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Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

文献类型：期刊论文

作者Tao JiHua1,2; Li WuXian1; Li XianHua3; Cen Tao1,2
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2013-06-01
卷号56期号:6页码:922-939
关键词highly evolved tetrad effect granite early Yanshanian southern Jiangxi Province
ISSN号1674-7313
DOI10.1007/s11430-013-4593-6
文献子类Article
英文摘要Early Yanshanian (Jurassic) granitoids are widespread in the Nanling Range, South China. Whereas large granitic batholiths commonly crop out in the center of the Nanling Range (corresponding geographically to the central and northern parts of Guangdong Province), many small stocks occur in the southern part of Jiangxi Province. Most of the small stocks are associated closely with economically significant rare-metal deposits (W, Sn, Nb, Ta). Here we report the results for biotite granites and two-mica granites from three Yanshanian stocks of the Longyuanba complex. LA-ICPMS U-Pb dating of zircon yields an age of 156.1 +/- 2.1 Ma for Xiaomubei biotite granite, and U-Pb zircon dating using SIMS yields an age of 156.7 +/- 1.2 Ma for Longyuanba-Chengjiang biotite granite and 156.4 +/- 1.3 Ma for Jiangtoudong two-mica granite. Biotite granites are silica-rich (SiO2=70%-79%), potassic (K2O/Na2O > 1.9), and peraluminous (ASI=1.05-1.33). Associated samples are invariably enriched in Rb, Th, Pb and LREE, yet depleted in Ba, Nb, Sr, P and Ti, and their REE pattern shows a large fractionation between LREE and HREE ((La/Yb)(N)=10.7-13.5) and a pronounced Eu negative anomaly (delta Eu=0.28-0.41). Two-mica granite samples are also silica-rich (SiO2=75%-79%), potassic (K2O/Na2O > 1.2), and peraluminous (ASI=1.09-1.17). However, in contrast to the biotite granites, they are more enriched in Rb, Th, Pb and extremely depleted in Ba, Nb, Sr, P and Ti, and exhibit nearly flat ((La/Yb)(N)=0.75-1.08) chondrite-normalized REE patterns characterized by strong Eu depletion (delta Eu=0.02-0.04) and clear tetrad effect (TE1.3=1.10-1.14). Biotite granites and two-mica granties have comparable Nd isotopic signatures, and their E > Nd(t) are concentrated in the -13.0 to -9.6 and -11.5 to -7.7 respectively. Their zircon Hf-O isotopes of both also show similarity (biotite granites: E > Hf(t)=-10.8--7.9, delta O-18=7.98aEuro degrees aEuro"8.89aEuro degrees and E > Hf(t)= -13.8 to -9.1, delta O-18=8.31aEuro degrees aEuro"10.08aEuro degrees; two-mica granites: E > Hf(t)=-11.3 to -8.0, delta O-18=7.91aEuro degrees aEuro"9.77aEuro degrees). The results show that both biotite and two-mica granites were derived mainly from sedimentary source rocks with a minor contribution from mantle-derived materials. In spite of some S-type characteristics, the biotite granites were formed by fractional crystallization of I-type magma and assimilation of peraluminous sedimentary rocks during their ascent to the surface. Therefore, they belong to highly fractionated I-type granites. Two-mica granites exhibit a tetrad effect in their REE patterns, but share the same isotopic features with the biotite granites, suggesting that they are highly fractionated I-type granites as well. Their Lanthanide tetrad effects may be attributed to the hydrothermal alteration by magmatic fluids that have suffered degassing at late stages. Granitic magmas undergoing fractional crystallization and wall-rock assilimation can generate highly evolved granites with no REE tetrad effect in the uni-phase system. However, in the late-stage of magmatic evolution in the multi-phase system (i.e., magmatic-hydrothermal system), these magmas also can lead to the highly evolved granites exhibiting mew-shaped REE pattern characterized by tetrad effect as the consequence of melt-fluid and fluid-vapor fractionation, and the resultant autometasomatism.
WOS关键词ISOVALENT TRACE-ELEMENTS ; FOLD BELT GRANITOIDS ; LA-ICP-MS ; AQUEOUS SYSTEMS ; NANLING RANGE ; IGNEOUS ROCKS ; REE PATTERNS ; SE CHINA ; TETRAD ; FRACTIONATION
WOS研究方向Geology
语种英语
WOS记录号WOS:000319774000003
出版者SCIENCE PRESS
资助机构Chinese Academy of Sciences(KZCX1-YW-15-2 ; Chinese Academy of Sciences(KZCX1-YW-15-2 ; Ministry of Science and Technology(2007CB411403) ; Ministry of Science and Technology(2007CB411403) ; National Natural Science Foundation of China(40973025 ; National Natural Science Foundation of China(40973025 ; GIGCAS-135-Y234151001) ; GIGCAS-135-Y234151001) ; 41173039) ; 41173039) ; Chinese Academy of Sciences(KZCX1-YW-15-2 ; Chinese Academy of Sciences(KZCX1-YW-15-2 ; Ministry of Science and Technology(2007CB411403) ; Ministry of Science and Technology(2007CB411403) ; National Natural Science Foundation of China(40973025 ; National Natural Science Foundation of China(40973025 ; GIGCAS-135-Y234151001) ; GIGCAS-135-Y234151001) ; 41173039) ; 41173039) ; Chinese Academy of Sciences(KZCX1-YW-15-2 ; Chinese Academy of Sciences(KZCX1-YW-15-2 ; Ministry of Science and Technology(2007CB411403) ; Ministry of Science and Technology(2007CB411403) ; National Natural Science Foundation of China(40973025 ; National Natural Science Foundation of China(40973025 ; GIGCAS-135-Y234151001) ; GIGCAS-135-Y234151001) ; 41173039) ; 41173039) ; Chinese Academy of Sciences(KZCX1-YW-15-2 ; Chinese Academy of Sciences(KZCX1-YW-15-2 ; Ministry of Science and Technology(2007CB411403) ; Ministry of Science and Technology(2007CB411403) ; National Natural Science Foundation of China(40973025 ; National Natural Science Foundation of China(40973025 ; GIGCAS-135-Y234151001) ; GIGCAS-135-Y234151001) ; 41173039) ; 41173039)
源URL[http://ir.iggcas.ac.cn/handle/132A11/86960]  
专题中国科学院地质与地球物理研究所
通讯作者Li WuXian
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Tao JiHua,Li WuXian,Li XianHua,et al. Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry[J]. SCIENCE CHINA-EARTH SCIENCES,2013,56(6):922-939.
APA Tao JiHua,Li WuXian,Li XianHua,&Cen Tao.(2013).Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry.SCIENCE CHINA-EARTH SCIENCES,56(6),922-939.
MLA Tao JiHua,et al."Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry".SCIENCE CHINA-EARTH SCIENCES 56.6(2013):922-939.

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