| Geochemistry and Tectonic Significance of Alkali Granites along the Ulungur River,Xinjiang |
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| 作者姓名： | 韩宝福 洪大卫 |
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| 作者单位： | [1]DepartmentofGeology,PekingUniversity,Beijing100871 [2]ChineseAcademyofGeologicalSciences,Beijing100037 |
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| 摘 要： | In North Xinjiang there is an alkali granite belt extending in the NW-SE direction along the southern band of the Ulungur River and running parallel to the suture zone,i.e.,Aermantai-Zhaheba Ophiolitic Melange Zone ,between the Junggar Plate and the Altay Orogenic Belt.Whole -rock Rb-Sr isochron ages of the Ulungur alkali granites are within the range of 292-309Ma, showing that they were genetically connected with the latest episode of Hercynian magmatism subsequent to the syncollision S-type and post-collision uplifting I-type granitoids in the Altay region .The alkali granites are miner-alogically characterized by the occurrence of aegirine and arfvedsonite and chemically by high silicon and alkali,low calcium and magnesium and abundant high-field elements, being typical A-type granites .The alkali granites were formed in the final stage of the Hercynian calc-alkaline magmatic cycle in a very short period of time .They are in line with the post-orogenic A-type(PA-type)granites, implying that the tectonic regime was changed from compression to extension.
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| 关 键 词： | 碱性花岗岩 新疆 地球化学 A型花岗岩 I型花岗岩 S型花岗岩 |
Geochemistry and tectonic significance of alkali granites along the Ulungur River,Xinjiang |
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| Shiguang Wang,Baofu Han,Dawei Hong,Baoliang Xu,Yayun Sun.Geochemistry and Tectonic Significance of Alkali Granites along the Ulungur River,Xinjiang[J].Chinese Journal of Geochemistry,1995,14(4):323-335. |
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| Authors: | Shiguang Wang Baofu Han Dawei Hong Baoliang Xu Yayun Sun |
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| Institution: | (1) Department of Geology, Peking University, 100871 Beijing;(2) Chinese Academy of Geological Sciences, 100037 Beijing |
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| Abstract: | In North Xinjiang there is an alkali granite belt extending in the NW-SE direction along the southern bank of the Ulungur
River and running parallel to the suture zone, i.e., Aermantai-Zhaheba Ophiolitic Melange Zone, between the Junggar Plate
and the Altay Orogenic Belt. Whole-rock Rb-Sr isochron ages of the Ulungur alkali granites are within the range of 292–309Ma,
showing that they were genetically connected with the latest episode of Hercynian magmatism subsequent to the syncollision
S-type and post-collision uplifting I-type granitoids in the Altay region. The alkali granites are mineralogically characterized
by the occurrence of aegirine and arfvedsonite and chemically by high silicon and alkali, low calcium and magnesium and abundant
high-field elements, being typical A-type granites. The alkali granites were formed in the final stage of the Hercynian calc-alkaline
magmatic cycle in a very short period of time. They are in line with the post-orogenic A-type (PA-type) granites, implying
that the tectonic regime was changed from compression to extension.
This project was financially supported by the National Natural Science Foundation of China. |
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| Keywords: | alkali granite post-orogenic Ulungur River Xinjiang |
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