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聊古一井数字化氡与模拟水氡观测资料的对比评价 总被引：9，自引：0，他引：9
数字化氡在聊古一井投入观测已近4年, 与模拟水氡观测相比, 具有采样率高, 数字传输、保存和资料处理快捷方便, 人为观测误差少的优点, 从而使氡的信息量大大增加, 为捕捉地震短临异常信息提供了有利条件。对数字化氡与模拟水氡同期观测资料的对比分析结果表明, 二者的变化趋势、方差及均值变化均不一致, 数字化氡与模拟水氡观测的物理含义不同,是一种新的测项, 尚不能完全替代原有的模拟水氡观测; 数字化氡在反映地震短临异常方面优于模拟水氡; 气水分离装置(脱气装置)是实现氡数字化观测的重要基础环节, 对于获取真实可靠的观测结果具有重要作用。 相似文献
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Francini-Filho RB Moura RL Thompson FL Reis RM Kaufman L Kikuchi RK Leão ZM 《Marine pollution bulletin》2008,56(5):1008-1014
Although reef corals worldwide have sustained epizootics in recent years, no coral diseases have been observed in the southwestern Atlantic Ocean until now. Here we present an overview of the main types of diseases and their incidence in the largest and richest coral reefs in the South Atlantic (Abrolhos Bank, eastern Brazil). Qualitative observations since the 1980s and regular monitoring since 2001 indicate that coral diseases intensified only recently (2005–2007). Based on estimates of disease prevalence and progression rate, as well as on the growth rate of a major reef-building coral species (the Brazilian-endemic Mussismilia braziliensis), we predict that eastern Brazilian reefs will suffer a massive coral cover decline in the next 50 years, and that M. braziliensis will be nearly extinct in less than a century if the current rate of mortality due to disease is not reversed. 相似文献
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研究分析了井水位变化与含水层应力应变之间的定量关系,给出了利用承压井水位变化反演含水层应力变化的新方法。利用唐山地震前后井水位变化资料,反演了地震前后大区域应力场的动态调整变化,形成了时间与空间的演化图象,分析了唐山地震前后大区域应力场的动态调整变化特征。 相似文献
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In the vicinity of Konya （Turkey）,mafic,micro-porphyritic sub-volcanic rocks intrude into the Mesozoic units,which represents the only example of such a rock type in the region.40Ar/39Ar dating of two whole rock samples from the sub-volcanics gave ages of 13.72±0.13 and 12.40±0.11 Ma,suggesting temporal association to the Late Miocene-Pliocene high-K calc-alkaline volcanism in the region.The mineral chemistry and geochemical data permit us to classify the rocks as ＂minette＂ lamprophyres.They include diopside and phlogopite phenocrysts in a microcrystalline groundmass composed of sanidine,phlogopite,diopside and titano-magnetite.Segregation and ocelli-like globular structures occur commonly in the samples.In terms of major elements,the lamprophyres are calcalkaline,and potassic to ultrapotassic rocks.All the lamprophyres display strong enrichments in LILE （Rb,Ba,K,Sr）,radiogenic elements （Th,U） and LREE （La,Ce） and prominent negative Nb,Ta,and Ti anomalies on primordial mantle-normalized trace element diagrams.Geochemical data suggest that the lamprophyres and high-K calc-alkaline rocks in the region derived from a subduction-modified lithospheric mantle source affected by different metasomatic events.Lamprophyric magmatism sourced phlogopite-bearing veins generated by sediment-related metasomatism via subduction,but high-K calc-alkaline magmas are possibly derived from a mantle source affected by fluid-rich metasomatism. 相似文献