[1]丁 一,刘吉强,李正刚.2020.橄榄石及其熔体包裹体地球化学约束冲绳海槽岩浆水含量.大地构造与成矿学,44(6):1208-1207.doi:10.16539/j.ddgzyckx.2020.06.012
 DING Yi,LIU Jiqiang,LI Zhenggang.2020.Geochemical Constraints on the H2O Contents of Magmas from the Okinawa Trough: A Study of Olivine and Melt Inclusions.Geotectonica et Metallogenia,44(6):1208-1207.doi:10.16539/j.ddgzyckx.2020.06.012


《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]



Geochemical Constraints on the H2O Contents of Magmas from the Okinawa Trough: A Study of Olivine and Melt Inclusions
丁 一1、2 刘吉强1* 李正刚1 李小虎1 朱志敏1 宗 统1、3 朱继浩1
1.自然资源部海底科学重点实验室, 自然资源部第二海洋研究所, 浙江 杭州 310012; 2.浙江大学 地球 科学学院, 浙江 杭州 310027; 3.山东科技大学 地球科学与工程学院, 山东 青岛 266590
DING Yi1、2 LIU Jiqiang1* LI Zhenggang1 LI Xiaohu1 ZHU Zhimin1 ZONG Tong1、3 and ZHU Jihao1
1. Key Laboratory of Submarine Geosciences & Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, Zhejiang, China; 2. School of Earth Sciences, Zhejiang University, Hangzhou 310027, Zhejiang, China; 3. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
H2O含量 橄榄石及其熔体包裹体 岩浆演化 岩浆源区 冲绳海槽
H2O content olivine and its melt inclusions magma evolution mantle source Okinawa Trough
俯冲带是挥发分循环的重要场所, H2O在弧后盆地岩浆的产生和演化中起着至关重要的作用。目前为止, 关于冲绳海槽(OT)(一个新生的陆内弧后盆地)岩浆中H2O含量知之甚少。因此, 本文通过岩浆演化地球化学模拟结合矿物地球化学研究了H2O的含量及H2O在冲绳海槽南部(SOT)和中部(MOT)岩浆成因和演化中的作用。SOT和MOT中的岩浆演化主要受控于橄榄石、单斜辉石和斜长石的分离结晶。SOT岩浆中斜长石相对于MOT出现较晚, 暗示SOT岩浆初始H2O含量更高, 斜长石的结晶抑制作用更为明显。岩浆初始H2O含量较高使Ca在橄榄石和熔体中的分配系数降低形成低Ca的橄榄石, 而并非结晶于辉石岩源区熔融而形成的低Ca熔体。基于Ca在橄榄石及其熔体包裹体的分配系数, 本次研究发现MOT的原始岩浆中H2O含量高达~2%, 且SOT水含量更高。岩浆熔体的H2O含量由于结晶分异作用由2%增加至5%, 后岩浆去气作用造成H2O含量逐渐减少从而导致岩浆中斜长石剧烈结晶。SOT和MOT岩浆地球化学特征及H2O含量的差异主要受控于两个区域Wadati-Benioff带(WBZ)的深度(~100 km vs. ~200 km)。
Back-arc basins are important sites for the flux of volatiles from a subducting slab, and H2O plays a vital role in the generation and evolution of magmas in such basins. Little is known about the H2O contents of magmas in the Okinawa Trough (OT), a nascent intra-continental back-arc basin, so we investigated the role of H2O in magma genesis in the southern and middle parts of the Okinawa Trough (SOT and MOT, respectively) by geochemical modelling of the evolved and primitive magmas. Magma evolution in both the SOT and MOT was dominated by fractional crystallization of clinopyroxene, olivine and plagioclase. The relatively late appearance of plagioclase in the SOT implies the suppression of plagioclase crystallization due to the higher initial H2O content of the SOT magma. The extremely low Ca contents of the olivine indicate high initial H2O contents of the primitive magma rather than an olivine-free source. Using a geohygrometer based on the Ca contents of olivine and melt inclusions within, we found that the H2O contents of the primitive magmas from the MOT were as high as ~2% and more enriched in that from the SOT. The H2O contents of the evolved melts increased to 2% - 5% during magma differentiation. Subsequent magma degassing, reflected by gradual decrease of H2O, resulted in intensive crystallization of plagioclase in magmas with MgO<7%. The distinctive H2O contents of the SOT and MOT magmas can be attributed mainly to the different depth of the Wadati-Benioff Zone (WBZ) beneath the two regions (~100 km vs. ~200 km), which imposed a first-order control on magma-genesis in the OT.


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收稿日期: 2019-05-22; 改回日期: 2019-07-19
项目资助: 浙江省自然科学基金重点项目(LZ16D060001)、中国大洋矿产资源开发协会十三五项目(DY135-E2-2-01)、国家自然科学基金项目(41506073)和自然资源部第二海洋研究所基本科研业务费专项(JG1405)联合资助。
第一作者简介: 丁一(1995-), 男, 博士研究生, 构造地质学专业。Email: dingyi@sio.org.cn
通信作者: 刘吉强(1981-), 男, 副研究员, 主要从事海底矿物岩石学研究。Email: liujq@sio.org.cn
更新日期/Last Update: 2020-12-20