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1.
The mineralogy of shocked mineral and lithic grains in the Cretaceous-Tertiary (K-T) boundary claystone worldwide is most consistent with a bolide impact on a continent. Both the concentrations and sizes of these shocked grains are greatest in the western interior of North America. These data suggest that the Manson impact structure in north-central Iowa is a viable candidate for the K-T boundary impact event. Argon-40-argon-39 age spectrum dating of shocked microcline from the crystalline central uplift of the Manson impact structure indicates that there was severe argon-40 loss at 65.7 +/- 1.0 million years ago, an age that is indistinguishable from that of the K-T boundary, within the limits of analytical precision. 相似文献
2.
A method for dating clays is important for studies of weathering, diagenesis, hydrocarbon migration, and the formation of major metalliferous deposits. However, many attempts have produced imprecise or inaccurate results. Data from shales show that, contrary to expectations, the (40)Ar-(39)Ar dating technique can be successfully used to determine the diagenetic age of ancient sediments because (39)Ar losses during irradiation are controlled by release from low retentivity sites in illite equivalent to those that have lost radiogenic (40)Ar in nature, rather than by direct recoil as is generally assumed. 相似文献
3.
Evidence from the Irish Sea basin supports the existence of an abrupt rise in sea level (meltwater pulse) at 19,000 years before the present (B.P.). Climate records indicate a large reduction in the strength of North Atlantic Deep Water formation and attendant cooling of the North Atlantic at this time, indicating a source of the meltwater pulse from one or more Northern Hemisphere ice sheets. Warming of the tropical Atlantic and Pacific oceans and the Southern Hemisphere also began at 19,000 years B.P. These responses identify mechanisms responsible for the propagation of deglacial climate signals to the Southern Hemisphere and tropics while maintaining a cold climate in the Northern Hemisphere. 相似文献
4.
Magnetostratigraphic studies are widely used in conjunction with the geomagnetic polarity time scale (GPTS) to date events in the range 0 to 5 million years ago. A critical tie point on the GPTS is the potassium-argon age of the most recent (Brunhes-Matuyama) geomagnetic field reversal. Astronomical values for the forcing frequencies observed in the oxygen isotope record in Ocean Drilling Project site 677 suggest that the age of this last reversal is 780 ka (thousand years ago), whereas the potassium-argon-based estimate is 730 ka. Results from 4039; Ar incremental heating studies on a series of lavas from Maui that straddle the Brunhes-Matuyama reversal give an age of 783 + 11 ka, in agreement with the astronomically derived value. The astronomically based technique appears to be a viable tool for dating young sedimentary sequences. 相似文献
5.
The (40)Ar/(39)Ar ages of a sanidine clast from a melt-matrix breccia of the Manson, Iowa, impact structure (MIS) indicate that the MIS formed 73.8 +/- 0.3 million years ago (Ma) and is not coincident with the Cretaceous-Tertiary boundary (64.43 +/- 0.05 Ma). The MIS sanidine is 9 million years older than (40)Ar/(39)Ar age spectra of MIS shock-metamorphosed microcline and melt-matrix breccia interpreted earlier to be 64 to 65 Ma. Grains of shock-metamorphosed quartz, feldspar, and zircon were found in the Crow Creek Member (upper Campanian) at a biostratigraphic level constrained by radiometric ages in the Pierre Shale of South Dakota that are consistent with the (40)Ar/(39)Ar age of 73.8 +/- 0.3 Ma for MIS reported herein. 相似文献
6.
Rogers RR Swisher CC Sereno PC Monetta AM Forster CA Martínez RN 《Science (New York, N.Y.)》1993,260(5109):794-797
(40)Ar/(39)Ar dating of sanidine from a bentonite interbedded in the Ischigualasto Formation of northwestern Argentina yielded a plateau age of 227.8 +/- 0.3 million years ago. This middle Carnian age is a direct calibration of the Ischigualasto tetrapod assemblage, which includes some of the best known early dinosaurs. This age shifts last appearances of Ischigualasto taxa back into the middle Carnian, diminishing the magnitude of the proposed late Carnian tetrapod extinction event. By 228 million years ago, the major dinosaurian lineages were established, and theropods were already important constituents of the carnivorous tetrapod guild in the Ischigualasto-Villa Unión Basin. Dinosaurs as a whole remained minor components of tetrapod faunas for at least another 10 million years. 相似文献
7.
An atmospheric general circulation model was forced with observed interannual changes in the global sea surface temperatures (SSTs) for the period 1982 to 1993. The simulated seasonal surface air temperature patterns over land areas closely resemble the observed. Over most of the globe, the patterns also resemble those associated with EI Ni?o events and are also reproduced in simulations with weak warm tropical SSTs near the date line. An exception is northern Asia, where the mechanisms for the observed warming are unclear. The results suggest that enhanced air-sea interactions resulting from recent, more persistent warm oceanic conditions in the tropics contributed to the observed global warming trend during this period. 相似文献
8.
Negative differential resistance (NDR) is the essential property that allows fast switching in certain types of electronic devices. With scanning tunneling microscopy (STM) and scanning tunneling spectroscopy, it is shown that the current-voltage characteristics of a diode configuration consisting of an STM tip over specific sites of a boron-exposed silicon(111) surface exhibit NDR. These NDR-active sites are of atomic dimensions ( approximately 1 nanometer). NDR in this case is the result of tunneling through localized, atomic-like states. Thus, desirable device characteristics can be obtained even on the atomic scale. 相似文献
9.
Kodiak Seamount and Giacomini Guyot have been dated at 22.6 +/- 1.1 and 19.9 +/- 1.0 [2sigma (standard deviation)] x 10(6) years, respectively. Concordant whole-rock and plagioclase potassium-argon dates and fission-track apatite ages demonstrate that significant quantities of excess radiogenic (40)Ar are not present in the dated samples. These seamounts are the northwesternmost edifices of the Pratt-Welker chain, which cuts obliquely across magnetic anomaly patterns in an older northeastern Pacific sea floor. The older of the two dated seamounts is in the Aleutian Trench, apparently about to be subducted. If one assumes that seamounts are generated by plate motion over a fixed hot spot in the mantle, a Pacific-plate motion of 6.6 centimeters per year during early Miocene time may be calculated. 相似文献
10.
Deuser WG 《Science (New York, N.Y.)》1970,168(3939):1575-1577
A combination of measurements of carbon-13 and the hydrogen sulfide content in Black Sea waters with available data on the total carbon dioxide in these waters indicates that the contribution of organic sulfur to the hydrogen sulfide lies between 3 and 5 percent and increases with depth. Likely causes for the increase are increasing productivity or upward movement of the anoxic zone during the facts last 2000 year. 相似文献
11.
Engel AE 《Science (New York, N.Y.)》1963,140(3563):143-152
The oldest decipherable rock complexes within continents (more than 2.5 billion years old) are largely basaltic volcanics and graywacke. Recent and modern analogs are the island arcs formed along and adjacent to the unstable interface of continental and oceanic crusts. The major interfacial reactions (orogenies) incorporate pre-existing sial, oceanic crust, and mantle into crust of a more continental type. Incipient stages of continental evolution, more than 3 billion years ago, remain obscure. They may involve either a cataclysmic granite-forming event or a succession of volcanic-sedimentary and granite-forming cycles. Intermediate and recent stages of continental evolution, as indicated by data for North America, involve accretion of numerous crustal interfaces with fragments of adjacent continental crust and their partial melting, reinjection, elevation, unroofing, and stabilization. Areas of relict provinces defined by ages of granites suggest that continental growth is approximately linear. But the advanced differentiation found in many provinces and the known overlaps permit wide deviation from linearity in the direction of a more explosive early or intermediate growth. 相似文献
12.
Neupane Jasmine Guo Wenxuan Cao Guofeng Zhang Fangyuan Slaughter Lindsey Deb Sanjit 《Precision Agriculture》2022,23(3):1008-1026
Precision Agriculture - Understanding the spatial patterns of soil microbial communities and influencing factors is a prerequisite for soil health assessments and site-specific management to... 相似文献
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草原畜牧业适度规模经营:规模报酬、产出水平与生产成本 总被引:1,自引:0,他引:1
为推进我国草原畜牧业适度规模经营,本研究以绒毛用羊为例,基于内蒙古、甘肃、新疆、辽宁、河北和四川6省371户绒毛用羊养殖户的调查数据,分别从规模报酬、产出水平和生产成本3个方面研究了草原畜牧业适度经营规模问题。实证结果表明,在考虑政府技术培训情况及禁牧政策实施情况下,现阶段调研地区绒毛用羊生产存在规模报酬递增的现象,较大规模农牧户生产存在规模经济,为适度的绒毛用羊经营规模。此外,技术培训有助于农牧户生产产出和利润的增加以及生产成本的降低;禁牧政策的实施增加了养殖户的生产成本,从而对其生产利润具有负向影响。因此,应适当扩大草原畜牧业养殖规模,增加技术培训次数,开发饲料饲草资源,促进草原畜牧业的健康发展。 相似文献
15.
The light use efficiency (LUE) of photosynthesis dynamically adapts to environmental factors, and this leads to complex spatio-temporal
variations of photosynthesis on various scales from the leaf to the canopy level. These spatio-temporal pattern formations
not only help to understand the regulatory properties of photosynthesis, but may also have a constructive role in maintaining
stability in metabolic pathways and during development. Optical remote sensing techniques have the potential to detect physiological
and biochemical changes in plant ecosystems, and non-invasive detection of changes in photosynthetic energy conversion may
be of great potential for managing agricultural production in a future bio-based economy. Here we review the results from
selected remote sensing projects for their potential to quantify LUE from the level of single leaves to the canopy scale.
In a case study with soybean grown under elevated CO2 conditions at the SoyFACE facility, we tested the photochemical reflectance index (PRI) for its capacity to quantify higher
photosynthetic efficiency. In this study the PRI failed to detect differences in photosynthetic light conversion, most likely
because of the variable canopy structure of the soybean canopy. We thus conclude that at the current state of the art the
PRI cannot serve as an easy remote sensing approach to detect changes in photosynthetic energy conversion in agriculture.
As an alternative we present approaches that aim to quantify the fluorescence signal of chlorophyll and thus estimate photosynthetic
efficiency. In a second case study, using avocado as a model species, an active laser induced fluorescence transient (LIFT)
method was applied to deliver maps of different photosynthetic efficiency within the canopy. Cold-induced down-regulation
of photosynthesis in the upper canopy was detected, so active fluorescence may prove its potential for non-invasive monitoring
of crops. With a view to the future, we present a method for large scale managing of agricultural practices within the framework
of the FLuorescence EXplorer (FLEX) mission, which proposed launching a satellite for the global monitoring of steady-state
chlorophyll fluorescence in terrestrial vegetation. This mission was selected for inclusion in pre-phase A by the European
Space Agency. 相似文献
16.
Chimpanzee bipedalism: cineradiographic analysis and implications for the evolution of gait 总被引:2,自引:0,他引:2
F A Jenkins 《Science (New York, N.Y.)》1972,178(63):877-879
Bipedal chimpanzees reorient the pelvis to achieve an upright posture but retain the same pattern of femoral flexion and extension as in quadrupedal walking. Major differences from human gait are the abducted, relatively more flexed excursion of the femur and the timing of pelvic tilt, which raises during the swing phase. The femoral head morphology in the fossil hominid Australopithecus robustus is evidence of an approximately vertical excursion of the femur in contrast to the adducted pattern of modern man and the abducted pattern of chimpanzees. 相似文献
17.
Russell RJ 《Science (New York, N.Y.)》1963,139(3549):9-15
My fieldwork in various parts of the world leads me to the conclusion that the retreat of cliffy coasts through abrasion and solutional erosion during Recent times has produced a whole complex of forms, including conspicuous benches well above sea level where bedrock conditions are favorable. In addition, flats of other origin are being developed at various levels. Broad exposures of beach rock are a marine phenomenon only in that such exposure is a result of beach recession and of the uncovering of materials that had been cemented, under freshwater conditions, along water tables, in some places 6 or more feet above sea level (24, 25). Contemporary coral and algal flats are forming in some instances several feet above the level of the highest tides. 相似文献
18.
Jianbo SHEN Liyang WANG Xiaoqiang JIAO Fanlei MENG Lin ZHANG Gu FENG Junling ZHANG Lixing YUAN Lin MA Yong HOU Tao ZHANG Weifeng ZHANG Guohua LI Kai ZHANG Fusuo ZHANG 《农业科学与工程前沿(英文版)》2019,6(4):321
Phosphorus (P) is a non-renewable resource, therefore ensuring global food and environmental security depends upon sustainable P management. To achieve this goal, sustainable P management in the upstream and downstream sectors of agriculture from mineral extraction to food consumption must be addressed systematically. The innovation and feasibility of P sustainability are highlighted from the perspective of the whole P-based chain, including the mining and processing of P rock, production of P fertilizers, soil and rhizosphere processes involving P, absorption and utilization of P by plants, P in livestock production, as well as flow and management of P at the catchment scale. The paper also emphasizes the importance of recycling P and the current challenges of P recovery. Finally, sustainable solutions of holistic P management are proposed from the perspective of technology improvement with policy support. 相似文献
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Béjà O Aravind L Koonin EV Suzuki MT Hadd A Nguyen LP Jovanovich SB Gates CM Feldman RA Spudich JL Spudich EN DeLong EF 《Science (New York, N.Y.)》2000,289(5486):1902-1906
Extremely halophilic archaea contain retinal-binding integral membrane proteins called bacteriorhodopsins that function as light-driven proton pumps. So far, bacteriorhodopsins capable of generating a chemiosmotic membrane potential in response to light have been demonstrated only in halophilic archaea. We describe here a type of rhodopsin derived from bacteria that was discovered through genomic analyses of naturally occuring marine bacterioplankton. The bacterial rhodopsin was encoded in the genome of an uncultivated gamma-proteobacterium and shared highest amino acid sequence similarity with archaeal rhodopsins. The protein was functionally expressed in Escherichia coli and bound retinal to form an active, light-driven proton pump. The new rhodopsin exhibited a photochemical reaction cycle with intermediates and kinetics characteristic of archaeal proton-pumping rhodopsins. Our results demonstrate that archaeal-like rhodopsins are broadly distributed among different taxa, including members of the domain Bacteria. Our data also indicate that a previously unsuspected mode of bacterially mediated light-driven energy generation may commonly occur in oceanic surface waters worldwide. 相似文献