Zircon U-Pb Geochronology, Geochemistry and Hf Isotopic Composition of the Quartz Monzonite Porphyry Intrusion from East Jilin Province

被引：0
|
作者：
Ye L. [1 ]
Sun F. [1 ]
Wang L. [1 ]
Liu J. [2 ]
Zhang Y. [1 ]
机构：
[1] College of Earth Sciences, Jilin University, Changchun
[2] Shenyang Center, China Geological Survey, Shenyang
来源：
Sun, Fengyue (sfy@jlu.edu.cn) | 1600年 / China University of Geosciences卷 / 45期
关键词：
Geochemistry; Hf isotope; Quartz monzonite porphyry; Zircon U-Pb dating;
D O I：
10.3799/dqkx.2019.173
中图分类号：
学科分类号：
摘要：
The distribution of Jurassic granite in the eastern Jilin province is relatively limited, with little discriminant evidence for regional tectonic evolution. This paper presents a synthesis study of zircon U-Pb chronology and geochemistry and Hf isotopes of the quartz monzonite porphyry in this area. The rocks yield an average zircon LA-ICP-MS U-Pb age of 165±1 Ma, indicating the Middle Jurassic. They show high SiO2(61.01%-61.99%), ALK(5.78%-7.98%), belonging to calc-alkaline granites. In addition, they also display the characteristics of I-type granite with obvious enrichment in LREE, unconspicuous europium anomalies (0.92-1.01), low MgO, CaO, Fe2O3Tas well as A/CNK(1.02-1.39). The Eu/Eu* values vary from -15.46 to -17.04, and TDM2=2 189-2 289 Ma. These samples are enriched in LILE and depleted in HFSE, with Mg#=26.90-33.04, low Yb(0.43×10-6~0.48×10-6) and Y(6.63×10-6~7.12×10-6). Zircon Ti temperature averages 744 ℃, belonging to low temperature granite. The magma was originated from the partial melting of Paleo-Proterozoic lower crust. The middle Jurassic igneous rocks in the eastpartofnorthern margin of the North China Craton were formed in the subduction rather than the remote effect of Mongols-Okhotsk Ocean closure. From late Jurassic to early Cretaceous, the continental margin of northeast China maydisplay the structural features of strike-slip. © 2020, Editorial Department of Earth Science. All right reserved.
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页码：1544 / 1555
页数：11
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