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Bin Du, Zian Yang, Lifei Yang, Qi Chen, Jiaxuan Zhu, Kangxing Shi, Gao Li, Lei Wang and Jia Lu
Zircon Hf-isotopic mapping can be regarded as a useful tool for evaluating the coupling relationship between lithospheric structure and metallic mineralization. Hence, this method shows important significance for mineral prediction. To explore this poten...
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Alessandra Correale, Vittorio Scribano and Antonio Paonita
Ultramafic magmas (MgO = 18 wt%) are generally thought to be primary mantle melts formed at temperatures in excess of 1600 °C. Volatile contents are expected to be low, and accordingly, high-Mg magmas generally do not yield large explosive eruptions. How...
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Gabriel A. Arcuri and Alan P. Dickin
New whole-rock lead (Pb) isotope analyses are presented in this study for granitoid orthogneisses from the Southwest Grenville Province in Ontario and Western Quebec. These data are used to test the location of a cryptic Archean-Proterozoic suture propos...
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Beatriz Coira, Clara E. Cisterna, Horstpeter H. Ulbrich, Umberto G. Cordani
Pág. 105 - 126
The Las Lozas volcanic sequence, which crops out at northwestern border of the Famatina belt-southeastern
Puna, NW Argentina, is constituted mainly by rhyolites and a lesser volume of basalts and trachytes, and volcanoclastic
deposits. These rocks, previ...
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Kent C. Condie
Zircon age peaks at 2100?1650 and 1200?1000 Ma correlate with craton collisions in the growth of supercontinents Nuna and Rodinia, respectively, with a time interval between collisions mostly <50 Myr (range 0?250 Myr). Collisional orogens are two types: ...
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Peter R. Johnson, Galen P. Halverson, Timothy M. Kusky, Robert J. Stern and Victoria Pease
The Arabian-Nubian Shield (ANS) includes Middle Cryogenian-Ediacaran (790?560 Ma) sedimentary and volcanic terrestrial and shallow-marine successions unconformable on juvenile Cryogenian crust. The oldest were deposited after 780?760 Ma shearing and sutu...
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David A. Foster and Ben D. Goscombe
Convergent plate margins where large turbidite fans with slivers of oceanic basement are accreted to continents represent important sites of continental crustal growth and recycling. Crust accreted in these settings is dominated by an upper layer of recy...
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Ricardo Varela,Miguel A.S. Basei,Carlos A. Cingolani,Oswaldo Siga Jr.,Claudia R. Passarelli
Isotopic data are presented for rocks of the Andean crystalline basement at 40°S, in Neuquén and Río Negro provinces. The methods used were U-Pb in zircon (crystallization ages of plutonic rocks), K-Ar in micas and U-Pb in titanite (metamorphism and cool...
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