Age, Mineral Chemistry, and Geochemistry of Metamorphic Basement Rocks from the Southern Yap Arc, Western Pacific

被引:0
作者
Yan, Shishuai [1 ,2 ,3 ]
Yan, Quanshu [1 ,2 ,3 ,4 ]
Yuan, Long [2 ,3 ]
Ye, Xiantao [1 ]
机构
[1] Hohai Univ, Coll Oceanog, Nanjing 210098, Peoples R China
[2] Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266037, Peoples R China
[3] Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R China
[4] Key Lab Deep Sea Mineral Resources Dev, Qingdao 266061, Peoples R China
基金
国家重点研发计划;
关键词
amphibolite; mineralogy; geochronology; geochemistry; Yap arc; PARECE VELA BASIN; PHILIPPINE SEA; CAROLINE RIDGE; TRENCH; SUBDUCTION; EVOLUTION; ORIGIN; LITHOSPHERE; TECTONICS; BASALTS;
D O I
10.3390/min14101056
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Studying the basement characteristics and tectonic evolution of the proto-Yap Izu-Bonin-Mariana arc system can provide essential clues for understanding the subduction process in the Western Pacific Ocean. The Yap arc is a part of the Izu-Bonin-Mariana (IBM) arc, but the origin and formation time of the metamorphic basement rocks of the Yap arc still need to be determined. In this paper, we present the first systematic and detailed chronological, mineralogical, whole-rock major element and trace element research on metamorphic basement rocks from four stations in the Southern Yap arc and discuss the origin of the metamorphic basement rocks in the Southern Yap arc. The results show that the single mineral U-Pb ages of titanites and 40Ar/39Ar ages of amphiboles in the Southern Yap arc are 19.3 and 19.4 Ma, respectively, which are consistent within the error ranges, and these ages represent the metamorphic age of the basement rocks. The amphibolite is mainly produced via the metamorphism of back-arc basin basalt (BABB) and forearc basalt (FAB). The temperature and pressure conditions of this metamorphism are 446.5-641.6 degrees C and 0.24-0.73 GPa, the facies series of which is the medium P/T series. This study provides important data for understanding the Yap subduction system and the early evolution of the proto-IBM Arc.
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页数:16
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