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Metamorphic Evolution of Chloritoid-Bearing Micaschist from the Variscan Elstergebirge: Evidences for Stacking of High-Pressure Rocks in the Saxothuringian Zone of Central Europe

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Journal of Earth Science 2020年第3期31卷 425-446页

作者： Gelareh Rahimi hans-joachim massonne Fakultat Chemie Universitat Stuttgart70569 StuttgartGermany School of Earth Sciences China University of GeosciencesWuhan 430074China

A chloritoid-garnet-bearing micaschist from the southern part of the Elstergebirge was studied to better understand the Variscan orogenic evolution in the Saxothuringian zone of the northwestern Bohemian *** on the textural relations and compositions of minerals,especially of zoned garnet and potassic white mica,a P-T path was reconstructed using contoured P-T *** U-Th-Pb dating of monazite in the micaschist was undertaken with the electron *** micaschist experienced P-T conditions along a clockwise path between 16 kbar at 510℃and 5 kbar at 555℃followed by isobaric heating to about 600℃.Monazite ages range between 315 and 480 Ma with the most prominent maxima and side maxima at 346.0±1.1(2σ),357.3±2.3,and 368.3±1.7 *** older than 380 Ma were related to detrital monazite pointing to a Devonian sedimentary *** ages around 325 Ma were assigned to the isobaric heating by nearby post-tectonic *** high-pressure event,being the result of the collision of Laurussia and Gondwana after closure of the Rheic Ocean,occurred in the Late *** exhumation to 15-20 km(5 kbar)ended probably in the Early *** high-pressure micaschists from the Fichtelgebirge to the Erzgebirge crystalline complexes are suggested to represent a single nappe within a metamorphic nappe *** nappe is composed of metasedimentary slices,which experienced different peak pressures rather than representing a coherent crustal section.

关键词： Saxothuringian micaschist chloritoid garnet monazite dating Variscan P-T path

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Pressure-Temperature Evolution of a Mylonitic Gneiss from the Lower Seve Nappe in the Handol Area,Central Sweden

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Journal of Earth Science 2021年第6期32卷 1496-1511页

作者： Botao Li hans-joachim massonne Xiaoping Yuan School of Earth Sciences China University of GeosciencesWuhan430074China Fakultät Chemie Universität Stuttgart70569StuttgartGermany

Ultrahigh-pressure metamorphism has recently been reported from various crustal rocks in the Seve Nappe Complex(SNC)in which microdiamonds were ***,in gneiss from the Lower Seve Nappe(LSN),neither any direct petrographic indication for UHP was reported nor the metamorphic evolution was well *** studied a mylonitic gneiss from the Handol area of the LSN and applied phase-diagram modeling and Ti-in-biotite *** on the compositions of garnet and biotite and observed mineral assemblages,a path was reconstructed passing through about 8 kbar and 730℃at prograde ***-pressure and initial retrograde stages occurred at 9.0–10.2 kbar at 745-775℃,and 7–9 kbar at<750℃,*** ultrahigh-pressure evidence was recognized compatible with medium-pressure metamorphism deduced in earlier studies of gneiss from the *** higher peak pressures were reported recently for metamorphic rocks of the LSN,a possible interpretation is that slices or erased blocks were subducted,metamorphosed at different depths,and exhumed in a subduction ***,the dominant gneiss of the SNC experienced only a medium-pressure metamorphism in the upper part of the downgoing Baltica *** from different depth levels were brought together in an exhumation channel located between Baltica and the overlying plate.

关键词： Lower Seve Nappe Swedish Caledonides mylonitic gneiss P-T pseudosection modeling Ti-in-biotite thermometry metamorphic rocks

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Exhumation of an UHP eclogite from WGR: HP Granulite-Facies Re-equilibration, Zo-Bt-Dehydration Melting, and Formation of Oriented Q-Amp-Phn in Cpx

Exhumation of an UHP eclogite from WGR: HP Granulite-Facies ...

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2020年中国地球科学联合学术年会

作者： Penglei Liu hans-joachim massonne School of Earth Sciences China University of Geosciences

An eclogite from the island of Fj?rtoft, Western Gneiss Region (WGR) in Norway, has experienced a complex metamorphic evolution. On the basis of petrographic observations, mineral chemistry, thermodynamic modelling of... 详细信息

关键词： and Formation of Oriented Q-Amp-Phn in Cpx Exhumation of an UHP eclogite from WGR HP Granulite-Facies Re-equilibration Zo-Bt-Dehydration Melting UHP

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大别山甘家岭超高压大理岩和榴辉岩在折返早期经历的两期隐性的榴辉岩相流体-岩石相互作用

大别山甘家岭超高压大理岩和榴辉岩在折返早期经历的两期隐性的榴...

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2020年中国地球科学联合学术年会

作者：刘鹏雷 hans-joachim massonne 章军锋金振民中国地质大学(武汉)地球科学学院

研究高压-超高压变质岩所记录的流体-岩石相互作用能够为俯冲带深部的流体性质和行为提供重要约束。本研究对大别山超高压变质带中甘家岭地区的透辉石大理岩和其中包裹的榴辉岩进行了详细的岩相学观察、矿物主微量元素化学分析和相平衡... 详细信息

研究高压-超高压变质岩所记录的流体-岩石相互作用能够为俯冲带深部的流体性质和行为提供重要约束。本研究对大别山超高压变质带中甘家岭地区的透辉石大理岩和其中包裹的榴辉岩进行了详细的岩相学观察、矿物主微量元素化学分析和相平衡模拟计算。阴极发光、元素面扫和线扫研究结果表明,大理岩中的透辉石发育三个截然接触的成分区域,具体表现为成分均一的核部被其他两个成分区域先后所取代。相较于核部,新生的两个区域更加富Na、Al、Fe、Ti、Sr、Y、REE和过渡族金属元素Sc、V、Co、Ni、Zn,而贫Mg,Ca、K。

关键词：流体-岩石相互作用榴辉岩相大理岩早期经历大别山

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