Oxygen and hydrogen isotope geochemistry of S- and I-type granitoids: the Cape Granite suite, South Africa

1997 ◽  
Vol 143 (1-2) ◽  
pp. 95-114 ◽  
Author(s):  
Chris Harris ◽  
Kevin Faure ◽  
Roger E. Diamond ◽  
Reyno Scheepers
Keyword(s):  
South Africa ◽  
Hydrogen Isotope ◽  
Isotope Geochemistry ◽  
Granite Suite

scholarly journals Contamination of the Bushveld Complex (South Africa) magmas by basinal brines: Stable isotopes in phlogopite from the UG2 chromitite

Geology ◽  
2021 ◽  
Author(s):  
Haoyang Zhou ◽  
Robert B. Trumbull ◽  
Ilya V. Veksler ◽  
Ilya N. Bindeman ◽  
Johannes Glodny ◽  
...  
Keyword(s):  
South Africa ◽  
Stable Isotopes ◽  
Hydrogen Isotope ◽  
Bushveld Complex ◽  
Isotope Ratios ◽  
Second Step ◽  
Merensky Reef ◽  
Oxygen Isotope Ratios ◽  
Abundant Evidence ◽  
Hydrogen Isotope Ratios

There is abundant evidence for significant H2O in evolved melts from the platinum-rich UG2 chromitite and the Merensky Reef of the Bushveld Complex (South Africa), but there is no consensus about the source of H2O. We report triple-oxygen and hydrogen isotope ratios of interstitial, late-magmatic phlogopite from three localities of the UG2 layer. The phlogopite yielded δD values of –43‰ to –23‰, which is >30‰ higher than previously known from Bushveld rocks and far above the mantle values of ~–75‰. The phlogopite triple-oxygen isotope ratios are the first to be reported for Bushveld rocks, with values of Δ′17O0.5305 (17O excess relative to the reference line 0.5305) from –0.069‰ to –0.044‰ (δ18O 5.2‰–6.2‰). The oxygen data support existing models of as much as 30%–40% contamination of mantlederived magmas in the lower to middle crust. However, the high δ values require a second step of contamination, which we attribute to brines from the marine sediments in the Transvaal Basin at the emplacement level.

Oxygen and Hydrogen Isotope Geochemistry of the Mourne Mountains Tertiary Granites, Northern Ireland

1993 ◽  
Vol 34 (6) ◽  
pp. 1177-1202 ◽  
Author(s):  
A. G. MCCORMICK ◽  
A. E. FALLICK ◽  
R. S. HARMON ◽  
I. G. MEIGHAN ◽  
D. GIBSON
Keyword(s):  
Northern Ireland ◽  
Hydrogen Isotope ◽  
Isotope Geochemistry

scholarly journals Using Hydrogen Isotope Geochemistry to Estimate the Natal Latitudes of Immature Cooper's Hawks Migrating Through the Florida Keys

The Condor ◽  
2001 ◽  
Vol 103 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Timothy D. Meehan ◽  
Casey A. Lott ◽  
Zachary D. Sharp ◽  
Ruth B. Smith ◽  
Robert N. Rosenfield ◽  
...  
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Geochemistry ◽  
Florida Keys ◽  
Accipiter Cooperii ◽  
New Information ◽  
Stable Hydrogen Isotope ◽  
Males And Females ◽  
Hydrogen Isotope Ratios ◽  
The Relationship ◽  
Cooper's Hawks

Abstract We constructed a regression model for the relationship between stable-hydrogen isotope ratios in immature Cooper's Hawk (Accipiter cooperii) feathers (δDf) and precipitation in areas where feathers were grown (δDp) across much of the latitudinal and longitudinal extent of the species' breeding range. We used our model to estimate δDp values from δDf values of immature Cooper's Hawks captured during migration in the Florida Keys. We compared these estimated δDp values to a published map of δDp values of North American precipitation to learn the latitudinal origins of migrants. We reviewed previous migration banding studies to estimate the longitudinal range of migrants. Our analysis suggested that most of the immature Cooper's Hawks migrating through the Keys originated in natal areas in the Mid-Atlantic and Southeast regions of the continent. We found no difference in the passage date of northern and southern birds or in the latitudinal origins of males and females. This new information will aid in the interpretation of population trends generated from the ongoing migration count in the Keys.

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