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Revisiting the new classification of granitic rocks based on whole-rock Sr and Yb contents: Index
Zhang Qi1; Jin WeiJun1; Li ChengDong2; Wang YuanLong1
2010-04-01
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume26Issue:4Pages:985-1015
SubtypeArticle
AbstractIn our previous study, based on the values of Sr = 400 x 10(-6) and Yb = 2 x 10(-6) the granites are divided into five types; i.e., Adakite, Himalaya-type, Zhemin-type, Guangxi-type and Nanling-type granites(Sr < 100 x 10(-6) and Yb > 2 x 10(-6)) separated from Zhemin-type (Zhang et al., 2006a). The values of Sr = 400 x 10(-6) and Yb = 2 x 10(-6) were originally defined according to the data of Adak Island in Aleutian Islands. In this study, A total of 6289 granite data (Adak-type granite; 2810; Himalaya-type; 636; Zhemin-type; 1183; Nanling-type; 1518; Guangxi-type: 142) are collected and the geochemical characteristics for each of the types are summarized as follows. (1) Adak-type granite is rich in Al2O3 and Sr and poor in Y and Yb with relatively high and variable Eu anomaly. Most samples have Sr > 300 x 10(-6), Yb < 2.5 x 10(-6)(Yb is higher than 2 x 10(-6) when Sr = 400 x 10(-6) similar to 600 x 10(-6) and lower than 2 x 10(-6) when Sr > 600 x 10(-6)) Al2O5 14% similar to 18% and Eu/Eu* 0.6 similar to 1.2; (2) Himalaya-type granite is poor in Sr and Yb with medium Al2O3 and variable Eu/Eu*. Sr < 300 x 10(-6) Yb < 2 x 10(-6) (a few samples having Sr > 300 x 10(-6)) Al2O3 13% similar to 17% and Eu/Eu* 0.2 similar to 1.0; (3) Zhemin-type granite is rich in Yb and poor in Sr with Sr between 40 x 10(-6) and 400 x 10(-6) and Yb > 1.5 x 10(-6). Al2O3 and Eu/Eu* are similar to that of Himalaya-type; Al2O3 12% similar to 17% and Eu/Eu* 0.4 similar to 1.0; (4) Nanling-type granite is different from the former three with quite low Sr, Al2O3 and Eu/Eu* and fairly high Vb. Generally, Yb > 1.5 x 10(-6), Sr < 100 x 10(-6), Al2O5 < 14% (mostly between 11 similar to 13%), and Eu/Eu* < 0.7 (often under 0.4). The content of Yb is literally variable and mostly above 2 x 10(-6). With Yb between 2 x 10(-6) and 8 x 10(-6), Sr content in some samples is above 100 x 10(-6), but rarely above 200 x 10(-6). This type is characterized by higher Yb content corresponds to lower Sr and very negative Eu anomaly. This paper discussed the siginificance of Sr-Yb classification of granitic rocks and proposed that the classification is suitable for most medium-acidic magmatic rocks forming in continents and oceans, but may not suitable for the granites with very high Fe and K such as Guangxi-type granite. The classification suggests that the variation in the formation pressure of the source rather than the influence of the source composition, temperature, degree of partial melting, water and volatile, and magma mixing. The classification is actually based on the theory of equilibrium between melt and residue phase. The residual phase is plagioclase for the Zhemin-type granite; plagioclase and garnet for the Himalaya-type granite; garnet for the adak-type granite and calcium-rich plagioclase for the Nanling-type granite. It is suggested that the key to deepen the research of granite is to strengthen experimental petrology and combine closely geochronology with geochemistry.
KeywordGranite Classification Sr-yb Content Adak-type Granite Himalaya-type Granite Zhemin-type Granite Nanling-type Granite Pressure
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordA-TYPE GRANITES ; U-PB ZIRCON ; NORTH CHINA CRATON ; NORTHWESTERN JIAODONG PENINSULA ; CARBONIFEROUS VOLCANIC-ROCKS ; SUBDUCTED CONTINENTAL-CRUST ; TRACE-ELEMENT GEOCHEMISTRY ; ADAKITIC INTRUSIVE ROCKS ; LATE TRIASSIC GRANITOIDS ; PORPHYRY COPPER-DEPOSIT
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000277950600001
PublisherSCIENCE PRESS
Citation statistics
Cited Times:42[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/72691
Collection中国科学院地质与地球物理研究所
Corresponding AuthorZhang Qi
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.China Geol Survey, Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang Qi,Jin WeiJun,Li ChengDong,et al. Revisiting the new classification of granitic rocks based on whole-rock Sr and Yb contents: Index[J]. ACTA PETROLOGICA SINICA,2010,26(4):985-1015.
APA Zhang Qi,Jin WeiJun,Li ChengDong,&Wang YuanLong.(2010).Revisiting the new classification of granitic rocks based on whole-rock Sr and Yb contents: Index.ACTA PETROLOGICA SINICA,26(4),985-1015.
MLA Zhang Qi,et al."Revisiting the new classification of granitic rocks based on whole-rock Sr and Yb contents: Index".ACTA PETROLOGICA SINICA 26.4(2010):985-1015.
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