Constraints of boron and oxygen stable isotopes on dehydration fluids, sediment-derived melts, and crustal assimilation of the Toba volcanic system (Indonesia)
文献类型：期刊论文
| 作者 | Liu, Ping-Ping4; Wang, Dian-Bing3; Zhou, Mei-Fu3; Li, Xian-Hua2; Li, Qiu-Li2; Gaetani, Glenn A.5; Monteleone, Brian5; Kamenetsky, Vadim1 |
| 刊名 | GEOLOGY
 |
| 出版日期 | 2024-03-01 |
| 卷号 | 52期号:3页码:161-165 |
| ISSN号 | 0091-7613 |
| DOI | 10.1130/G51690.1 |
| 通讯作者 | Liu, Ping-Ping(ppliu@pku.edu.cn) |
| 英文摘要 | Arc magmas are produced from the mantle wedge, with possible addition of fluids and melts derived from serpentinites and sediments in the subducting slab. Identification of various sources and their relevant contributions to such magmas is challenging; in particular, at continental arcs where crustal assimilation may overprint initial geochemical signatures. This study presents oxygen isotopic compositions of zoned olivine grains from post-caldera basalts and boron contents and isotopes of these basalts and glassy melt inclusions hosted in quartz and clinopyroxene of silicic tuffs in the Toba volcanic system, Indonesia. High-magnesian (>= 87 mol% Fo [forsterite]) cores of olivine in the basalts have delta O-18 values ranging from 5.12 parts per thousand to 6.14 parts per thousand, indicating that the mantle source underneath Toba is variably enriched in O-18. Olivine with <87 mol% Fo has highly variable (4.8-7.2 parts per thousand), but overall increased, delta O-18 values, interpreted to reflect assimilation of high delta O-18 crustal materials during fractional crystallization. Mass balance calculations constrain the overall volume of crustal assimilation for the basalts as <= 13%. The processes responsible for the O-18-enriched basaltic melts are further constrained by boron data that indicate the addition of <0.1 wt% fluids to the mantle, >40% of the fluids being derived from serpentinites and others from altered oceanic crust and sediments. This amount of fluids can increase delta O-18 of the magma by only similar to 0.02 parts per thousand. Approximately 6-9% sediment-derived melt hybridization in the mantle wedge is further needed to yield basaltic melts with delta O-18 values in equilibrium with those of the high-Fo olivine cores. The cogenetic silicic tuffs, on the other hand, seem to record a higher proportion of fluid addition dominated by sediment-derived fluids to the mantle source, in addition to crustal assimilation. Our reconnaissance study therefore demonstrates the application of combined B and O isotopes to differentiate between melts and fluids derived from serpentinites and sediments in the subducted slab-an application that can be applied to arc magmas worldwide. |
| WOS关键词 | MANTLE SOURCE ; INPUT ; SLAB |
| 资助项目 | National Science Foundation of China[41872058] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001233691500001 |
| 出版者 | GEOLOGICAL SOC AMER, INC |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/199600]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Liu, Ping-Ping |
| 作者单位 | 1.Inst Oceanol, Chinese Acad Sci, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 2.Inst Geol & Geophys, Chinese Acad Sci, Beijing 100029, Peoples R China 3.Inst Geochem, Chinese Acad Sci, Guiyang 550081, Peoples R China 4.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 5.Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA |
| 推荐引用方式 GB/T 7714 | Liu, Ping-Ping,Wang, Dian-Bing,Zhou, Mei-Fu,et al. Constraints of boron and oxygen stable isotopes on dehydration fluids, sediment-derived melts, and crustal assimilation of the Toba volcanic system (Indonesia)[J]. GEOLOGY,2024,52(3):161-165. |
| APA | Liu, Ping-Ping.,Wang, Dian-Bing.,Zhou, Mei-Fu.,Li, Xian-Hua.,Li, Qiu-Li.,...&Kamenetsky, Vadim.(2024).Constraints of boron and oxygen stable isotopes on dehydration fluids, sediment-derived melts, and crustal assimilation of the Toba volcanic system (Indonesia).GEOLOGY,52(3),161-165. |
| MLA | Liu, Ping-Ping,et al."Constraints of boron and oxygen stable isotopes on dehydration fluids, sediment-derived melts, and crustal assimilation of the Toba volcanic system (Indonesia)".GEOLOGY 52.3(2024):161-165. |
入库方式： OAI收割
来源：海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。