Tectonic significance of Late Neoproterozoic granites from the Tibesti massif in southern Libya inferred from Sr and Nd isotopes and U–Pb zircon data

Autor:	Brent V. Miller, Ismail B. Suayah, Jonathan S. Miller, Tovah M. Bayer, John J.W. Rogers
Rok vydání:	2006
Předmět:	geography geography.geographical_feature_category Pluton Continental crust Geochemistry Geology Crust Massif Tectonics Magmatism Period (geology) Earth-Surface Processes Zircon
Zdroj:	Journal of African Earth Sciences. 44:561-570
ISSN:	1464-343X
DOI:	10.1016/j.jafrearsci.2005.11.020
Popis:	The Neoproterozoic crust of the Tibesti massif was stabilized by magmatism that included subduction-generated batholithic suites and post-orogenic granite plutons. All of the magmatism occurred in a period of about 20 million years centered around 550 Ma, and nearly all of the granites have initial 87 Sr/ 86 Sr ratios of about 0.706. The Wadi Yebigue pluton has U–Pb zircon ages of 563 Ma and 558 Ma on two different phases and e Nd at 550 Ma from −0.5 to −2.2. These isotopic data and the geologic history of the massif suggest that granites in the Tibesti massif developed during and shortly after closure of a short-lived ocean basin that developed by fragmentation of pre-existing continental crust of the Saharan region.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a0047d98d7ea0484cba37f7a6308240f https://doi.org/10.1016/j.jafrearsci.2005.11.020 Zobrazit plný text záznamu Full Text from ScienceDirect