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Geochronology and geochemistry of the five magmatic rocks in the Ningzhen region, China
Shunfu Lu;  Xiaoqing Zhu;  Xiaofen Li
2019
Source PublicationActa Geochimica
Volume38Issue:2Pages:241-261
Abstract

The Ningzhen region of China is located in the easternmost part of the middle-lower Yangtze River Cu–Fe polymetallic metallogenic belt. From west to east, it comprises five main intermediate–acidic intrusive complexes: the Qilinmen, Anjishan, Xiashu–Gaozi, Shima, and Jianbi complexes. Geochemical investigations show that these five intrusive complexes exhibit high contents of SiO2, at 64.74–73.40 wt%, Al2O3, at 14.15–17.37 wt%, and K2O + Na2O, at 6.49–8.68 wt%. The majority of the samples belong to the high-K calc-alkaline series, with a few samples plotting in the calc-alkaline and tholeiitic series. Trace element analysis shows that the samples are enriched in large ion lithophile elements (LILE) and are depleted in high field strength elements (HFSE). The chondrite-normalized rare earth element (REE) patterns are characterized by right-inclined curves, showing light rare earth element (LREE) enrichment. In addition, the (La/Yb)N ratios are high at 15.02–37.28, with an average of 29.13, and slightly negative or none Eu anomalies are present. In the (La/Yb)N–δEu diagram, the samples plot within the crust-mantle type field. Laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) zircon U–Pb dating yielded ages of 122.0 ± 1.0 Ma, 106.1 ± 0.8 Ma, 108.7 ± 1.4 Ma, 103.5 ± 1.9 Ma, and 96.8 ± 1.7 Ma for the Qilinmen, Anjishan, Xiashu–Gaozi, Shima, and Jianbi complexes, respectively. On the basis of this research and knowledge of several known metal deposits related to these complexes, we suggest that the Mesozoic large-scale diagenesis and metallogenesis in the Ningzhen region may have ceased at 100 Ma or about 95 Ma.

KeywordIntermediate–acidic Intrusive Complexes la– Icp–ms Zircon u–pb Dating geochemistry geodynamic Setting ningzhen Region
Indexed ByEI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10236
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, Guiyang 550081, Guizhou, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Earthquake Administration of Hubei Province, Wuhan 430071, Hubei, China
Recommended Citation
GB/T 7714
Shunfu Lu;Xiaoqing Zhu;Xiaofen Li. Geochronology and geochemistry of the five magmatic rocks in the Ningzhen region, China[J]. Acta Geochimica,2019,38(2):241-261.
APA Shunfu Lu;Xiaoqing Zhu;Xiaofen Li.(2019).Geochronology and geochemistry of the five magmatic rocks in the Ningzhen region, China.Acta Geochimica,38(2),241-261.
MLA Shunfu Lu;Xiaoqing Zhu;Xiaofen Li."Geochronology and geochemistry of the five magmatic rocks in the Ningzhen region, China".Acta Geochimica 38.2(2019):241-261.
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