Zircon U-Pb chronology, geochemistry and geological significance of the Tongjiang-Fuyuan Mesozoic magmatic rocks, NE China

被引：0
|
作者：
Chen, Tao [1 ]
Li, Weimin [1 ,2 ]
Liu, Yongjiang [3 ,4 ]
Feng, Zhiqiang [5 ]
Zhao, Yingli [1 ]
Liu, Tongjun [1 ]
Gao, Jinhui [1 ]
Zheng, Shigang [1 ]
Zhao, Junfeng [1 ]
机构：
[1] Jilin Univ, Coll Earth Sci, Changchun, Peoples R China
[2] Minist Nat Resources, Key Lab Mineral Resources Evaluat Northeast Asia, Changchun, Peoples R China
[3] Ocean Univ China, Inst Adv Ocean Study, Coll Marine Geosci, MOE Key Lab Submarine Geosci & Prospecting Tech, Qingdao, Peoples R China
[4] Laoshan Lab, Lab Marine Mineral Resources, Qingdao 266100, Peoples R China
[5] Taiyuan Univ Technol, Coll Min Engn, Taiyuan, Shanxi, Peoples R China
来源：
GEOLOGICAL MAGAZINE | 2023年 / 160卷 / 09期
关键词：
NE China; Nadanhada Terrane; Mesozoic magmatic rocks; the Palaeo-Pacific plate; subduction and rollback;
D O I：
10.1017/S0016756823000675
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Typical ophiolitic rock assemblages such as siliciclastic rocks, basalts and gabbros, together with the subduction-related intermediate-acidic intrusive rocks, are newly discovered in the Tongjiang-Fuyuan area of the Heilongjiang Provence, NE China. To determine the formation age and genesis of the mafic rocks (basalts and gabbros) and intermediate-acidic intrusive rocks (granodiorites) in the area, as well as their geodynamic settings, the whole-rock geochemical analysis and zircon LA-ICP-MS U-Pb dating were carried out. Zircon U-Pb results suggest that the granodiorites are 93-95 Ma and gabbro is 95 Ma, respectively. Geochemical results show that the gabbros and basalts exhibit characteristics of ocean island basalt (OIB) affinity and are typically related to having originated from mantle plumes. While the granodiorites show the nature of the island-arc magmatic rocks and may originate from the lower crust. Based on the coeval igneous rock associations and regional tectonic evolution, we conclude that the late Cretaceous magmatic rocks in the Tongjiang-Fuyuan area are the product of continuous subduction of the Palaeo-Pacific plate and reflect the subduction rollback process of the Palaeo-Pacific plate.
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收藏
页码：1742 / 1760
页数：19
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