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| 1 | On ultrahigh temperature crustal metamorphism:Phase equilibria,trace element thermometry,bulk composition,heat sources,timescales and tectonic settings显示文摘Ultrahigh temperature(UHT) metamorphism is the most thermally extreme form of regional crustal metamorphism,with temperatures exceeding 900℃.UHT crustal metamorphism is recognised in more than 50 localities globally in the metaniorphic rock record and is accepted as 'normal' in the spectrum of regional crustal processes.UHT metamorphism is typically identified on the basis of diagnostic mineral assemblages such as sapphirine+ quartz,orthopyroxene + sillimanite ± quartz and osumilite in Mg-AIrich rock compositions,now usually coupled with pseudosection-based thermobarometry using internally-consistent thermodynamic data sets and/or Al-in-Orthopyroxene and ternary feldspar thermobarometry.Significant progress in the understanding of regional UHT metamorphism in recent years includes:(1) development of a ferric iron activity-composition thermodynamic model for sapphirine,allowing phase diagram calculations for oxidised rock compositions:(2) quantification of UHT conditions via trace element thermometry,with Zr-in-rutile more commonly recording higher temperatures than Ti-in-zircon.Rutile is likely to be stable at peak UHT conditions whereas zircon may only grow as UHT rocks are cooling.In addition,the extent to which Zr diffuses out of rutile is controlled by chemical communication with zircon;(3) more fully recognising and utilising temperature-dependent thermal properties of the crust,and the possible range of heat sources causing metamorphism in geodynamic modelling studies:(4) recognising that crust partially melted either in a previous event or earlier in a long-duration event has greater capacity than fertile,unmelted crust to achieve UHT conditions due to the heat energy consumed by partial melting reactions:(5) more strongly linking U-Pb geochronological data from zircon and monazite to P-T points or path segments through using Y + REE partitioning between accessory and major phases,as well as phase diagrams incorporating Zr and REE;and(6)improved insight into the settings and factors responsible for UHT metamorphism via geodynamic forward models.These models suggest that regional UHT metamorphism is,principally,geodynamically related to subduction,coupled with elevated crustal radiogenic heat generation rates. | David E.Kelsey Martin Hand | 2015 | Geoscience Frontiers2015，6，3： | 28 |
| 2 | 高温-超高温变质作用成因研究——来自华北克拉通西部孔兹岩带和南非Kaapvaal克拉通西南部Namaqua活动带与Bushveld变质杂岩体的启示显示文摘超高温变质作用是在变质地质学领域,继超高压变质作用研究高峰之后的又一重要前缘课题,对于认识地壳构造-热演化具有重要意义。本文总结了华北克拉通西部孔兹岩带和南非Kaapvaal克拉通西南部Namaqua活动带与Bushveld变质杂岩体的高温-超高温麻粒岩的化学成分、矿物组合、变质演化特征,及其相应的变质事件与构造属性。我国的超高温变质作用带,包括华北克拉通西部的孔兹岩带——从内蒙西段的大青山到东段的集宁-凉城地区的超高温变质岩,皆为Al-Mg质和Al饱和体系的超高温变质岩石,常见假蓝宝石+石英、尖晶石+石英的典型超高温变质组合,以及含假蓝宝石±尖晶石、但缺少石英的非典型超高温变质组合。南非Namaqua活动带与Bushveld变质杂岩体分别发现有独特的Fe-Al饱和的铁尖晶石+石英+大隅石、刚玉+高温石英等超高温矿物组合,罕见的高温硼硅酸盐和硅硼铝镁石等超高温矿物组合;以及Ca-Mg质饱和的钙镁橄榄石+镁硅钙石镁黄长石+镁橄榄石等超高温矿物组合的麻粒岩。研究的核心问题是矿物和岩石在高温-超高温条件下的特殊行为方式,不同构造环境和岩石化学成分下的变质反应及其热动力学过程。由此提出超高温变质作用成因研究中的科学问题:包括不同类型和地质属性的高温-超高温麻粒岩的成因特征;麻粒岩的形成条件演化过程和构造背景;高温-超高温变质过程中部分熔融和重新水化过程中流体的作用以及岩体形变过程中的部分熔融;变质反应以及变质作用P-T-t轨迹、元素地球化学和熔体作用行为;岩石保留的可能的变质事件和年代学记录,定量评价高温-超高温过程中变质演化的时间跨度和演化速率。 | 李旭平 王晗 孔凡梅 | 2019 | 岩石学报2019，35，2： | 9 |
| 3 | Spinel + quartz-bearing ultrahigh-temperature granulites from Xumayao,Inner Mongolia Suture Zone,North China Craton:Petrology,phase equilibria and counterclockwise p-T path显示文摘在在北方中国 Craton 的内部蒙古缝术地区(IMSZ ) 以内的 Khondalite 带是为 Paleoproterozoic 的一个经典例子超离频温度(UHT ) 变态。这里,我们在 IMSZ 的南部的领域以内在 Xumayao 从一个新地区报导新忍受尖晶石的 metapelitic granulites。Petrological 研究并且尖晶石 + 的热力学的建模忍受石英的集合证明这些岩石以 UHT 条件经历了极端变态。尖晶石组织上发生在二背景:1 ) 高 XZn (Zn/(Mg +FeII + Zn )= 0.0710.232 ) 有在岩石矩阵的 perthitic K 长石,矽线石和石英的尖晶石;并且 2 ) 低 XZn (0.0450.070 ) 尖晶石作为在与石英和矽线石联合的石榴石 porphyroblasts 以内的包括。我们当模特儿的阶段 equilibria 在这些岩石的变形进化期间显示二个主要阶段: 1 )从 975 的在等压附近的冷却????畘慭慹?????????????朠慲畮楬整????????????????慲潴????????煥極楬牢慩?????????????胴?? | Huatian Zhang Jianghai Li Shoujie Liu Wenshan Li M. Santosh Honghao Wang | 2012 | Geoscience Frontiers2012，3，5： | 8 |
| 4 | 大青山-乌拉山变质杂岩带大南沟地区含榴尖晶黑云钾长片麻岩成因及其形成的P-T条件显示文摘大南沟贫硅的含榴尖晶黑云钾长片麻岩出露于华北克拉通西北部大青山-乌拉山变质杂岩带(孔兹岩带)中,主要以大小不等的透镜状和互层状产于石榴长英质粒状岩石和石榴堇青夕线黑云二长片麻岩中。本文通过岩相学、变质反应、成因矿物学、矿物化学以及相平衡模拟的综合研究,揭示含榴尖晶黑云钾长片麻岩的成因机制及其形成的P-T条件。研究表明,大南沟含榴尖晶黑云钾长片麻岩内尖晶石的Zn含量极低(XZn=Zn/(Fe2++Mg+Zn)<0.006)。含尖晶石的后成合晶微域反映峰后退变条件下局部的再平衡过程,其中石榴石分解形成的钾长石+尖晶石±斜长石后成合晶是由Grt+Sil+Melt→Kfs+Spl+Pl反应形成的。而细粒尖晶石-刚玉-磁铁矿矿物组合及相应的退变结构是在晚期降温和氧化作用下,通过反应Splss+O2→Spl+Mag+Crn分解形成的。相平衡模拟结果表明含榴尖晶黑云钾长片麻岩峰期矿物组合为Bt+Grt+Spl+Mag+Sil+Kfs+Pl+Liq,稳定的温压条件在830~870℃和8.3~8.6kb,位于夕线石的稳定域。 | 蔡佳 刘福来 刘平华 施建荣 刘建辉 | 2013 | 岩石学报2013，29，7： | 6 |
| 5 | Cenozoic ultrahigh-temperature metamorphism in pelitic granulites from the Mogok metamorphic belt, Myanmar显示文摘Ultrahigh-temperature(UHT)metamorphism is critical for understanding the most extreme thermal evolution of continental crust.However,UHT metamorphism predominantly occurred in the Precambrian and is rarely observed in the modern Earth.Here,we report the discovery of~25 Ma UHT granulites from the Mogok metamorphic belt(MMB)in Myanmar via a combined study of petrology and geochronology.The studied pelitic granulites well preserve a peak mineral assemblage of garnet+sillimanite+plagioclase(antiperthite)+K-feldspar+quartz+Ti-rich biotite+rutile+ilmenite.Pressure(P)-temperature(T)pseudosections and conventional geothermobarometry data only constrain the P-T conditions of the peak stage to<12 kbar and 780–890°C.However,high Zr contents in the matrix rutile(3005–4308 ppm)and high Ti contents(up to 9.2 wt% TiO_(2))in the biotite demonstrate that the Mogok granulites may have experienced UHT metamorphism.The Zr-in-rutile thermometer and X_(Grs) isopleth in the pseudosections yield peak P-T conditions of~12 kbar and>900°C.In situ SIMS and LAICP-MS U-Pb dating and trace element analyses show that both metamorphic zircon cores and rims have flat heavy rare earth element(HREE)patterns with negative Eu anomalies.The metamorphic zircon rims show the lowest HREE contents and yield ^(206)Pb/^(238)U ages of 24.9±0.5 and 25.4±0.6 Ma,respectively,representing the timing of UHT metamorphism.Our results indicate that the central MMB underwent~25 Ma UHT metamorphism,which is possibly induced by continental rifting along the thinned orogenic lithosphere.Our data,as well as reported Cenozoic UHT events,further suggest that UHT metamorphism can be produced in the modern plate tectonic regime by lithospheric extension. | Si CHEN Yi CHEN Yibing LI Bin SU Qinghua ZHANG Me Me AUNG Kyaing SEIN | 2021 | Science China Earth Sciences2021，64，11： | 2 |
| 6 | 缅甸抹谷变质带新生代超高温变质作用显示文摘超高温变质作用是探知大陆地壳极端热演化的重要窗口,广泛分布于前寒武纪,在新生代极少出现.文章通过详细的岩石学和年代学研究,在缅甸抹谷变质带中发现了~25Ma的超高温泥质麻粒岩,峰期矿物组合为石榴子石+夕线石+斜长石(反条纹长石)+钾长石+石英+富Ti黑云母+金红石+钛铁矿.尽管传统矿物温压计和压力(P)-温度(T)视剖面图限定其峰期变质压力<12kbar,变质温度为780~890°C,但基质金红石Zr含量(3005~4308ppm)和高Ti黑云母(TiO_(2)含量最高达9.2wt%)均指示抹谷泥质麻粒岩经历了超高温变质作用.金红石Zr温度计结合视剖面图中石榴子石XGrs等值线限定峰期变质温压条件为>900°C和~12kbar.锆石SIMS和LA-ICP-MS U-Pb定年及微量元素分析显示,变质锆石都具有重稀土(HREE)平坦的配分模式和Eu的负异常特征.两个麻粒岩样品中HREE含量最低的变质锆石分别给出了(24.9±0.5)和(25.4±0.6)Ma的206Pb/238U年龄,代表了超高温变质时代.研究结果表明,抹谷地区在~25Ma经历了超高温变质作用,这可能是板块汇聚边缘的大陆张裂引发岩石圈伸展导致的,进一步论证了在现代板块构造体制下岩石圈伸展是诱发超高温变质作用的关键机制. | 陈思 陈意 李仪兵 苏斌 张庆华 Me Me AUNG Kyaing SEIN | 2021 | 中国科学:地球科学2021，51，11： | 0 |
| 7 | Structural and tectonothermal evolution of the ultrahigh-temperature Bakhuis Granulite Belt,Guiana Shield,Surinam:Palaeoproterozoic to recent显示文摘We constrain the multistage tectonic evolution of the Palaeoproterozoic UHT metamorphic(P=0.9–1.0 GPa,T>1000℃,t=2088–2031 Ma)Bakhuis Granulite Belt(BGB)in Surinam on the Guiana Shield,using large-to small-scale structures,Al-in-hornblende thermobarometry and published fluid inclusion and zircon geochronological data.The BGB forms a narrow,NE–SW striking belt between two formerly connected,~E–W oriented granite-greenstone belts,formed between converging Amazonian and West African continental masses prior to collision and Transamazonian orogeny.Inherited detrital zircon in BGB metasediments conforms agewise to Birimian zircon of West Africa and suggests derivation from the subsequently subducted African passive margin.Ultrahigh-temperature metamorphism may have followed slab break-off and asthenospheric heat advection.Peak metamorphic structures result from layer-parallel shearing and folding,reflecting initial transtensional exhumation of the subducted African margin after slab break-off.A second HT event involves intrusion,at ca.0.49 GPa,of charnockites and metagabbros at 1993–1984 Ma and a layered anorthosite at 1980 Ma,after the BGB had already cooled to<400℃.The event is related to northward subduction under the greenstone belts,along a new active margin to their south.A pronounced syntaxial bend in the new margin points northward towards the BGB and is likely the result of indentation by an anticlinorial flexural bulge of the subducting plate.Tearing of the subducting oceanic plate along this bulge explains why the charnockites are restricted to the BGB.The BGB subsequently experienced doming under an extensional detachment exposed in its southwestern border zone.Exhumation was focused in the BGB as a result of the flexural bulge in the subducting plate and localised heating of the overriding plate by charnockite magmatism.The present,straight NE–SW long-side boundaries of the BGB are superimposed mylonite zones,overprinted by pseudotachylites,previously dated at ca.1200 Ma and 950 Ma,respectively.The 1200 Ma mylonites reflect transpressional popping-up of the BGB,caused by EW-directed intraplate principal compressive stresses from Grenvillian collision preserved under the eastern Andes.Further exhumation of the BGB involved the 950 Ma pseudotachylite decorated faulting,and Phanerozoic faulting along reactivated Meso-and Neoproterozoic lineaments. | Frank F.Beunk Emond W.F.de Roever Keewook Yi Fraukje M.Brouwer | 2021 | Geoscience Frontiers2021，12，2： | 0 |
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