U-Pb SHRIMP ages recorded in the coesite-bearing zircon domains of paragneisses in the southwestern Sulu terrane, eastern China: New interpretation
-
Fulai Liu
,
Juhn G. Liou
Abstract
Laser Raman spectroscopy and cathodoluminescence (CL) images reveal that abundant and complicated mineral inclusions occur in zoned zircon separates from paragneisses in drill holes CCSDPP2, ZK-2304, and CCSD-MH, at Donghai, southwestern Sulu terrane, China. Many low-P mineral inclusions are preserved in inherited zircon cores. Coesite + quartz within a single inclusion, and some low-P minerals (e.g., quartz and albite) are identified in zircon mantles. Textures showing the quartz to coesite transformation in zircon indicate that both core and mantle of the zircon are detrital. Inclusions of coesite, together with garnet, jadeite, and phengite, are common in zircon rims formed during ultrahigh-pressure (UHP) metamorphism. SHRIMP U-Pb analyses of these zoned zircon grains identify three discrete and meaningful age groups. Proterozoic ages of 840 to 658 Ma for zircon cores indicate that the detrital zircons have a variety of sources. An early Paleozoic group of 505 to 455 Ma ages for zircon mantles constrain neither the timing of a discrete UHP metamorphic event, nor the transformation age from quartz to coesite. The 227 ± 9 Ma (the weighted mean age) obtained from coesite-bearing zircon rims represents the UHP metamorphic age. Thus, one Late Triassic UHP metamorphic event, rather than two UHP metamorphic events, is well established in Sulu UHP terrane by the method of U-Pb SHRIMP dating for coesite-bearing zircon rims in garnet-biotite-amphibole-albite gneisses.
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Factors in the preservation of coesite: The importance of fluid inflitration
- U-Pb SHRIMP ages recorded in the coesite-bearing zircon domains of paragneisses in the southwestern Sulu terrane, eastern China: New interpretation
- Petrogenesis of the Yangkou layered garnet-peridotite complex, Sulu UHP terrane, China
- Sodic amphibole exsolutions in garnet from garnet-peridotite, North Qaidam UHPM belt, NW China: Implications for ultradeep-origin and hydroxyl defects in mantle garnets
- Blueschists, eclogites, and decompression assemblages of the Zermatt-Saas ophiolite: High-pressure metamorphism of subducted Tethys lithosphere
- Coexisting retrograde jadeite and omphacite in a jadeite-bearing lawsonite eclogite from the Motagua Fault Zone, Guatemala
- Calibrations of modal space for metamorphism of mafic schist
- Oxygen isotope geochemistry of rocks from the Pre-Pilot Hole of the Chinese Continental Scientific Drilling Project (CCSD-PPH1)
- Subducted carbonates, metasomatism of mantle wedges, and possible connections to diamond formation: An example from California
- Hawaiian mantle xenoliths and magmas: Composition and thermal character of the lithosphere
- Trace-element distribution coefficients for pyroxenes, plagioclase, and olivine in evolved tholeiites from the 1955 eruption of Kilauea Volcano, Hawaiʼi, and petrogenesis of differentiated rift-zone lavas
- Cation ordering in synthetic low-calcium actinolite
- Acquisition and evaluation of thermodynamic data for bieberite-moorhouseite equilibria at 0.1 MPa
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- Synthesis and characterization of saponite clays: Part 2. Thermal stability
- Estimates of Ar diffusion and solubility in leucite and nepheline: Electron microprobe imaging of Ar distribution in a mineral
- Growth and dissolution kinetics at the dolomite-water interface: An in-situ scanning probe microscopy study
- Crystal chemistry of Zn-rich rhodonite (“fowlerite”)
- The origin of the green color of variscite
- HRTEM evidence for 8-reversals in the m = 17 antigorite polysome
- Origin of high-Ag fahlores from the Galena Mine, Wallace, Idaho, U.S.A.
- Stability of the MgCO3 structures under lower mantle conditions
- The 10 Å phase: Crystal structure from single-crystal X-ray data
- Letter: Unquenchable hexagonal perovskite in high-pressure polymorphs of strontium silicates
