Glassy orthopyroxene granodiorites of the Pannonian Basin: tracers of ultra-high-temperature deep-crustal anatexis triggered by Tertiary basaltic volcanism     

Monika?HuraiováEmail author  Jean?Dubessy  Patrik?Kone?ny  Klaus?Simon  Ján?Král’  Grzegorz?Zielinski  Jozef?Lipka  Vratislav?Hurai 《Contributions to Mineralogy and Petrology》2005,148(5):615-633

Glassy orthopyroxene granodiorite-tonalite (named pincinite after type locality) was described from basaltic lapilli tuffs of the Pliocene maar near Pinciná village in the Slovakian part of the Pannonian Basin. Two pincinite types exhibit a qualitatively similar mineral composition (quartz, An_20–55 plagioclase, intergranular silicic glass with orthopyroxene and ilmenite, ±K-feldspar), but strongly different redox potential and formation PT conditions. Peraluminous pincinite is reduced (6–7% of total iron as Fe³⁺ in corundum-normative intergranular dacitic glass) and contains ilmenite with 8–10 mol% Fe₂O₃ and orthopyroxene dominated by ferrosilite. High-density (up to 0.85 g/cm³) primary CO₂ inclusions with minor H₂, CH₄, H₂S, CO and N₂ (<2 mol% total) are present in Qtz and Plg. Equilibrium PT conditions inferred from the intergranular Opx–Ilm–Glass assemblage and fluid density correspond to 1,170±50°C, 5.6±0.4 kbar, respectively. Metaluminous pincinite is more oxidised (25–27% of total iron as Fe³⁺ in diopside-normative intergranular glass of rhyolite–trachyte–dacite composition) and contains Fe₂O₃-rich ilmenite (17–29 mol%) associated with enstatite. Fluid inclusions are composed of CO₂–H₂O mixtures with up to 38 mol% H₂O. Raman spectroscopy revealed H₂S along with dominant CO₂ in the carbonic phase. Equilibrium PT parameters for the intergranular Opx–Ilm–Glass assemblage correspond to 740±15°C, 2.8±0.1 kbar, respectively. Reducing gas species (<2 mol% total) in the CO₂-inclusions of the peraluminous pincinite resulted from hydrogen diffusion due to fH₂ gradient imposed during decrease of redox potential from the log fO₂ values near QFM during Qtz + Plg growth, to QFM-2 incidental to the superimposed Opx + Ilm assemblage in the intergranular melt. The decrease in oxygen fugacity was recorded also in the metaluminous pincinite, where log fO₂ values changed from ~QFM + 2.6 to QFM + 0.4, but hydrogen diffusion did not occur. Absence of OH-bearing minerals, major and trace element abundances (e.g. REE 300–320, Nb 55–57, Th 4–31, Zr 240–300 ppm, FeO_tot/MgO up to 11), and Sr–O isotope ratios in the pincinites are diagnostic of high-temperature anorogenic magmas originated by dehydration melting of biotite in quartz-feldspathoid crust (⁸⁷Sr/⁸⁶Sr>0.705–0.706, ¹⁸O>9 V-SMOW) around alkali basalt reservoir in depths between 17 and 20 km, and around late stage derivatives of the basalt fractionation, intruding the crust up to depths of 10–11 km. Low water activity in the pincinite parental melt was caused by CO₂-flux from the Tertiary basaltic reservoirs and intrusions. The anatexis leads to generation of a melt-depleted granulitic crust beneath the Pannonian Basin, and the pincinites are interpreted as equivalents of igneous charnockites and enderbites quenched at temperatures above solidus and unaffected by sub-solidus re-equilibration and metamorphic overprint.  相似文献   

Geochemical discriminations of sandstones from the Mohe Foreland basin,northeastern China: Tectonic setting and provenance   总被引：5，自引：0，他引：5  

Andrey A. Sorokin 《中国科学D辑(英文版)》2005,48(5):613-621

The Mohe region near the border area of China with Russia is in Heilongjiang Province. Topographically the area consists of lower mountains or hills situated at the northern end of the Da Hinggan Mountains. Struc-turally the Mohe basin rests on the north margin of the Ergun Block, and the Mongol-Okhotsk Orogen is lo-cated to the north of the basin. Due to poor access conditions and good vegetation coverage, previous researches on the basin are much weak with few spe-cial geological inves…  相似文献   

Consequences of change and variability in sea ice on marine ecosystem and biogeochemical processes during the 2007–2008 Canadian International Polar Year program     

David G. Barber  Matthew G. Asplin  Tim N. Papakyriakou  Lisa Miller  Brent G. T. Else  John Iacozza  C. J. Mundy  M. Gosslin  Natalie C. Asselin  Steve Ferguson  Jennifer V. Lukovich  Gary A. Stern  Ashley Gaden  Monika Pu?ko  N.-X. Geilfus  Fei Wang 《Climatic change》2012,115(1):135-159

Change and variability in the timing and magnitude of sea ice geophysical and thermodynamic state have consequences on many aspects of the arctic marine system. The changes in both the geophysical and thermodynamic state, and in particular the timing of the development of these states, have consequences throughout the marine system. In this paper we review the ??consequences?? of change in sea ice state on primary productivity, marine mammal habitats, and sea ice as a medium for storage and transport of contaminants and carbon exchange across the ocean-sea-ice-atmosphere interface based upon results from the International Polar Year. Pertinent results include: 1) conditions along ice edges can bring deep nutrient-rich ??pacific?? waters into nutrient-poor surface waters along the arctic coast, affecting local food webs; 2) both sea ice thermodynamic and dynamic processes ultimately affect ringed seal/polar bear habitats by controlling the timing, location and amount of surface deformation required for ringed seal and polar bear preferred habitat 3) the ice edges bordering open waters of flaw leads are areas of high biological production and are observed to be important beluga habitat. 4) exchange of climate-active gases, including CO₂, is extremely active in sea ice environments, and the overall question of whether the Arctic Ocean is (or will be) a source or sink for CO₂ will be dependent on the balance of competing climate-change feedbacks.  相似文献   

影响卢氏县的气象灾害防御措施   总被引：2，自引：1，他引：1  

莫爱勰  马丽征  蔡涛  胡韶华  吕国华  王梅娟 《气象与环境科学》2009,32(Z1)

影响卢氏山区的气象灾害有暴雨、暴雪、寒潮、大风、高温、干旱、雷电、冰雹、大雾、道路积冰等.其中暴雨、冰雹出现频率较高,且危害最大.为防御气象灾害,气象部门应提高灾害性天气预报准确率;政府及有关单位要及时把灾害性天气预报信息通过各种渠道,及时传播至千家万户;加强防灾减灾宣传,提高民众自救能力;建立和完善灾害性天气预警应急预案.  相似文献   

广西右江河谷2008年芒果低温寒害调查分析   总被引：7，自引：1，他引：6  

莫蕤  韦芳  苏春芹  韦金海 《气象研究与应用》2009,30(1):52-54

通过对广西右江河谷四县(区)2008年低温期间气象要素资料、气候特点进行分析统计,结合芒果的生物学特性、物候发育期及农业气象灾害指标,探讨此次低温寒害天气对右江河谷芒果生产的影响,并提出相应的生产防御对策,以达到趋利避害.  相似文献   

普通黑光灯对稻纵卷叶螟和稻飞虱的诱虫量与气象因子的相关分析   总被引：2，自引：0，他引：2  

谭乾开  周荣斌  莫小飞  吴超雄  刘楚忠 《气象研究与应用》2009,30(2):53-55

以1991年至2008年广东省恩平市的观测数据,分析了普通黑光灯对稻纵卷叶螟和稻飞虱诱虫量与气象条件的相关性.结果表明:稻纵卷叶螟蛾年总诱量与年总降雨量呈正相关,稻飞虱成虫年诱量与年降雨量呈负相关,稻纵卷叶螟蛾与主要为害的5、6、8月降雨均呈正相关,与7月降雨则呈负相关;稻飞虱与5、7、8月降雨均为负相关,与6月降雨为正相关.此外,热带气旋个数与稻飞虱年诱虫量呈负相关;与稻纵卷叶螟蛾年诱虫量呈正相关.综合分析表明,稻纵卷叶螟蛾与稻飞虱与气象因子比较有较大的差别,对普通黑光灯诱虫量有极大的影响,可间接预测预报两迁飞性害虫的发生量,为准确预测预报两迁害虫为害提供参考.  相似文献   

Feedback from galactic stellar bulges and hot gaseous haloes of galaxies     

Shikui Tang  Q. Daniel Wang  Yu Lu  H. J. Mo 《Monthly notices of the Royal Astronomical Society》2009,392(1):77-90

  相似文献   

The rise and fall of galaxy activity in dark matter haloes     

Anna Pasquali  Frank C. van den Bosch  H. J. Mo  Xiaohu Yang  Rachel Somerville 《Monthly notices of the Royal Astronomical Society》2009,394(1):38-50

  相似文献   

Transition from radiatively inefficient to cooling dominated phase in two temperature accretion disks around black holes     

Monika Sinha  S. R. Rajesh  Banibrata Mukhopadhyay 《中国天文和天体物理学报》2009,9(12)

  相似文献   

IR calibrations for water determination in olivine,r-GeO<Subscript>2</Subscript>, and SiO<Subscript>2</Subscript> polymorphs     

Sylvia-Monique?ThomasEmail author  Monika?Koch-Müller  Patrick?Reichart  Dieter?Rhede  Rainer?Thomas  Richard?Wirth  Stanislav?Matsyuk 《Physics and Chemistry of Minerals》2009,36(9):489-509

Mineral-specific IR absorption coefficients were calculated for natural and synthetic olivine, SiO₂ polymorphs, and GeO₂ with specific isolated OH point defects using quantitative data from independent techniques such as proton–proton scattering, confocal Raman spectroscopy, and secondary ion mass spectrometry. Moreover, we present a routine to detect OH traces in anisotropic minerals using Raman spectroscopy combined with the “Comparator Technique”. In case of olivine and the SiO₂ system, it turns out that the magnitude of ε for one structure is independent of the type of OH point defect and therewith the peak position (quartz ε = 89,000 ± 15,000  \textl \textmol_{\textH2\textO}^-1 \textcm^-2\text{l}\,\text{mol}_{{\text{H}_2}\text{O}}^{-1}\,\text{cm}^{-2}), but it varies as a function of structure (coesite ε = 214,000 ± 14,000  \textl \textmol_{\textH2\textO}^-1 \textcm^-2\text{l}\,\text{mol}_{{\text{H}_2}\text{O}}^{-1}\,\text{cm}^{-2}; stishovite ε = 485,000 ± 109,000  \textl \textmol_{\textH2\textO}^-1 \textcm^-2\text{l}\,\text{mol}_{{\text{H}_2}\text{O}}^{-1}\,\text{cm}^{-2}). Evaluation of data from this study confirms that not using mineral-specific IR calibrations for the OH quantification in nominally anhydrous minerals leads to inaccurate estimations of OH concentrations, which constitute the basis for modeling the Earth’s deep water cycle.  相似文献