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排序方式: 共有108条查询结果,搜索用时 15 毫秒
71.
Fluid inclusions hidden in coesite-bearing zircons in ultrahigh-pressure metamorphic rocks from southwestern Sulu terrane in eastern China 总被引:14,自引:0,他引:14
LIU Fulai & XU Zhiqin Institute of Geology Chinese Academy of Geological Sciences Beijing China 《科学通报(英文版)》2004,49(4):396-404
Fluidinclusionstudiesarepowerfultoolsfordeci-pheringthefluidevolutionandfluid-rockinteractionin-volvingultrahigh-pressure(UHP)metamorphismofcrustalrocksatmantledepths.Thecompositionandprop-ertiesoffluidinclusionscanreflectthephysico-chemicalconditionsofthefluidsduringplatesubduction,UHPmetamorphismandexhumation.However,UHPmeta-morphicrockscommonlyexperiencedconsiderablede-compressionrelatedtotherapidexhumationprocess.Thishascausedtheinternalpressureoftheinclusionstrappedinthemetamorphicmin… 相似文献
72.
SHRIMP U-Pb zircon ages for the UHP metamorphosed granitoid gneiss in Altyn Tagh and their geological significance 总被引:3,自引:0,他引:3
ZHANG Anda LIU Liang SUN Yong CHEN Danling WANG Yan & LUO Jinhai Key Laboratory of Continental Dynamics of the Ministry of Education Department of Geology Northwest University Xi’an China Correspondence should be addressed to Liu Liang 《科学通报(英文版)》2004,49(23):2527-2532
Different types of UHP metamorphic rocks havebeen recently discovered in the Altyn Tagh[1—4], the north-ern margin of Qadam Basin[5—7], the southwestern Tian-shan Mountains[8,9] and the northern Qinling Moun-tains[10,11] in Central and Western China. And these areashave attracted focus attention of geologists at home andabroad to the studying of UHP metamorphism and conti-nental deep subduction. However, as newly discoveredUHP metamorphic terranes, some questions have beenarisen abou… 相似文献
73.
WUCailai YANGJingsui JosephL.Wooden SHIRendeng CHENSongyong AndersMeibom ChrisMattinson 《科学通报(英文版)》2004,49(16):1736-1740
The Yematan batholith crops out over 120 km^2 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 3 Ma. These granitic rocks have geochemical characteristics intermediate between I- and S-type granites, and are post-collisional. We suggest that the Yematan granitic rocks were formed during the last exhumation event of the North Qaidam UHP belt. 相似文献
74.
本文从蔚县煤田煤的自身特性即显微煤岩组分的不同,各种组分的百分含量不同,导致挥发产生率(V_r)的不同入手,以此探索了该煤田出现的“反希尔特定律”的现象.同时指出显微煤岩组分是煤变质因素之一. 相似文献
75.
Determination and geological significance of the eclogites from the northern Dabie Mountains, central China 总被引:8,自引:0,他引:8
Numerous eclogite-amphibolite blocks have been found along the Mayanling fault in the northern Dabie complex. Most of the
eclogites are strongly retrograded and contain garnet, rutile and the amphibole-plagioclase symplectite. The occurrence of
these eclogites may have something to do with the inverted movement of the Mayanling thrust fault. 相似文献
76.
Discovery and study of high-pressure basic granulites in Songshugou area of Shangnan, East Qinling 总被引:4,自引:0,他引:4
《科学通报(英文版)》1995,40(5):400-400
77.
秦岭沙沟韧性剪切带长英质糜棱岩的变形变质作用 总被引:1,自引:0,他引:1
对秦岭沙沟韧性剪切带的主要岩石类型长英质糜棱岩的组构和变质矿物组合研究表明,其至少经历了3期构造事件,主变形期发生在角闪岩相条件下,温度约530℃;持续的岩浆分融/侵入和剪切作用是形成该糜棱岩的重要机制。 相似文献
78.
本文陈述了应用Traube定律[1]通过煤真密度与其化学组成的关系建立起来的煤结构分析方法,研究了煤大分子结构随煤变质加深的变化规律,对用煤化学组成和煤结构划分煤变质程度等问题进行了初步探讨。 相似文献
79.
YANG Jingsui BAI Wenji FANG Qingsong YAN Binggang SHI Nicheng MA Zhesheng DAI Mingquan XIONG Ming 《自然科学进展(英文版)》2003,13(7):528-531
Silicon(Si)-rutile separated from the Luobusa podiform chromitite in the Yarlung Zangbo ophiolite of southern Tibet is typically about 50 μm×50 μm×200 μm in size and consists mainly of SiO2 and TiO2. The average mineral formula is (Ti0.82Si0.18)O2. Powder X-ray diffraction data show that it is tetragonal in form, and the unit cell dimensions and other parameters are: a=4.591(2)?, c=2.946(2)?, v=62.09(5)?3, c/a=0.6415, with a molar volume about 5% smaller than rutile (JCPDS, 21-1276). The Si4+ ions in silicon rutile are six-coordinated, and are substituted for Ti4+ in the rutile structural sites. The Si-rutile, along with other associated ultra-high minerals discovered in the chromitite, such as octahedral silicate, silicon-magnesium spinel (Si4+ ions are six-coordinated), diamond, and intergrown of SiO2 and FeO phases, probably originated from the transition zone or the lower mantle, and were brought to shallow levels beneath an oceanic spreading ridge by an upwelling superplume. 相似文献
80.
Discovery of super-silicic and super-titanic garnets in garnet-pyroxenite in Zhaheba and its geological significance 总被引:1,自引:1,他引:0
Super-silicic garnet which exists stably at more than 5 GPa is a typical ultra-high pressure mineral. The super-silicic garnet and super-titanic garnet were discovered for the first time in garnet-pyroxenlte of early Paleozoic Zhaheba-Aermantai orogenic belt in north Xinjiang. Our study indicates that these su per-silicic garnets as well as super-Utanic garnets were formed at a depth of at least 300 km. Their host rock-garnet-pyroxenite is one kind of ultra-pressure metamorphic rocks which is related to the ultra-deep subduction of the oceanic crust. Thus, the early Paleozoic Zhaheba-Aermantai orogenic belt is related to the ultra-deep aubduction of the Paleo-Aaian oceanic crust. 相似文献