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Full-Text Articles in Physical Sciences and Mathematics
Age, Petrogenesis And Metamorphism Of The Syn-Collisional Proven Igneous Complex, West Greenland, Kristine Thrane, J Baker, J Connelly, Allen Phillip Nutman
Age, Petrogenesis And Metamorphism Of The Syn-Collisional Proven Igneous Complex, West Greenland, Kristine Thrane, J Baker, J Connelly, Allen Phillip Nutman
Faculty of Science - Papers (Archive)
The Paleoproterozoic Prøven Igneous Complex (PIC) in West Greenland extends from ca. 72°15′ to 73°10′N, approximately 500 km north of the subduction-related intrusive complex in the core of the +1100 km wide, asymmetric collisional Nagssugtoqidian-Rinkian Orogen. A new U-Pb SHRIMP age for the PIC of 1869±9 Ma indicates that it intruded synchronously with the main collisional phase of the orogen into the passive margin side of the collision. Sm-Nd and Lu-Hf isotopic and A-type geochemical signatures are compatible with its derivation from melted Archean lower crustal material contaminated to varying degrees by pelitic sedimentary rocks of the Karrat Group. The …
Metasedimentary Complexes Of The Tuva-Mongolian Massif: Age, Provenances And Tectonic Position, I K Kozakov, E B Sal'nikova, Allen Phillip Nutman, V P Kovach, A B Kotov, V N Podkovyrov, Yu V Plotkina
Metasedimentary Complexes Of The Tuva-Mongolian Massif: Age, Provenances And Tectonic Position, I K Kozakov, E B Sal'nikova, Allen Phillip Nutman, V P Kovach, A B Kotov, V N Podkovyrov, Yu V Plotkina
Faculty of Science - Papers (Archive)
A complex problem of dating supracrustal rocks is unavoidable by analysis of tectonic position of polymetamorphic amphibolite and granulite complexes. Geochronological dates are necessary to constrain ages of source rocks and accumulation periods of clastic sediments, while isotopic-geochemical parameters open a possibility to estimate model ages of the crust in provenances. Using the ion microprobe SHRIMPTM (Hiroshima, Japan), clastic zircons from metasediments of the Erzin and Moren complexes of the Tuva-Mongolian massif in accretionary collage of Central Asia are dated and the Nd model age of respective rocks are estimated. The U-Th-Pb isotopic data suggest that clastic zircons from supracrustal …