Tectonic significance of Late Neoproterozoic granites from the Tibesti massif in southern Libya inferred from Sr and Nd isotopes and U–Pb zircon data |
| |
| Authors: | Ismail B Suayah Jonathan S Miller Brent V Miller Tovah M Bayer John JW Rogers |
| |
| Institution: | Department of Geological Sciences, University of North Carolina, Chapel Hill, NC 27599–3315, United States |
| |
| Abstract: | 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 87Sr/86Sr 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 εNd 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. |
| |
| Keywords: | Tibesti Neoproterozoic Sr isotopes Nd isotopes Zircon dating Confined orogen |
| 本文献已被 ScienceDirect 等数据库收录！ |
