SHRIMP Zircon U-Pb Ages and Geochemical Characteristics of the Neoproterozoic Granitoids in the Huangling Anticline and Its Tectonic Setting

SHRIMP zircon U-Pb dating of the Neoproterozoic Maoping （茅坪） series （Sandouping （三斗坪） rock suite） granites exposed in the southern part of the Huangling （黄陵） anticline shows that the formation time of Sandouping biotite-hornblende tonalite intrusion, Jinpansi （金盘寺） hornblende-biotite tonalite intrus...

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Published inJournal of earth science (Wuhan, China) Vol. 23; no. 5; pp. 659 - 675
Main Author 魏运许 彭松柏 蒋幸福 彭中勤 彭练红 李志宏 周鹏 曾雄伟
Format Journal Article
LanguageEnglish
Published China University of Geosciences China University of Geosciences 01.10.2012
Springer Nature B.V
Subjects
Anticlines
Biogeosciences
Continental margins
Earth and Environmental Science
Earth science
Earth Sciences
Geochemistry
Geology
Geotechnical Engineering & Applied Earth Sciences
Granite
Intrusion
Marine
Oceanic crust
Plate tectonics
Rock
Rock (material)
Rocks
Shellfish
Shrimps
SHRIMP锆石U-Pb定年
SHRIMP锆石U-Pb年龄
Stone
Tectonics
二长花岗岩
地球化学特征
新元古代
构造环境
活动大陆边缘
黄陵背斜
tectonic setting
Yangtze plate
SHRIMP zircon U-Pb dating
geochemistry
Huangling anticline
Neoproterozoic granitoid
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ISSN1674-487X
1867-111X
DOI10.1007/s12583-012-0284-z

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Summary:SHRIMP zircon U-Pb dating of the Neoproterozoic Maoping （茅坪） series （Sandouping （三斗坪） rock suite） granites exposed in the southern part of the Huangling （黄陵） anticline shows that the formation time of Sandouping biotite-hornblende tonalite intrusion, Jinpansi （金盘寺） hornblende-biotite tonalite intrusion, and Longtanping （龙潭坪） monzogranite are 863±9, 842±10, and 844±10 Ma, respectively. Their geochemical features include A/CNK=0.98-1.06, from metaluminous to weakly peraluminous, δ=1.37-1.53, Sm/Nd=0.17-0.24, and RbN/YbN=1.1-3.62. These indicate that the granite rocks are supersaturated SiO2 calc-alkaline granitoids. The characteristic of Sr-Nd isotopic composition is that the values of εNd（t） and εsr（t） are -12.4 to -11.0 and 20.2-32.2, respectively. It also suggests that the material source of the granite rocks mainly originated from the crust, and they formed in a volcanic arc tectonic environment. These facts suggest that the occurrence of Neoproterozoic granitoids in the southern part of the Huangling anticline should be related to an arc environment along an active continental margin caused by southward subduction of oceanic crust beneath the northern Yangtze craton, and the formation age is not later than 863 Ma.
Bibliography:Yunxu Wei,Songbai Peng,Xingfu Jiang,Xiongwei Zeng, Zhongqin Peng,Lianhong Peng,Zhihong Li,Peng Zhou,Xiongwei Zeng（1Wuhan Institute of Geology and Minerals Resources, Wuhan Center of Geological Survey, Wuhan 430205, China;2Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China; Three Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geoseienees, Wuhan 430074, China;3Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;4Wuhan Institute of Geology and Minerals Resources, Wuhan Center of Geological Survey, Wuhan 430205, China）
SHRIMP zircon U-Pb dating of the Neoproterozoic Maoping （茅坪） series （Sandouping （三斗坪） rock suite） granites exposed in the southern part of the Huangling （黄陵） anticline shows that the formation time of Sandouping biotite-hornblende tonalite intrusion, Jinpansi （金盘寺） hornblende-biotite tonalite intrusion, and Longtanping （龙潭坪） monzogranite are 863±9, 842±10, and 844±10 Ma, respectively. Their geochemical features include A/CNK=0.98-1.06, from metaluminous to weakly peraluminous, δ=1.37-1.53, Sm/Nd=0.17-0.24, and RbN/YbN=1.1-3.62. These indicate that the granite rocks are supersaturated SiO2 calc-alkaline granitoids. The characteristic of Sr-Nd isotopic composition is that the values of εNd（t） and εsr（t） are -12.4 to -11.0 and 20.2-32.2, respectively. It also suggests that the material source of the granite rocks mainly originated from the crust, and they formed in a volcanic arc tectonic environment. These facts suggest that the occurrence of Neoproterozoic granitoids in the southern part of the Huangling anticline should be related to an arc environment along an active continental margin caused by southward subduction of oceanic crust beneath the northern Yangtze craton, and the formation age is not later than 863 Ma.
Huangling anticline, Yangtze plate, Neoproterozoic granitoid, SHRIMP zircon U-Pbdating, geochemistry, tectonic setting.
42-1788/P
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ISSN:1674-487X
1867-111X
DOI:10.1007/s12583-012-0284-z