Arc building and maturation of the Lombok Island, East Sunda Arc
文献类型：期刊论文
| 作者 | Tang, Guo-Rong1,2; Dan, Wei1 ; Maulana, Adi3; Wang, Jian1; Zhang, Xiu-Zheng1; Zhang, Yun-Ying4; Ma, Xin1,2; Wang, Qiang1,2; Liu, Xi -Jun5; Tang, Gong-Jian1
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| 刊名 | CHEMICAL GEOLOGY
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| 出版日期 | 2024-09-20 |
| 卷号 | 663页码:15 |
| 关键词 | Basalt Intra-oceanic arc Sr-Nd-Pb-Hf isotopes Arc maturation Volcanic rock Lombok Island Sunda Arc |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2024.122265 |
| 英文摘要 | Intra-oceanic subduction zones are major sites of crust-mantle material exchange and crustal growth; however, the processes responsible for the magmatic evolution and transformation of nascent arcs into mature oceanic arcs with thicker crust are debated. We present mineral chemistry, zircon U-Pb age and Hf isotopic data, and wholerock chemical and Sr-Nd-Hf-Pb isotopic data for Cenozoic volcanic rocks on Lombok in the East Sunda Arc, Indonesia, to investigate their petrogenesis and arc maturation. SIMS zircon U-Pb analyses of lavas from southern Lombok yield an early Oligocene age of similar to 30 Ma. The lavas can be divided into three groups based on their ages and geochemical characteristics: group I (late Eocene) and II (similar to 30 Ma) lavas from southern Lombok, and group III lavas (similar to 3-0 Ma) from northern Lombok. The lavas are characterized by a progressive enrichment in K2O and incompatible element contents, and Nd-Hf isotopic compositions with time. Group I lavas are tholeiitic basalts with low K2O contents (0.15-0.17 wt%) and Indian-MORB like rare earth element (REE) patterns and Nd-Hf isotopic compositions (epsilon(Nd) = +7.4; epsilon(Hf) = +14.5), enrichment in large-ion lithophile elements (e.g., Rb, U, and K), and typical forearc basalt (FAB) geochemical characteristics. Group II lavas are low-K basaltic andesites to dacites that yield flat chondrite-normalized REE patterns [(La/Sm)(N) = 0.9-1.4], uniform initial Sr-87/Sr-86 ratios (0.7038-0.7042), and positive epsilon(Nd)(t) ( +5.9 to +6.8) and epsilon(Hf)(t) (+13.9 to +14.4) values. Group III lavas are typically medium- to high-K calc-alkaline basalt to andesite and are enriched in light REEs [(La/Sm)(N) = 1.6-3.3] with uniform initial Sr-87/Sr-86 ratios (0.7038-0.7042) and slightly low epsilon(Nd)(t) ( +3.9 to +5.4) and epsilon(Hf)(t) (+10.5 to +12.5) values. Progressive enrichment in incompatible element contents and Nd-Hf isotopic compositions over time, from FAB to high-K calc-alkaline lavas, reflect the maturation of the East Sunda Arc. Sr-Nd-Pb-Hf isotopic mixing models, along with trace element ratios (e.g., Ba/Th, La/Yb, Th/Yb), suggest that increasing amounts of sediments were incorporated into the mantle sources of the magmas from group I (similar to 0%) to group II (<0.5%) and group III (0.5%-1.0%) lavas. Partial melting models show that the formation of group I and II lavas can be reproduced by high-degree (similar to 10%) partial melting of spinel peridotite, whereas the group III lavas were formed by low-degree (similar to 5%) partial melting of spinel peridotite. We propose that the evolution of Lombok arc magmas was controlled mainly by the fluxes of subducted slab material, along with decreasing degrees of partial melting as a result of crustal thickening over time. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001272704800001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/72357]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Tang, Gong-Jian |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.Hasanuddin Univ, Dept Geol, Jl Perintis Kemerdekaan KM 10, Makassar 90245, Indonesia 4.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 5.Guilin Univ Technol, Coll Earth Sci, Guangxi Key Lab Explorat Hidden Met Ore Deposits, Guilin 541006, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, Guo-Rong,Dan, Wei,Maulana, Adi,et al. Arc building and maturation of the Lombok Island, East Sunda Arc[J]. CHEMICAL GEOLOGY,2024,663:15. |
| APA | Tang, Guo-Rong.,Dan, Wei.,Maulana, Adi.,Wang, Jian.,Zhang, Xiu-Zheng.,...&Tang, Gong-Jian.(2024).Arc building and maturation of the Lombok Island, East Sunda Arc.CHEMICAL GEOLOGY,663,15. |
| MLA | Tang, Guo-Rong,et al."Arc building and maturation of the Lombok Island, East Sunda Arc".CHEMICAL GEOLOGY 663(2024):15. |
入库方式： OAI收割
来源：广州地球化学研究所
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