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The 1723 AD violent Strombolian and phreatomagatic eruption at Irazu volcano (Costa Rica)
No full textThe largest of the recorded historic eruptions at Irazú volcano began on February 16, 1723 and lasted
until at least December 11. We here critically examine deposits of this eruption exposed on the summit of Irazú. Our
reconstruction of the eruption is based on the unique chronicle of the Spanish governor Diego de la Haya. The eruption
began with a < 10 cm thick surge deposit of phreatic origin showing block sag structures. The deposit is overlain by
6 m-thick coarse-grained basaltic andesitic non-graded juvenile fallout tephra consisting of highly vesicular (22-59
vol.%) bombs and lapilli with minor hydrothermally altered lapilli (1-7 vol.%) and rare light colored andesitic vesicular
lapilli (< 1%). These fallout deposits are interpreted as strombolian, possible generated during a short-lived scoria cone
at the end of February 1723, dominate volumetrically in the proximal facies. Overlying <1.2 m thick phreatomagmatic
deposits of fi nely laminated lapilli-bearing gray ash (fallout and surge deposits) some with contorted bedding and sag
structures, are in turn overlain by a 1.2 m thick bed of ash matrix-rich bomb/block deposit. The 1723 eruption was
accompanied by shallow volcano-tectonic earthquakes (Modifi ed Mercalli scale Intensity MMI VI-VII, magnitude ML
~5.5) that possibly facilitated magma/water interaction. Phenocrysts in the basaltic andesite (~53-55 wt.% SiO2) bombs
comprise plagioclase (6.1-21.6 vol.%, An52-35), clinopyroxene (2.5-10 vol.%), orthopyroxene (0.7-2 vol.%), olivine
(0.1-2.2 vol.%; Fo76-88) and Fe/Ti-oxides (0.1-1%), in a groundmass (66.5-90.3 vol. %), dominated by plagioclase
(An69-54), clinopyroxene and opaques in brown and black glass with the same range of chemical composition (SiO2=
57-64 wt.%). Rare white pumiceous lapilli in the scoria deposits are high-K, hornblende andesite (SiO2: 58-60 wt.%),
geochemically unrelated to the scoria deposits. Thus, two different magmas co-existing in the magma chamber were
mingled shortly before, and during, the eruption, suggesting that the eruption was triggered by magma mingling between
hornblende andesite and basaltic andesite magma
Arrêt du conseil d'Etat qui condamne les religieux Bernardins de l'abbaye de Clairvaux en 500 livres d'amende et en 3000 livres de dommages intérêts, pour avoir fabriqué des eaux-de-vie sans déclaration et refusé les visites et exercices des commis aux aides
No full text[Acte. 1723-04-05. Versailles
Gewandt Cammer Mannuale, 1718-1723
No full textGEWANDT CAMMER MANNUALE, 1718-1723
Gewandt Cammer Mannuale, 1718-1723 ( -
Suits of the most celebrated lessons, collected and, fitted to the harpsichord or spinnet by Mr W. Babell, with variety of passages by the author
No full textTitre uniforme : Babell, William (1690?-1723). Compositeur. [Suits of the most celebrated lessons. Clavecin ou épinette]Appartient à l’ensemble documentaire : RISMImpClavecin, Musique de -- +* 1700......- 1799......+:18e siècle
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
IX A 1 - Alte Stadtrechnungen (1722 - 1723)
No full textIX A 1 - ALTE STADTRECHNUNGEN (1722 - 1723)
IX A 1 - Alte Stadtrechnungen (1722 - 1723) ( -
IX A 1 - Alte Stadtrechnungen (1723 - 1724)
No full textIX A 1 - ALTE STADTRECHNUNGEN (1723 - 1724)
IX A 1 - Alte Stadtrechnungen (1723 - 1724) ( -
IX A 1 - Alte Stadtrechnungen (1723 - 1724)
No full textIX A 1 - ALTE STADTRECHNUNGEN (1723 - 1724)
IX A 1 - Alte Stadtrechnungen (1723 - 1724) ( -
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