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- W2583448077 abstract "The Chinese Southwestern Tianshan high- to ultra-high pressure low temperature (HP–UHP/LT) metamorphic belt exhibits well-preserved mafic layers, tectonic blocks/slices and boudins of different sizes and lithology embedded within dominant meta-volcanosedimentary rocks. Despite a wealth of previous studies on UHP relicts, P–T path estimates and age constraints for metamorphism, controversies still exist on P–T–t assessments and regional exhumation patterns (i.e., tectonic mélange versus internally coherent “sub-belt” model). This study focuses on a group of coesite-bearing eclogite samples from a thick (~ 5 m) layered metabasalt outcrop in order to unravel its detailed tectono-metamorphic evolution through space and time (both prograde, peak and exhumation). Using SIMS zircon U–Pb and oxygen isotope analyses, TIMS Sm–Nd multi-point isochron dating, in situ laser-ICP-MS trace-element analyses, classical thermobarometry and thermodynamic modeling, we link the multistage zircon growth to garnet growth and reconstruct a detailed P–T–time-isotopic evolution history for this UHP tectonic slice: from UHP peak burial ~ 2.95 ± 0.2 GPa, 510 ± 20 °C around 318.0 ± 2.3 Ma to HP peak metamorphism ~ 2.45 ± 0.2 GPa, 540 ± 20 °C at 316.8 ± 0.8 Ma, then, with eclogite-facies deformation ~ 2.0 ± 0.15 GPa, 525 ± 25 °C at 312 ± 2.5 Ma, exhumed to near surface within ca. 303 to ca. 280 Ma. Our P–T-time-isotopic results combined with the compilation of regional radiometric data and P–T estimates notably point to the existence of a short-lived period of rock detachment and exhumation (< 10 Ma, i.e. at ca. 315 ± 5 Ma) with respect to subduction duration." @default.
- W2583448077 created "2017-02-10" @default.
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- W2583448077 date "2017-05-01" @default.
- W2583448077 modified "2023-10-18" @default.
- W2583448077 title "P–T–time-isotopic evolution of coesite-bearing eclogites: Implications for exhumation processes in SW Tianshan" @default.
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