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| 1 | Detrital zircon geochronology of the Lutzow-Holm Complex,East Antarctica:Implications for Antarctica-Sri Lanka correlation显示文摘The Lützow-Holm Complex(LHC) of East Antarctica has been regarded as a collage of Neoarchean(ca.2.5 Ga), Paleoproterozoic(ca. 1.8 Ga), and Neoproterozoic(ca. 1.0 Ga) magmatic arcs which were amalgamated through the latest Neoproterozoic collisional events during the assembly of Gondwana supercontinent. Here, we report new geochronological data on detrital zircons in metasediments associated with the magmatic rocks from the LHC, and compare the age spectra with those in the adjacent terranes for evaluating the tectonic correlation of East Antarctica and Sri Lanka. Cores of detrital zircon grains with high Th/U ratio in eight metasediment samples can be subdivided into two dominant groups:(1) late Meso-to Neoproterozoic(1.1-0.63 Ga) zircons from the northeastern part of the LHC in Prince Olav Coast and northern Soya Coast areas, and(2) dominantly Neoarchean to Paleoproterozoic(2.8-2.4 Ga) zircons from the southwestern part of the LHC in southern Lutzow-Holm Bay area. The ca.1.0 Ga and ca. 2.5 Ga magmatic suites in the LHC could be proximal provenances of the detrital zircons in the northeastern and southwestern LHC, respectively. Subordinate middle to late Mesoproterozoic(1.3-1.2 Ga) detrital zircons obtained from Akarui Point and Langhovde could have been derived from adjacent Gondwana fragments(e.g., Rayner Complex, Eastern Ghats Belt). Meso-to Neoproterozoic domains such as Vijayan and Wanni Complexes of Sri Lanka, the southern Madurai Block of southern India, and the central-western Madagascar could be alternative distal sources of the late Meso-to Neoproterozoic zircons. Paleo-to Mesoarchean domains in India, Africa, and Antarctica might also be distal sources for the minor ~2.8 Ga detrital zircons from Skallevikshalsen. The detrital zircons from the Highland Complex of Sri Lanka show similar Neoarchean to Paleoproterozoic(ca. 2.5 Ga) and Neoproterozoic(ca. 1.0 Ga) ages, which are comparable with those of the LHC, suggesting that the two complexes might have formed under similar tectonic regimes. We consider that the Highland Complex and metasedimentary unit of the LHC formed a unified latest Neoproterozoic suture zone with a large block of northern LH-Vijayan Complex caught up as remnant of the ca. 1.0 Ga magmatic arc. | Yusuke Takamura Toshiaki Tsunogae M.Santosh Yukiyasu Tsutsumi | 2018 | Geoscience Frontiers2018，9，2： | 6 |
| 2 | Petrology and SHRIMP zircon geochronology of granulites from Vesleknausen, Lützow-Holm Complex, East Antarctica: Neoarchean magmatism and Neoproterozoic high-grade metamorphism显示文摘We report new petrological data and geochronological measurements of granulites from Vesleknausen in the highest-grade section of the Lützow-Holm Complex, part of the Gondwana-assembling collisional orogen in East Antarctica. The locality is dominated by felsic to intermediate orthogneiss(charnockite and minor biotite gneiss), mafic orthogneiss, and hornblende-pyroxene granulite, with deformed and undeformed dykes of metagranite and felsic pegmatite. Pseudosection analysis of charnockite in the system NCKFMASHTO, supported by geothermometry of mafic orthogneiss, was used to infer peak metamorphic temperatures of 750-850 ℃, approximately 150 ℃ lower than those estimated for metasedimentary gneisses from Rundvagshetta, 6 km to the northeast. SHRIMP U-Pb analysis of zircons from feldspar-pyroxene gneiss, which corresponds to a partially molten patch around mafic orthogneiss,yielded a Concordia upper intercept ages of 2507.9 7.4 Ma, corresponding to the time of formation of the magmatic protolith to the orthogneiss. Partial melting during peak metamorphism probably took place between 591 and 548 Ma, as recorded in rims overgrew around magmatic zircon. Our results suggest that Rundvagshetta-Vesleknausen-Strandnibba region in southwestern Lützow-Holm Bay, where orthogneisses are dominant, consists of a single crustal block, possibly formed by ca. 2.5 Ga arc magmatism. The Neoarchean magmatic terrane was tectonically mingled with other fragments(such as metasedimentary units in northern Lützow-Holm Bay) by subduction/collision events during the assembly of Gondwana supercontinent, and subsequently underwent w850 C granulite-facies metamorphosed during Neoproterozoic to Cambrian final collisional event. | Toshiaki Tsunogae Daniel J.Dunkley Kenji Horie Takahiro Endo Tomoharu Miyamoto Mutsumi Kato | 2014 | Geoscience Frontiers2014，5，2： | 5 |
| 3 | Petrology and phase equilibrium modeling of sapphirine + quartz assemblage from the Napier Complex, East Antarctica: Diagnostic evidence for Neoarchean ultrahigh-temperature metamorphism显示文摘A synthesis of the petrological characters of granulite facies rocks that contain equilibrium sapphirine t quartz assemblage from two localities(Tonagh Island(TI)and Priestley Peak(PP))in the Napier Complex,East Antarctica,provides unequivocal evidence for extreme crustal metamorphism possibly associated with the collisional orogeny during Neoarchean.The reaction microstructures associated with sapphirine t quartz vary among the samples,probably suggesting different tectonic conditions during the metamorphic evolution.Sapphirine and quartz in TI sample were probably in equilibrium at the peak stage,but now separated by corona of Grt + Sil + Opx suggesting near isobaric cooling after the peak metamorphism,whereas the Spr + Qtz + Sil + Crd + Spl assemblage replaces garnet in PP sample suggesting post-peak decompression.The application of mineral equilibrium modeling in NCKFMASHTO system demonstrated that Spr + Qtz stability is lowered down to 930℃ due to small Fe3+contents in the rocks(mole Fe2O3/(FeO + Fe2O3)0.02).The TI sample yields a peak p-T range of 950e1100 C and 7.5e11 kbar,followed by cooling toward a retrograde stage of 800e950 C and 8e10 kbar,possibly along a counterclockwise p-T path.In contrast,the peak condition of the PP sample shows 1000e1050 C and>12 kbar,which was followed by the formation of Spr + Qtz corona around garnet at 930e970 C and 6.7e7.7 kbar,suggesting decompression possibly along a clockwise p-T trajectory.Such contrasting p-T paths are consistent with a recent model on the structural framework of the Napier Complex that correlates the two areas to different crustal blocks.The different p-T paths obtained from the two localities might refect the difference in the tectonic framework of these rocks within a complex Neoarchean subduction/collision belt. | Hisako Shimizu Toshiaki Tsunogae M.Santosh | 2013 | Geoscience Frontiers2013，4，6： | 5 |
| 4 | Phase equilibrium modeling of incipient charnockite formation in NCKFMASHTO and MnNCKFMASHTO systems:A case study from Rajapalaiyam,Madurai Block,southern India显示文摘早期的 charnockites 在 mesoscopic 规模上代表 granulite 形成并且在在深外壳中理解液体过程收到了可观的注意。这里,我们在马杜赖·布洛克,在 Rajapalaiyam 从一个早期的 charnockite 地区报导新 petrological 数据南部的印度,并且基于矿物质阶段平衡建模和 pseudosection 分析讨论 petrogenesis。Rajapalaiyam 是在从的南部的印度的一个关键地区诊断矿物质集合为超离频温度(UHT ) 变态被报导了。对岩石是的 UHT 近似在我们在这报导的 Opx 免费的 Grt-Bt 片麻岩(Kfs +Pl +Qtz +Bt +Grt +Ilm + 山) 以内发生的 charnockite (Kfs +Qtz +Pl +Bt +Opx +Grt + Ilm ) 的补丁和透镜学习。矿物质平衡在 NCKFMASHTO 系统在 charnockitic 集合上当模特儿的申请产出 820 杯 ? 的一个磅范围 ?? 瑮湥楳敶瀠牡浡瑥牥 ?? 嘊湥慤丠癯 ? 汐瑵湯※ ? 牁 ? 慵傖悑 ??? 鎬?? 抑貮吗?? | Takahiro Endo Toshiaki Tsunogae M.Santosh E.Shaji | 2012 | Geoscience Frontiers2012，3，6： | 4 |
| 5 | Crystallization Conditions and Petrogenesis of the Paleoproterozoic Basement Rocks in Bangladesh:An Evaluation of Biotite and Coexisting Amphibole Mineral Chemistry显示文摘地下室从 Maddhapara 摇的 Paleoproterozoic (1.73 Ga ) ,孟加拉国表演包括闪长岩,石英闪长岩, monzodiorite,石英二长岩和花岗石的化学变化的一个大范围。这些由改变 quartz+plagioclase+K-feldspar+biotite+ 角闪石的比例组成吗?? | Ismail Hossain Toshiaki Tsunogae | 2014 | Journal of Earth Science2014，25，1： | 3 |
| 6 | Fluid-induced high-temperature metasomatism at Rundv?gshetta in the Lützow-Holm Complex, East Antarctica: Implications for the role of brine during granulite formation显示文摘We report new petrological, phase equilibria modeling, and fluid inclusion data for pelitic and mafic granulites from Rundv?gshetta in the highest-grade region of the Neoproterozoic Lützow-Holm Complex(LHC),East Antarctica, and provide unequivocal evidence for fluid-rock interaction and high-temperature metasomatism in the presence of brine fluid. The studied locality is composed dominantly of well-foliated pelitic granulite(K-feldspar+quartz+sillimanite+garnet+ilmenite) with foliation-parallel bands and/or layers of mafic granulite(plagioclase+orthopyroxene+garnet+ilmenite+quartz+biotite). The boundary between the two lithologies is defined by thin(about 1 -20 cm in thick) garnet-rich layers with a common mineral assemblage of garnet+plagioclase+quartz+ilmenite+biotite ? orthopyroxene. Systematic increase of grossular and decrease of pyrope contents in garnet as well as decreasing Mg/(Fe+Mg) ratio of biotite from the pelitic granulite to garnet-rich rock and mafic granulite suggest that the garnet-rich layer was formed by metasomatic interaction between the two granulite lithologies. Phase equilibria modeling in the system NCKFMASHTO demonstrates that the metasomatism took place at 850 -860℃, which is slightly lower than the peak metamorphism of this region, and the modal abundance of garnet is the highest along the metapeliteemetabasite boundary(up to 40%), which is consistent with the field and thin section observations. The occurrence of brine(7.0 -10.9 wt.% Na Cleqfor ice melting or 25.1 -25.5 wt.% NaC leqfor hydrohalite melting) fluid inclusions as a primary phase trapped within plagioclase in the garnet-rich layer and the occurrence of Cl-rich biotite(Cl = 0.22 -0.60 wt.%) in the metasomatic rock compared to that in pelitic(0.15 -0.24 wt.%) and mafic(0.06-0.13 wt.%) granulites suggest infiltration of brine fluid could have given rise to the high-temperature metasomatism. The fluid might have been derived from external sources possibly related to the formation of major suture zones formed during the Gondwana amalgamation. | Kazuki Takahashi Toshiaki Tsunogae Emmanuel Nwachukwu Ugwuonah | 2018 | Geoscience Frontiers2018，9，5： | 2 |
| 7 | High fluorine pargasites in ultrahigh temperature granulites from Tonagh Island in the Archean Napier Complex,East Antarctica显示文摘 | Toshiaki Tsunogae Yasuhito Osanai Masaaki Owada | 2003 | Lithos2003，70，12： | 1 |
| 8 | Corundum+quartz and Mg-staurolite bearing granulite from the Limpopo Belt,southern Africa:implications for a p-T path显示文摘 | Toshiaki Tsunogae Dirk D van Reenen | 2007 | Lithos2007，，： | 1 |
| 9 | Discovery of sapphirine-bearing Mg-Al granulites in the North China Craton:implications for Paleoproterozoic ultrahigh-temperature metamorphism显示文摘 | Santosh M Tsunogae T Li J.H Liu S.J | | 0，，3： | 1 |
| 10 | High alumina orthopyroxenes from Ganguvarpatti granulites,southern India:implications for ultrahigh-temperature metamorphism显示文摘 | Tamashiro I Santosh M Morimoto T Tsunogae T | | 0，，： | 1 |
| 11 | First report of sapphirine + quartz assemblage from southern India:implications for ultrahigh-temperature metamorphism显示文摘 | Tateishi K Tsunogae T Santosh M Janardhan A.S | | 0，，： | 1 |
| 12 | Very high-density carbonic fluid inclusions in sapphirine-bearing granulites from Tonagh Island in the Archean Napier Complex,East Antarctica:implications for CO2 infiltration during ultrahigh-temperature(T 》 1,100 ℃)metamorphism显示文摘 | Tsunogae T Santosh M Osanai Y Owada M Toyoshima T Hokada T | | 0，，： | 1 |
| 13 | Polyisobutylene-containing hlock polymers hy sequential monomer addition( X ) : Synthe- sis of poly ( α-methylstyrene-b-isnbutylene-b-α-methylstyrene ) thermoplastic elastomers显示文摘 | Tsunogae Yasuo Kennedy J P | 1994 | Journal of Polymer Science( part A ) : Polymer Chemistry1994，32，3： | 1 |
| 14 | Petrochemistry and Zircon U-Pb Geochronology of Felsic Xenoliths in Late Cenozoic Gem-Related Basalt from Bo Phloi Gem Field, Kanchanaburi, Western Thailand显示文摘The Cenozoic basalts exposed in Bo Phloi Gem Field,Kanchanaburi Province,western Thailand are a host to different gem materials(e.g.,sapphire,black spinel,black pyroxene and zircon)as well as other xenocrysts and xenoliths from the deep-seated formations onto the earth surface.However,only felsic xenoliths have never been investigated and reported in detail though they are in fact significant evidence of ancient tectonic processes of this area.In this study,the felsic xenoliths were sampled and classified,on the basis of petrochemistry,into granite,syenogranite,and syenite.However,they contain similar mineral assemblages including essentials of quartz,K-feldspar,and plagioclase with different proportions and accessories of biotite,zircon,and opaque minerals.Moreover,large phenocrysts of K-feldspar and plagioclase commonly present as a primary texture which are frequently corroded and replaced by‘sieved texture’with secondary cumulative fringe of tiny feldspar and quartz.These secondary textures clearly indicate quenching after re-heating during transportation by basaltic magma.Geochemical analyses indicate that the alkaline and peraluminous magma show enrichment of Rb and depletion of Ba,Nb,Ta,Ti with steep slope of LREE/HREE enrichment patterns.These evidences suggest low-degree partial melting of crustal materials related to the collisional S-type granite magmatism.In addition,U-Pb dating of zircon from a felsic xenolith yields 211.6±1.3 Ma comparable to the Late Triassic magmatism of the central belt granite in this region which is resulted from the collision between Sibumasu and Indochina terranes. | Alongkot Fanka Chidchanok Kasiban Toshiaki Tsunogae Yukiyasu Tsutsumi Chakkaphan Sutthirat | 2021 | Journal of Earth Science2021，32，4： | 1 |
| 15 | Paleoproterozoic ultrahightemperature granulites in the North China Craton:implications for tectonic models on extreme crustal metamorphism显示文摘 | Santosh M Liu S.J Tsunogae T Li J.H | | 0，，： | 1 |
| 16 | Antarctica - A window to the far off land显示文摘The Antarctic continent and surrounding oceans,which are cold and isolated from human activities,constitute a key region for multidisciplinary investigations.Since the early interest during the International Geophysical Year(IGY)during 1957e1958,numerous scientifc studies have so far been carried out in Antarctica | Toshiaki Tsunogae Hisako Shimizu | 2013 | Geoscience Frontiers2013，4，6： | 1 |
| 17 | Very high-density carbonic fluid inclusions in sapphirine-bearing granulites from Tonagh Island in the Archean Napier Complex, East Antarctica: implications for CO2 infiltration during ultrahigh-temperature (T>1,100?°C) metamorphism显示文摘 | Toshiaki Tsunogae M. Santosh Yasuhito Osanai Masaaki Owada Tsuyoshi Toyoshima Tomokazu Hokada | 2002 | Contributions to Mineralogy and Petrology2002，，3： | 1 |
| 18 | Discovery of Sapphirine-bearing Mg-A1 Granulites in the North China Craton:Implications for Paleoproterozoic Ultra- high Temperature Metamorphism显示文摘 | SANTOSH M TSUNOGAE T LI J H | 2007 | Gondwana Re- search2007，11，3： | 1 |
| 19 | Synthesis, characterization and properties of crystalline poly ( endo - dicyclo- pentadiene) resin made via cis and isoselective bulk ring- opening metathesis polymerization显示文摘 | Shigetaka Hayano Tomoo Sugawara Yasuo Tsunogae | 2006 | Journal of Polymer Science : Part A : Polymer Chemistry2006，44，9： | 1 |
| 20 | Discovery of sapphir- ine-bearing Mg-A1 granulites in the North China Cratom Im- plications for Paleoproterozoic ultrahigh temperature meta- morphism显示文摘 | Santosh M Tsunogae T Li J H | 2007 | Gondwana Research2007，11，3： | 1 |
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