搜搜考试网急求纯手工翻译!谢谢各位!
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急求纯手工翻译!谢谢各位!
一Introduction
PRECIPITATION of copper sulfides from moderate-temperature, moderate- to high-salinity, oxidized fluids at oxidationreduction interfaces has been common since the Paleoproterozoic. The largest known deposits occur within sedimentary basins, generally at the contact between subaerial red-bed sequences and overlying marine or lacustrine shales, siltstones, sandstones, or carbonate rocks. Deposits in such settings have been termed sediment-hosted stratiform copper deposits (Kirkham, 1989) or sedimentary rock-hosted stratiform copper deposits (Cathles and Adams, 2005).
Sedimentary rock-hosted stratiform copper deposits consist of relatively thin (generally <30 m and commonly <3 m) sulfide-bearing zones that are peneconcordant with lithologic layering. The deposits occur in a variety of sedimentary rock types with a variety of reductants. The configuration of the mineralized zone ranges from sheetlike, with extensive horizontal dimensions, to tabular or roll-front geometries, with limited horizontal dimensions (Kirkham, 1989).
二Basin Architecture of the Sedimentary Rock-Hosted Stratiform Copper Deposits
Sedimentary rock-hosted stratiform copper deposits are the products of evolving basin-scale, or at least sub-basin-scale, fluid flow systems. Similar to all ore systems, these deposits can be thought of as the end products of processes involving a source(s) of metal and sulfur, a source(s) of metal-transporting fluid, transport paths, possible mobile reductants, a thermal or hydraulic pump, and the chemical and physical factors that result in precipitation (“trapping”) of the sulfides. Whereas the general nature of the ore fluids responsible for the formation of these deposits is clear (Rose, 1976; Brown, 1992), exact fluid compositions in terms of metal and sulfur contents are not known due to a lack of fluid inclusion data (Hitzman et al., 2005). This lack of data is the result of the absence of suitable coarse minerals, containing workable fluid inclusions, intergrown with sulfides in the vast majority of deposits.
三Critical Factors for the Formation of Sediment-Hosted Stratiform Copper Deposits
Sediment-hosted stratiform copper deposits require oxidized metal source beds (red beds), reduced facies to serve as metal traps, and saline brines capable of leaching and carrying metals. To form significant deposits, mineralizing fluids must be confined within the red beds and expelled through relatively focused zones, often in areas of stratal pinch out or linear structural zones. Potentially productive host rock sequences and geometric configurations are commonly found in rift basins.
一Introduction
PRECIPITATION of copper sulfides from moderate-temperature, moderate- to high-salinity, oxidized fluids at oxidationreduction interfaces has been common since the Paleoproterozoic. The largest known deposits occur within sedimentary basins, generally at the contact between subaerial red-bed sequences and overlying marine or lacustrine shales, siltstones, sandstones, or carbonate rocks. Deposits in such settings have been termed sediment-hosted stratiform copper deposits (Kirkham, 1989) or sedimentary rock-hosted stratiform copper deposits (Cathles and Adams, 2005).
Sedimentary rock-hosted stratiform copper deposits consist of relatively thin (generally <30 m and commonly <3 m) sulfide-bearing zones that are peneconcordant with lithologic layering. The deposits occur in a variety of sedimentary rock types with a variety of reductants. The configuration of the mineralized zone ranges from sheetlike, with extensive horizontal dimensions, to tabular or roll-front geometries, with limited horizontal dimensions (Kirkham, 1989).
二Basin Architecture of the Sedimentary Rock-Hosted Stratiform Copper Deposits
Sedimentary rock-hosted stratiform copper deposits are the products of evolving basin-scale, or at least sub-basin-scale, fluid flow systems. Similar to all ore systems, these deposits can be thought of as the end products of processes involving a source(s) of metal and sulfur, a source(s) of metal-transporting fluid, transport paths, possible mobile reductants, a thermal or hydraulic pump, and the chemical and physical factors that result in precipitation (“trapping”) of the sulfides. Whereas the general nature of the ore fluids responsible for the formation of these deposits is clear (Rose, 1976; Brown, 1992), exact fluid compositions in terms of metal and sulfur contents are not known due to a lack of fluid inclusion data (Hitzman et al., 2005). This lack of data is the result of the absence of suitable coarse minerals, containing workable fluid inclusions, intergrown with sulfides in the vast majority of deposits.
三Critical Factors for the Formation of Sediment-Hosted Stratiform Copper Deposits
Sediment-hosted stratiform copper deposits require oxidized metal source beds (red beds), reduced facies to serve as metal traps, and saline brines capable of leaching and carrying metals. To form significant deposits, mineralizing fluids must be confined within the red beds and expelled through relatively focused zones, often in areas of stratal pinch out or linear structural zones. Potentially productive host rock sequences and geometric configurations are commonly found in rift basins.
一言 从铜的硫化物沉淀中温,中到高盐度,氧化还原界面在氧化液已普遍古元古代以来.探明储量最大的沉积盆地内出现,一般在陆上之间的红层上覆海水或序列和湖相页岩,粉砂岩,砂岩,碳酸盐岩或接触.在这样的设置存款已被称...