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Theoretical models and experimental determination methods for equations of state of silicate melts: A review

Science China Earth Sciences 2019年第5期62卷 751-770页

作者： Juntao HOU Qiong LIU moe key laboratory of orogenic belt and crustal evolution School of Earth and Space Sciences Peking University

Silicate melts are very active in the interior of the Earth and other terrestrial planets, and are important carriers for the transport of material and energy. The determination of the equation of state(EOS) for silicate melts and the acquisition of a precise quantitative relationship between molar volume(or density) and temperature, pressure, and composition is essential for simulating the generation, migration, and eruption processes of magmas and the evolution of the magma ocean stage during the early formation of the Earth and other terrestrial planets, for calculating and modeling the phase equilibria involving silicate melts, and for revealing the variation of the microstructure of silicate melts with pressure. However, it is experimentally challenging to determine the volumetric properties of silicate melts and the accumulated density data at high pressure are still very limited due to a series of problems such as: the high liquidus temperature of silicate rocks; proneness for silicate melts to react with sample capsules to change the melt composition; and proneness for melts to flow and leak during the high pressure and high temperature experiments. In recent years, there is rapid progress in the high pressure and high temperature experimental techniques, in terms of not only the extension of temperature and pressure ranges but also the improvement on the accuracy of measurements, and the emergence of new methods for in-situ measurements. Here, we review the widely-used theoretical models of ambient-pressure and high-pressure EOS for silicate melts, and illustrate some problems that need to be solved urgently:(1) the room pressure EOS for iron-and titanium-bearing silicate melts needs to be improved;(2) the partial molar properties of the H2 O and CO2 components in silicate melts containing volatile components may vary markedly with the melt composition, which need to be addressed in high-pressure EOS;(3) how the formulation and applicable range of EOS corre

关键词： Silicate melts Equations of state Theoretical models Determination methods Melt structure Compression mechanisms

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Zircon SHRIMP geochronology and geochemistry of TTG rocks in Sushui Complex from Zhongtiao Mountains with its geological implications

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Progress in Natural Science:Materials International 2006年第5期16卷 492-500页

作者： TIAN Wei, LIU Shuwen, LIU Chaohui, YU Shengqiang, LI Qiugen and WANG Yueran (key laboratory of orogenic belt and crustal evolution, moe, School of Earth and Space Sciences, Peking University, Beijing 100871, China) key laboratory of orogenic belt and crustal evolution MOE School of Earth and Space Sciences Peking University Beijing 100871 China

The tonalite-trondhjemite-granodiorite (TTG) rocks in Sushui Complex of Zhongtiao Block can be divided into two series according to their zircon U-Pb ages and geochemical characteristics: one is subduction-related (SR) and the other collision-related (CR) . The SR TTG rocks, together with other Late Archean island arc magmatism, were developed as a result of oceanic subduction between the Eastern and Western blocks in Late Archean; while the CR TTG rocks formed in a thickened crustal environment, which was responding to the collision between the Eastern and Western blocks in Paleoproterozoic. All these features support a model that the Zhongtiao Block is a part of the Trans-North China Orogen in the middle of North China Craton.

关键词： Sushui Complex Zhongtiao Block Trans-North China Orogen zircon U-Pb geochronology trace element simulation.

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Geochronology and Geochemistry of the Tinggong Porphyry Copper Ore Deposit, Tibet

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Acta Geologica Sinica(English Edition) 2014年第3期88卷 780-800页

作者： CHEN Rui LIU Yulin GUO Lishuang WANG Zhenghua LIU Hongfei XU Kaifeng ZHANG Jinshu key laboratory of orogenic belt and crustal evolution MOE Peking University key laboratory of crustal Dynamics Institute of Crustal Dynamics CEA Wanbao Mining Limited Tibet Institute of Geological Survey

We have determined the ages of the ore-bearing Tinggong porphyries and the Eocene granites using the LA-ICPMS zircon U-Pb *** from one adamellite porphyry and two diorite porphyries yield ages of 15.54±0.28 Ma,15.02±0.25 Ma and 14.74±0.22 Ma,*** ages of two granites are 50.48±0.71 Ma and 50.16±0.48 *** Rare Earth Elements （LREE） are enriched in the ore-bearing adamellite porphyries,which are high-K caic-alkaline and metaluminous,while Heavy Rare Earth Elements （HREE） and Y are strongly depleted,indicating an adakitic *** Large Ion Lithophile Elements （LILE） of the adamellite porphyries are highly enriched,whereas some High Field Strength Elements （HFSE） are *** diorite porphyry in this study is chemically similar to the adamellite porphyries,except that the Mg# of the diorite porphyry is a little higher,demonstrating more mantle *** samples from different rocks are selected for in situ zircon Hf isotopic *** samples show positive εHf（t） values and young Hf model ages,indicating their derivation from juvenile ***,the adamellite porphyry and diorite porphyry formed in the Miocene exhibit more heterogeneous Hf isotopic ratios,with lower （Σ）Hf （t） values than the granites formed in the Eocene,suggesting the involvement of old Indian continent crust in their *** geochronology and geochemistry of the adamellite porphyries and the diorite porphyries indicate that they formed from the same source region in a post-collisional environment,but contaminated by crust and mantle materials in different *** metallic minerals formed mainly during the older adamellite porphyry stage,but they were recycled and reactivated by the diorite porphyry intrusion.

关键词： Tinggong Adamellite porphyry Diorite porphyry Zircon U-Pb-Hf isotope Geochemistry

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Very Low-Grade Metamorphism of Clastic Rocks from the Meso-Neoproterozoic and the Paleozoic along the Profile Yueyang-Linxiang in Northeastern Hunan Province and Its Geological Implications

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Acta Geologica Sinica(English Edition) 2016年第5期90卷 1743-1753页

作者： WANG Hejing YUAN Lei WANG Ling ZHOU Zhao AN Jiali School of Earth and Space Sciences Peking University key laboratory of orogenic belt and crustal evolution Ministry of Education

This study uses illite crystallinity,chlorite crystallinity,illite polytypes,the b0 cell-dimension of K-white mica,clay mineral assemblages and mineral geothermo-geobarometers to investigate the overprint of diagenesis and metamorphism on the Meso-Neoproterozoic and the Lower Paleozoic along the profile Yueyang-Linxiang in northeastern Hunan Province,*** crystallinity Kbler index（KI） of the 〈2μm fractions ranges from 0.225 to 0.485°Δ2θ while chlorite crystallinity Arkai index（AI） ranges from 0.244 to 1.500°Δ2θ.This indicates that the Meso-Neoproterozoic and the Lower Paleozoic along the profile Yueyang-Linxiang were overprinted with diagenesis and anchi- to *** metamorphic temperature is estimated with the IV site chlorite geothermometer roughly at 360℃.The b0 cell dimension values of illites（K-mica） range from 0.9002 to 0.9054 nm and,on average,at 0.9030 nm for the *** on cumulative frequency curves of illite（K-mica） b0 cell dimension,the peak metamorphic pressure of the MesoNeoproterozoic along the profile Yueyang-Linxiang is derived of an intermediate pressure *** illites occur in the 2M1 polytype and some of them in a mixture of 2M1＋1M types especially those in the *** result partly agrees with the conclusion of the lower greenschist and greenschist facies of the Lengjiaxi and Banxi ***,it is not agreed with the sedimentary cover from the Sinian to the Lower Paleozoic or from the Banxi Group to the Lower *** thickening due to ＂collision＂ between the Yangtze and Cathaysia blocks led to an increase in the thickness of the Meso-Neoproterozoic to ca.14 km and resulted in a temperature increase in those rocks due to *** very low grade to low grade metamorphism overprinting the Meso-Neoproterozoic implies that the so called ＂Chiangnania or Jiangnan orogen＂ was no relative with the ＂Grenvillian orogeney;instead,it might be a continuous amalgamation product between the Yang

关键词： diagenesis very low-grade metamorphism illite crystallinity Meso-Neoproterozoic lowerpalaeozoic

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The geological characteristics of oceanic-type UHP metamorphic belts and their tectonic implications: Case studies from Southwest Tianshan and North Qaidam in NW China

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Chinese Science Bulletin 2008年第20期53卷 3120-3130页

作者： ZHANG LiFei LU Zeng ZHANG GuiBin SONG ShuGuang moe key laboratory of orogenic belt and crustal evolution School of Earth and Space Sciences Peking University Beijing 100871 China

The geological characteristics of ultrahigh-pressure (UHP) metamorphic belts formed by deep subduction of oceanic crust are summarized in this paper. Oceanic-type UHP metamorphic belt is characterized by its protolithic assemblage of typical oceanic crust, the peak metamorphic temperature evolution, respectively, with low geothermal gradient of cold subduction. The further study of oceanic-type UHP metamorphic belt is very significant for constructing metamorphic reaction series of cold subduction zone, for understanding how aqueous fluids were transported into deep mantle and for classifying the types of UHP metamorphism in cold subduction zone. The uplift and exhumation mechanism of oceanic UHP metamorphic rocks is one of the most challenging problems in the study of UHP metamorphism, which is very important for understanding the geodynamic mechanism of solid Earth. As a traveler subducted into the mantle depth and then uplifted to the surface, oceanic-type UHP metamorphic belts witness the bulk process from the subduction to exhumation and is an ideal target to study the geochemical behavior and cycling of elements in subduction zones. The tectonic evolution of one convergent orogenic belt can be usually divided into two stages of oceanic subduction and followed continental subduction and collision, and the two best-established examples of orogenic belts are Alps and Himalaya. Therefore, the study of oceanic-type UHP metamorphic belt is the frontier of the current plate tectonic theory. As two case studies, the current status and existing problems of oceanic-type UHP metamorphic belts in Southwest Tianshan and North Qaidam, NW China, are reviewed in this paper.

关键词：地质运动超高压变质带潜没地带天山中国

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Geochronology and Geochemistry of the Late Cretaceous to Paleocene Intrusions in East Gangdese,Lhasa,Tibet and Their Tectonic Significances

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 441-466页

作者： Lü Xin WANG Zhenghua LIU Yulin LIU Hongfei XU Kaifeng ZHANG Jinshu The key laboratory of orogenic belt and crustal evolution MOEPeking University Wanbao Mining Limited Tibet Institute of Geological Survey

In this study, we determined the granite ages in the middle to east Gangdese batholith. Zircon ages from these granites are 57.6-68.7 Ma, indicating that intrusions were formed in the Late Cretaceous to early Paleocene. The large-ion lithophile elements are highly enriched, whereas some high-field-strength elements are depleted. The Sr-Nd-Pb isotopic characteristics are similar to those of the Dianzhong volcanics in the Linzhou Basin, indicating the same origin and tectonic environment. The samples show positive εHf（t） values that are slightly lower than the values for the Linzizong volcanics, the Quxu intrusion, and other intrusions in middle Gangdese. We conclude that our samples, the Linzizong volcanics, and most main-collisional intrusions are derived from the same source with different ratios of crust and mantle input. On the basis of geological, geochemical, geochronological, and isotopic information, we conclude that the Late Cretaceous to Paleogene evolution of Gangdese can be divided into three stages. First, the collision began at 70-60 Ma, the same time as rollback of the Tethys Ocean slab. Second, during 60-50 Ma, slab breakoff triggered upwelling of the asthenosphere. Third, after 50 Ma, the Tethys Ocean slab＇s effect disappeared and the interaction between Indian and Asian crusts began influencing magmatism in Gangdese.

关键词： Gangdese granite late Cretaceous-Paleocene zircon U-Pb age geochemistry Sr-Nd-Pbisotope Hf isotope

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Snowball Earth at low solar luminosity prevented by the oceanatmosphere coupling

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Acta Geochimica 2019年第6期38卷 775-784页

作者： Ruimin Wang Bing Shen key laboratory of orogenic belts and crustal evolution MOE School of Earth and Space Science Peking University

The standard solar model proposes that the solar luminosity was 30%lower than the present level at 4.5 billion years ago(Ga).At low solar radiation,the climate model predicts that the Earth should have been completely covered by ice in the first 2 billion years,*** the snowball Earth climate mode,when the atmospheric CO2 content was at the present ***,snowball Earth condition is inconsistent with various sedimentological,paleontological,and geochemical *** controversy is collectively known as the Taint Young Sun,(FYS)*** various models have been proposed,the FYS paradox has not yet been *** this study,we develop a model by considering the ocean-atmosphere coupling to show that high atmospheric CO2 level could be sustained at low seawater *** modeling result indicates that 0.1 bar atmospheric CO2 level that was required to prevent snowball Earth in early Archean could be sustained at seawater pH of *** the absence of siderite in Archean paleosols has been used to argue against high atmospheric CO2 level,we suggest that siderite precipitation in paleosols was not controlled by the atmospheric CO2 level ***,siderite could precipitate in anoxic conditions with various amount of CO2 in the atmosphere,suggesting siderite cannot be used to reconstruct the atmospheric CO2 ***,the new model suggests that the snowball Earth condition could be prevented by the coupling of atmosphere and ocean systems,and thus the emergence of the ocean in the very beginning of Earth evolution might be the key to the subsequence evolution of habitability.

关键词： Faint Young Sun paradox Carbon dioxide Earth system Siderite

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Electron microprobe analysis of Hf and Ti in ultrahigh temperature zircon:Optimized approaches and perspectives

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Science China Earth Sciences 2023年第5期66卷 985-996页

作者： Xiaoli LI Bin WANG Chunjing WEI key laboratory of orogenic belts and crustal evolution moe School of Earth and Space SciencesPeking UniversityBeijing100871China

Zircon as a multi-objective typomorphic mineral commonly contains diverse trace elements with specific petrogenetic *** Hf abundance in zircon is sensitively indicative of melt fractionation during zircon growth on one hand,and on another,the Ti content is a robust temperature sensor of zircon crystallization and has been effectively u tilized in thermometric estimation.A Hf-Ti negative correlation was previously reported in igneous zircons,and thus a potential Hf thermometry was then *** this work,we performed reliable electron microprobe(EMP)measurements of Hf and Ti in ultrahigh temperature(UHT)zircons from the North China Craton,in optimizing point,line and grid *** EMP contents of Hf and Ti both show a wide range of fluctuation owing to the smaller probe spot,and some of them are higher than the LAICPMS *** Hf-Ti correlation in UHT zircons displays dual and thus complicated patterns in contrast with the previous consideration,which implicates some other factors controlling the geochemical behaviors of Hf and Ti in ***,the estimated Ti temperatures based on the EMP analyses are obviously higher than the LA-ICPMS outcomes,but are well consistent with the actual peak condition of the parent *** explains the common underestimation of Ti temperatures in hightemperature metamorphic rocks,by using LA-ICPMS analyses.

关键词： Ultrahigh-temperature Zircon Hf content Ti content Electron microprobe

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The crystal chemistry and the compressibility of silicate-carbonate minerals:Spurrite,galuskinite and tilleyite

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Geoscience Frontiers 2015年第5期6卷 771-777页

作者： Jing Gao Xiang Wu Shan Qin key laboratory of orogenic belts and crustal evolution.moe School of Earth and Space SciencesPeking University

Spurrite Ca5（SiO4）2（CO3）,galuskinite Ca7（SiO4）3（CO3） and tilleyite Ca5（Si2O7）（CO3）2are three representative minerals formed in high-temperature skarns in the silicate-carbonate *** crystal chemistry and compressibility have been investigated using first-principles theoretical *** minerals are structurally described as the combination of interwoven layers constituted by Ca polyhedra and Si polyhedra,with the[CO3]triangles being 'separators' to depolymerize the Si-Ca *** the effect of pressure,the Si polyhedra and the[CO3]groups present rigid behaviors whereas the Ca-0 bonds undergo considerable *** pressure-induced abnormities in the lattice parameter variations have been identified,revealing the existence of subtle changes in the compression *** equations of state parameters are obtained:K0= 71.1（1） GPa,V0= 1003.31（4） A3and K0′ = 5.4（1）for spurrite;K0= 75.0（1） GPa.V0= 1360.30（7） A3,K0’ = 5.4（1） for galuskinite,and K0= 69.7（3） GPa,V0= 1168.90（2） A3and K0’ = 4.0（1） for *** compounds have similar K0values to calcite CaCO3but are much more compressible than larnite β-*** for these minerals,the bulk modulus exhibits a negative correlation with the[CO3]*** structural and compressional properties of silicate-carbonate minerals compared with silicates and carbonates are expected to be a guide for further investigations on Si polyhedra and[CO3]coexistent phases.

关键词： Silicate-carbonate minerals Crystal chemistry Comp

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The exhumation of high-and ultrahigh-pressure metamorphic terranes in subduction zone:Questions and discussions

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Science China Earth Sciences 2020年第12期63卷 1884-1903页

作者： Lifei Zhang Yang Wang moe key laboratory of orogenic belts and crustal evolution School of Earth and Space SciencePeking UniversityBeijing100871China

In terms of petrology,thermomechanical simulation is an important frontier to study the geodynamic process of the exhumation and uplift of high pressure(HP)to ultrahigh pressure(UHP)metamorphic rocks in subduction zones and collision orogenic *** on the recent petrological studies and numerical modellings for the exhumation of HP to UHP metamorphic terranes,the exhumation mechanisms of HP to UHP metamorphic terranes can be roughly summarized into ten types:channel flow,diapiric exhumation,a coexistence mechanism of channel flow and diapiric exhumation,slab breakoff,multi-stage exhumation,divergent plate motion(including slab rollback and the upper-plate divergent motion away from the subducted plate),overthrust exhumation,overpressure mechanism,wedge-like extrusion and microplate *** exhumation of high-density UHP oceanic eclogites is a relative controversial *** of our recent researches on quantitatively determining the exhumation mechanism of UHP oceanic eclogites using thermomechanical and phase equilibrium modelling was introduced in details in this *** obtained the 3-D density evolutions of three-type subducted oceanic materials(MORB,serpentine and oceanic sediments)in P-T space by the methods of phase equilibrium and density *** to the density difference between the metabasic and their surrounding rocks,the exhumed eclogites could be divided into two *** first category,the self-exhumation eclogites(ρ_(MORB)ρmantle),which can only be carried back to the surface with the assistance of low-density metasediments and serpentinite due to their negative buoyancy;the coesite-bearing UHP eclogites of Zermatt-Saas in the Western Alps is a typical ***,we further explored the ultimate self-exhumation depth,exhumation mechanism

关键词： HP-UHP metamorphism Exhumation mechanisms Eclogite Density Subduction zone

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