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A geochemical and geochronological study of the Early Cretaceous, extension-related Honggong ferroan (A-type) granite in southwestern Zhejiang Province, southeast China

Published online by Cambridge University Press:  27 September 2016

XILIN ZHAO ,
YANG JIANG ,
GUANGFU XING ,
ZHIHONG CHEN ,
KAI LIU ,
MINGGANG YU  and
SHENGYAO YU
XILIN ZHAO
Affiliation:
Nanjing Centre, China Geological Survey, Nanjing 210016, China
YANG JIANG
Affiliation:
Nanjing Centre, China Geological Survey, Nanjing 210016, China
GUANGFU XING*
Affiliation:
Nanjing Centre, China Geological Survey, Nanjing 210016, China
ZHIHONG CHEN*
Affiliation:
Nanjing Centre, China Geological Survey, Nanjing 210016, China
KAI LIU
Affiliation:
Nanjing Centre, China Geological Survey, Nanjing 210016, China
MINGGANG YU
Affiliation:
Nanjing Centre, China Geological Survey, Nanjing 210016, China
SHENGYAO YU
Affiliation:
College of Marine Geosciences, Ocean University of China, Qingdao 266100, Shandong, China
*
†Author for correspondence: njxgfu@163.com and Zhihong_chen@126.com
†Author for correspondence: njxgfu@163.com and Zhihong_chen@126.com
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Abstract

The Honggong pluton is the largest ferroan alkalic (A-type) granite intrusion emplaced along the Jiangshan–Shaoxing fault zone in southwestern Zhejiang Province, and has important implications for understanding the Late Mesozoic tectonic evolution of SE China. U–Pb ages of 138.7 ± 0.8, 134.2 ± 1.1, 128.5 ± 1.5 and 126.1 ± 0.9 Ma were obtained from zircon by laser ablation–inductively coupled plasma–mass spectrometry, indicating that the Honggong pluton formed in the Early Cretaceous. The Honggong pluton has a clear ferroan alkalic (A-type) granite geochemical signature with, for example, high total alkali contents and FeOt/(FeOt + MgO) values. The Sr–Nd–Hf isotopic compositions suggest that there was juvenile material in the magma source. Geochemical evidence indicates that the pluton was derived through extensive fractionation of melts that contained both asthenospheric mantle and Mesoproterozoic crustal components. These rare granites in southern China were emplaced during five episodes at 235–225, 190, 165–155, 100–90 and 140–120 Ma. The age of the Honggong pluton suggests that localized extension in southwestern Zhejiang Province began as early as ~138 Ma and continued to 126 Ma. This Early Cretaceous extensional event was triggered by localized rollback of the subducting Pacific Plate.

Keywords

ferroan alkali graniteHonggong plutonZhejiangPacific Plateextensionsoutheast China
Type
Original Articles
Information
Geological Magazine , Volume 155 , Issue 3 , March 2018 , pp. 549 - 567
Copyright
Copyright © Cambridge University Press 2016 

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