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

Geochemical reconnaissance of late Proterozoic volcanic and mafic plutonic rocks of the Al'Awshaziyah Quadrangle and related rocks in the Qufar Quadrangle, Northern Arabian Shield

“…A different interpretation of the evolution of the shield postulates alternating rifting and compression without subduction (Kemp and others, 1982). Recent lead-isotope studies (Stacey and Stoeser, 1983) confirm that most of the western shield, correlated with island-arc terranes of Halaban and older age and including the present study area, is derived from oceanic crust and mantle. An oceanic-crustal source was independently postulated by Dodge and others (1979) for rocks of the Halaban group (Juqjuq and Arfan formations) in the Bi'r Juqjuq quadrangle (Hadley, 1976) in the southeastern part of the shield on the basis of geochemical and Sr-isotope data.…”

“…A growing body of published data on the petrology, geochemistry, and geochronology of the Arabian Shield has been accumulating over the past decade (Jackaman, 1972;Dodge and others, 1979;Fleck and others, 1980;Duyverman and others, 1982;Roobol and others, 1983;Darbyshire and others, 1983;Stacey and Stoeser, 1983;Stoeser and others, 1984;Stuckless and others, 1982 and in press). Most of the data and related interpretations are from the southern and central part of the shield, whereas relatively little detailed petrologic and geochemical work has been done thus far on Proterozoic volcanic rocks of the northeastern shield.…”

Geology and regional setting of the Al Masane ancient mine area, southeastern Arabian Shield, Kingdom of Saudi Arabia

“…Lead (Stacey and Stoeser, 1983) from rocks and ores of the Al Amar region of the Arabian Shield has an apparent continental contribution, and single samples from Najran, Saudi Arabia, and Aswan, Egypt are of similar character. In total, the evidence of recent years is compelling that no continental crust existed beneath the oceanic volcanic rocks of most of the shield (Gass, 1981;Stacey and Stoeser, 1983).…”

“…In total, the evidence of recent years is compelling that no continental crust existed beneath the oceanic volcanic rocks of most of the shield (Gass, 1981;Stacey and Stoeser, 1983).…”

Stratigraphy of the late Proterozoic Murdama Group, Saudi Arabia

“…These rocks were believed by Delfour (1979Delfour ( , 1980 to be Middle Proterozoic or older in age, but north of I at 23 o they have recently been shown to be mostly 690 to 650 Ma , and they might well be of similar age further south. However, isotopic data (Stacey and Stoeser, 1983;Stoeser and others, 1984) suggest a component of older continental crust in this block.…”