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Zircon U–Pb geochronology and elemental and Sr–Nd–Hf isotopic geochemistry of the Daocheng granitic pluton from the Yidun Arc, SW China
De-Feng He; Wei-Guang Zhu; Hong Zhong; Tao Ren; Zhong-Jie Bai; Hong-Peng Fan
2013
Source PublicationJournal of Asian Earth Sciences
Volume67–68Pages:1-17
Abstract

The Garze–Litang suture zone, located in the eastern part of the Tethyan tectonic domain, is notable for widespread Late Triassic granitic plutons, which are genetically associated with the evolution of the Paleo–Tethys Ocean. The Daocheng granitic pluton in the eastern Yidun Arc, SW China, is located in the middle of the Garze–Litang suture zone and has an outcrop area of ∼2800 km2. In the present study, we report zircon U–Pb ages and elemental and Sr–Nd–Hf isotopic data for the Daocheng granitic intrusion. Secondary ion mass spectrometry and laser ablation inductively coupled plasma mass spectrometry U–Pb analyses on zircons yield consistent ages of ca. 216 Ma for three samples from the pluton. All the Daocheng granitic rocks are enriched in Si (SiO2 = 68.1–76.4%) and large-ion lithophile elements but depleted in high-field-strength elements (e.g., Nb, Ta, and Ti). Mineralogical and geochemical features indicate that these are high-K and calc-alkaline and I-type granites. They are characterized by relatively variable initial 87Sr/86Sr ratios (0.7059–0.7102), negative εNd(t) values (−5.7 to −7.8), wide-ranging εHf(t) values (−9.8 to +3.4), and two-stage Hf model ages of 1.04 to 1.88 Ga. These isotopic signatures indicate that the source for the Daocheng granite was probably derived from partial melting of a Late Paleoproterozoic to Early Mesoproterozoic mafic–intermediate lower crust with a variably minor addition (<20%) of depleted mantle-derived magma. The parental magma thereafter underwent extensive fractional crystallization of ferromagnesian minerals, plagioclase, apatite, ilmenite, and rutile during emplacement, under temperatures from 785 °C to 839 °C. In combination with previous studies on synchronous magmatism in the Yidun Arc, we propose that the Daocheng granite was generated in a syncollisional tectonic setting. The westward subduction and closure of the Garze–Litang paleo-ocean triggered the underplating of large-scale mantle-derived magma and provided heat for the anatexis of the lower crust. Hybrid melts including minor depleted mantle-derived magma and lower crustal magma were then generated; these thereafter were continuously injected into a shallow-level chamber and gave rise to the Daocheng granite.

KeywordLate Triassic yidun Arc daocheng Granite zircon U–pb Ages geochemistry sr–nd–hf Isotopes
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9396
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 46 Guanshui Road, Guiyang 550002, China
2.Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation
GB/T 7714
De-Feng He,Wei-Guang Zhu,Hong Zhong,等. Zircon U–Pb geochronology and elemental and Sr–Nd–Hf isotopic geochemistry of the Daocheng granitic pluton from the Yidun Arc, SW China[J]. Journal of Asian Earth Sciences,2013,67–68:1-17.
APA De-Feng He,Wei-Guang Zhu,Hong Zhong,Tao Ren,Zhong-Jie Bai,&Hong-Peng Fan.(2013).Zircon U–Pb geochronology and elemental and Sr–Nd–Hf isotopic geochemistry of the Daocheng granitic pluton from the Yidun Arc, SW China.Journal of Asian Earth Sciences,67–68,1-17.
MLA De-Feng He,et al."Zircon U–Pb geochronology and elemental and Sr–Nd–Hf isotopic geochemistry of the Daocheng granitic pluton from the Yidun Arc, SW China".Journal of Asian Earth Sciences 67–68(2013):1-17.
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