期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
A H_(2)O-in-zircon perspective on the heterogeneous water content of crust-derived magmas in southern Tibet 被引量:1
1
作者 juntong meng Xiaoping XIA +6 位作者 Lin MA Ziqi JIANG Jian XU Zexian CUI Qing YANG Wanfeng ZHANG Le ZHANG 《Science China Earth Sciences》 SCIE EI CSCD 2021年第7期1184-1194,共11页
Geophysical and geochemical evidence revealed that certain amounts of water are stored in the Earth’s interior,and its distribution exhibits temporal and spatial differences.Recent studies indicate that the H_(2)O-in... Geophysical and geochemical evidence revealed that certain amounts of water are stored in the Earth’s interior,and its distribution exhibits temporal and spatial differences.Recent studies indicate that the H_(2)O-in-zircon has a potential to reveal magma water content.Using secondary ion mass spectrometry(SIMS),we analyzed the zircon water content and oxygen isotopes in granitoids(two-mica granite,quartz monzonite,diorite,and granodiorite)from southern Tibet.The results are used to explore the diversity of water content in crust-derived magmas,which is also supported by the LA-ICPMS zircon trace element analysis.There are low zircon water contents for two partial melting products of the ancient crust(peak at 85 and300 ppm,respectively).Meanwhile,there are high H_(2)O-in-zircon peaks(435 and 475 ppm,respectively)for two partial melting products of the juvenile crust.The calculated radiation damage accumulation in these zircon grains is below 3×10^(15)αdecay events mg^(–1),suggesting that the zircon grains are well crystalline.There is no correlation between REE+Y and H+P,indicating that the mechanism of charge balance for water uptaking into zircon,in which the excess of REE+Y to P controls Hcontent,is not applicable to the studied samples.The degree of magma fractionation cannot account for the zircon water content variation,because there is no co-variation between zircon Hf and H_(2)O contents.Similarly,the degree of partial melting was unlikely to be responsible for the H_(2)O-in-zircon distinction.We interpret that the H_(2)O-in-zircon variation reflects the influence of melting mode(dehydration vs.water-fluxed)and water content in the crustal source.In the Late Devonian,dehydration melting of the crustal rocks was facilitated at elevated temperatures,which produced magmas with the lowest water contents.Water-fluxed melting of the ancient crust would produce relatively“drier”magma than water-fluxed melting of the juvenile crust. 展开更多
关键词 H_2O-in-zircon SIMS dehydration melting water-fluxed melting magma water content
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部