[an error occurred while processing this directive] Global Geology 2020, 23(1) 1-15 DOI:   10.3969/j.issn.1673-9736.2020.01.01  ISSN: 1673-9736 CN: 22-1371/P
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volcanic rocks
Niangniangshan Formation
zircon U-Pb age
geochemistry
oceanic ridge subduction
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Geochronology, geochemistry and geological significance ofEarly Cretaceous volcanic rocks from Niangniangshan Formation,Ningwu Basin, middle and lower reaches of the Yangtze River
PING Zhilan1, WANG Li1, ZHANG Yajing1, XIN Wei1, LI Liang2, QIAN Lingyu3
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. School of Resource Environment and Earth Science, Yunnan University, Kunming 650500, China;
3. The First Geological Brigade, Jiangsu Bureau of Geology and Mineral Exploration, Nanjing 210041, China
摘要： Ningwu Basin is one of the Mesozoic continental volcanic basins in the middle and lower reaches of the Yangtze River. The volcanic rocks of the Longwangshan, dawangshan, Gushan and Niangniangshan formations, as well as the homologous subvolcanic rocks or small intrusions, are developed from old to new in the Ningwu Basin. Zircon U-Pb dating results show the latialite phonolite of Niangniangshan Formation was erupted at 128±1 Ma (i.e., Early Cretaceous). The latialite phonolite contains moderate SiO2 contents (57.28%-60.96%) with high Na2O + K2O contents, belonging to shoshonite series. The samples have high REE contents, and display right-inclined REE distribution pattern. They are characterized by enrichment in some large ion lithophile elements (e.g., LILEs, Rb, K), and depletion in some high field strength elements (e.g., HFSEs, Nb, Ta, Ti). All volcanic samples have relatively depleted Nd isotopic compositions (ISr =0.707 197—-0.707 878; εNd(t)=-0.5—-0.9), indicating no genetic relationship with the lower crust of Yangtze plate, but a drift trend towards the EMII. The geochemical data suggest that the Early Cretaceous latialite phonolite was derived from the partial melting of an enriched lithospheric mantle metasomatized by subduction-related fluids in an arc-related setting. Based on the temporal and spatial distribution and geochemical variation characteristics of the regional volcanic rocks, it is suggested that the tectonic system within the study area changed from a subduction-related compression to an extensional environment in the early Early Cretaceous, which was caused by the ridge subduction of the Paleo-Pacific Ocean.
关键词： volcanic rocks   Niangniangshan Formation   zircon U-Pb age   geochemistry   oceanic ridge subduction  
Geochronology, geochemistry and geological significance ofEarly Cretaceous volcanic rocks from Niangniangshan Formation,Ningwu Basin, middle and lower reaches of the Yangtze River
PING Zhilan1, WANG Li1, ZHANG Yajing1, XIN Wei1, LI Liang2, QIAN Lingyu3
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. School of Resource Environment and Earth Science, Yunnan University, Kunming 650500, China;
3. The First Geological Brigade, Jiangsu Bureau of Geology and Mineral Exploration, Nanjing 210041, China
Abstract: Ningwu Basin is one of the Mesozoic continental volcanic basins in the middle and lower reaches of the Yangtze River. The volcanic rocks of the Longwangshan, dawangshan, Gushan and Niangniangshan formations, as well as the homologous subvolcanic rocks or small intrusions, are developed from old to new in the Ningwu Basin. Zircon U-Pb dating results show the latialite phonolite of Niangniangshan Formation was erupted at 128±1 Ma (i.e., Early Cretaceous). The latialite phonolite contains moderate SiO2 contents (57.28%-60.96%) with high Na2O + K2O contents, belonging to shoshonite series. The samples have high REE contents, and display right-inclined REE distribution pattern. They are characterized by enrichment in some large ion lithophile elements (e.g., LILEs, Rb, K), and depletion in some high field strength elements (e.g., HFSEs, Nb, Ta, Ti). All volcanic samples have relatively depleted Nd isotopic compositions (ISr =0.707 197—-0.707 878; εNd(t)=-0.5—-0.9), indicating no genetic relationship with the lower crust of Yangtze plate, but a drift trend towards the EMII. The geochemical data suggest that the Early Cretaceous latialite phonolite was derived from the partial melting of an enriched lithospheric mantle metasomatized by subduction-related fluids in an arc-related setting. Based on the temporal and spatial distribution and geochemical variation characteristics of the regional volcanic rocks, it is suggested that the tectonic system within the study area changed from a subduction-related compression to an extensional environment in the early Early Cretaceous, which was caused by the ridge subduction of the Paleo-Pacific Ocean.
Keywords: volcanic rocks   Niangniangshan Formation   zircon U-Pb age   geochemistry   oceanic ridge subduction  
收稿日期 2019-10-29 修回日期 2019-11-20 网络版发布日期  
DOI: 10.3969/j.issn.1673-9736.2020.01.01
基金项目:

Supported by Project of China Geological Survey (No.1212011220679)

通讯作者: WANG Li
作者简介:
作者Email: wang_l@jlu.edu.cn
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