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Diagenetic age of the intrusions in southern part of the Lu-Zong Basin and its significance

Citation

Fan, Y and Qiu, H and Zhang, L, Diagenetic age of the intrusions in southern part of the Lu-Zong Basin and its significance, Scientia Geologica Sinica, 49, (2) pp. 631-650. ISSN 1004-3543 (2014) [Refereed Article]


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Copyright 2014 Scientia Geologica Sinica

DOI: doi:10.3969/j.issn.0563-5020.2014.02.020

Abstract

LA-ICP MS zircon U-Pb dating for the hidden intrusions; such as Shadun intrusion, Chuanshaoshi intrusion, Qingshan intrusion, Hejiaao intrusion, Meilin intrusion, Gutangchong intrusion, Zhoujiashan intrusion in the south of the Lu-Zong Basin was carried out in this paper. These intrusions consist of alkali-feldspar granite and quartz syenite which contain a lot of K-feldspar. LA-ICP MS zircon U-Pb dating yields the ages of 126.51.1 Ma, 126.21.2 Ma, 126.71.3 Ma, 126.91.4 Ma, 125.91.3 Ma, 126.71.4 Ma, 124.91.3 Ma for five intrusions, respectively. The results indicate that all the hidden intrusions in the south of Lu-Zong Basin formed in the Early Cretaceous. These intrusions are characterized by relative high silica and alkalis, ascribed to metaluminous or peraluminous, moderate REE and strong Eu depletion with a slightly right-inclined sea-gull REE patterns. These data, together with other accuracy dating data of volcanic rocks and intermediate-acid high-K calc-alkalic plutons in the middle and lower reaches of the Yangtze River area, support the intrusions formed in a within-plate tensional tectonic environment. The results of the study are important for discussing the geodynamic settings of these intrusions in the middle and lower reaches of the Yangtze River area.

Item Details

Item Type:Refereed Article
Keywords:Lu-Zong Basin, intrusions, LA-ICPMS zircon U-Pb dating, the middle and lower reaches of the Yangtze River
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geochronology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Iron Ore Exploration
Author:Zhang, L (Mr Lejun Zhang)
ID Code:98469
Year Published:2014
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2015-02-17
Last Modified:2017-11-02
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