Controls on Trace Element Uptake in Metamorphic Titanite: Implications for Petrochronology

Garber, Joshua M.; Hacker, Bradley R.; Kylander‐Clark, Andrew; Stearns, Michael A.; Seward, Gareth

doi:10.1093/petrology/egx046

Cited by 94 publications

(86 citation statements)

References 103 publications

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“…Hornblende-plagioclase thermometry give similar equilibration temperatures ranging from 676 °C to 695 °C (Scott et al, 2009). We follow other works in interpreting these textural and geochemical features as magmatic in origin (Smith et al, 2009;Kohn and Corrie, 2011;Gao et al, 2012;Cao et al, 2015;Fu et al, 2016;Garber et al, 2017). Lower-intercept ages range from 122.3 Ma to 117.3 Ma, which overlap with and are also younger than low-strain fabric formation bracketed by zircon ages from host and postkinematic dikes (ca.…”

Section: Early Low-strain (S 1 ) Fabric Developmentsupporting

confidence: 75%

“…9 and 12). Middle (M) REEs are more strongly partitioned into type II titanites than LREEs, and this behavior has been associated with metamorphic reactions in several titanite geochemical studies (Della Ventura et al, 1999;Olin and Wolff, 2012;Che et al, 2013;Garber et al, 2017;Loader et al, 2017). Zr-in-titanite temperatures generally show a narrow crystallization range (typically <50 °C), and rock-average temperatures range from ~610 °C to 700 °C, with the highest temperature recorded in the Lake Manapouri mylonites (660-700 °C) and slightly lower average temperatures recorded in the Lake Te Anau mylonites (610-660 °C).…”

Section: High-strain Fabric Developmentmentioning

confidence: 99%

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Temporal and spatial variations in magmatism and transpression in a Cretaceous arc, Median Batholith, Fiordland, New Zealand

et al. 2019

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We investigated the interplay between deformation and pluton emplacement with the goal of providing insights into the role of transpression and arc magmatism in forming and modifying continental arc crust. We present 39 new laser-ablation–split-stream–inductively coupled plasma–mass spectrometry (LASS-ICP-MS) and secondary ion mass spectrometry (SIMS) 206Pb/238U zircon and titanite dates, together with titanite geochemistry and temperatures from the lower and middle crust of the Mesozoic Median Batholith, New Zealand, to (1) constrain the timing of Cretaceous arc magmatism in the Separation Point Suite, (2) document the timing of titanite growth in low- and high-strain deformational fabrics, and (3) link spatial and temporal patterns of lithospheric-scale transpressional shear zone development to the Cretaceous arc flare-up event. Our zircon results reveal that Separation Point Suite plutonism lasted from ca. 129 Ma to ca. 110 Ma in the middle crust of eastern and central Fiordland. Deformation during this time was focused into a 20-km-wide, arc-parallel zone of deformation that includes previously unreported segments of a complex shear zone that we term the Grebe shear zone. Early deformation in the Grebe shear zone involved development of low-strain fabrics with shallowly plunging mineral stretching lineations from ca. 129 to 125 Ma. Titanites in these rocks are euhedral, are generally aligned with weak subsolidus fabrics, and give rock-average temperatures ranging from 675 °C to 700 °C. We interpret them as relict magmatic titanites that grew prior to low-strain fabric development. In contrast, deformation from ca. 125 to 116 Ma involved movement along subvertical, mylonitic shear zones with moderately to steeply plunging mineral stretching lineations. Titanites in these shear zones are anhedral grains/aggregates that are aligned within mylonitic fabrics and have rock-average temperatures ranging from ∼610 °C to 700 °C. These titanites are most consistent with (re)crystallization in response to deformation and/or metamorphic reactions during amphibolite-facies metamorphism. At the orogen scale, spatial and temporal patterns indicate that the Separation Point Suite flare-up commenced during low-strain deformation in the middle crust (ca. 129–125 Ma) and peaked during high-strain, transpressional deformation (ca. 125–116 Ma), during which time the magmatic arc axis widened to 70 km or more. We suggest that transpressional deformation during the arc flare-up event was an important process in linking melt storage regions and controlling the distribution and geometry of plutons at mid-crustal levels.

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Section: Early Low-strain (S 1 ) Fabric Developmentsupporting

confidence: 75%

Section: High-strain Fabric Developmentmentioning

confidence: 99%

Temporal and spatial variations in magmatism and transpression in a Cretaceous arc, Median Batholith, Fiordland, New Zealand

et al. 2019

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“…The Western Gneiss region experienced Precambrian granulite-facies metamorphism, 460-425 Ma Barrovian metamorphism progressing to 425-405 Ma eclogite facies metamorphism at up to 3.6 GPa (Cuthbert, Carswell, Krogh-Ravna, & Wain, 2000), and then near-isothermal decompression to 0.5-1.0 GPa during amphibolite facies metamorphism at c. 400-380 Ma Holder et al, 2015;Kylander-Clark & Hacker, 2014;Labrousse et al, 2004;Root et al, 2005;Walsh & Hacker, 2004). This late amphibolite facies overprint occurred at 650-775°C (Garber, Hacker, Kylander-Clark, Stearns, & Seward, 2017). All the samples in this study are pelitic or quartzofeldspathic, and contain apatite; one (E9804J1) contains xenotime and two (E9814A5, E1614C) contain allanite (see descriptions in Hacker et al, 2015;Holder et al, 2015).…”

Section: The Study Areamentioning

confidence: 97%

“…400–380 Ma (Hacker et al., ; Holder et al., ; Kylander‐Clark & Hacker, ; Labrousse et al., ; Root et al., ; Walsh & Hacker, ). This late amphibolite facies overprint occurred at 650–775°C (Garber, Hacker, Kylander‐Clark, Stearns, & Seward, ). All the samples in this study are pelitic or quartzofeldspathic, and contain apatite; one (E9804J1) contains xenotime and two (E9814A5, E1614C) contain allanite (see descriptions in Hacker et al., ; Holder et al., ).…”

Section: Metamorphic History Of the Study Areamentioning

confidence: 99%

REE partitioning between monazite and garnet: Implications for petrochronology

Hacker

Kylander-Clark

Holder

2018

Journal Metamorphic Geology

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Rare‐earth element and Y partitioning between garnet and monazite was measured in metamorphic rocks from western Norway to provide more confidence in tying monazite U/Th–Pb dates to P–T conditions recorded in garnet. A subset of samples has low‐Y garnet mantles and low‐Y monazite cores that gave Y‐partitioning temperatures similar to independently determined metamorphic temperatures. In combination with previously published data, these monazite–garnet pairs have temperature‐dependent partitioning of the HREE from Dy to Lu, and nonsystematic partitioning of the LREE from La–Gd. The temperature‐dependent partitioning must be considered when using HREE to assess which portions of garnet and monazite might have coexisted, but experiments are needed to place the dependence on a firm footing.

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“…Titanite U-Pb ages have been used extensively, for example, in the Western Gneiss Region in Norway to constrain the age (and rate) of exhumation (e.g. Garber, Hacker, Kylander-Clark, Stearns, & Seward, 2017).…”

Section: Introductionmentioning

confidence: 99%

Integrated garnet and zircon–titanite geochronology constrains the evolution of ultra‐high–pressure terranes: An example from the Sulu orogen

Vervoort

Fisher

et al. 2019

Journal Metamorphic Geology

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Dating ultra‐high–pressure (UHP) metamorphic rocks provides important timing constraints on deep subduction zone processes. Eclogites, deeply subducted rocks now exposed at the surface, undergo a wide range of metamorphic conditions (i.e. deep subduction and exhumation) and their mineralogy can preserve a detailed record of chronologic information of these dynamic processes. Here, we present an approach that integrates multiple radiogenic isotope systems in the same sample to provide a more complete timeline for the subduction–collision–exhumation processes, based on eclogites from the Dabie–Sulu orogenic belt in eastern China, one of the largest UHP terranes on Earth. In this study, we integrate garnet Lu–Hf and Sm–Nd ages with zircon and titanite U–Pb ages for three eclogite samples from the Sulu UHP terrane. We combine this age information with Zr‐in‐rutile temperature estimates, and relate these multiple chronometers to different P–T conditions. Two types of rutile, one present as inclusions in garnet and the other in the matrix, record the temperatures of UHP conditions and a hotter stage, subsequent to the peak pressure (‘hot exhumation') respectively. Garnet Lu–Hf ages (c. 238–235 Ma) record the initial prograde growth of garnet, while coupled Sm–Nd ages (c. 219–213 Ma) reflect cooling following hot exhumation. The maximum duration of UHP conditions is constrained by the age difference of these two systems in garnet (c. 235–220 Ma). Complementary zircon and titanite U–Pb ages of c. 235–230 Ma and c. 216–206 Ma provide further constraints on the timing of prograde metamorphism and the ‘cold exhumation' respectively. We demonstrate that timing of various metamorphic stages can thus be determined by employing complementary chronometers from the same samples. These age results, combined with published data from adjacent areas, show lateral diachroneity in the Dabie–Sulu orogeny. Three sub‐blocks are thus defined by progressively younger garnet ages: western Dabie (243–238 Ma), eastern Dabie–northern Sulu (238–235 Ma) and southern Sulu terranes (225–220 Ma), which possibly correlate to different crustal slices in the recently proposed subduction channel model. These observed lateral chronologic variations in a large UHP terrane can possibly be extended to other suture zones.

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Controls on Trace Element Uptake in Metamorphic Titanite: Implications for Petrochronology

Cited by 94 publications

References 103 publications

Temporal and spatial variations in magmatism and transpression in a Cretaceous arc, Median Batholith, Fiordland, New Zealand

Temporal and spatial variations in magmatism and transpression in a Cretaceous arc, Median Batholith, Fiordland, New Zealand

REE partitioning between monazite and garnet: Implications for petrochronology

Integrated garnet and zircon–titanite geochronology constrains the evolution of ultra‐high–pressure terranes: An example from the Sulu orogen

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