全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
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作者:I. M. Villa , H. Achyuthan ...
来源:[J].Bulletin of Volcanology(IF 2.653), 2014, Vol.76 (9), pp.1-16Springer
摘要:Abstract(#br)The Youngest Toba Tuff (YTT, erupted at ca. 74 ka) is a distinctive and widespread tephra marker across South and Southeast Asia. The climatic, human and environmental consequences of the YTT eruption are widely debated. Although a considerable body of geochemical da...
作者:M. P. McClenaghan , D. B. Seymour , I. M. Villa
来源:[J].Australian Journal of Earth Sciences(IF 1.468), 1994, Vol.41 (1), pp.47-54Taylor & Francis
摘要:Six radiometric age determinations from minettes in lamprophyre dyke suites from western Tasmania give Late Devonian ages (range: 366-377 Ma; weighted average 373.4±14.1 Ma). In the Point Hibbs area this result tightly constrains the age of a significant period of northwestw...
作者:J. L. Everard , I. M. Villa
来源:[J].Australian Journal of Earth Sciences(IF 1.468), 1994, Vol.41 (3), pp.265-272Taylor & Francis
摘要:The Crown Hill Andesite is one of several shallow subvolcanic hornblende-phyric andesite/dacite intrusions, associated with similar lavas, which intrude both the Yolande River Sequence and Central Volcanic Complex units of the Mt Read Volcanics in the Queenstown area. The ag...
作者:... M. Saitta , R. Santacroce , I. M. Villa
来源:[J].Bulletin Volcanologique(IF 2.653), 1984, Vol.47 (1), pp.125-141Springer
摘要:Abstract(#br)Subsurface geothermal exploration has considerably added to our knowledge of the Latera volcanic complex. A syenitic body is located about 2 km below the present-day surface; K-Ar data point a 0.9 Ma age. The primary magma was a silica-saturated trachyte; unders...
作者:M. Oddone , I. M. Villa
来源:[J].Journal of Radioanalytical and Nuclear Chemistry Articles(IF 1.467), 1986, Vol.99 (1), pp.153-159Springer
摘要:Abstract(#br)Fast neutron irradiation of potassium-bearing minerals produces artificial 39 Ar. Mass spectrometric measurement of the 39 Ar/ 40 Ar ratio allows to calculate a geological age. Stepwise degassing of the sample yields insight into its history. As an example, analysis ...
作者:F. v. Blanckenburg , I. M. Villa
来源:[J].Contributions to Mineralogy and Petrology(IF 3.476), 1988, Vol.100 (1), pp.1-11Springer
摘要:Abstract(#br)22 hornblende K-Ar ages and 10 39 Ar- 40 Ar spectra were obtained for hornblende garbenschists from the Western Tauern Window. The post-kinematic amphiboles were produced during the late Alpine prograde metamorphism (6–10 kb and 500–570° C). Two nearly pota...
作者:I. M. Villa , H. Baur ...
来源:[J].Contributions to Mineralogy and Petrology(IF 3.476), 1989, Vol.101 (1), pp.1-11Springer
摘要:Abstract(#br)New Hornblende K-Ar and 39 Ar- 40 Ar and mica Rb-Sr and K-Ar ages are used to place specific timemarks on a well-constrained pressure-temperature path for the late Alpine metamorphism in the Western Tauern Window. After identification of excess 40 Ar, the closur...
作者:... M. Puxeddu , F. Radicati Brozolo , I. M. Villa
来源:[J].Contributions to Mineralogy and Petrology(IF 3.476), 1982, Vol.81 (4), pp.340-349Springer
摘要:Abstract(#br)Rb-Sr and K-Ar ages have been obtained on six biotites, two muscovites and one hornblende from samples of micaschist, gneiss and amphibolite of Lower Paleozoic to Precambrian age at a depth exceeding 2,000 m in basement rocks of the Larderello-Travale geothermal...
作者:I. M. Villa , K. Kyser ...
来源:[J].Terra Nova(IF 2.83), 2010, Vol.22 (3), pp.188-194Wiley
摘要:Terra Nova, 22, 188–194, 2010(#br)Abstract(#br)To discriminate and correlate Neoproterozoic post‐glacial carbonate successions, isotopic stratigraphy has been attempted in recent years. We report here the development of a new, promising discriminant, the 44Ca/...

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