Global Geology 2017, 20(2) 69-79 DOI:   10.3969/j.issn.1673-9736.2017.02.01  ISSN: 1673-9736 CN: 22-1371/P

Current Issue | Archive | Search                                                            [Print]   [Close]
Information and Service
This Article
Supporting info
Service and feedback
Email this article to a colleague
Add to Bookshelf
Add to Citation Manager
Cite This Article
Email Alert
zircon U-Pb dating
tectonic setting
Zongwulong Ocean

Zircon U-Pb geochronology and geochemistry of syenogranitesin western Niubiziliang, northwestern Qaidam, Qinghai

YU Lu1, SUN Fengyue1, LI Bile1, LI Liang1, LI Ruihua2,3, JIANG Hefang1, WANG Fei1, SHAO Ji4, SHEN Dali4

1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. MLR Key Laboratory of Metallogeny and Mineral Resources Assessment, Institute of Mineral Resources, Chinese Academyof Geological Sciences, Beijing 100037, China;
3. School of Earth and Space Sciences, Perking University, Beijing 100871, China;
4. Qinghai Nuclear Industrial Geology Bureau, Xining 810008, China


The study presents the results of U-Pb dating of zircons and whole-rock geochemical analyses of a syenogranite located in the western Niubiziliang area, China with the aim of determining its formation time, petrogenesis and the regional tectonic setting. Zircons within the syenogranite are euhedral-subhedral and display rhythmic growth zoning, indicating a magmatic origin. Zircon U-Pb data obtained by LA-ICP-MS indicate the syenogranite formed in the Late Permian (260.7±1.5 Ma). The w(SiO2) of syenogranites is 70.82%-73.59%, w(Al2O3) is 13.49%-14.82%, and w(Na2O+K2O) is 7.85%-8.52%, and yield K2O/Na2O ratios of 1.06-1.26. Therefore, the syenogranites belong to the high-K calc-alkaline and metaluminous (A/CNK<1, A/NK>1) series which display I-type granites similarly. The syenogranites also show the geochemical characteristics of volcanic arc rocks, being enriched in large-ion lithophile elements (LILEs; K, Rb) and light rare-earth elements (LREEs; La, Ce, Sm, Nd), but depleted in high field strength elements (HFSEs; Ta, Nb, P, Ti). On the whole, trace element ratios are close to the mean of the Earth's crust, indicating a lower-crust magma source. The low Sr (161-214)×10-6 and Yb (1.08-1.80)×10-6 concentrations indicate that plagioclase and hornblende are residual mineral phases in the source. The regional geology and whole-rock geochemistry suggest that the formation of the syenogranites was related to subduction of the Zongwulong Ocean crust, and the north margin of Qaidam Block during the Late Permian was in an active continental margin tectonic setting.

Keywords syenogranite   zircon U-Pb dating   geochemistry   tectonic setting   Zongwulong Ocean   Niubiziliang  
Received 2016-10-21 Revised 2016-11-25 Online:  
DOI: 10.3969/j.issn.1673-9736.2017.02.01
Corresponding Authors: SUN Fengyue,
About author:

Similar articles
1.ZHAO Qingying, LI Chunfeng, WANG Guoliang and LI Xuefei.Chracteristics and formation setting of granodiorite in Zhalute County, Inner Mongolia[J]. Global Geology, 2009,12(3): 156-159
2. SUN Linhua, GUI Herong and CHEN Song.Geochemistry of Neoproterozoic mixosedimentite in northern Anhui and its geological significance[J]. Global Geology, 2010,13(3-4): 128-134
3. HUANG Yongwei, LIU Jiajun and GAO Chen.Geochemistry and metallogenic age of Sishanlinchang gold-silver deposit in Jidong of Heilongjiang[J]. Global Geology, 2011,14(1): 29-43
4. ZHAO Yongyue, WANG Li and YANG Heting.Geochemistry of fluid inclusions from Linglong gold deposit in Shandong,China[J]. Global Geology, 2012,15(1): 26-34
5. WANG Jianguo, HE Zhonghua, CHAO Lin, WU Qing and JIN Ling.Petrogenesis of Early Cretaceous riebeckite granophyres in southern Da Hinggan Mts.[J]. Global Geology, 0,(): 26-34
6. WANG Jianguo, HE Zhonghua*, CHAO Lin, WU Qing and JIN Ling.Petrogenesis of Early Cretaceous riebeckite granophyres in southern Da Hinggan Mts.[J]. Global Geology, 2013,16(1): 26-34
7. ZHANG Shanming1, 2, SUN Huashan2* , ZHU Zhexin1, LIU Hongwei1 and CHI Hongxin.Diagenesis tectonic setting and U-Pb dating for zircon from Tanjianshan Group in northern margin of Qaidam Basin[J]. Global Geology, 2013,16(3): 130-143
8. WANG Wei( RZ) 1, WEI Chunjing2, ZHANG Yinghui2, CHU Hang3.SHRIMP zircon U-Pb dating of a small tonalite intrusion in metamorphic belt of Chinese Altai orogen and its geological implication[J]. Global Geology, 2013,16(4): 184-191
9. ZHAO Dalin1, WANG Dehai1, LV Shicong1, CHEN Chunhu2and ZHAO Yanwei3.Sedimentary environment of Middle Permian Zhesi Formation in Solon area of Inner Mongolia[J]. Global Geology, 2014,17(1): 11-37
10. WU Qing1, YANG Weihong2, HE Zhonghua1*, YANG Deming1, MA Rui1and WANG Jianguo1.Petrogenesis and tectonic setting of granite porphyry in Keyouzhongqi area,Inner Mongolia[J]. Global Geology, 2014,17(1): 24-33
11. KONG Yuanming, MA Rui, HE Zhonghua, YANG Deming, WU Qing and WANG Yang.Characteristics and tectonic setting of volcanic rocks in Early Cretaceous Baiyingaolao Formation of Keyouzhongqi area,Inner Mongolia[J]. Global Geology, 2014,17(2): 78-85
12. YANG Naifeng, YANG Liting and WANG Chunguang.Geochemistry and tectonic significance of Early Cretaceous granites in Highland 1248 of Daxing'anling[J]. Global Geology, 2014,17(2): 86-98
13. ZHANG Rui, CHI Xiaoguo, LIU Jianfeng, ZHAO Yuandong, SUN Wei, PAN Shiyu, QUAN Jingyu, FAN Lefu and WANG Limin .Geochemistry and tectonic significance of volcanic rocks from Qushenla Formation in Gerze area of northern Tibetan Plateau[J]. Global Geology, 2015,18(1): 16-25
14. YUN Xiuyu, HE Zhonghua and YAN Weibing.Geochronology,geochemistry and Hf isotopic study of Early Carboniferous granodiorites in Taerqi region, central Daxing'anling and its tectonic implication[J]. Global Geology, 2015,18(2): 98-108
15. YANG Haotian, SHI Jiangpeng, HUO Tengfei and YANG Donghong .Petrogenesis of Paleoproterozoic diorite porphyries in Luojiazhuang,western Shandong: constraints from LA- ICP- MS zircon U- Pb geochronology and geochemistry[J]. Global Geology, 2016,19(2): 78-84

Copyright by Global Geology