Zircon U-Pb Geochronology, Geochemistry, and Sr-Nd Isotopes of Shuangkoushan Quartz-syenite, Northern Qaidam, China

被引：0
|
作者：
Cai P. [1 ]
Zhang Y. [1 ,2 ]
Xu R. [1 ]
Zheng Y. [1 ,3 ]
Guo X. [1 ]
Chen X. [3 ]
机构：
[1] Institute of Geological Survey, China University of Geosciences, Wuhan, 430074, Hubei
[2] Chongqing Institute of Geology and Mineral Resources, Chongqing
[3] The Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074, Hubei
来源：
Geotectonica et Metallogenia | 2019年 / 43卷 / 02期
关键词：
A-type granite; Geochemistry; Northern Qaidam; Shuangkoushan; Sr-Nd isotopes; Zircon U-Pb dating;
D O I：
10.16539/j.ddgzyckx.2019.02.011
中图分类号：
学科分类号：
摘要：
The Shuangkoushan quartz-syenite is situated in the west segment of Northern Qaidam. This paper reports results of LA-ICP-MS zircon U-Pb dating, whole-rock geochemical and Sr-Nd isotopic analyses of the quartz syenite. Geochemically, the Shuangkoushan quartz-syenite shows enrichment in silicon (SiO 2 = 59.47% - 68.66%) and total alkali (Na 2 O + K 2 O = 11.18% - 14.04%), and depletion in CaO (0.31% - 3.30%). The quartz-syenite belongs to peraluminous (σ = 4.87 - 9.55) and shoshonitic series (A/CNK = 1.12 - 1.36). The samples of quartz-syenite are rich in ΣREE (231.31×10 -6 - 569.26×10 -6 ) with negative Eu anomalies (Eu/Eu* = 0.72 - 0.95) and (La/Yb) N values of 24 - 58. The quartz-syenite is characterized by enrichment of LILEs and HFSEs such as LREE, Rb, Th, U, Zr, Nb, Y and Ga and depletion of Ba, Sr, Ti and P. The trace element signatures indicate that the Shuangkoushan quartz-syenite is A-type granite. LA-ICP-MS zircon U-Pb dating shows that it was emplaced at 243.5±1.6 Ma. The ε Nd (t) values (-1.08 to -2.15) and t DM2 (1.10 to 1.19 Ga) of the Shuangkoushan quartz-syenite indicate a magma mixing origin, i.e., the parant magma was likely mixture of melts of the Meso-Neo-Proterozoic metamorphic basement and lithosphere mantle that affected by subduction components. In conclusion, the Shuangkoushan A-type granite (A 1 ) was related to the thickening and stretching of post arc, which caused by the northward subduction of the Paleo-Tethys Ocean during Triassic period. © 2019, Science Press. All right reserved.
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页码：322 / 338
页数：16
相关论文
共 48 条
  • [1] Belousova E., Griffin W., O'Reilly S.Y., Fisher N., Igneous zircon: Trace element composition as an indicator of source rock type, Contributions to Mineralogy and Petrology, 143, 5, pp. 602-622, (2002)
  • [2] Bian Q.T., Li D.H., Pospelov I., Yin L.M., Li H.S., Zhao D.S., Chang C.F., Luo X.Q., Gao S.L., Astrakhantsev O., Age, geochemistry and tectonic setting of Buqingshan ophiolites, north Qinghai-Tibet plateau, China, Journal of Asian Earth Sciences, 23, 4, pp. 577-596, (2004)
  • [3] Bian Q.T., Luo X.Q., Li D.H., Zhao D.S., Chen H.H., Xu G.Z., Chang C.F., Gao Y.L., Discovery of Caledonian island-arc granodiorite-tonalite in Buqingshan, Qinghai Province, Progress in Natural Science, 10, 1, pp. 76-80, (2000)
  • [4] Chen D.L., Liu L., Sun Y., Liou J.G., Geochemistry and zircon U-Pb dating and its implications of the Yukahe HP/UHP Terrane, the North Qaidam, NW China, Journal of Asian Earth Sciences, 35, 3-4, pp. 259-272, (2009)
  • [5] Chen D.L., Liu L., Sun Y., Sun W.D., Zhu X.H., Liu X.M., Guo C.L., Felsic veins within UHP eclogite at Xitieshan in North Qaidam, NW China: Partial melting during exhumation, Lithos, 136-139, 4, pp. 187-200, (2012)
  • [6] Chen X., Xu R.K., Schertl H.P., Zheng Y.Y., Eclogite-Facies Metamorphism in Impure Marble from North Qaidam Orogenic Belt: Geodynamic Implications for Early Paleozoic Continental-Arc Collision, Lithos, 310-311, pp. 201-224, (2018)
  • [7] Chen X., Zheng Y.Y., Xu R.K., Cai P.J., Petrology and Geochemistry of High Niobium Eclogite in the North Qaidam Orogen, Western China: Implications for an Eclogite Facies Metamorphosed Island Arc Slice, Journal of Asian Earth Sciences, 164, pp. 380-397, (2018)
  • [8] Chen X.H., Gehrels G., Yin A., Zhou Q., Huang P.H., Geochemical and Nd-Sr-Pb-O isotopic constrains on Permo-Triassic magmatism in eastern Qaidam basin, northern Qinghai-Tibetan Plateau: Implications for the evolution of the Paleo-Tethys, Journal of Asian Earth Sciences, 114, pp. 674-692, (2015)
  • [9] Chen X.H., Wang X.F., George G., Yang Y., Qin H., Chen Z.L., Yang F., Chen B.L., Li X.Z., Early Paleozoic magmatism and gold mineralization in North Altyn tagh, NW China, Acta Geologica Sinica, 78, 2, pp. 515-523, (2004)
  • [10] Clemens J.D., Holloway J.R., White A.J.R., Origin of an A-type granites: Experimental constrains, American Mineralogist, 71, 3, pp. 317-324, (1986)
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