Birger Rasmussen , Janet Muhling , I. Fletcher, Michael Wingate. In situ SHRIMP U-Pb dating of monazite integrated with petrology and textures: Does bulk composition control whether monazite forms in low-Ca pelitic rocks during amphibolite facies metamorphism. N2 – Bulk composition and specific reaction history among common silicate minerals have been proposed as controls on monazite growth in metapelitic rocks during amphibolite facies metamorphism. It has also been implied that monazite that formed during greenschist facies metamorphism may be preserved unchanged under upper amphibolite facies conditions. If correct, this would make the interpretation of monazite ages in polymetamorphic rocks exceedingly difficult, because isotopic dates could vary significantly in rocks that have experienced identical metamorphic conditions but differ only slightly in whole-rock composition. Low-Ca pelitic schists from the Mount Barren Group in southwestern Australia display a range of whole-rock compositions in AFM space and different peak mineral assemblages resulting from amphibolite facies metamorphism similar to 8 kb, degrees C.

Iraqi National Journal of Earth Sciences

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SHRIMP U-Pb dating of the preeruption growth history of zircons from the ka Whakamaru Ignimbrite, New Zealand: Evidence for > k.y.

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Arafura Basin. Bremer Sub-basin study. Nitrogen in estuaries. Diatoms and water quality. Geochronology boost.

SHRIMP zircon U-Pb dating and its significance for gneisses from the southwest area to Qinghe County in the Altai, China. Acta Petrologica Sinica 22 (1)

Jelinek I ; Artur C. Bastos-Neto I ; Jayme A. McNaughton III. These ages were obtained by U-Pb isotopic determinations with the sensitive high mass-resolution ion microprobe on igneous zircons from Pedras Grandes Suite in Santa Catarina State. Euhedral zircons remained unaltered close to a fluorite vein deposited at ? C or more. These ages suggest a northern limit for the Pedras Grandes Suite, explaining the spatial relationship between the fluorite veins and the source rock.

Its major significance for crustal building motivated this geochronological investigation.

Rutile U-Pb Geochronology

The state Senate canceled session Wednesday after Sen. Brian Jones R-Santee tested positive for virus. Jones is under quarantine along with Republican lawmakers he had personal contact with. San Diego Unified will offer in-person learning to students with learning loss, special needs. As many as 12, students could qualify for the optional, appointment-based sessions, which could start late September. Now use is climbing again.

Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Show full item record. Last updated: 20 May Giles, D. Nutman, A. Australian Journal of Earth Sciences, ; 50 3 Also reported are ages from a middle amphibolite-facies metasediment from the Soldiers Cap Group approximately 90 km north of Cannington. The predominantly metasedimentary host rocks of the Cannington deposit were eroded from a terrane containing latest Archaean to earliest Palaeoproterozoic ca Ma and Palaeoproterozoic ca Ma zircon.

The ca Ma group of zircons are consistent with sedimentary provenance from rocks of Cover Sequence 2 age that are now exposed to the north and west of the Cannington deposit. The metasedimentary samples also include a group of zircon grains at ca Ma, which we interpret as the maximum depositional age of the sedimentary protolith. This is comparable to the maximum depositional age of the metasediment from the Maronan area ca Ma and to previously published data from the Soldiers Cap Group.

Metamorphic zircon rims and new zircon grains grew at Ma during upper amphibolite-facies metamorphism in metasedimentary and mafic magmatic rocks.

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Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Wang and C. Li and L. Metabasites consisting of metamorphic ultra-mafic rocks, cumulate gabbro, gabbro diabase , basalt, and plagiogranite are exposed at the Taoxinghu area in central Qiangtang, northern Tibetan Plateau. View on Springer. Save to Library. Create Alert.

Launch Research Feed. Share This Paper. U-Pb zircon dating of Early Paleozoic gabbro from the Nantinghe ophiolite in the Changning-Menglian suture zone and its geological implication. Wang, L.

Sensitive high-resolution ion microprobe

Zircon dating shrimp This paper. Figure 2. Figure 2 comparison of 3.

Zircon SHRIMP U-Pb Dating and Geochemical Characteristics of Late Variscan Granites of the Daitongshan Copper Deposit and Lamahanshan.

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Uranium-lead dating

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