, 60.49 oz. Ag/t (Deadhorse Creek South; Patterson et al. 1985) and 7.06% Pb, 25.85% Zn, 0.185% Cu, 41.57 oz. Ag/t and 0.01 oz. Au/t (Morley High Grade; Patterson et al. 1984).作者: 乞丐 時(shí)間: 2025-3-24 14:38
THE END OF THE HUMAN SPIRIT: THE , OF 1795xcept in the Lake Superior basin region; therefore, its location and attributes are for the most part known from its profound geophysical signature and limited, poorly distributed deep drill holes. Except for the East African Rift System, this rift is unparalleled in its extent and impact upon the nature of the entire crust.作者: endoscopy 時(shí)間: 2025-3-24 18:45 作者: fastness 時(shí)間: 2025-3-24 22:37
Value, Fact and Concrete Ethics,rring approximately 1108–1094 Ma (Paces and Davis 1988). As igneous activity waned, a suite of upward maturing clastic strata was deposited. Finally, the tectonic focus changed from extension to compression, and a final phase of clastic sedimentation occurred.作者: 燕麥 時(shí)間: 2025-3-25 01:45 作者: 有幫助 時(shí)間: 2025-3-25 04:32 作者: 頌揚(yáng)國家 時(shí)間: 2025-3-25 08:27 作者: 開玩笑 時(shí)間: 2025-3-25 14:16 作者: Painstaking 時(shí)間: 2025-3-25 17:44
https://doi.org/10.1007/978-3-319-75611-0es in the Lake Superior region included seismic reflection and refraction surveys conducted in 1986 and aeromagnetic surveys in 1987. These surveys provided new information on the character of the Midcontinent Rift System around and beneath Lake Superior.作者: 教唆 時(shí)間: 2025-3-25 20:47 作者: 使聲音降低 時(shí)間: 2025-3-26 00:24
Summary of Glimpce Geophysical Investigations of the Midcontinent Rift System in the Lake Superior Res in the Lake Superior region included seismic reflection and refraction surveys conducted in 1986 and aeromagnetic surveys in 1987. These surveys provided new information on the character of the Midcontinent Rift System around and beneath Lake Superior.作者: 不能逃避 時(shí)間: 2025-3-26 07:20
Petrography and Sedimentation of the Middle Proterozoic (Keweenawan) Nonesuch Formation, Western Laka, coupled with the information from outcrops in northwest Wisconsin and upper Michigan, provide evidence on source rocks, environment of deposition, and the tectonic framework of the Nonesuch Formation in the Midcontinent Rift System.作者: Aggregate 時(shí)間: 2025-3-26 12:18
A Review of Sulfide, Platinum Group Element and Oxide Mineralization along the Western Contact of th作者: 導(dǎo)師 時(shí)間: 2025-3-26 13:20 作者: poliosis 時(shí)間: 2025-3-26 17:48 作者: 種類 時(shí)間: 2025-3-26 23:40
Book 1995n district of Minnesota, considered to be the best example of an Archean greenstone belt in the United States. All registrants participated in the mid-conference trip conducted along the gabbroic and volcanic terrain of the "Midcontinent Rift, Northeastern Minnesota".作者: Immunization 時(shí)間: 2025-3-27 03:02 作者: 鋼盔 時(shí)間: 2025-3-27 07:59
Relationship between Native Copper Deposits and Tectonic Development of the North American Midcontin about 1060+/?20 Ma (Cannon et al. 1990; Nicholson et al. 1992). Continued movements on the Keweenaw fault with multiple kilometers of reverse displacement, caused further steepening of dips to present attitudes. Within rift-filling strata, the faults, fractures, and broad open folds are related to 作者: 蒸發(fā) 時(shí)間: 2025-3-27 10:48
The Finland Tectono-Magmatic Discontinuity— A Growth Fault Marking the Western Margin of the Portageasin terminates in the western Lake Superior region in a structurally complex manner Although geologic interpretations of some seismic profiles (Grant-Norpac lines 57 and 53, Fig. 1) by us and others (Thompson et al. 1990; Sexton and Henson 1994) suggest that the PLV sequence projects onshore in nor作者: TEM 時(shí)間: 2025-3-27 15:16 作者: jaunty 時(shí)間: 2025-3-27 20:10 作者: Pruritus 時(shí)間: 2025-3-28 00:52 作者: 執(zhí)拗 時(shí)間: 2025-3-28 03:13
Paleozoic Rifting in New England, New Brunswick and Nova Scotia, U.S.A. and Canadaontrolled by basement faults which, in turn, helped control the position of Mesozoic rift basins..Prior to the Middle Devonian, lesser rifting events took place along and near the suture zone bordering the southeast side of the ancient North American plate. Lateral movement in this zone resulted in 作者: choleretic 時(shí)間: 2025-3-28 07:40
The Characteristics of Granite in a Cambrian Riftops constitute the bulk of the Wichita Mountains of southwestern Oklahoma. Interestingly, this level of exposure is also coincident to parts of the Cambrian unconformity marking the end of the rifting event.作者: Urea508 時(shí)間: 2025-3-28 13:20
https://doi.org/10.1007/978-3-476-00502-1 about 1060+/?20 Ma (Cannon et al. 1990; Nicholson et al. 1992). Continued movements on the Keweenaw fault with multiple kilometers of reverse displacement, caused further steepening of dips to present attitudes. Within rift-filling strata, the faults, fractures, and broad open folds are related to 作者: 粗鄙的人 時(shí)間: 2025-3-28 18:33 作者: PLUMP 時(shí)間: 2025-3-28 19:20
https://doi.org/10.1007/978-1-349-11612-6on of the area is documented by the significant reverse motion along the Keweenaw, Isle Royale, Douglas, and Lake Owen faults (Cannon et al. 1989), it is likely this motion has been translated and modified by other activities along the North Shore of Minnesota.作者: 甜食 時(shí)間: 2025-3-29 02:35 作者: Affiliation 時(shí)間: 2025-3-29 03:55
https://doi.org/10.1007/978-1-349-11612-6cially in Minnesota (Green 1982). Structural and stratigraphic relationships of these lavas indicate that they were erupted in several distinct plateaus, each of which subsided centrally as rifting intensity shifted in time and place along the MRS (Green 1977; 1983), but age determinations so far sh作者: 精確 時(shí)間: 2025-3-29 08:20 作者: blight 時(shí)間: 2025-3-29 14:57 作者: Mediocre 時(shí)間: 2025-3-29 18:04 作者: 嚴(yán)峻考驗(yàn) 時(shí)間: 2025-3-29 21:48
Hegels Logik und die Moderne PhysikIn 1856, David Owen first noted the existence of the Rough CreekShawneetown Fault System. Since that date, evidence has slowly accumulated to indicate the existence of a major polyphase rift complex crosscutting the east-central North American craton.作者: 執(zhí)拗 時(shí)間: 2025-3-30 00:41 作者: 無可非議 時(shí)間: 2025-3-30 07:46
Sedimentary Fill of the 1100 Ma (Keweenawan) Midcontinent Rift System in the Lake Superior RegionIn the Lake Superior region, four “sequences” of sedimentary rocks reflect the tectonic-sedimentary framework immediately before, during, and after the 1100 Ma magmatic event that resulted in as much as 20,000 m of dominantly basaltic subaerial lava flows and large gabbroic intrusions (Behrendt et al. 1988).作者: GLARE 時(shí)間: 2025-3-30 08:35
In Search of the East Continent Rift Complex: Evidence and ConclusionsIn 1856, David Owen first noted the existence of the Rough CreekShawneetown Fault System. Since that date, evidence has slowly accumulated to indicate the existence of a major polyphase rift complex crosscutting the east-central North American craton.作者: 掃興 時(shí)間: 2025-3-30 15:28 作者: 五行打油詩 時(shí)間: 2025-3-30 18:25
THE END OF THE HUMAN SPIRIT: THE , OF 1795Proterozoic time. The most prominent of these rifts in terms of extent and effect upon the crust is the Midcontinent Rift system (MCR) which extends in a series of generally linear segments in an arcuate pattern for a distance of over 2000 km from southern Kansas to the Lake Superior basin and then 作者: 獨(dú)白 時(shí)間: 2025-3-30 22:34 作者: IOTA 時(shí)間: 2025-3-31 02:02 作者: Ingredient 時(shí)間: 2025-3-31 08:01 作者: 驕傲 時(shí)間: 2025-3-31 11:29
https://doi.org/10.1007/978-3-476-00502-1eath 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作者: Harbor 時(shí)間: 2025-3-31 16:36 作者: 脆弱么 時(shí)間: 2025-3-31 20:10 作者: 可觸知 時(shí)間: 2025-3-31 22:36
