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U-Pb geochronology of Archean magmatism and basement reactivation in the Carajás area, Amazon shield, Brazil

Autor: N. Machado, T.E. Krogh, Z. Lindenmayer, D. Lindenmayer

Publikováno v: Precambrian Research. 49:329-354

The Archean Carajas Subprovince is a metallogenic district (BIF, bauxite, Cu, Ni, Mn, Au) located in the easternmost Amazonian Craton in Brazil. The main conclusions from a U-Pb study of the Itacaiunas Supergroup and a locality in the Xingu Complex a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b392a0f160ea5407f1856801f18d9f45
https://doi.org/10.1016/0301-9268(91)90040-h

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Age of detrital zircon and titanite in the Meguma Group, southern Nova Scotia, Canada: Clues to the origin of the Meguma Terrane

Autor: J.D. Keppie, T.E. Krogh

Publikováno v: Tectonophysics. 177:307-323

Precise U-Pb isotopic analysis of seventeen selected high-quality laboratory abraded zircon single grains, seven multigrain fractions of similar material and four paramagnetic titanite fractions record the ages of the various detrital grain types fro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::538960c25ad5d983edddf0f79ea0d38c
https://doi.org/10.1016/0040-1951(90)90287-i

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Coesite Micro-Inclusions and the U-Pb Age of Zircons from the Hareidland Eclogite in the Western Gneiss Region of Norway

Autor: Patrick J. O'Brien, D. A. Carswell, T.E Krogh, R.D. Tucker

We have identified by laser micro-Raman spectroscopy that inclusions of coesite occur together with other eclogite-facies mineral phases within metamorphic zircons separated from the large eclogite body at Ulsteinvik–Dimnoy on Hareidland. This is t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::38b5620af901d6e48ea628f3919db0d6
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/16034

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Evidence of multiple intrusion, possible resetting of U-Pb ages, and new crystallization of zircons in the post-tectonic intrusions (‘Rapakivi granites’) and gneisses from South Greenland

Autor: Brian L. Gulson, T.E Krogh

Publikováno v: Geochimica et Cosmochimica Acta. 39:65-82

U-Pb data for zircons from post-tectonic monzonite, syenite and norite, and country rock gneiss and migmatite from the Kap Farvel-Prins Christian Sund area of South Greenland indicate two distinct intrusive episodes at ∼1740 m.y. and ∼1755 m.y. T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a2963e3c4dcddeda9d1dc3d444161152
https://doi.org/10.1016/0016-7037(75)90185-4

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U/Pb zircon studies on the age and origin of post-tectonic intrusions from South Greenland

Autor: B.L Gulson, T.E Krogh

Publikováno v: Rapport Grønlands Geologiske Undersøgelse. 45:48-53

The samples used in the age dating programme reported on here were collected in the summer of 1970 as part of a regional mapping programme with J. R. Andrews, D. Bridgwater, B. L. Gulson and J. S.Watterson (see Andrews et al., 1971). Owing to the ext

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::11d7106829f47d42728fbcb85bb2f456
https://doi.org/10.34194/rapggu.v45.7300

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Ancient and modern volcanic rocks: A trace element model

Autor: Stanley R. Hart, David F. Nava, T.E. Krogh, C. Brooks, G. L. Davis

Publikováno v: Earth and Planetary Science Letters. 10:17-28

In terms of the relative abundance of K, Rb, Cs, Sr and Ba, modern oceanic and island-arc basalts may be viewed as a gradational family ranging from alkali basalt (enriched in these elements) to low-K-tholeiite, such as ocean-floor basalt (depleted i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6f3fa1949fd77b02b9d25146fb7749e8
https://doi.org/10.1016/0012-821x(70)90060-9

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Carbonate contents and87Sr/86Sr ratios of calcites from Archaean meta-volcanics

Autor: Stanley R. Hart, G. L. Davis, C. Brooks, T.E. Krogh

Publikováno v: Earth and Planetary Science Letters. 6:35-38

Of 67 Archaean greenstones investigated, 79% contained less than 3% calcite and 52% less than 1% calcite. Initial 87 Sr/ 86 Sr analyses of 14 calcites taken from these rocks indicate that the modification of the greenstone total rock 87 Sr/ 86 Sr by

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8e89e2979a78683cf3f74f27ad718e62
https://doi.org/10.1016/0012-821x(69)90157-5

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