辽东岫岩王家堡子地区二长花岗岩U-Pb年代学、地球化学特征及其地质意义

doi:10.13278/j.cnki.jjuese.20190174

Abstract

Abstract: According to the U-Pb geochronology and geochemical characteristics of the monzonitic granite of Longtangou pluton and Luoquangou pluton in Wangjiabaozi area of Xiuyan, Liaodong Peninsula in the middle of Jiao-Liao-Ji orogenic active zone, we carried out a research. The results show that the emplacement ages of Longtangou pluton and Luoquangou pluton are (122.37±0.30) Ma and (124.37±0.91) Ma respectively, both in Early Cretaceous. According to the mass fraction of high SiO₂, low Mg, Co, Cr, and Ni, enrichment of LREE and LILE, and loss of HFSE,Longtangou and Luoquangou plutons are the products of crustal material melting. According to the mass fraction of high Al₂O₃ and K₂O, low Na₂O, MnO, and CaO, high Sr, low Y and Yb, enrichment of LILE and LREE, negative anomalies of Eu, and depletion of HREE, the monzonitic granite possesses the properties of adakite and high potassium calc-alkaline type I granite. The magma of Longtangou pluton was resulted from the partial melting of the base rock at the bottom of the thickened continental crust caused by the subduction of the oceanic crust, while the magma of Luoquangou pluton was the result of the upwelling of mantle material caused by the subduction of the oceanic crust, which led to the partially melting of the lower basalt and mixing with mantle peridotite. The research shows that both Longtangou and Luoquangou plutons are the products of collision environment caused by the subduction of the ancient Pacific plate at the age of 124-122 Ma. The transition from tectonic extrusion to tensile environment should be completed between 122-110 Ma. The lithospheric thinning and destruction began with the transformation.

Key words: Early Cretaceous, granite, zircon U-Pb dating, geochemistry, tectonic transformation, Wangjiabaozi area of Xiuyan,Liaodong Peninsula

CLC Number:

P588.12

Dong Yang, Liu Su, Zhang Sijia. U-Pb Geochronology, Geochemistry and Geological Significance of Early Cretaceous Monzonitic in Wangjiabaozi Area of Xiuyan, Liaodong Peninsula[J].Journal of Jilin University(Earth Science Edition), 2020, 50(6): 1720-1736.

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U-Pb Geochronology, Geochemistry and Geological Significance of Early Cretaceous Monzonitic in Wangjiabaozi Area of Xiuyan, Liaodong Peninsula

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[5]	Zhao Yayun, Liu Xiaofeng, Liu Yuanchao, Ci Qiong, Zheng Changyun, Yang Chunsi, Li Li, Fu Hailong. Petrogenesis and Metallogenic Implication of Ore-Bearing Rock Mass of Copper Polymetallic Ore Occurrence in Duorenze-Sangaka Area, Angren County, Tibet [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1323-1339.
[6]	Yu Zhendong, Xiang Xinkui, Tan Rong, Sun Deming, Zhang Si. Zircon U-Pb Chronology, Geochemistry and Geological Significance of Coarse Muscovite Granite in Pingmiao Mining Area of Dahutang, North Jiangxi [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1505-1517.
[7]	Fan Feipeng, Xiao Huiliang, Chen Lezhu, Li Haili, Liu Jianxiong, Deng Zhonglin, Kang Congxuan, Lin Gengwei, Chen Kai. Zircon U-Pb Age and Hf Isotope of Multiple-Stage Magmatism and Mineralization in Lianhuashan Region, Eastern Guangdong [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1462-1490.
[8]	Fan Yuanyuan, Liu Yunhua, Yu Xiaofei, Zhao Qiang, Li Xiaoyan, Deng Nan, Ma Yuanhao. Geochemical Characteristics and Genesis of Jinkengzi Gold Deposit in Wudu Area, Gansu Province [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1404-1417.
[9]	Xiong Guangqiang, Liu Min, Zhang Da, Wang Zhong. Geochemistry and Geochronology of Gabbro in Diyanmiao Ophiolite Belt, West Ujimqin Banner, Inner Mongolia [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1599-1614.
[10]	Yu Changsheng, Yang Yanchen, Han Shijiong, Yang Kunlin, Song Zhaoyang, Zhang Yihang, Wang Wang. Petrogenesis of Moyite from Xiagalaiaoyi Pb-Zn Deposit in Great Xing’an Range and Its Geological Significance [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(4): 1042-1058.
[11]	Ren Wenkai, Wang Shengyun, Chen Libiao, Wu Shaofeng, Zhang Haiqing. LA-ICP-MS Zicon U-Pb Geochronology, Geochemistry and Geological Significance of Granodiorites in Lancai Area, Tongren, Qinghai [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(4): 1059-1074.
[12]	Ge Hailong, Zhang Yan, Wang Shengzhu, Yang Kaikai, Liu Xiaokang, Bian Weihua. Zircon U-Pb Age, Geochemical Characteristics and Tectonic Settings of Volcanic Rocks in Jimunai Formation,West Junggar Basin [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(4): 1075-1089.
[13]	Ren Yunsheng, Liu Xiaohe, Shang Qingqing, Chen Cong, Yang Qun, Hao Yujie, Sun Zhenming. Geochemistry and Geochronology of Ore-Bearing Formation in Jinan BIF-Type Iron Deposit in Helong Area, Jilin Province [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(3): 800-814.
[14]	Cai Yongfeng, Liu Fenglei, Feng Zuohai, Zhou Yun, Zeng Changyu. Mineral Compositional and Chronological Characteristics of Guposhan Pluton in Guangxi and Its Petrogenetic and Metallogenic Significance [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(3): 842-856.
[15]	He Zhonghua, Wang Qizhi, Wang Qiang. Geochemistry and Zircon U-Pb Ages of Clastic Rocks of Zhesi Formation in Suolun Region, Great Xing’an Range: Constraints on Origins of Sediment Provenance [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 405-424.