U–Pb single zircon geochronology of granitoids in the Vumba granite–greenstone terrain (NE Botswana):
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The contorted New England Orogen (eastern Australia): New evidence from UPb geochronology of early Permian granitoids
[1] A series of sharp bends (oroclines) are recognized in the Paleozoic to early Mesozoic New England Orogen of eastern Australia. The exact geometry and origin of these bends is obscured by voluminous magmatism and is still debated. Here we present zircon U-Pb ages that confirm the lateral continuation of early Permian (296–288 Ma) granitoids and shed new light on the oroclinal structure. Orog...
متن کاملpetrogenesis of granitoids, u-pb zircon geochronology, sr-nd petrogenesis of granitoids, u-pb zircon geochronology, sr-nd isotopic characteristics, and important occurrence of tertiary mineralization within the lut block, eastern iran
tertiary intrusive granitoids within the lut block in the khorasan razavi and south khorasan provinces are mainly sub-volcanic with porphyry texture and their composition varies from granite to diorite but monzonite is dominant. with the exception of hired, these are classified as belonging to the magnetite-series of i-type granitoids. chemically, these rocks are meta-aluminous. those with mine...
متن کاملu-pb zircon geochronology, sr-nd isotope geochemistry, and petrogenesis of oxidant granitoids at keybarkuh, southwest of khaf
keybarkuh area is located 70 km southwest of khaf, khorasan razavi province. the study area is situated in northeastern lut block. the rock units in the area are paleozoic metamorphic rocks and cretaceous to tertiary subvolcanic intrusions intruded as dike, stock and batholith; their composition varies from granite to diorite. based on magnetic susceptibility, the intrusive rocks are divided in...
متن کاملAn Investigation on the Composition of Biotite from Mashhad Granitoids, NE Iran
Compositions of biotite from three different rock types of Mashhad granitoids, i.e., granodiorite, monzogranite and leucogranite in NE of Iran have been documented by electron microprobe and wet chemistry for Fe3+ and Fe2+. Mashhad granitoids have been geochronologically and petrologically grouped into G1 and G2 phases. Microprobe data show that the total Fe contents in biotite from G2 leucogra...
متن کاملProvenance of Triassic and Jurassic Sandstones in the Banda Arc: Petrography, Heavy Minerals and Zircon Geochronology
Quartz-rich sandstones in the Banda Arc Islands are thought to be equivalent of Mesozoic sandstones on the Australian NW Shelf where they are important proven and potential reservoirs. Previous studies suggested that rivers draining Australia provided most of the sediment input and there have been suggestions of a northern provenance for some Timor sediments. We present results from a provenanc...
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ژورنال
عنوان ژورنال: Precambrian Research
سال: 2002
ISSN: 0301-9268
DOI: 10.1016/s0301-9268(02)00074-8