Long term low latitude and high elevation cosmogenic 3He production rate inferred from a 107 ka-old lava flow in northern Chile; 22°S-3400 m a.s.l

Available geological calibration sites used to estimate the rate at which cosmogenic 3He is produced at the Earth’s surface are mostly clustered in medium to high latitudes. Moreover, most of them have exposure histories shorter than tens of thousands of years. This lack of sites prevents a qualitative assessment of available production models used to convert cosmogenic 3He concentrations into exposure ages and/or denudation rates. It thus limits our ability to take into account the atmospheric, geomagnetic and solar modulation conditions that might have affected the production of cosmogenic nuclides in the past for longer exposure histories and in low latitude regions. We present the cosmogenic 3He production rate inferred from a new geological calibration site located in northern Chile. Five samples were collected on the surface of the largest and best-preserved lava flow of the San Pedro volcano (21.934°S-68.510°W- 3390 m a.s.l), which displays pristine crease-structure features. 40Ar/39Ar dating yield a reliable plateau age of 107±12 ka for the eruption of this lava flow. Eight pyroxene aliquots separated from the surface samples yield a weighted average cosmogenic 3He concentration of 99.3±1.2 Mat.g-1 from which a local cosmogenic 3He production rate of 928±101 at.g-1.yr-1 is calculated. The local production rate is then scaled to a sea level high latitude (SLHL) reference position using different combinations of geographic spatialization schemes, atmosphere models and geomagnetic field reconstructions, yielding SLHL production rates between 103±11 and 130±14 at.g-1.yr-1 consistent with the most recent estimates available from the literature. Finally, we use the same scaling frameworks to re-evaluate the mean global-scale cosmogenic 3He production rate in olivine and pyroxene minerals at 120±16 at.g-1.yr-1 from the compilation of previously published calibration datasets.

County Armàgh, Northern Ireland, United Kingdom, 1760 (Image 1 of 4) (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: A topographical map of the county of Armagh to which is anex'd the plans of Newry and Armagh, by John Rocque = Carte topographique de la Province d'Armagh où se trouve les plans des villes d'Armagh et de Newry, par Jean Rocque. It was published by J. Rocque in 1760. Scale [ca. 1:41,000]. This layer is image 1 of 4 total images of the four sheet source map, representing the southeast portion of the map. Covers County Armàgh, Northern Ireland. Map in English and French. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Irish Grid (Transverse Mercator 1965 (TM-65)) coordinate system. 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, index maps, legends, or other information associated with the principal map. This map shows features such as roads, drainage, built-up areas and selected buildings, selected names of landowners, ground cover, and more. Relief shown by hachures and pictorially. Includes 2 insets: "A Plan of the Town of Newry" -- "A Plan of the City of Armagh".This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

County Armàgh, Northern Ireland, United Kingdom, 1760 (Image 2 of 4) (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: A topographical map of the county of Armagh to which is anex'd the plans of Newry and Armagh, by John Rocque = Carte topographique de la Province d'Armagh où se trouve les plans des villes d'Armagh et de Newry, par Jean Rocque. It was published by J. Rocque in 1760. Scale [ca. 1:41,000]. This layer is image 2 of 4 total images of the four sheet source map, representing the northeast portion of the map. Covers County Armàgh, Northern Ireland. Map in English and French. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Irish Grid (Transverse Mercator 1965 (TM-65)) coordinate system. 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, index maps, legends, or other information associated with the principal map. This map shows features such as roads, drainage, built-up areas and selected buildings, selected names of landowners, ground cover, and more. Relief shown by hachures and pictorially. Includes 2 insets: "A Plan of the Town of Newry" -- "A Plan of the City of Armagh".This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

County Armàgh, Northern Ireland, United Kingdom, 1760 (Image 3 of 4) (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: A topographical map of the county of Armagh to which is anex'd the plans of Newry and Armagh, by John Rocque = Carte topographique de la Province d'Armagh où se trouve les plans des villes d'Armagh et de Newry, par Jean Rocque. It was published by J. Rocque in 1760. Scale [ca. 1:41,000]. This layer is image 3 of 4 total images of the four sheet source map, representing the southwest portion of the map. Covers County Armàgh, Northern Ireland. Map in English and French. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Irish Grid (Transverse Mercator 1965 (TM-65)) coordinate system. 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, index maps, legends, or other information associated with the principal map. This map shows features such as roads, drainage, built-up areas and selected buildings, selected names of landowners, ground cover, and more. Relief shown by hachures and pictorially. Includes 2 insets: "A Plan of the Town of Newry" -- "A Plan of the City of Armagh".This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

County Armàgh, Northern Ireland, United Kingdom, 1760 (Image 4 of 4) (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: A topographical map of the county of Armagh to which is anex'd the plans of Newry and Armagh, by John Rocque = Carte topographique de la Province d'Armagh où se trouve les plans des villes d'Armagh et de Newry, par Jean Rocque. It was published by J. Rocque in 1760. Scale [ca. 1:41,000]. This layer is image 4 of 4 total images of the four sheet source map, representing the northwest portion of the map. Covers County Armàgh, Northern Ireland. Map in English and French. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Irish Grid (Transverse Mercator 1965 (TM-65)) coordinate system. 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, index maps, legends, or other information associated with the principal map. This map shows features such as roads, drainage, built-up areas and selected buildings, selected names of landowners, ground cover, and more. Relief shown by hachures and pictorially. Includes 2 insets: "A Plan of the Town of Newry" -- "A Plan of the City of Armagh".This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Ireland and Northern Ireland, 1705 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: A mapp of the kingdom of Ireland : newly corrected & improv'd by actual observations : divided into its provinces, counties, & baronies, and supply'd with many market towns & other places of note omitted in former mapps ... : together with plans of the citys and fortified towns, as allso a short description of the kingdom by Henry Pratt ; to this map is added a large index of the measur'd distances of ev'ry town from Dublin, of the burroughs, barracks, and post towns with many other improuements and emendations ; I. Harris, sculp. It was published by H. Pratt in 1708. Scale [ca. 1:385,000]. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Irish Grid (Transverse Mercator 1965 (TM-65)) coordinate system. 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, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, cities and other human settlements, major roads, territorial and administrative boundaries, shoreline features, and more. Relief shown pictorially. Includes also text, index, 16 ancillary town maps, and inset: The sea coasts of Great Britain and Ireland.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Observation of manganese deposits made during the 1936 transect of C/S Lord Kelvin through the Northern Atlantic Ocean

In May and June 1936 Dr. C. S. Piggot of the Geophysical Laboratory, Carnegie Institution of Washington, took a series of 11 deep-sea cores in the North Atlantic Ocean between the Newfoundland banks and the banks off the Irish coast. These cores were taken from the Western Union Telegraph Co.'s cable ship Lord Kelvin with the explosive type of sounding device which Dr. Piggot designed. All but two of these cores (Nos. 8 and 11) are more than 2.43 meters (8 feet) long, and all contain ample material for study. Of the two short cores, No. 8 was taken from the top of the Faraday Hills, as that part of the mid-Atlantic ridge is known, where the material is closely packed and more sandy and consequently more resistant; No. 11 came from a locality where the apparatus apparently landed on volcanic rock that may be part of a submarine lava flow.

Proceedings of the Royal Irish Academy.

Historical abstracts. Part B. Twentieth century abstracts

The transactions of the Royal Irish Academy

Latest issue consulted: Vol. 29, pt, 19, published in 1892

Northern studies.

Introduction, by Ernest Rhys.--Norwegian poetry since 1814.--Henrik Ibsen. I-II.--The Lofoden Islands.--Runeberg.--The Danish national theater.--Four Danish poets.--Appendix.

The economic aspects of forest destruction in northern Michigan /

Cover title.

Additional information on the Folsom complex; report on the second season's investigations at the Lindenmeier site in northern Colorado (with 12 plates)

Publication 3390.

A catalogue of the Bradshaw collection of Irish books in the University Library, Cambridge.

Mode of access: Internet.

The northern man with southern principles, and the southern man with American principles:

Mode of access: Internet.

Floods and accelerated erosion in northern Utah.

Contribution from Forest Service.