In-situ calcite U-Pb geochronology of hydrothermal veins in Thailand: New constraints on Indosinian and Cenozoic deformation

Simpson, Alexander; Glorie, Stijn; Morley, C.K.; Gillespie, Jack; Lee, Jack K.

doi:10.1016/j.jseaes.2020.104649

Cited by 20 publications

(3 citation statements)

References 52 publications

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“…"initial" or "common" Pb), which can limit the utility of U-Pb geochronology (Rasbury and Cole, 2009). Moreover, Pb is highly fluid mobile , so it can be difficult to obtain primary age information with the U-Pb method in hydrothermal or strongly altered systems (Roberts et al, 2020;Simpson et al, 2021b). Further, given the propensity for calcite to undergo recrystallisation, calcite U-Pb geochronology is rarely applicable to Precambrian systems as the calcite U-Pb system invariably does not remain closed over long timescales (Whitehouse and Russell, 1997).…”

Section: Introductionmentioning

confidence: 99%

In situ Lu–Hf geochronology of calcite

et al. 2022

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Abstract. The ability to constrain the age of calcite formation is of great utility to the Earth science community, due to the ubiquity of calcite across a wide spectrum of geological systems. Here, we present the first in situ laser ablation inductively coupled tandem quadrupole mass spectrometry (LA-ICP-MS/MS) Lu–Hf ages for calcite, demonstrating geologically meaningful ages for iron oxide copper gold (IOCG) and skarn mineralisation, carbonatite intrusion, and low-grade metamorphism. The analysed samples range in age between ca. 0.9 and ca. 2 Ga with uncertainties between 1.7 % and 0.6 % obtained from calcite with Lu concentrations as low as ca. 0.5 ppm. The Lu–Hf system in calcite appears to be able to preserve primary precipitation ages over a significant amount of geological time, although further research is required to constrain the closure temperature. The in situ approach allows calcite to be rapidly dated while maintaining its petrogenetic context with mineralisation and other associated mineral processes. Therefore, LA-ICP-MS/MS Lu–Hf dating of calcite can be used to resolve the timing of complex mineral paragenetic sequences that are a feature of many ancient rock systems.

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Section: Introductionmentioning

confidence: 99%

In situ Lu–Hf geochronology of calcite

et al. 2022

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“…The Three Pagodas Fault Zone (TPFZ, Figure 2) in western Thailand, estimated to be more than 700 km in length (Searle and Morley, 2011), represents a Cenozoic structure that developed in response to the India-Eurasia collision (e.g., Lacassin et al, 1997;Morley, 2002;Rhodes et al, 2005). 40 Ar-39 Ar dates, obtained from micas in gneisses within the TPFZ, suggest that ductile (left-lateral) slip occurred during the Late Eocene -Early Oligocene along the TPFZ (Lacassin et al, 1997;Nantasin et al, 2012;Simpson et al, 2020), and may have created several smaller pull-apart basins. Morley and Racey (2011) suggests that most basins were initiated in Oligocene, with possible exception of two basins (Mae Tun and Hongsa, Figure 2) that may have an Eocene section.…”

Section: Additional Data Points In the Sundaland Neighbourhoodmentioning

confidence: 99%

Eocene Sediments in the South China Sea, precursor deposits of the Oligocene expansion?

Kessler¹,

Jong

Madon

2021

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The stratigraphic record of Eocene in the Malaysian waters of the South China Sea is scarce; the few deep petroleum exploration wells and outcrops are located on the fringes of the SCS. Yet, despite the paucity of data we observe a variety of sediments that cover the range from fluviatile to (at least) neritic marine deposits. Whilst fluvial deposits dominate the Western Rim (Penyu, Malay basins), the Southern Rim (Sarawak) is characterized by deposits of a narrow and rapidly deepening shelf, with fluviatile, shallow marine clastics and carbonates passing seawards to outer shelf and neritic deposits. The proven record of the Eocene to-date is located in relatively small and deep sub-basins. Possibly, the Eocene underlies additional areas of the SCS, but there is to-date no sufficient well data to offer further confirmation. The presence of Eocene strata on the margins of Sundaland is associated with an early phase of extensional and/or transpressional tectonism, probably acting as precursor movements related to the onset of rifting of the crust underlying the SCS.

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“…'initial' or 'common' Pb), which can limit the utility of U-Pb geochronology (Rasbury and Cole, 2009). Moreover, Pb is highly fluid mobile (Brugger et al, 2016), so it can be difficult to obtain primary age information with the U-Pb method in hydrothermal or strongly-altered systems (Roberts et al, 2020;Simpson et al, 2021b). Further, given the propensity for calcite to undergo recrystallisation, calcite U-Pb geochronology is rarely applicable to Precambrian systems as the calcite U-Pb system invariably does not remain closed over long timescales.…”

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confidence: 99%

In-situ Lu – Hf geochronology of calcite

Simpson

Glorie

Hand

et al. 2022

Preprint

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Abstract. The ability to constrain the age of calcite formation is of great utility to the Earth Science community, due to the ubiquity of calcite across a wide spectrum of geological systems. Here, we present the first in-situ laser ablation inductively coupled tandem mass spectrometry (LA-ICP-MS/MS) Lu–Hf ages for calcite, demonstrating geologically meaningful ages for IOCG and skarn mineralisation, carbonatite intrusion and low grade metamorphism. The analysed samples range in age between ca. 0.9 Ga and ca. 2 Ga with uncertainties between 1.4 % and 0.5 % obtained from calcite with Lu concentrations as low as ca. 0.5 ppm. The Lu–Hf system in calcite appears to be able to preserve primary precipitation ages over a significant amount of geological time, although further research is required to constrain the closure temperature. The in-situ approach allows calcite to be rapidly dated while maintaining its petrogenetic context with mineralization and other associated mineral processes. Therefore, LA-ICP-MS/MS Lu–Hf dating of calcite can be used to resolve the timing of complex mineral paragenetic sequences that are a feature of many ancient rock systems.

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In-situ calcite U-Pb geochronology of hydrothermal veins in Thailand: New constraints on Indosinian and Cenozoic deformation

Cited by 20 publications

References 52 publications

In situ Lu–Hf geochronology of calcite

In situ Lu–Hf geochronology of calcite

Eocene Sediments in the South China Sea, precursor deposits of the Oligocene expansion?

In-situ Lu – Hf geochronology of calcite

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