Volcanic rocks from the submarine Vityaz Ridge: their age, chemical and isotopic compositions

Results of geological studies at the submarine Vityaz Ridge carried out during cruises 37 and 41 of R/V Akademik Lavrent'ev in 2005 and 2006 are reported. The studied area is located at an near-island trench of the slope in the central part of the Kuril Island arc. Morphologically it consists of two parts: an inner volcanic arc represented by the Great Kuril Range and an outer arc corresponding to the submarine Vityaz Ridge. Diverse rocks composing the basement and the sedimentary cover of the ridge were recovered by dredging. Based on K-Ar dating and geochemistry, volcanics were divided into Paleocene, Eocene, late Oligocene, and Pliocene-Pleistocene complexes. Each of the complexes reflects a tectonomagmatic stage in the ridge evolution. Geochemical and isotope data on the volcanics indicate contribution of ancient crustal material in the magma source and, correspondingly, formation of this structure on the continental basement. Two-stage model ages (TDM2) vary in a wide range from zero values in mafic rocks to 0.77 Ga in felsic varieties, pointing to presence of Precambrian protolith in the source of the felsic rocks of the Vityaz Ridge. The Pliocene-Pleistocene volcanics are classed with tholeiitic, calc-alkaline, and subalkaline series, which differ in alkali contents and REE fractionation. Values of (La/Sm)_n and (La/Yb)_n ratios vary from 0.74 and 0.84 in the tholeiitic varieties to 1.19 and 1.44 in the calc-alkaline and 2.32 and 3.73 in the subalkaline rocks. All three varieties occur within the same volcanic edifices and formed during differentiation of magmatic melts that were channeled along fault zones from the mantle source slightly enriched in crustal component.

Geochemistry data from the Toupugol volcanogenic complex

A large fragment of a paleovolcano of Silurian to Early Devonian age was discovered in the Voikar volcanic belt suggesting an ensimatic island are as its geodynamic environment. Formationally, the rocks under study are comparable to Pleistocene island arc volcanites and their paleo-analogues. The volcanites of the Toupugol complex underwent strong hydrothermal-metasomatic alteration: propylites, acid metasomatic rocks and quartz-carbonate veins, which must have resulted from hydrothermal-metasomatic alteration of andesitoids. Both volcanites and apovolcanic hydrothermal rocks in Toupugol were found to host noble metal mineralisation. It is found in close association with sulphides, particularly pyrite. Free gold was discovered in all investigated volcanites and hydrothermal rocks and is characterised by low mercury content and an unusual set of microimpurities (Pt, Pd, Cu, Fe, S) suggesting its links to the mantle substrate.

Cartografiar el acontecimiento. Paisajes eventuales

En este trabajo se pretende hacer un acercamiento al estudio del paisaje desde su perspectiva dual, espacial y temporal. Se propone un retorno a la geografía y la defensa del espacio como objeto de estudio al tiempo que se mantiene una lectura temporal, eventual, del paisaje. Se trata de investigar las formas en que al enfrentarse al espacio no dominado se trazan estrategias de dominación y medida. Para ello se han estudiado dos casos de estudio: la Batalla de Berlín durante la Segunda Guerra Mundial y el lago Salton en California. This paper aims to make an approach to the study of landscape from its dual condition in space and time. It proposes a return to the geography and defense as a study space while maintaining a temporal reading, eventually, the landscape. The research focuses on the strategies of domination and plotted as the face space. This has been studied for two case studies: the Battle of Berlin during the Second World War and the Salton lake in California

Annotated almanac, 1775

Almanac containing one laid-in leaf and interleaved pages with entries in John Winthrop's hand. The interleaved pages include entries include brief, nearly daily notes of social engagements and travel by Winthrop during the year the Winthrops were forced to evacuate Cambridge because of the Revolutionary War. The short entries include notes of the Battle of Concord (April 19), a fire in Boston (May 17), the Battle of Bunker Hill (June 17), the choosing of councillors at Concord (June 21), and the notable entries "wth Genl Washington (August 12)" and "All day packg up Apparatus & Library" (June 16). The laid-in leaf contains an account of household purchases made while the Winthrops were living with Nehemiah Abbot Andover from May to June and later in Concord. The laid-in leaf is written on a note beginning "Mr. Winthrop presents his most respectful compliments to the Hon'ble Col. Hancock and to the rest of the Gentlemen Select-men..."

Letters from Condy Raguet,

Four letters containing news of Royalist Army officers, including Vice Roy José de la Serna, arriving in Rio de Janeiro after their defeat at the Battle of Ayacucho. Raguet also writes of the public reaction to Bolívar’s victory.

[Letter from Andrew Eliot to Alexander Hill, Newbury, November-December 1777]

One-page letter providing news about the Revolutionary War, including General John Burgoyne's arrival in Watertown, Mass., rumors of General Howe's army being taken prisoner, the success of General Stark, and the failed Rhode-Island expedition of 1777. Eliot also mentions the role of divine direction in the war.

Fort Sanders, Knoxville, Tennessee,and vicinity, 1863 (Raster Image)

This layer is a georeferenced raster image of the untitled historic paper manuscript map: [Map of Fort Sanders, Knoxville, Tennessee, and vicinity showing troop lines]. It was sketched ca.1863. Scale not given. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Tennessee State Plane Coordinate System (in Meters) (Fipszone 4100). All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, or other information associated with the principal map. This map shows features such as roads, railroads, drainage, troop location, fortifications, batteries, selected points of military interest, and more. Relief shown by hachures. This layer is part of a selection of digitally scanned and georeferenced historic maps of the Civil War from the Harvard Map Collection. Many items from this selection are from a collection of maps deposited by the Military Order of the Loyal Legion of the United States Commandery of the State of Massachusetts (MOLLUS) in the Harvard Map Collection in 1938. These maps typically portray both natural and manmade features, in particular showing places of military importance. The selection represents a range of regions, originators, ground condition dates, scales, and purposes.