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11.
Yeşim Çoban-Yildiz Alec F. Gaines Pat E. Keating Gordon D. Love Dennis McLoughlin Colin E. Snape 《Organic Geochemistry》2009,40(2):270-282
The suspended particulate organic matter, SPOM, in the autumnal Black Sea has been characterised using catalytic hydropyrolysis (HyPy) of the total (bound plus free) lipid material. The technique, which generates maximum yields of volatile products from sediments, kerogens and phytoplankton, was followed using gas chromatography and gas chromatography/mass spectrometry. The generated alkanes were dominated by n-C18, hypothesised to arise predominantly from unsaturated C18 fatty acids. Steranes were generated from reductive conversion of free and bound sterols. The generation of branched alkanes and especially of hopanes provided formal evidence for the participation of bacteria in the mineralisation of the SPOM. Whereas similar distributions of n-alkanes were generated from SPOM sampled from different depths of the comparatively well-stirred Rhodes Gyre (eastern Mediterranean), mineralisation of the SPOM at each depth of the central Black Sea produced characteristic changes in the composition and concentration of the HyPy products. Depth profiles of the n-alkanes generated from SPOM in the region of the Rim Current were affected by the local hydrography. Polynuclear aromatic hydrocarbons (PAHs) of anthropogenic origin were present in the surface waters of the central Black Sea. Some methyl benzenes, thiophenes and pyrroles were also generated. 相似文献
12.
The greenstone belt and metamorphosed microclastic rock-type superlarge gold deposits in China are hosted in metamorphic rocks and later intrusive bodies.Sedimentation.regional metamorphism and mineralization contributed a lot to the formation of the deposits,so did remelting magmatic process to some deposits,but the deposits were finally formed by reworking processes.The key factor leading to the formation of superlarge gold deposits is the reworking intensity,which for superlarge gold deposits is reflected by the large-scale reworked source rocks and even ore materials of various sources,strongly oxidized ore-forming fluids with a long and repeated active history and stable geothermal heat current.The factor which decides the reworking intensity is the network consisting of structures of different classes. 相似文献
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This paper presents the changes of crust thickness and Poissons ratios distribution in the Binchuan region,where the first air-gun transmitting station and its a small dense array were deployed.From September 2011 to January 2014,more than 239 teleseismic events of M≥6.0 were recorded in 16 stations in the Binchuan region.Their P-wave receiver functions were analyzed respectively.The high spatial resolution result shows that the average crust thickness of Binchuan region is 45.3km,it follows the rule of"deeper in the north and east part,shallower in the south and west part."The deepest region is in Xiaoyindian Station;the crust thickness is 47.9km;the shallowest region is in Paiying Station,it has the thickness of 42.1km.It shows that the deeper Moho surface nearby the Chenghai fault and shallower nearby the Honghe fault;the isoline distribution of thickness changes greatly nearby the Chenghai fault and slowly nearby the Honghe fault.From the distribution of Poissons ratios,it is unevenly in the study area with a great difference from the north part to the south part,which shows a characteristic of"lower in the north,higher in the south".The Poissons ratio nearby the Honghe fault is medium too high(0.26≤σ≤0.29);lower nearby the Chenghai fault(σ≤0.26).This paper concludes the possible reason of different characteristic between Poissons ratio and crust thickness is thicker in the upper crust in the Binchuan region. 相似文献
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Early diagnosis of colorectal cancer (CRC) is important for improving the survival rate of the disease. Disparities in CRC diagnosis among different population groups have persisted in the United States. This study examines whether spatial access to medical services contributes to disparities of late-stage diagnosis of CRC in Texas. Analysis results suggest that there are significant disparities in late-stage CRC diagnosis by race/ethnicity, socioeconomic status, and geographic location in Texas. It is concluded that spatial access to primary care is associated with CRC stage at diagnosis, but not with racial/ethnic and socioeconomic disparities. 相似文献
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Paleosol (fossilized soil) geochemistry can provide a record of paleoclimatic conditions due to the relationships between pedogenic processes and climate. In this study, paleosols from the late Paleocene Goler Formation of Southern California were used to determine the paleoclimatic conditions active during pedogenesis. The enrichment and retention of soluble elements (Ca, Mg and Na) and the mobilization of Fe and Mn within the paleosol profiles suggest a climate with strongly seasonal precipitation. Similarly, variations in the Mn content and δ13C ratio of pedogenic carbonate nodules also reflect seasonal precipitation. Regional paleotopography was likely an important control on the paleoclimate of the Goler Formation due to rain shadow effects. Although the size and location of these ancient mountains are poorly constrained, the identification of climatic effects specifically associated with these variables provides new constraints. 相似文献
18.
玉龙斑岩铜矿带莽总含矿斑岩体岩石学特征及锆石U-Pb年龄研究 总被引:4,自引:1,他引:3
莽总斑岩铜钼矿床位于玉龙斑岩铜矿带中部,含矿岩体侵入下二叠统和上三叠统火山岩和硅质沉积岩中.含矿岩体出露面积约0.27km2,普遍发生蚀变,可分为早晚两个阶段.本文分析了含矿岩体化学组成及用锆石LA-ICP-MS U-Pb 年龄分析斑岩体形成时代.早阶段岩体主要为花岗闪长斑岩,晚阶段岩体为石英二长斑岩及碱长花岗斑岩,晚... 相似文献
19.
文中设计了一个二维完全弹性的积云团数值模式 .模式中考虑了水平均一和时间定常的大尺度抬升速度的影响 .大度抬升速度只对热力学方程和水汽守恒方程有影响 .积云团的启动方式采用冷池和随机扰动相结合的方法 .文中对一个给定温湿层结和大尺度抬升速度情况下 ,就不同扰动结构、水平环境切变、模式区域大小和冷池强度等进行了 1 1个模拟试验 .结果表明 ,在不同扰动结构、是否有水平环境风切变、模式区域不同以及不同云型谱时 ,给定温湿层结和大尺度抬升速度下的积云团活动使得温湿层结向着同一温湿层结调整 .这说明大气由于积云团活动达到准平衡状态 ,这个准平衡状态主要依赖于初始温湿层结和大尺度抬升速度 .这与 Betts积云参数化方案的假设相一致 . 相似文献
20.
大气污染物SOx输送方程的尺度分析 总被引:5,自引:1,他引:5
文中用量纲分析方法分析了控制大气污染物输送方程的动力学特性。提出了 6种反映大气污染物输送过程中各种动力、物理和化学过程相对重要性的动力学参数。并以硫氧化物为例进行了各参数量级大小分析 ,尤其对 3种起汇作用 (去除机理 )的机理 (化学转化、干沉降和湿清除 )在不同尺度大气污染过程中的作用进行了详细分析。结果表明 :在一般情况下 ,SO2 的气相化学作用小于干沉降和湿清除的作用 ;干沉降作用很依赖于模式最底层厚度的选取 ;在有降雨时湿清除作用一般较大。文中还对大气污染物SOx 输送方程各项特征量的量级作了分析对比 ,得出了控制不同尺度大气污染物输送过程的零级近似方程和一级近似方程 ,并指出了这些方程的基本特征 相似文献