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| 1 | Discovery of ultrahigh-pressure magnesite-bearing garnet lherzolite (>3.8 GPa) in the Altyn Tagh, Northwest China显示文摘Magnesite-bearing garnet Iherzolite from the Altyn Tagh, associated with garnet pyroxenite, and garnet-bearing felsic gneiss, crops out as lenses in Proterozoic gneiss about 100 km east of the Jianggelasayi River. The garnet Iherzolite, together with the eclogite in western Jianggelasayi, composes a high-pressure to ultrahigh-pressure metamorphic belt in the southern margin of the Altyn Tagh. Parageneses of minerals from magnesite-bearing garnet Iherzolite indicate that the rock evolved a multi-stage metamorphism. The peak-stage metamorphism produces an assemblage of Grt+Ol+Opx+Cpx±Mgs, in which A12O3 content of Opxis very low (0.30-0.66wt%). The calculated P-T condition of the peak stage is 3.8-5.lGPa and 880-970°C, some exsolution rods of clinopyroxene and rutile occur in the Grt and magnesite is rimed by dolomite and orthopyroxene, all implying that the peak stage was a UHP metamorphic process. Together with regional geological studies, isotopic dating and the discovery of coesite inclusions in | LIU Liang, SUN Yong, XIAO Peixi, CHE Zicheng, LUO Jinhai, CHEN Danling, WANG Yan, ZHANG Anda, CHEN Liang & WANG YongheKey Laboratory of Continental Dynamics of the Ministry of Education, Northwest University, Xi’an 710069, China The Northwest Institute of | 2002 | Chinese Science Bulletin2002，47，11： | 69 |
| 2 | Remelting of subducted continental lithosphere: Petrogenesis of Mesozoic magmatic rocks in the Dabie-Sulu orogenic belt显示文摘The Dabie-Sulu orogenic belt was formed by the Triassic continental collision between the South China Block and the North China Block. There is a large area of Mesozoic magmatic rocks along this orogenic belt, with emplacement ages mainly at Late Triassic, Late Jurassic and Early Cretaceous. The Late Triassic alkaline rocks and the Late Jurassic granitoids only crop out in the eastern part of the Sulu orogen, whereas the Early Cretaceous magmatic rocks occur as massive granitoids, sporadic intermedi- ate-mafic intrusive and volcanic rocks throughout the Dabie-Sulu orogenic belt. Despite the different ages for their emplacement, the Mesozoic magmatic rocks are all characterized not only by enrichment of LREE and LILE but depletion of HFSE, but also by high initial Sr isotope ratios, low εNd(t) values and low radiogeneic Pb isotope compositions. Some zircons from the Jurassic and Cretaceous granitoids contain inherited magmatic cores with Neoprotozoic and Triassic U-Pb ages. Most of the Cretaceous mafic rocks have zircon δ18O values and whole-rock δ13C values lower than those for the normal mantle. A systematic comparison with adjacent UHP metaigneous rocks shows that the Mesozoic granitoids and mafic rocks have elemental and isotopic features similar to the UHP metagranite and metabasite, respectively. This indicates that these magmatic and metamorphic rocks share the diagnostic features of lithospheric source that has tectonic affinity to the northern edge of the South China Block. Their precursors underwent the UHP metamorphism and the post-collisional anatexis, respectively at different times and depths. Therefore, the Mesozoic magmatic rocks were derived from anatexis of the subducted continental lithosphere itself beneath the collision-thickened orogen; the geodynamic mechanism of the post-collisional magmatisms is tectonic collapse of orogenic roots in response to lithospheric extension. | ZHAO ZiFu ZHENG YongFei | 2009 | Science China Earth Sciences2009，52，9： | 60 |
| 3 | LA-ICP-MS zircon U-Pb dating for high-pressure basic granulite from North Qinling and its geological significance显示文摘A combined study of CL imaging, LA-ICP-MS U-Pb dating and trace element analysis were carried out for zircon grains from high-pressure basic granulite at Song- shugou in North Qinling. The zircons display core-rim in- ternal texture. The cores are made up of sector or planar domains, partially displaying weak zoning or misty texture, and have the feature of low content of Th, U, REE, HREE, low Th/U ratio and high (Nd/Yb)N ratio, and the REE pat- tern typical for zircon coexisting with garnet. These features indicate the metamorphic genesis for the zircon cores. The rims have narrow light margins (<30 μm in width) around the cores and boundaries between core and rim are rounded or lough-like, indicating that the rims were formed during retrograde metamorphism. U-Pb isotopic data of 24 spots from the cores of 11 zircon grains yield a 206 Pb/238U weighted average age of 485±3.3 Ma, which is interpreted as the peak metamorphic age of high-pressure (HP) basic granulite. This age is well consistent within error with that of ultra- high-pressure (UHP) eclogite and its country rock gneiss (507±37 Ma) that occur at the north side of the Qinling Group, possibly indicating the occurrence of two contempo- raneous Early-Paleozoic HP to UHP metamorphic rock belts on the north and south sides of the Qinling Group. Combin- ing with the regional geological studies and the distribution of Early-Paleozoic granites related to subduction and colli- sion, the two HP to UHP metamorphic belts may be the products of continental crust bi-directional deep subduction toward Qinling micro-block caused by the subduction and collision of Paleozoic Qinling ocean and Erlangping ocean, respectively. | CHENDanling LIULiang SUNYong ZHANGAnda LIUXiaoming LUOJinhai | 2004 | Chinese Science Bulletin2004，49，21： | 41 |
| 4 | Evidence for UHP metamor-phism of eclogites from the Altun Mountains显示文摘Ultrahigh pressure (UHP) metamorphism refers to metamorphism that has occurred at pressures for the stability of coesite. The polycrystalline quartz inclusions showing the characteristic texture within garnets of eclogites indicates the pre-existence of coesites under the peak meta-morphic condition. The unusual exsolution textures in om-pacites and apatites, and the pressure estimations of phengite-bearing eclogites have been taken to provide further proof of eclogite formation under the UHP conditions. Combined with the fact that coesites have been observed in country rocks of eclogites in North Qaidam Mountains, another UHP metamorphic belt cut by the large-scale strike-slip fault in the Altun-North Qaidam area of China is confirmed. | Jianxin Zhang Jingsui Yang Zhiqin Xu Fancong Meng Haibing Li Rendeng Shi | 2002 | Chinese Science Bulletin2002，47，9： | 33 |
| 5 | Ultra-high pressure metamorphism of granitic gneiss in the Yinggelisayi area, Altun Mountains, NW China显示文摘 | LIU Liang, SUN Yong, LUO Jinhai, WANG Yan, CHEN Danling & ZHANG Anda The Key Laboratory of Continental Dynamics, Ministry of Education,Department of Geology, Northwest University, Xi抋n 710069, China | 2004 | Science China Earth Sciences2004，47，4： | 27 |
| 6 | Hydroxyl in continental deep subduction zone: Evidence from UHP eclogites of the Dabie Mountains显示文摘Infrared spectra in the region of 3 000 to 4 000 cm-1 have been measured by an FTIR spectrometer on minerals in UHP eclogites from the Bixiling and Shuanghe areas, the Dabie Mountains. It is shown that omphacite is the most important hydrous mineral (100-200 μg/g) in UHP eclogites. Garnet and quartz contain virtually no H2O or OH. Accessory mineral rutile contains a significant amount of OH (>1 000 μg/g). Coesite gives no indication of the presence of OH but apparent H2O bands. The results have considerable implications for existing forms and contents of hydroxyl in the continental deep subduction zone, the eastern Dabie Mountains. | HarryW.Green | 2001 | Chinese Science Bulletin2001，46，7： | 28 |
| 7 | SHRIMP U-Pb zircon ages for the UHP metamorphosed granitoid gneiss in Altyn Tagh and their geological significance显示文摘Cathodoluminescence (CL) and mineral inclu- sions investigations show that zircons from Yinggelisayi UHP metamorphosed granitoid gneiss in Altyn Tagh exhibit core-mantle-rim internal texture with magmatic residual core, the metamorphic overgrowth mantle and the late stage rim. SHRIMP 206 Pb/238U ages of 5 spots from the mantles vary from 484±11 to 491±12 Ma with Th/U ratios from 0.01 to 0.03, yielding a weighted average age of 487±10 Ma (2σ ) as the age of the UHP metamorphosed granitoid gneiss. The 206Pb/238U ages from the oscillatory zoned cores range from 809±19 to 885±21 Ma with Th/U ratios ranging from 0.42 to 0.83, which are interpreted as the crystallization age of the protolith of the granitoid gneiss. The metamorphic age (487±10 Ma) of the UHP metamorphosed granitoid gneiss, well consistent with the peak metamorphic age (about 500 Ma) of the UHP eclogite with crystallization age of the proto- lith between 809±19 and 885±21 Ma at Jianggelisayi in west- ern Altyn Tagh, indicates the existence of a UHPM belt along the south margin of the Altyn Tagh as a result of deep sub- duction during Early Paleozoic age of previously existing continental crust. | ZHANGAnda LIULiang SUNYong CHENDanling WANGYan LUOJinhai | 2004 | Chinese Science Bulletin2004，49，23： | 21 |
| 8 | The Dabie-Sulu UHP rocks belt:review and prospect显示文摘The new results in the studies of the Dabie-Sulu UHP rocks belt during the past 5 years were summarized and discussed. The discussion included the following key points: ( i ) UHP eclogite has two kinds of country rocks, with one being UHP eclogite facies rocks and the other non-UHP granitic gneiss. ( ii ) The FeTiO3 in olivine indicated exsolution at depth of 300-400 km. However, the key point is to prove the peridotite in which the FeTiO3 in olivine was found once had been subducted down that depth. (iii ) UHP hydrous phase evidenced that fluids had taken part in the UHP metamorphism, while the meter-scale inhomogeneous distribution of O-, C-isotope indicated no fluid activity in the deep subduction environment. (iv ) No agreement has been arrived on many problems related to the tectonic background of the UHP rocks, such as 'whether or not ophiolitic rocks there exist now?', 'when did UHP metamorphism proceed?', 'what is the subdution polarity?', etc. ( V ) How did the UHP rocks exhume from mantle | Bolin Cong Qingchen Wang | 1999 | Chinese Science Bulletin1999，44，12： | 21 |
| 9 | Subduction of Continental Crust in the Early Palaeozoic North Qaidam Ultrahigh-Pressure Metamorphic Belt, NW China:Evidence from the Discovery of Coesite in the Belt显示文摘Coesite was discovered as inclusions in zircon separates from pelitic gneiss associated with a large eclogite body in the North Qaidam ultrahigh-pressure (UHP) terrane. Some graphite inclusions were also found. This finding suggested the occurrence of in-situ UHP metamorphism and that the terrane was most likely recrystallized at pressures below the diamond stability field. It supported other previous indirect UHP evidence, such as polycrystalline quartz inclusions in eclogitic garnet, quartz lamellae in omphacite and P-T estimates for both eclogite and garnet peridotite. The U-Pb and Sm-Nd ages of the North Qaidam eclogite indicated that subduction of continental crust occurred in the Early Palaeozoic, which probably recorded a collision between the Sino-Korean and Yangtze plates. | 杨经绥 许志琴 宋述光 张建新 吴才来 史仁灯 李海兵 Maurice BRUNEL Paul TAPPONNIER | 2002 | Acta Geologica Sinica(English Edition)2002，76，1： | 14 |
| 10 | Zircon U-Pb SHRIMP dating of the Yematan batholith in Dulan, North Qaidam, NW China显示文摘The Yematan batholith crops out over 120 km2 in the North Qaidam ultrahigh pressure (UHP) metamorphic belt. It consists of granodiorite, monzogranite and biotite granite and forms an irregular intrusion into Neoproterozoic gneiss that has undergone Caledonian UHP metamorphism. Zircons from the Yematan granodiorite yield a SHRIMP U-Pb age of 397? Ma. These granitic rocks have geochemi- cal characteristics intermediate between I- and S-type gran- ites, and are post-collisional. We suggest that the Yematan granitic rocks were formed during the last exhumation event of the North Qaidam UHP belt. | WUCailai YANGJingsui JosephL.Wooden SHIRendeng CHENSongyong AndersMeibom ChrisMattinson | 2004 | Chinese Science Bulletin2004，49，16： | 14 |
| 11 | Tectonic implication of UHP rocks from the Dabie Mountains显示文摘Petrological, mineralogical, isochronological data accumulated in the last 4 years are summarized. The variations of lithology and protolith. as well as block-in-matrix structure of UHP (uHrahigh-pressure) rocks imply a metamorphic melange. Clockwise P-T paths of UHP rocks indicate that their formation and exhumation are related to collisional orogeny. Isochronological data indicate that the peak UHP metamorphism was during the Middle-Late Triassic. The exhumation rates, estimated according to P-T-t paths, show a multiple exhumation stages, with a high exhumation rate (3.3-3.6 mm/a) in the Middle-Late Triassic, a lower rate (0.7-1.1 mm/a) in the Early Jurassic, and a very low rate (0.15 mm/a) in the Middle Jurassic to Early Cretaceous. With these constraints, a hypothetical cross-section of the Dabie orogenic belt is constructed. | 王清晨 从柏林 | 1996 | Science China Earth Sciences1996，39，3： | 14 |
| 12 | Progress and Controversy in the Study of HP-UHP Metamorphic Terranes in the West and Middle Central China Orogen显示文摘During the past ten years, various types of HP-UHP metamorphic rocks have been dis-covered in the South Altyn Tagh, the North Qaidam and the North Qinling (秦岭) in the West and Middle Central China orogen. The UHP rocks, as lentoid bodies in regional gneisses, include eclogite (garnet-bearing pyroxenite), garnet peridotite and various pelitic or felsic gneisses. There are many re-cords of minerals and microstructures of exsolution indicate the UHP metamorphism, such as coesite (or its pseudomorph), diamond, exsolution of clinopyroxene/amphibole/+rutile or rutile+quartz+apatite in garnet, exsolution of quartz in omphacite and exsolution of kyanite+spinel in precursor stishovite.The discovery of microstructure evidence for the presence of precursor stishovite in typical Al-rich gneiss from the South Altyn Tagh reveals continental subduction and exhumation to and from a depth of more than 350 km. It is the petrological record of the deepest subduction and exhumation of continental rock in the world. The in situ zircon U-Pb dating using LA-ICP-MS or SHRIMP methods shows that the meta-morphic ages of the HP-UHP rocks in the South Altyn Tagh, the North Qaidam and the North Qinling are 475–509, 420–457, and 485–514 Ma, respectively. The metamorphic ages of HP-UHProcks in the North Qaidam are 20–80 Ma younger than those in the South Altyn Tagh and the North Qinling, and the metamorphic ages do not systematically increase or decrease from the South Altyn Tagh through the North Qaidam to the North Qinling. The absence of time transgressive variety of the metamorphism in the three regions does not support the hypothesis that the HP-UHP rocks in these regions form the same HP-UHP metamorphic zone. And the HP-UHP rocks in these regions can not be simply correlated to the collision between the North China plate and the South China plate. At present, the study of the HP-UHP rocks in the West and Middle Central China orogen faces several key issues or challenges, such as: (1) the continental subduction to the mantle depth of stishovite stability field (>9 GPa) is occasional or universal; (2) the mechanism of exhumation for the continental rocks subducted to the depth of stishovite stability field (>300 km); (3) the tectonic setting and geodynamical mechanism of producing the HP-UHP metamorphic zones in the South Altyn Tagh, the North Qaidam and the North Qinling. Further studies aiming at these problems will make important progress not only in metamorphism of the HP-UHP rocks in the West and Middle Central China orogen, but also in continental deep subduction and exhumation in solid earth science. It will also contribute to the establishment of the theory of continental deep subduction. | 刘良 杨家喜 陈丹玲 王超 张成立 杨文强 曹玉亭 | 2010 | Journal of Earth Science2010，21，5： | 13 |
| 13 | Oxygen and carbon isotope composition from the UHP Shuanghe marbles, Dabie Mountains, China显示文摘Investigations on the oxygen and carbon isotope compositions from the ultrahigh-pressure (UHP)-metamorphosed Shuanghe marbles, that occur as a member of a UHP slab, show that the δ18O values range from +11.1‰ to+20.5‰ SMOW, and δ13C from+1.0‰ to+5.7‰ PDB, respectively. The variations in isotope compositions show a centimeter scale of homogeneity and a heterogeneity of regional scale larger than 1 meter. In contrast to the eclogite marbles from Norway, the Shuanghe marbles have inherited the carbon isotope compositions from their sedimentary precursor. The δ13C shows positive correlation to the content of dolomite. The depletion in 18O, compared with the protolithic carbonate strata, might result from three possible geological processes: 1) exchanging oxygen isotope with meteoric water before the UHP metamorphism, 2) decarbonation during the UHP metamorphism, and 3) exchanging oxygen isotope with country gneiss at local scale during retrograde metamorphism. It seems that the | 王清晨 Douglas Rumble | 1999 | Science China Earth Sciences1999，42，1： | 10 |
| 14 | 北大别超高压榴辉岩的快速折返与缓慢冷却过程显示文摘岩石学研究表明,北大别超高压榴辉岩经过了超高压和高压榴辉岩相变质作用以及麻粒岩相叠加和角闪岩相退变质作用。其中,高压麻粒岩相和角闪岩相变质阶段形成的后成合晶以及石榴子石和单斜辉石等矿物中成分分带的存在,证明该区榴辉岩经历了一个快速折返过程;而不同变质阶段的温度、压力和形成时代,却反映该区榴辉岩在峰期超高压变质作用之后又经历了一个缓慢冷却过程。超高压岩石折返期间的缓慢冷却过程也许正是北大别长期难以发现柯石英和有关超高压证据的重要原因。因此,本文为大别山不同超高压岩片的差异折返模型的建立提供了新的证据。 | 刘贻灿 古晓锋 李曙光 | 2009 | 岩石学报2009，25，9： | 8 |
| 15 | 超声波探伤不合格T91钢棒材的分析和工艺改进显示文摘试验T91钢(/%:0.10C,0.30Si,0.45Mn,0.012P,0.005S,8.90Cr,0.95Mo,0.08Nb,0.22V)的生产流程为60 t UHP EAF-AOD-LF-VD-240 mm×240 mm坯连铸-加热-连轧。对超声波探伤不合格的T91钢Φ90 mm材低倍检验结果表明,钢材存在中心裂纹和孔洞;通过金相分析得出,缺陷出现三种特征:(1)过烧型孔洞和裂纹;(2)连铸坯带来的轴心晶间裂纹;(3)铸坯的缩孔。通过连铸Ⅰ、Ⅱ和Ⅲ区二冷水量分别由原28、31和17 L/min优化成15、18和10 L/min,并通过控制连铸坯加热温度,使连铸坯中心的等轴晶比率由原14%提高至25%以上,铸坯的中心裂纹级别由2.0降至0.5以下,T91钢材的超声波探伤不合格率由5%降至0.2%以下。 | 邢国成 刘桂江 李涛 程丽杰 孙大利 | 2019 | 特殊钢2019，40，3： | 7 |
| 16 | Seismic tomography showing subduction and slab breakoff of the Yangtze block beneath the Dabie-Sulu orogenic belt显示文摘Seismic tomography reveals that a subducted ancient block has been preserved beneath the Moho of the Dabie-Sulu orogenic belt. Taking into account of geological and geochronological data, we inferred from the tomographic images that the Yangtze block was subducted northward beneath the Sino-Korean block and broken off at the depth <200 km during 200-190 Ma. The slab breakoff of the Yangtze block is the most important dynamic mechanism to control the exhumation of UHP rocks. | Peifen Xu Ruomei Sun Futian Liu Qingchen Wang Bolin Cong | 2000 | Chinese Science Bulletin2000，45，1： | 7 |
| 17 | Oxygen isotope compositions of eclogites in Rongcheng,Eastern China显示文摘Collected from the Rongcheng region, Shan-dong Province, the three types of eclogites suffering the UHP (i.e. ultra-high pressure) metamorphism have obviously dif-ferent oxygen isotope compositions. The eclogites occurring in regional orthogneisses and ultramafic rocks have the oxy-gen isotope compositions of normal eclogites in the world,but the eclogites existing in marbles are extremely enrichedin 18O. By applying oxygen isotope geothermometry, for theall types of eclogites, the temperature estimates of quartz-garnet pair, in principle, indicate the formation temperatures of eclogites, so that the peak-metamorphic temperatures are estimated to be averagely little higher than 800℃, which are consistent with the estimates by using other geothermome-ters according to cation partitioning between coexistingphases. The d 18O values of eclogitic inclusions hosted inmarbles from Yangguantun, Rongcheng region, are farhigher than the values of eclogites (including eclogitic inclu-sions in marbles) from the Dabieshan and other places of the Sulu. The oxygen isotope compositions of various mineralsindicate that the formation temperatures of eclogites fromthe Rongcheng region, in general, are higher than that from the Dabieshan and the southwestern part of the Sulu, but the dispersive temperatures estimated by different mineral pairs probably reflect that the UHP eclogites from the Rongcheng region generally suffered overprinted metamorphisms dur-ing the exhumation. | CHU Xuelei1,2, GUO Jinghui1,2, FAN Hongrui1,2 & JIN Chengwei1 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. Key Laboratory for Mineral Resources Research, Chinese Academy of Sciences, Beijing 100101, China Correspondence should be addressed to Chu Xuelei | 2003 | Chinese Science Bulletin2003，48，4： | 7 |
| 18 | Metamorphic P-T Path Differences between the Two UHP Terranes of Sulu Orogen, Eastern China: Petrologic Comparison between Eclogites from Donghai and Rongcheng显示文摘The Sulu Orogen constitutes the eastern part of the Sulu-Dabie Orogen formed by Triassic collision between the Sino-Korean and Yangtze plates. An HP Slice Ⅰ and two UHP slices Ⅱ and Ⅲ with contrasting subduction and exhumation histories within the Sulu Orogen were postulated. This study presents the metamorphic P-T paths of eclogites from the two UHP belts constructed by petrography, mineral chemistry and Perple_X P-T pseudosection modeling in the MnC(K)NFMASHO system. Eclogites from Slice Ⅲ mainly consist of omphacite, garnet and quartz, with minor rutile, ilmenite, amphibole and phengite. Eclogites from Slice Ⅱ show a porphyroblastic texture with epidote porphyroblasts and garnet, omphacite, phengite, quartz and rutile in matrix. Pseudosection modeling reveals that eclogites from Slice Ⅱ witness a peak metamorphism of eclogite-facies under conditions of 3.1–3.3 GPa and 660–690 ℃, and a retrograde cooling decompression process. The eclogites from Slice Ⅲ record a heating decompressive P-T path with a peak-P stage of 3.2 GPa and 840 ℃ and a peak-T stage of 2.4 GPa and 950 ℃, suggesting an apparent granulite-facies metamorphism overprint during exhumation. Both eclogites recorded clockwise P-T paths with peak P-T conditions suggesting a subduction beneath the Sino-Korean Plate to ~100–105 km depth. Combined with tectonic scenarios from previous studies, it is concluded that the two UHP crustal slices in the Sulu terrane have a similar geodynamic evolution, but the UHP rocks in Slice Ⅱ exhumed after the eclogitic peak-pressure conditions earlier than that of Slice Ⅲ. The existence of Slice Ⅱ diminished the buoyancy force on Slice Ⅲ, resulting in a granulite-facies overprint on Slice Ⅲ. The Sulu orogenic belt is made up of different crustal slices that underwent different subduction and exhumation histories, rather than a single unit. | Zhuoyang Li Yilong Li Jan R.Wijbrans Qijun Yang Hua-Ning Qiu Fraukje M.Brouwer | 2018 | Journal of Earth Science2018，29，5： | 6 |
| 19 | Zircon SHRIMP U-Pb age of garnet olivine pyroxenite at Hujialin in the Sulu terrane and its geological significance显示文摘Garnet olivine pyroxenite at Hujialin is situated in the Sulu ultrahigh pressure (UHP) metamorphic belt, Shandong Province. Most of the zircon separated from the rock is well crystallized, prismatic and granular with a length to width ratio of 1︰1.3—1︰2.5. CL and BSE images show the magmatic oscillatory zoning in the zircon. Th/U ratio ranges from 0.99 to 2.81. These suggest a magmatic origin for the zircon studied. SHRIMP dating yields 206Pb/238U ages of 207—223 Ma, with a weighted average of 2163 Ma. This age corresponds to zircon growth during exhumation of UHP slab and thus the timing of amphibo-lite-facies retrogression. The garnet olivine pyroxenite was wrapped and brought to the crust by the UHP slab during exhumation, and then suffered from metasomatism by fluid from the UHP slab itself. The zircon U-Pb age records the timing of the crystallization of metasomatic melt. Therefore, fluid that was released during exhumation of deeply sub-ducted continental slab may be the important source for zircon growth. | GAOTianshan CHENJiangfeng XIEZhi YANGShenghong YUGang | 2004 | Chinese Science Bulletin2004，49，20： | 5 |
| 20 | Role of Water in Deformed Omphacite in UHP Eclogite from the Dabie Mountains,Eastern China显示文摘Omphacite grains from UHP eclogite of the Dabie Mountains in eastern China are elongated and showstrong lattice preferred orientations (LPOs). Observations by the transmission electron microscopy (TEM) identified notonly structures of plastic deformation occurring as free dislocation, dislocation loops and dislocation walls, but alsobubbles of water present in the deformed omphacite. The bubbles attach to the dislocation loops which are often connectedto one another via a common bubble. Using infrared spectroscopy (IR), two types of hydrous components are identified ashydroxyl and free-water in the omphacite. An analysis of deformation mechanism of microstructure in omphacite suggeststhat the mineral deformed plastically under UHP metamorphic conditions by dislocation creep through hydrolitic weakening. | SUWen YOUZhendong CONGBolin YEKai | 2003 | Acta Geologica Sinica(English Edition)2003，77，3： | 5 |
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