Výsledky vyhledávání - "John S. Stacey"

Age and Nature of the Basement in Northeastern Washington and Northern Idaho: Isotopic Evidence from Mesozoic and Cenozoic Granitoids

Autor: Martin J. Whitehouse, Fred K. Miller, John S. Stacey

Publikováno v: The Journal of Geology. 100:691-701

K-feldspar Pb and whole rock Nd isotopic analyses from 25 Mesozoic and Cenozoic plutonic rocks and two gneisses from NE Washington and northern Idaho are used to elucidate the age and nature of the concealed cratonic basement. The plutons form two hi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d1c0bec3b97a33cef29faeace618252a
https://doi.org/10.1086/629622

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Late Cretaceous and early Tertiary plutonism and deformation in the Skagit Gneiss Complex, North Cascade Range, Washington and British Columbia

Autor: Robert E. Zartman, John S. Stacey, Peter Van Der Heyden, Ralph A. Haugerud, R.W. Tabor

Publikováno v: Geological Society of America Bulletin. 103:1297-1307

The Skagit Gneiss Complex forms a more-or-less continuous terrane within the northern, more deeply eroded part of the North Cascade Range. The complex comprises abundant plutons intruded at mid-crustal depths into a variety of metamorphosed supracrus

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e6596d3db5d67e8f456f805b40cf28e6
https://doi.org/10.1130/0016-7606(1991)103<1297:lcaetp>2.3.co

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A lead isotope study of mineralization in the Saudi Arabian Shield

Autor: John S. Stacey, Ralph Jackson Roberts, J. W. Gramlich, Maryse H. Delevaux, Bruce R. Doe

Publikováno v: Contributions to Mineralogy and Petrology. 74:175-188

New lead isotope data are presented for some late Precambrian and early Paleozoic vein and massive sulfide deposits in the Arabian Shield. Using the Stacey Kramers (1975) model for lead isotope evolution, isochron model ages range between 720 m.y. an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e2f6a693f3e2d6590b39fec42ff79b01
https://doi.org/10.1007/bf01132003

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An evaluation of the zircon method of isotopic dating in the Southern Arabian Craton

Autor: Robert J. Fleck, D. G. Stoeser, J. A. Cooper, John S. Stacey

Publikováno v: Contributions to Mineralogy and Petrology. 68:429-439

A zircon study has been made on eleven samples of igneous rocks from the Saudi Arabian Craton. Ages of sized and magnetic fractions of zircon concentrates show variable degrees of discordance which seem to result from a very young disturbance that pr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dad4613e1243aa0601cc9025920f7951
https://doi.org/10.1007/bf01164527

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U-Pb Isotopic evidence for the accretion of a continental microplate in the Zalm region of the Saudi Arabian Shield

Autor: John S. Stacey, Robert A. Agar

Publikováno v: Journal of the Geological Society. 142:1189-1203

The area covered by this work includes three of the main tectonic units of the Arabian Shield: the Afif continental terrain, the Nabitah suture with its associated mobile belt, and the Asir ensimatic arc terrain. The geology of the Zalm area is well

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d33d62881ca5b4f0c9234605eaf19b43
https://doi.org/10.1144/gsjgs.142.6.1189

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Precambrian ophiolites of arabia: geologic settings, UPb geochronology, Pb-isotope characteristics, and implications for continental accretion

Autor: Wayne R. Premo, Lynn B. Fischer, John S. Stacey, John S. Pallister

Publikováno v: Precambrian Research. 38:1-54

Disrupted ophiolites occur in linear belts up to 900 km long between microplates that collided during the late Proterozoic to form the Arabian Shield. UPb zircon ages and Pb-isotope data from these ophiolitic rocks help constrain the history of ac

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::726cbc1f3987ed703d5a3c47bdc7458d
https://doi.org/10.1016/0301-9268(88)90092-7

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Distribution of oceanic and continental leads in the Arabian-Nubian Shield

Autor: John S. Stacey, Douglas B. Stoeser

Publikováno v: Contributions to Mineralogy and Petrology. 84:91-105

New common lead data for feldspar, whole-rock, and galena samples from the Arabian-Nubian Shield, together with data from previous work, can be divided into two main groups. Group I leads have oceanic (mantle) characteristics, whereas group II leads

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7846bff4f8c1db5902cd2a4074135dd5
https://doi.org/10.1007/bf01132334

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Lead isotopes and mineralization ages in Belt supergroup rocks, northwestern Montana and northern Idaho

Autor: Robert E. Zartman, John S. Stacey

Publikováno v: Economic Geology. 66:849-860

Lead isotopes are used to distinguish between Precambrian mineralization and Mesozoic or Cenozoic mineralization in an area of Belt Supergroup rocks in northwestern Montana and northern Idaho. The Precambrian lead is characterized by a comparatively

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b95ad6c92015143b10b44164b88c9c90
https://doi.org/10.2113/gsecongeo.66.6.849

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