Age and Petrogenesis of the Shuiyuan Granite, Southern Zhuguang Mountain, Northern Guangdong Province

ZHANG Jun-Tao，XIE Xiao-Zhan，YAO Dong-Hong，ZENG Hong-Wei，ZHANG Yue-Yue; ${author.authorNameEn}; ${author.authorNameEn}; ${author.authorNameEn}; ${author.authorNameEn}

doi:10.3969/j.issn.2097-0013.2022.04.003

2022 Vol. 38, No. 4

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ZHANG Jun-Tao，XIE Xiao-Zhan，YAO Dong-Hong，ZENG Hong-Wei，ZHANG Yue-Yue, . 2022. Age and Petrogenesis of the Shuiyuan Granite, Southern Zhuguang Mountain, Northern Guangdong Province. South China Geology, 38(4): 596-613. doi: 10.3969/j.issn.2097-0013.2022.04.003

Citation:

ZHANG Jun-Tao，XIE Xiao-Zhan，YAO Dong-Hong，ZENG Hong-Wei，ZHANG Yue-Yue, . 2022. Age and Petrogenesis of the Shuiyuan Granite, Southern Zhuguang Mountain, Northern Guangdong Province. South China Geology, 38(4): 596-613. doi: 10.3969/j.issn.2097-0013.2022.04.003

Age and Petrogenesis of the Shuiyuan Granite, Southern Zhuguang Mountain, Northern Guangdong Province

ZHANG Jun-Tao，XIE Xiao-Zhan，YAO Dong-Hong，ZENG Hong-Wei，ZHANG Yue-Yue^1,2,
²,
²,
²,
³

1. Research Center for Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey, Wuhan 430205, Hubei, China
2. 291 Brigade, Guangdong Province Nuclear Industry Geological Bureau, Guangzhou 510800, Guangdong, China
3. Research Institute No. 290, China National Nuclear Corporation, Shaoguan 512029, Guangdong, China

Received Date: 01 August 2022

Revised Date: 31 October 2022

Abstract

Abstract

The shuiyuan pluton is located at the southern Zhuguang Mountain. It is mainly composed of fine-grained little-porphyraceous biotite monzogranite, while fine-grained little-porphyraceous two-mica monzogranite and fine-grained two-mica monzogranite are distributed in a small amount. LA-ICP-MS U-Pb zircon analysis yields ²⁰⁶Pb/²³⁸U weighted mean age of (240.6±1.6) Ma，(240.2±1.7) Ma and (240.0±2.9) Ma for the above three rocks, which indicates the shuiyuan pluton formed at the Middle Triassic for magma movement. Geohemical and Sr-Nd-Hf isotopic analyses show that the granites have high SiO₂ (between 68.14% and 70.22%), rich alkali (between 6.59% and 7.50%), high potassium (the value of K₂O/Na₂O above 1) and low FeO, MgO, CaO, TiO₂ and P₂O₅. Aluminum saturation indexes are greater than 1.1 (the value of ACNK ranging from 1.56 to 1.90) and the Littman indexes are less than 3.3（the value of δ ranging from 1.73 to 2.14）. The granites often contain aluminum-rich minerals such as muscovite，which indicates they belong to strong peraluminous granite of high potassium calc alkaline series. The granites are characterized by high total rare earth content, light rare earth enrichment (the value of LREE/HREE ranging from 13.41 to 19.90), and medium negative europium anomaly（δEu ranging from 0.43 to 0.45）.They are enriched in LILEs（Rb, Th, U, K and Pb）, but depleted in Ba and Sr, and lack in HFSEs（Nb, Ta, Ti and Zr）.The granites have the lower value of ε_Nd (t) (between -10.8 and -11.3) and ε_Hf (t) (ranging from -12.5 to -9.4). The second stage model age of Nd and Hf are respectively 1.86-2.02 Ga and 1.86-2.06 Ga. The results of main trace elements and Sr-Nd-Hf isotopic composition analysis indicate that the source material of the shuiyuan pluton generates from the components of the continental crust with high Paleoproterozoic maturity (mainly meta argillaceous rocks with little greywacke), which is obviously different from the characteristics of I-type and A-type granites and belongs to S-type granite. Combined with the analysis of diagenetic temperature and pressure conditions and the background of regional geological tectonic evolution, this paper believes that the shuiyuan pluton is formed by partial melting of the ancient crustal components in the tectonic transition stage from collision thickening to extension thinning through heating and decompression.
- S-type granite /
- zircon U-Pb geochronology /
- Sr-Nd-Hf isotopes /
- petrogenesis /
- Shuiyuan pluton /
- Southern Zhuguang Mountain

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References

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