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61.
The development of the Lancaster Sound Trough Mouth Fan (TMF) and glacial history in Arctic Canada were studied using a high‐resolution seismic profile across the entire fan and two piston cores. Stacked tills separated by erosion surfaces on the shelf pass seaward through till deltas into thick transparent glacigenic debris flow (GDF) deposits on the slope, separated by thin, well‐stratified glaciomarine layers. An age model was built by ties to the Ocean Drilling Program Site 645. The deepest GDF on the seismic profile was indicative of the onset of shelf‐crossing glaciation in the Early Pleistocene. The transition of the growth of Lancaster Sound TMF from an aggradational sequence (unit M) to an aggradational–progradational sequence (unit F) occurred at the Middle Pleistocene transition in glacial cyclicity. In the most recent glacial cycle, GDF sheets were deposited during Heinrich events 4 and 2 according to the correlation of the main detrital carbonate beds in two piston cores. The outmost till wedge reflects the maximum advance of the grounding glacier, far seaward of previously proposed Last Glacial Maximum ice extent. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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单纯克山病病区与单纯大骨节病病区生态化学环境的对比研究 总被引:6,自引:0,他引:6
本文对云南省牟定县申平村单纯克山病病区和陕北榆林县蟒坑村单纯大骨节病病区的生态化学环境进行了对比研究,表明两地生态化学环境仍处于低Se水平。申平村人群仍有潜在型克山病病例,蟒坑村人群的骨质病变则出现很高的X线阳性检出率,说明两地的致病因子仍然活跃,从生态系物质含Se量看出,蟒坑村的缺Se程度较申平村高。此外,单纯克山病病区申平村土壤,粮食,人发中的As明显高于蟒坑村和非病区。为此,从As与Se具有 相似文献
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本文应用CT对42例脑血管病急性期病人进行检查,结果表明:CT在脑血管病急性期定性诊断中具有首选价值.尤其对出血性脑血管病最为实用,对超早期缺血性脑血管病虽然不如MRI敏感,但应用CT动感观察可以弥补这方面的不足,这对无设备的单位更为重要,DSA对脑动脉瘤、脑动静脉畸型、脑血管狭窄的诊断较特异。 相似文献
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Processing of gravity and magnetic maps shows that the basement of the Upper Rhine Graben area is characterized by a series
of NE–SW trending discontinuities and elongated structures, identified in outcrops in the Vosges, Black Forest, and the Odenwald
Mountains. They form a 40 km wide, N30–40° striking, sinistral wrench-zone that, in the Visean, shifted the Variscan and pre-Variscan
structures by at least 43 km to the NE. Wrenching was associated with emplacement of several generations of plutonic bodies
emplaced in the time range 340–325 Ma. The sub-vertical, NE–SW trending discontinuities in the basement acted as zones of
weakness, susceptible to reactivation by subsequent tectonism. The first reactivation, marked by mineralizations and palaeomagnetic
overprinting along NE–SW faults of the Vosges Mountains, results from the Liassic NW–SE extension contemporaneous with the
break-up of Pangea. The major reactivation occurred during the Late Eocene N–S compression and the Early-Middle Oligocene
E–W extension. The NE–SW striking basement discontinuities were successively reactivated as sinistral strike-slip faults,
and as oblique normal faults. Elongated depocenters appear to form in association with reactivated Variscan wrench faults.
Some of the recent earthquakes are located on NE–SW striking Variscan fault zones, and show sinistral strike-slip focal mechanisms
with the same direction, suggesting also present reactivation. 相似文献
67.
环境氟与人体健康——致世界卫生组织的一封公开信 总被引:5,自引:0,他引:5
总结了环境中的氟与人体健康的关系。呼吁人们不可忽视微量元素氟对人体的生理功能,摄入不足轻则臻龋齿,重则导臻大骨节病的发生;在全面认识氟的基础上,发现了卤素和人体健康有氟主骨,氯主心,溴主神和碘主智的重要关系。同时提出“元素丰欠皆致病”和“多祛少补乃原则”的地方病发病机制和治疗原则;地方病的防治提倡食疗和饮疗,最后建议地方病以摄入的元素多少来命名,因为它既能反映致病原因,又明确了治疗方法,医患皆知。 相似文献
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Paolo Laj Andrea I. Flossmann Wolfram Wobrock Sandro Fuzzi Giordano Orsi Loretta Ricci Stephan Mertes Alfons Schwarzenbck Jost Heintzenberg Harry Ten Brink 《Atmospheric Research》2001,58(4):256
We investigated the partitioning of trace substances during the phase transition from supercooled to mixed-phase cloud induced by artificial seeding. Simultaneous determination of the concentrations of H2O2, NH3 and black carbon (BC) in both condensed and interstitial phases with high time resolution showed that the three species undergo different behaviour in the presence of a mixture of ice crystals and supercooled droplets. Both H2O2 and NH3 are efficiently scavenged by growing ice crystals, whereas BC stayed predominantly in the interstitial phase. In addition, the scavenging of H2O2 is driven by co-condensation with water vapour onto ice crystals while NH3 uptake into the ice phase is more efficient than co-condensation alone. The high solubility of NH4+ in the ice could explain this result. Finally, it appears that the H2O2–SO2 reaction is very slow in the ice phase with respect to the liquid phase. Our results are directly applicable for clouds undergoing limited riming. 相似文献
70.
利用非金属矿制备白炭黑现状及发展前景 总被引:8,自引:0,他引:8
简术了白炭黑的用途和制备方法,综述了利用非金属矿制备白炭黑的方法和技术现状,对充分利用非金属矿制备白炭黑提供思路并展望其发展前景。 相似文献