https://cyberleninka.org/article/n/862582.pdf

Calibration and correction of LA-ICP-MS and LA-MC-ICP-MS analyses for element contents and isotopic ratios

Laser ablation split-stream analysis of the Sm-Nd and U-Pb isotope compositions of monazite, titanite, and apatite - Improvements, potential reference materials, and application to the Archean Saglek Block gneisses

In situ trace element and Sm-Nd isotope analysis of accessory minerals in an Eoarchean tonalitic gneiss from Greenland: Implications for Hf and Nd isotope decoupling in Earth's ancient rocks

https://ntrs.nasa.gov/api/citations/20190002202/downloads/20190002202.pdf

Unravelling complex geologic histories using U–Pb and trace element systematics of titanite

The Greater Himalayan Sequence (GHS) has commonly been treated as a large coherently deforming high-grade tectonic package, exhumed primarily by simultaneous thrust- and normal-sense shearing on its bounding structures and erosion along its frontal exposure. A new paradigm, developed over the past decade, suggests that the GHS is not a single high-grade lithotectonic unit, but consists of in-sequence thrust sheets. In this study, we examine this concept in central Nepal by integrating temperature-time (T-t) paths, based on coupled Zr-in-titanite thermometry and U-Pb geochronology for upper GHS calcsilicates, with traditional thermobarometry, textural relationships, and field mapping. Peak Zr-in-titanite temperatures are 760-850 °C at 10-14 kbar and U-Pb ages of titanite range from c. 30 to c. 15 Ma. Sector zoning of Zr and distribution of U-Pb ages within titanite suggest that diffusion rates of Zr and Pb are slower than experimentally-determined rates, and these systems remain unaffected into the lower granulite facies. Two types of T-t paths occur across the Chame Shear Zone (CSZ). Between c. 25 and 17-16 Ma, hanging wall rocks cool at rates of 1-10 °C/Ma while foot wall rocks heat at rates of 1-10 °C/Ma. Over the same interval, temperatures increase structurally upwards through the hanging wall, but by 16-17 Ma temperatures converge. In contrast, temperatures decrease upwards in foot wall rocks at all times. While the foot wall is interpreted as an intact, structurally-upright, section, the thermometric inversion within the hanging wall suggests thrusting of hotter rocks over colder from c. 25 to c. 17-16 Ma. Retrograde hydration that is restricted to the hanging wall, and a lithological repetition of orthogneiss are consistent with thrust sense shear on the CSZ. The CSZ is structurally higher than previously-identified intra-GHS thrusts in central Nepal, and thrusting duration was 3-6 Ma longer than proposed for other intra-GHS thrusts in this region. Cooling rates for both the hanging wall and foot wall of the CSZ are comparable to or faster than rates for other intra-GHS thrust sheets in Nepal. The overlap in high temperature titanite U-Pb ages and previously published muscovite 40Ar/39Ar cooling ages imply cooling rates for the hanging wall of ≥ 200 °C/Ma after thrusting. Causes of rapid cooling include passive exhumation driven by a combination of duplexing in the Lesser Himalayan Sequence, and juxtaposition of cooler rocks on top of the GHS by the STDS. Normal-sense displacement does not appear to affect T-t paths for rocks immediately below the STDS prior to 17-16 Ma.

This article is protected by copyright. All rights reserved.

https://scholarworks.boisestate.edu/cgi/viewcontent.cgi?article=2181&context=td

Protracted Thrusting Followed by Late Rapid Cooling of the Greater Himalayan Sequence, Annapurna Himalaya, Central Nepal: Insights from Titanite Petrochronology

MKED1: A new titanite standard for in situ analysis of Sm–Nd isotopes and U–Pb geochronology

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MKED1: A new titanite standard for in situ analysis of Sm–Nd isotopes and U–Pb geochronology