Zircon Hf isotope of Yingfeng Rapakivi granites from the Quanji Massif and ~2.7 Ga crustal growth

Nengsong CHEN; Songlin GONG; Xiaoping XIA; Hongyan GENG; Lu WANG; Min SUN; Timothy M. KUSKY

doi:10.1007/s12583-013-0309-2

Zircon Hf isotope of Yingfeng Rapakivi granites from the Quanji Massif and ~2.7 Ga crustal growth

Nengsong CHEN^*, Songlin GONG, Xiaoping XIA, Hongyan GENG, Lu WANG, Min SUN, Timothy M. KUSKY

^*Corresponding author for this work

Research output: Journal Publications › Journal Article (refereed) › peer-review

41 Citations (Scopus)

Abstract

The Quanji (Chinese Source) Massif is located in the Northwest China, which is interpreted as a micro-continent that is composed of metamorphic basement and stable cover strata. There are some controversies of genetic relationship between the Quanji Massif and the major cratons in China. In this study, we obtained in situ zircon U-Pb and Hf isotopic compositions of the Yingfeng (Chinese Source) rapakivi granites from the northwest Quanji Massif by application of LA-MC-ICP-MS technique. Twenty U-Pb age measurements points are concordant or near concordant, and their weighted mean ²⁰⁷Pb/²⁰⁶Pb age is 1 793. 9±6. 4 Ma (MSWD= 1. 09), yields an upper intercept age of 1 800±17 Ma (MSWD=0. 41); 19 Hf isotope measurements yield a two-stage Hf model ages (T_DM2) of 2. 63 to 2. 81 Ga, with a weighted average age of about 2. 70±0. 02 Ga and e{open}Hf(t) values variate between -8. 91 to -5. 35. This indicates that magma source of the Yingfeng rapakivi granites were produced from partial melting of late stage of Neoarchean juvenile crust, and suggests a significant crustal growth event occurred in the Quanji Massif at that time. The Quanji Massif might be an ancient continental segment detached from the Tarim Craton based on the crustal growth history and other geological records. The Tarim Craton (including the Quanji Massif) and the North China Craton had a similar or homological early crustal evolution around ~2. 7 Ga, which implies that Tarim Craton might be one of the component parts of North China Craton.

Original language	English
Pages (from-to)	29-41
Number of pages	13
Journal	Journal of Earth Science
Volume	24
Issue number	1
DOIs	https://doi.org/10.1007/s12583-013-0309-2
Publication status	Published - Feb 2013
Externally published	Yes

Bibliographical note

We thank Profs. Mingguo Zhai and Songnian Lu for their guidance to our investigation on Precambrian geology in Northwest China. An earlier version of the manuscript benefited much from the constructive comments by two anonymous reviewers. We are also grateful to Drs. Yanru Song and Jun Xiao for their competent editorial handling.

Funding

This research was supported by the National Natural Science Foundation of China (Nos. 40972042, 40772041, 91014002) and the Research Grant Council of Hong Kong RGC (No. HKU705311P).

Keywords

crustal growth
Quanji Massif
rapakivi granite
Tarim-North China Craton
tectonic evolution
zircon Hf isotope

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10.1007/s12583-013-0309-2

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title = "Zircon Hf isotope of Yingfeng Rapakivi granites from the Quanji Massif and ~2.7 Ga crustal growth",

abstract = "The Quanji (Chinese Source) Massif is located in the Northwest China, which is interpreted as a micro-continent that is composed of metamorphic basement and stable cover strata. There are some controversies of genetic relationship between the Quanji Massif and the major cratons in China. In this study, we obtained in situ zircon U-Pb and Hf isotopic compositions of the Yingfeng (Chinese Source) rapakivi granites from the northwest Quanji Massif by application of LA-MC-ICP-MS technique. Twenty U-Pb age measurements points are concordant or near concordant, and their weighted mean 207Pb/206Pb age is 1 793. 9±6. 4 Ma (MSWD= 1. 09), yields an upper intercept age of 1 800±17 Ma (MSWD=0. 41); 19 Hf isotope measurements yield a two-stage Hf model ages (TDM2) of 2. 63 to 2. 81 Ga, with a weighted average age of about 2. 70±0. 02 Ga and e{open}Hf(t) values variate between -8. 91 to -5. 35. This indicates that magma source of the Yingfeng rapakivi granites were produced from partial melting of late stage of Neoarchean juvenile crust, and suggests a significant crustal growth event occurred in the Quanji Massif at that time. The Quanji Massif might be an ancient continental segment detached from the Tarim Craton based on the crustal growth history and other geological records. The Tarim Craton (including the Quanji Massif) and the North China Craton had a similar or homological early crustal evolution around ~2. 7 Ga, which implies that Tarim Craton might be one of the component parts of North China Craton.",

keywords = "crustal growth, Quanji Massif, rapakivi granite, Tarim-North China Craton, tectonic evolution, zircon Hf isotope",

author = "Nengsong CHEN and Songlin GONG and Xiaoping XIA and Hongyan GENG and Lu WANG and Min SUN and KUSKY, {Timothy M.}",

note = "We thank Profs. Mingguo Zhai and Songnian Lu for their guidance to our investigation on Precambrian geology in Northwest China. An earlier version of the manuscript benefited much from the constructive comments by two anonymous reviewers. We are also grateful to Drs. Yanru Song and Jun Xiao for their competent editorial handling.",

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doi = "10.1007/s12583-013-0309-2",

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AU - CHEN, Nengsong

AU - GONG, Songlin

AU - XIA, Xiaoping

AU - GENG, Hongyan

AU - WANG, Lu

AU - SUN, Min

AU - KUSKY, Timothy M.

N1 - We thank Profs. Mingguo Zhai and Songnian Lu for their guidance to our investigation on Precambrian geology in Northwest China. An earlier version of the manuscript benefited much from the constructive comments by two anonymous reviewers. We are also grateful to Drs. Yanru Song and Jun Xiao for their competent editorial handling.

PY - 2013/2

Y1 - 2013/2

N2 - The Quanji (Chinese Source) Massif is located in the Northwest China, which is interpreted as a micro-continent that is composed of metamorphic basement and stable cover strata. There are some controversies of genetic relationship between the Quanji Massif and the major cratons in China. In this study, we obtained in situ zircon U-Pb and Hf isotopic compositions of the Yingfeng (Chinese Source) rapakivi granites from the northwest Quanji Massif by application of LA-MC-ICP-MS technique. Twenty U-Pb age measurements points are concordant or near concordant, and their weighted mean 207Pb/206Pb age is 1 793. 9±6. 4 Ma (MSWD= 1. 09), yields an upper intercept age of 1 800±17 Ma (MSWD=0. 41); 19 Hf isotope measurements yield a two-stage Hf model ages (TDM2) of 2. 63 to 2. 81 Ga, with a weighted average age of about 2. 70±0. 02 Ga and e{open}Hf(t) values variate between -8. 91 to -5. 35. This indicates that magma source of the Yingfeng rapakivi granites were produced from partial melting of late stage of Neoarchean juvenile crust, and suggests a significant crustal growth event occurred in the Quanji Massif at that time. The Quanji Massif might be an ancient continental segment detached from the Tarim Craton based on the crustal growth history and other geological records. The Tarim Craton (including the Quanji Massif) and the North China Craton had a similar or homological early crustal evolution around ~2. 7 Ga, which implies that Tarim Craton might be one of the component parts of North China Craton.

AB - The Quanji (Chinese Source) Massif is located in the Northwest China, which is interpreted as a micro-continent that is composed of metamorphic basement and stable cover strata. There are some controversies of genetic relationship between the Quanji Massif and the major cratons in China. In this study, we obtained in situ zircon U-Pb and Hf isotopic compositions of the Yingfeng (Chinese Source) rapakivi granites from the northwest Quanji Massif by application of LA-MC-ICP-MS technique. Twenty U-Pb age measurements points are concordant or near concordant, and their weighted mean 207Pb/206Pb age is 1 793. 9±6. 4 Ma (MSWD= 1. 09), yields an upper intercept age of 1 800±17 Ma (MSWD=0. 41); 19 Hf isotope measurements yield a two-stage Hf model ages (TDM2) of 2. 63 to 2. 81 Ga, with a weighted average age of about 2. 70±0. 02 Ga and e{open}Hf(t) values variate between -8. 91 to -5. 35. This indicates that magma source of the Yingfeng rapakivi granites were produced from partial melting of late stage of Neoarchean juvenile crust, and suggests a significant crustal growth event occurred in the Quanji Massif at that time. The Quanji Massif might be an ancient continental segment detached from the Tarim Craton based on the crustal growth history and other geological records. The Tarim Craton (including the Quanji Massif) and the North China Craton had a similar or homological early crustal evolution around ~2. 7 Ga, which implies that Tarim Craton might be one of the component parts of North China Craton.

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KW - Quanji Massif

KW - rapakivi granite

KW - Tarim-North China Craton

KW - tectonic evolution

KW - zircon Hf isotope

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Zircon Hf isotope of Yingfeng Rapakivi granites from the Quanji Massif and ~2.7 Ga crustal growth

Abstract

Bibliographical note

Funding

Keywords

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