Tracing mantle sources in the northern Lau back-arc basin by independent component analysis of basalt isotopic compositions | |
Wu, Xichang4,5; Tian, Liyan1,6; Wang, Xuan-Ce2; Chu, Fengyou5; Yan, Quanshu3,6; Sun, Fengyue4; Li, Xiaohu5; Wang, Wei5; Yu, Luyao1; Li, Zhenggang5 | |
刊名 | INTERNATIONAL GEOLOGY REVIEW |
2020-05-23 | |
卷号 | 62期号:7-8页码:938-954 |
关键词 | Lau back-arc basin Sr-Nd-Pb isotopic ratios independent component analysis Samoan mantle plume subduction component |
ISSN号 | 0020-6814 |
DOI | 10.1080/00206814.2018.1561337 |
英文摘要 | The northern Lau back-arc basin (NLB) lavas display a diverse geochemical nature caused by complex geological processes in this region. Independent component (IC) analysis was applied to investigate the nature of mantle sources in the NLB, based on a compiled geochemical data set from the NLB, central-southern Lau Basin (C-SLB), Pacific and Indian Ocean ridges, and Samoan islands. We identified three ICs in the five-dimensional space of Sr-Nd-Pb isotopic ratios, which can account for 96.5% of the isotopic variance. The correlations between the ICs and the incompatible trace elements ratios were further used to examine the origin of these ICs. The first IC (IC1) separates Samoan islands (IC1 < -1) from the other groups, and shows negative correlation with (La/Sm)(N)ratios. The second IC (IC2) discriminates mid-ocean ridge basalts (MORBs) from Pacific (IC2 > 0) and Indian (IC2 < 0) Ocean ridges as well as the C-SLB (IC2 > 0) and NLB (IC2 < 0) lavas. IC2 correlates positively with Ba/Th ratios. The third IC (IC3) distinguishes MORBs (IC3 > 0) and back-arc basin lavas (IC3 < 0), and displays a negative correlation with Th/Nb values. On a regional scale in the NLB, there is a broad increase in IC1, IC2, and IC3 from the north to the south. Only IC3 presents obvious decrease from the west to the east, i.e. with decreasing distance from the arc. The geochemical nature and the statistical properties of these ICs suggest that IC1 is related to an enriched mantle component most likely from the nearby Samoan plume, and the IC2 corresponds to a fluid-rich component from the subducting Pacific slab. The IC3 may represent partial melt of recycled subducted sediment or recycled continental crustal materials. The geographic distribution of three ICs supports that the relatively recent mixing of Samoan plume materials with the subduction-metasomatized back-arc mantle may be responsible for the observed geochemical diversity in NLB lavas. |
WOS关键词 | PRINCIPAL COMPONENT ; CONTINENTAL-CRUST ; FLUX RATES ; ISLAND-ARC ; SUBDUCTION ; BENEATH ; LAVAS ; HETEROGENEITY ; GEOCHEMISTRY ; SEDIMENT |
WOS研究方向 | Geology |
语种 | 英语 |
出版者 | TAYLOR & FRANCIS INC |
WOS记录号 | WOS:000565799900009 |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.idsse.ac.cn/handle/183446/7896] |
专题 | 深海科学研究部_深海地质与地球化学研究室 |
通讯作者 | Tian, Liyan |
作者单位 | 1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China 2.Curtin Univ, Sch Earth & Planetary Sci, Inst Geosci Res, Perth, WA, Australia 3.SOA, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao, Peoples R China 4.Jilin Univ, Coll Earth Sci, Changchun, Peoples R China 5.State Ocean Adm, Key Lab Submarine Geosci, Second Inst Oceanog, Hangzhou, Peoples R China 6.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China |
推荐引用方式 GB/T 7714 | Wu, Xichang,Tian, Liyan,Wang, Xuan-Ce,et al. Tracing mantle sources in the northern Lau back-arc basin by independent component analysis of basalt isotopic compositions[J]. INTERNATIONAL GEOLOGY REVIEW,2020,62(7-8):938-954. |
APA | Wu, Xichang.,Tian, Liyan.,Wang, Xuan-Ce.,Chu, Fengyou.,Yan, Quanshu.,...&Chen, Ling.(2020).Tracing mantle sources in the northern Lau back-arc basin by independent component analysis of basalt isotopic compositions.INTERNATIONAL GEOLOGY REVIEW,62(7-8),938-954. |
MLA | Wu, Xichang,et al."Tracing mantle sources in the northern Lau back-arc basin by independent component analysis of basalt isotopic compositions".INTERNATIONAL GEOLOGY REVIEW 62.7-8(2020):938-954. |
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