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Early Permian A-type Granites in the Zhangdaqi Area, Inner Mongolia, China and Their Tectonic Implications
Alternative TitleEarly Permian A-type Granites in the Zhangdaqi Area, Inner Mongolia, China and Their Tectonic Implications
Zhang Li1; Liu Yongjiang3; Shao Jun2; Li Weimin1; Liang Chenyue1; Chang Ruihong1; Yang Hongzhi2; Feng Zhiqiang4; Zhang Chao2; Xu Jia2; Shi Yi2; Yang Fan2; He Pengfei2
2019
Source PublicationACTA GEOLOGICA SINICA-ENGLISH EDITION
ISSN1000-9515
Volume93Issue:5Pages:1300-1316
AbstractThere is a controversy regarding the amalgamation of Xing'an and Songnen Blocks along the Hegenshan-Heihe Suture (HHS) in the eastern Central Asian Orogenic Belt (CAOB). To solve this problem, we performed detailed study on the granites from the Zhangdaqi area, adjacent to the north of the HHS in the northern part of the Great Xing'an Range, NE China. Geochemically, the granites in the study area are metaluminous-weak peraluminous and high-K calc-alkaline series. Trace elements of the granites show that LREEs are relatively enriched, while HREEs are relatively deficient and obvious REE fractionation. The granites are characterized by obvious negative Eu anomalies, meanwhile, they are relatively enriched in Rb, K, Th and depleted in Ba, Nb, Sr, P, Ti. All the geochemical features suggest that the granites in the Zhangdaqi area are aluminum A-type granites. The zircon LA-ICP-MS U-Pb ages of these granites are 294-298 Ma, indicating that they formed in the Early Permian. These granites also have positive epsilon(Hf) (t) values (8.4-14.2) and a relatively young two-stage model age between 449 Ma and 977 Ma, implying that the magma was derived from the re-melting of the Early Paleozoic-Neoproterozoic juvenile crust. Combined with geochemical characteristics (Nb/Ta ratios of 9.0-22.2, and Zr/Hf ratios of 52.3-152.0), we believe that the magmatic source area is a mixture of partial melting of the lower crust and depleted mantle. A-type granites and bimodal volcanic rocks along the Hegenshan-Heihe Suture formed during the Late Carboniferous-Early Permian, indicating that the HHS between Xing'an and Songnen Blocks closed in the late Early-Carboniferous. Subsequently, the Zhangdaqi area was in a post-orogenic extensional environment from Late Carboniferous to Early Permian and resulted in the formation of the A-type granites.
Other AbstractThere is a controversy regarding the amalgamation of Xing’an and Songnen Blocks along the Hegenshan-Heihe Suture (HHS) in the eastern Central Asian Orogenic Belt (CAOB). To solve this problem, we performed detailed study on the granites from the Zhangdaqi area, adjacent to the north of the HHS in the northern part of the Great Xing’an Range, NE China. Geochemically, the granites in the study area are metaluminous-weak peraluminous and high-K calc-alkaline series. Trace elements of the granites show that LREEs are relatively enriched, while HREEs are relatively deficient and obvious REE fractionation. The granites are characterized by obvious negative Eu anomalies, meanwhile, they are relatively enriched in Rb, K, Th and depleted in Ba, Nb, Sr, P, Ti. All the geochemical features suggest that the granites in the Zhangdaqi area are aluminum A-type granites. The zircon LA-ICP-MS U-Pb ages of these granites are 294–298 Ma, indicating that they formed in the Early Permian. These granites also have positive εHf (t) values (8.4–14.2) and a relatively young two-stage model age between 449 Ma and 977 Ma, implying that the magma was derived from the re-melting of the Early Paleozoic-Neoproterozoic juvenile crust. Combined with geochemical characteristics (Nb/Ta ratios of 9.0–22.2, and Zr/Hf ratios of 52.3–152.0), we believe that the magmatic source area is a mixture of partial melting of the lower crust and depleted mantle. A-type granites and bimodal volcanic rocks along the Hegenshan-Heihe Suture formed during the Late Carboniferous-Early Permian, indicating that the HHS between Xing’an and Songnen Blocks closed in the late Early- Carboniferous. Subsequently, the Zhangdaqi area was in a post-orogenic extensional environment from Late Carboniferous to Early Permian and resulted in the formation of the A-type granites.
KeywordIN-SITU ANALYSIS LA-ICP-MS U-PB ISOTOPIC COMPOSITION EMPLACEMENT AGE VOLCANIC-ROCKS CRUSTAL GROWTH JUNGGAR BASIN OROGENIC BELT LU-HF Central Asian Orogenic Belt Hegenshan-Heihe Suture A-type granites zircon U-Pb age Lu-Hf isotopic NE China
Indexed ByCSCD
Language英语
Funding Project[China Geological Survey Project] ; [National Key Research and Development Program] ; [Qingdao Leading innovation talents project]
CSCD IDCSCD:6591830
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/149402
Collection中国科学院金属研究所
Affiliation1.吉林大学
2.中国科学院金属研究所
3.黑龙江省环境保护科学研究院
4.太原学院
Recommended Citation
GB/T 7714
Zhang Li,Liu Yongjiang,Shao Jun,et al. Early Permian A-type Granites in the Zhangdaqi Area, Inner Mongolia, China and Their Tectonic Implications[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2019,93(5):1300-1316.
APA Zhang Li.,Liu Yongjiang.,Shao Jun.,Li Weimin.,Liang Chenyue.,...&He Pengfei.(2019).Early Permian A-type Granites in the Zhangdaqi Area, Inner Mongolia, China and Their Tectonic Implications.ACTA GEOLOGICA SINICA-ENGLISH EDITION,93(5),1300-1316.
MLA Zhang Li,et al."Early Permian A-type Granites in the Zhangdaqi Area, Inner Mongolia, China and Their Tectonic Implications".ACTA GEOLOGICA SINICA-ENGLISH EDITION 93.5(2019):1300-1316.
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