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The science requirements on future gravity satellite missions, following from the previous contributions of this issue, are
summarized and visualized in terms of spatial scales, temporal behaviour and accuracy. This summary serves the identification
of four classes of future satellite mission of potential interest: high-altitude monitoring, satellite-to-satellite tracking,
gradiometry, and formation flights. Within each class several variants are defined. The gravity recovery performance of each
of these ideal missions is simulated. Despite some simplifying assumptions, these error simulations result in guidelines as
to which type of mission fulfils which requirements best. 相似文献
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R. Rummel 《Earth, Moon, and Planets》2004,94(1-2):103-111
Planetology serves the understanding on the one hand of the solar system and on the other hand, for investigating similarities
and differences, of our own planet. While observational evidence about the outer planets is very limited, substantial datasets
exist for the terrestrial planets. Radar and optical images and detailed models of gravity and topography give an impressive
insight into the history, composition and dynamics of moon and planets. However, there exists still significant lack of data.
It is therefore recommended to equip all future satellite missions to the moon and to planets with full tensor gravity gradiometers
and radar altimeters. 相似文献
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运用电子探针和显微Fourier变换红外光谱技术,对新疆西天山3个榴辉岩样品中的石榴石进行了详细的主量元素和结构水分析。结果显示,石榴石发育以核部富锰铝榴石组分、边部富镁铝榴石组分进变质作用的成分环带。石榴石中OH^-1分布也具有规律:核部→边缘。其结构水OH^-1逐步增加,即从核部的89-239ppm增加到边部的367-658ppm;与石榴石边部相比,石榴石的核部含有较低的OH^-1,却含有较高的H2O和Mn含量。这表明,在蓝片岩向榴辉岩进变质作用过程中,含水矿物脱水反应而释放出大量的分子水,这部分水促进了高压变质反应,形成榴辉岩相矿物,石榴石核部的结晶就是在富水和Mn的条件下进行的。随着高压变质作用的继续,石榴石核部的分子水逐步失水而进入石榴石晶格,形成结构水。因此,在高压变质作用过程中,OH^-1演化实际上是一个由内部不平衡逐步向平衡转变过程。P588.348 相似文献
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Origin of ore fluids in the Muruntau gold system: Constraints from noble gas, carbon isotope and halogen data 总被引:6,自引:0,他引:6
Torsten Graupner Samuel Niedermann Reiner Klemd Achim Bechtel 《Geochimica et cosmochimica acta》2006,70(21):5356-5370
Hydrothermal vein minerals directly associated with native gold mineralization in the Muruntau vein system (Uzbekistan) have been studied for noble gas, carbon isotope and halogen chemistry of the trapped ore-related fluids. Helium trapped in early arsenopyrite 1, which has preserved the original fluid signature better than associated scheelite and quartz, indicates a small input from a mantle source (?5% of total He). However, the overwhelming majority of the He in the fluid (∼95%) is from crustal sources. The noble gases Ne, Kr and Xe in the sample fluids are dominated by gases of atmospheric origin. The carbon isotope (δ13C: −2.1‰ to −5.3‰) and halogen characteristics of the fluids (log Br/Cl: −2.64 to −3.23) lend further support for the activity of juvenile fluids during the main ore stage. The high proportion of crustal components in the ore-forming fluids may be explained by intense fluid-rock interaction and is also supported by previous Nd and Sr isotope studies. The involvement of a juvenile fluid component during the main stage of hydrothermal activity at Muruntau (∼275 Ma) can be linked to the emplacement of lamprophyric dikes at Muruntau, due to apparently overlapping ages for high-temperature alteration, related ore vein formation and intrusion of the dikes. The input of mantle-derived fluids, possibly related to the Hercynian collisional event in the western Tien Shan, stimulated intense fluid-rock interaction in the crust. In this context, the mantle-derived fluid should be considered as one possible carrier of metals. Significant amounts of external meteoric fluids circulating in fracture systems are interpreted to have modified the noble gas signature of fluid in quartz, mostly during late, low temperature fluid circulation. 相似文献