Lu-Hf Dating: The Lu-Hf Isotope System

Vervoort, Jeff D.

doi:10.1007/978-94-007-6304-3_46

Cited by 15 publications

(8 citation statements)

References 79 publications

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“…The εHf and the εNd are often used to explain the origin of magmatic sources relative to the bulk Earth or CHUR (Bouvier et al ., 2008; Vervoort, 2014), which is linked to tectonic setting (Gardiner et al ., 2016a) and the mineralization potential (e.g., Mole et al ., 2013; Wang et al ., 2016a, 2017). The evolved zircon Hf isotopic signatures as shown by negative εHf values, are typical for S‐type granitoids in continental collision setting that are commonly associated with tin and tungsten mineralization (Villaros et al ., 2012; Gardiner et al ., 2016a, 2016b, 2016c, 2017, 2018).…”

Section: Discussionmentioning

confidence: 99%

Zircon Hf‐isotope constraints on the formation of metallic mineral deposits in Thailand

et al. 2021

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The effects of the Sibumasu–Indochina Terranes collision created several kinds of mineral deposits in Thailand, which include porphyry–skarn copper–gold, epithermal gold and antimony, orogenic gold–antimony–tungsten and tin‐tungsten mineralization among others. The deposits show a distinct spatial zonal distribution and occur in specific tectonic terranes. Combining regional geological data and ore deposit distribution data with Hf‐isotopic data of zircons in igneous rocks can be used to investigate the relationship between crustal construction processes and metallogeny. In this study, we investigated the Sukhothai Fold Belt, which is composed of quartz monzodiorite, granodiorite, syenogranite, and monzogranite of I‐ and S‐type affinities. All granitoids were analyzed for zircon U–Pb geochronology and Lu–Hf isotopic analysis. The granitoids of the Sukhothai Fold Belt yielded U–Pb zircon ages ranging from ~243 to 202 Ma, which mark the timing of subduction to the syn‐collisional stage between the Sibumasu–Indochina terranes at ~243–237 Ma and the timing of post‐collision between the Sibumasu–Indochina terranes during 230–202 Ma. In addition, an age of ~43 Ma in the south of the Sukhothai Fold Belt may indicate intrusion during the sinistral movement of the Klaeng and Mae Ping fault zones resulted from the Indian–Eurasian plate collision. The Doi Tung quartz monzodiorite provided an age of ~350 Ma as a timing of formation of the Sukhothai Fold Belt. The negative and positive initial εHf values (−8.0 to +9.2) with two‐stage depleted mantle model ages (TDMC of 2.2–0.6 Ga) of zircons from the Sukhothai Fold Belt granitoids indicate that the sources of their magma derived from partial melting of old continental crust and young oceanic crust, which probably mixed with a mantle‐derived magma. A zircon Hf‐isotope compilation including the data obtained in this study and previously reported values was used to prepare a map that allows a comparison between magmatic source and mineral deposit distribution in Thailand. The spatial distribution of Hf isotopic data reveals a distinct zonation, with initial εHf values decreasing from the east to the west, that is, from the western margin of the Indochina Terrane or the Loei Fold Belt to the Sukhothai Fold Belt, the Inthanon Zone and the Sibumasu Terrane. The magmatic source for the granitoids in the Loei Fold Belt is dominated by mantle‐derived components, as shown by positive average initial εHf values (+1.0 to +12.7), and contributed to porphyry‐related skarn copper–gold and iron and epithermal gold mineralization. In contrast, magmas in the Sibumasu Terrane and the Inthanon Zone originated from melting of old crustal materials, as indicated by mostly negative average initial εHf values (−15.1 to +0.8), and are responsible for S‐type granite‐related tin‐tungsten mineralization. The average initial εHf values (−5.0 to +11.0) from the intrusions in the Sukhothai Fold Belt suggest mixed sources, including evolved and juvenile magmatic materials, which generated the oroge...

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Section: Discussionmentioning

confidence: 99%

Zircon Hf‐isotope constraints on the formation of metallic mineral deposits in Thailand

et al. 2021

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“…An analysis of Lu-Hf isotopic ratios in igneous rocks provides information into the how "isotopically evolved" a melt was at the time of crystallization (e.g., Vervoort, 2014). In the Lu-Hf system, the daughter product prefers to partition into melt, which results in crustal rocks having relatively depleted Hf values.…”

Section: Lu-hf Isotopesmentioning

confidence: 99%

Magmatism and Extension in the Anaconda Metamorphic Core Complex of Western Montana and Relation to Regional Tectonics

2021

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Metamorphic core complexes (MCCs) are domal geological structures that result from the exhumation of the mid-to-lower crust (e.g., Crittenden et al., 1980). These structures are significant because they represent locations of extreme crustal extension and provide illuminating windows into the thermomechanical properties of Earth's lithosphere (e.g., Platt et al., 2015;Whitney et al., 2013). First described in the western United States, MCCs consist of a ductilely deformed metamorphic-plutonic footwall separated from a brittlely deformed hanging wall by a low-angle normal fault (detachment fault) (Armstrong, 1982;Coney, 1980;Wernicke, 1981). Despite their widespread occurrence and tectonic significance, the origin of core complexes-specifically the regional tectonic processes that facilitate footwall exhumation from mid-crustal depths-remains controversial (e.g., Konstantinou et al., 2013). Several orogen-scale dynamic models have been proposed for MCC formation in the North American Cordillera, including: (a) a change in plate motions, (b) dynamic processes of the downgoing slab (e.g., slab rollback), and (c) late or post-orogenic collapse due to overthickened continental crust (e.g., Whitney et al., 2013). In the North American Cordillera, MCCs form an N-S trending belt that traces a pre-extensional lithospheric welt, where crustal thicknesses and

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“…Due to the small amount of 207 [15]. e Hf isotopic data process details were described by Vervoort et al [16] and Vervoort [17]. e weighted mean 176 Hf/ 177 Hf ratio of standard zircon 91500 is 0.282303 ± 28 (2σ), which is indistinguishable with a weighted mean 176 Hf/ 177 Hf ratio of 0.282307 ± 31 (2σ) [18].…”

Section: Zircon Icp-ms U-pb Dating Lu-hf Isotopic Analysis and Trace Elements' Analysismentioning

confidence: 99%

Zircon U–Pb Dating and Lu‐Hf Isotope of the Retrograded Eclogite from Chicheng, Northern Hebei Province, China

Kong

et al. 2021

Shock and Vibration

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We report zircon U–Pb ages and Lu-Hf isotopic data from two sample of the retrograded eclogite in the Chicheng area. Two groups of the metamorphic zircons from the Chicheng retrograded eclogite were identified: group one shows characteristics of depletion in LREE and flat in HREE curves and exhibit no significant Eu anomaly, and this may imply that they may form under eclogite facies metamorphic condition; group two is rich in HREE and shows slight negative Eu anomaly indicated that they may form under amphibolite facies metamorphic condition. Zircon Lu-Hf isotopic of εHf from the Chicheng eclogite has larger span range from 6.0 to 18.0, which suggests that the magma of the eclogite protolith may be mixed with partial crustal components. The peak eclogite facies metamorphism of Chicheng eclogite may occur at 348.5–344.2 Ma and its retrograde metamorphism of amphibolite fancies may occur at ca. 325.0 Ma. The Hongqiyingzi Complex may experience multistage metamorphic events mainly including Late Archean (2494–2448 Ma), Late Paleoproterozoic (1900–1734 Ma, peak age = 1824.6 Ma), and Phanerozoic (495–234 Ma, peak age = 323.7 Ma). Thus, the metamorphic event (348.5–325 Ma) of the Chicheng eclogite is in accordance with the Phanerozoic metamorphic event of the Hongqiyingzi Complex. The eclogite facies metamorphic age of the eclogite is in accordance with the metamorphism (granulite facies or amphibolite facies) of its surrounding rocks, which implied that the tectonic subduction and exhumation of the retrograded eclogite may cause the regional metamorphism of garnet biotite plagioclase gneiss.

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Lu-Hf Dating: The Lu-Hf Isotope System

Cited by 15 publications

References 79 publications

Zircon Hf‐isotope constraints on the formation of metallic mineral deposits in Thailand

Zircon Hf‐isotope constraints on the formation of metallic mineral deposits in Thailand

Magmatism and Extension in the Anaconda Metamorphic Core Complex of Western Montana and Relation to Regional Tectonics

Zircon U–Pb Dating and Lu‐Hf Isotope of the Retrograded Eclogite from Chicheng, Northern Hebei Province, China

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