Decoupling of the Lu–Hf, Sm–Nd, and Rb–Sr isotope systems in eclogites and a garnetite from the Sulu ultra-high pressure metamorphic terrane: Causes and implications

Liu, Yung Hsin; Yang, Huai Jen; Takazawa, Eiichi; Satish-Kumar, M.; You, Chen Feng

doi:10.1016/j.lithos.2015.07.013

Cited by 5 publications

(4 citation statements)

References 100 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But the Sm–Nd isotope system for metamorphic rocks has been shown to be less likely affected by the inheritance of protolith zircon (e.g. Liu et al ., ). In this study, the three samples show ε Nd ( t ) values of −7.33 to −5.87 (Table S3), which are similar within analytical error.…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Distinct zircon U–Pb and O–Hf–Nd–Sr isotopic behaviour during fluid flow in UHP metamorphic rocks: evidence from metamorphic veins and their host eclogite in the Sulu Orogen, China

Zhao

Liu

et al. 2016

Journal Metamorphic Geology

View full text Add to dashboard Cite

Fluid plays a key role in metamorphism and magmatism in subduction zones. Veins in high-pressure (HP) to ultrahigh-pressure (UHP) rocks are the products of fluid-rock interaction, and can thus provide important constraints on fluid processes in subduction zones. This contribution is an integrated study of zircon U-Pb and O-Hf, as well as whole-rock Nd-Sr isotopic compositions for a quartz vein, a complex vein, and their host eclogite in the Sulu UHP terrane to decipher the timing and source of fluid flow under HP-UHP metamorphic conditions. The inherited magmatic zircon cores from the host eclogite constrain the protolith age at c. 750 Ma. Their variable e Hf (t) values from À1.11 to 2.54 and low d 18 O values of 0.32-3.40& reflect a protolith that formed in a rift setting due to the breakup of the supercontinent Rodinia. The hydrothermal zircon from the quartz and the complex veins shows euhedral shapes, relatively flat HREE pattern, slight or no negative Eu anomaly, low 176 Lu/ 177 Hf ratios, and low formation temperatures of 660-690°C, indicating they precipitated from fluids under HP eclogite facies conditions. This zircon yielded similar U-Pb ages of 217 AE 2 and 213 AE 3 Ma within analytical uncertainty, recording the timing of fluid flow during the exhumation of the UHP rock. It is inferred that the fluids might be of internal origin based on the homogeneity of d 18 O values of the hydrothermal zircon from the quartz (À2.41 AE 0.13&) and complex veins (À2.35 AE 0.12&), and the metamorphic grown zircon of the host eclogite (À2.23 AE 0.16&). The similar e Nd (t) values of the whole rocks also support such a point. Zircon O and whole-rock Nd isotopic compositions are therefore useful to identify the source of fluid, for they are major and trace components in minerals involved in metamorphic reactions during HP-UHP conditions. On the other hand, the hydrothermal zircon from the veins and the metamorphic zircon from the host eclogite exhibit variable e Hf (t) values. Model calculation suggests that the Hf was derived from the breakdown of major rock-forming minerals and recycling of the inherited magmatic zircon. The variable whole-rock initial 87 Sr/ 86 Sr ratios might be caused by subsequent retrograde metamorphism after the formation of the veins.

show abstract

Section: Discussionmentioning

confidence: 97%

“…The very variable initial 87 Sr/ 86 Sr ratios of 0.706348–0.714133 might result from the effect of retrograde amphibolite facies metamorphism (Fig. ), which has also been documented for eclogites from the Dabie‐Sulu terrane (Guo et al ., ; Liu et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Distinct zircon U–Pb and O–Hf–Nd–Sr isotopic behaviour during fluid flow in UHP metamorphic rocks: evidence from metamorphic veins and their host eclogite in the Sulu Orogen, China

Zhao

Liu

et al. 2016

Journal Metamorphic Geology

View full text Add to dashboard Cite

show abstract

“…Approximately 100 mg of the sediment sample was entirely dissolved during a series of digestion steps using concentrated HF, HNO3, and HCl (Liu et al, 2015;Chen et al, 2018). The Sr and Nd column chemistry used in this study is described in Huang and You (2007) and Huang et al (2012).…”

Section: Major Elements and Sr And Nd Isotopesmentioning

confidence: 99%

“…Silicate weathering of the exhumed Himalayan sediments consumes CO 2, resulting in a worldwide cooling effect and changes in atmospheric circulation patterns (Fluteau, 2003;Li et al, 2014;Zhang et al, 2015). To constrain this mechanism, contemporary studies in the last few decades focused on weathering processes driven by fluvial systems using radiogenic isotopes, e.g., rubidium (Rb), strontium (Sr), and neodymium (Nd) and their ratios (Bayon et al, 2021;Bickle et al, 2005;Dalai et al, 2003;Derry and France-Lanord, 1996;Galy et al, 1999;Nakano, 2016;Saitoh et al, 2020), major element chemistry (Bickle et al, 2018;Blum et al, 1998;English et al, 2000;Liu et al, 2015;Singh et al, 1998), and organic compounds and their diagnostic proxies (Bhandari et al, 2022(Bhandari et al, , 2021Kirkels et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Provenance, transport, and the fate of organic matter and sediments drained through Himalayan Rivers in Nepal

Bhandari

2023

Linköping Studies in Arts and Sciences

View full text Add to dashboard Cite

show abstract

Decoupling of Lu-Hf and Sm-Nd Isotopic System in Deep-Seated Xenoliths from the Xuzhou-Suzhou Area, China: Differences in Element Mobility during Metamorphism

Meng

et al. 2019

J. Earth Sci.

View full text Add to dashboard Cite

Decoupling of the Lu–Hf, Sm–Nd, and Rb–Sr isotope systems in eclogites and a garnetite from the Sulu ultra-high pressure metamorphic terrane: Causes and implications

Cited by 5 publications

References 100 publications

Distinct zircon U–Pb and O–Hf–Nd–Sr isotopic behaviour during fluid flow in UHP metamorphic rocks: evidence from metamorphic veins and their host eclogite in the Sulu Orogen, China

Distinct zircon U–Pb and O–Hf–Nd–Sr isotopic behaviour during fluid flow in UHP metamorphic rocks: evidence from metamorphic veins and their host eclogite in the Sulu Orogen, China

Provenance, transport, and the fate of organic matter and sediments drained through Himalayan Rivers in Nepal

Decoupling of Lu-Hf and Sm-Nd Isotopic System in Deep-Seated Xenoliths from the Xuzhou-Suzhou Area, China: Differences in Element Mobility during Metamorphism

Contact Info

Product

Resources

About