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The Formation of Yanshanian Granitic Magma in Dabie Mountains:dehydration or Aquifer melting-with Tiantangzhai and Jiuzihe Granites as Examples

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Continental Dynamics 2001年第2期6卷 39-47页

作者： WANG Qiang, ZHAO Zhenhua, QIU Jiaxiang, WANG Renjing, XU Jifeng Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou P.R.C 510640 China University of Geosciences, Wuhan, P.R.C 430074 Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou P.R.C 510640 China University of Geosciences Wuhan P.R.C 430074

There are large-areas of late Yanshanian granites in the Dabie Orogen, but the formation mode of the relevant granitic magma is still under discussion. Taking the typical Yanshanian granites in the North Dabie Block - The TG and JG as examples, the Writers endeavor to discuss contain aspects of the formation mode of the granitic magma by studying the characteristics of the chemical compositions of biotite and amphibole of the granites and petrological features of enclaves in the intrusions, in the light of recent results of experimental petrology on dehydration melting and aquifer melting. It is suggested that: (1) Some biotites in the Tiantangzhai and the JGs and their enclaves were residual minerals; (2) Some of the amphiboles could be new-born minerals, and others, residual ones. (3) the banded bodies in granites were residuals of anatexis. (4) The TG and JG were formed by aquifer melting, and the South Dabie Block could be the important source region of water.

关键词： petrogenesis of granite dehydration melting aquifer melting enclaves characteristics aquifer fluid the Dabie Orogen

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A H_(2)O-in-zircon perspective on the heterogeneous water content of crust-derived magmas in southern Tibet

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Science China Earth Sciences 2021年第7期64卷 1184-1194页

作者： Juntong MENG Xiaoping XIA Lin MA Ziqi JIANG Jian XU Zexian CUI Qing YANG Wanfeng ZHANG Le ZHANG State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China College of Earth and Planetary Science University of Chinese Academy of SciencesBeijing 100049China School of Earth Science Guilin University of TechnologyGuilin 541004China

Geophysical and geochemical evidence revealed that certain amounts of water are stored in the Earth’s interior,and its distribution exhibits temporal and spatial *** studies indicate that the H_(2)O-in-zircon has a potential to reveal magma water *** 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 *** 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 *** 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 *** calculated radiation damage accumulation in these zircon grains is below 3×10^(15)αdecay events mg^(–1),suggesting that the zircon grains are well *** 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 *** 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 ***,the degree of partial melting was unlikely to be responsible for the H_(2)O-in-zircon *** interpret that the H_(2)O-in-zircon variation reflects the influence of melting mode(dehydration ***-fluxed)and water content in the crustal *** the Late Devonian,dehydration melting of the crustal rocks was facilitated at elevated temperatures,which produced magmas with the lowest water ***-fluxed melting of the ancient crust would produce relatively“drier”magma than water-fluxed melting of the juvenile crust.

关键词： H_2O-in-zircon SIMS dehydration melting water-fluxed melting magma water content

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Exploring the metamorphic consequences of secular change in the siliciclastic compositions of continental margins

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Geoscience Frontiers 2018年第4期9卷 967-975页

作者： Gautier Nicoli Brendan Dyck Department of Earth Sciences University of Cambridge Department of Earth Sciences Simon Fraser University

Shale and greywacke compositions from the Archean to Phanerozoic record a secular change in the siliciclastic material that comprises much of Earth＇s continental margins, past and present. This study explores the metamorphic consequence of these compositional changes, by comparing phase equilibrium models constructed for average Archean, Proterozoic, and Phanerozoic shale and greywacke compositions equilibrated along two Barrovian-type geotherms： 1330℃/GPa（A） and 800 ℃/GPa（B）. Our models show that Archean siliciclastic rocks can retain up to 4 vol.% water at middle to lower crustal conditions, nearly twice that of Proterozoic and Phanerozoic compositions. The increased ferromagnesium content of Archean siliciclastic rocks stabilizes chlorite to higher temperatures and results in a biotite-rich assemblage at solidus temperatures. Accordingly, water-absent biotite dehydration melting is predicted to play a greater role in the generation of melt in the metamorphism of Archean aged units,and water-absent muscovite dehydration melting is of increasing importance through the Proterozoic and Phanerozoic. This secular variation in predicted mineral assemblages demonstrates the care with which metamorphic facies diagrams should be applied to Archean compositions. Moreover, secular changes in the composition of shale and greywacke is reflected in the evolution of anatectic melt towards an increasingly less viscous, Ca-rich, and Mg-poor monzogranite.

关键词： Secular change Shale Greywacke dehydration melting Thermodynamic modelling Perple_X

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