|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 滇西哀牢山深变质杂岩新生代多期变质、剪切变形及地质意义显示文摘造山带内大型走滑断层带的运动、变形及变质事件的精细厘定,对研究造山带演化具有重要意义。沿着红河-哀牢山走滑断裂带出露大量深变质杂岩体,这些深变质杂岩保存了极其丰富的变形-变质以及热-构造演化信息。本文重点以红河-哀牢山走滑断层带中的变基性岩和变泥质岩为研究对象,开展了详细的宏观和显微构造、岩相矿物组合、变形温压条件及年代学的综合分析。所有的结果表明哀牢山深变质杂岩经历了至少三个阶段的变质以及依次的变形,即早期进变质阶段(M1)、峰期麻粒岩相变质阶段(M2)(T=780~840℃,P=~0. 95GPa)以及峰后近等温减压阶段(M3),具有明显的顺时针PT演化轨迹。获得片麻岩中的锆石边的变质或熔融年龄为35. 2±0. 9Ma^33. 9±0. 8Ma。同时结合EBSD变形矿物晶格优选定向分析,可以确定峰后近等温减压阶段(M3)与区域左行剪切变形阶段相一致。 | 王浩博 曹淑云 李俊瑜 程雪梅 吕美霞 Bernroider MANFRED Franz NEUBAUER | 2019 | 岩石学报2019，35，8： | 9 |
| 2 | Geochemistry of Enclaves and Host Granitoids from the Kashan Granitoid Complex, Central Iran: Implications for Enclave Generation by Interaction of Cogenetic Magmas显示文摘专业和踪迹元素和中新世的主人 granitoid 岩石和他们的 mafic microgranular 被外国领地包围的土地(MME ) 的 Sr-Nd-Pb 同位素被学习在 Kashan 建筑群理解 MME 的 petrogenesis,它是 Urumieh-Dokhtar magmatic 带(伊朗) 的部分。主人岩石由与 dioritic 侵入联系的石英闪长岩和 tonalite 组成。象他们有斜长石,石英和黑云母的各自的主人的被外国领地包围的土地表演 microgranular 质地和一样的矿物学。MME 有闪长岩到主要在他们的 granitoid 主人和闪长岩侵入之间的石英闪长岩作文和表演 geochemical 特征。所有样品的使球粒状陨石正常化的 REE 模式是中等 fractionated [(La/Yb ) N =2.1 到 12.9 ] 。MME 显示部分地小的否定 Eu 异例(Eu/Eu *=0.54 到 0.99 ) ,与 LILE 的丰富和 HFSE 的弄空。被外国领地包围的土地显示出与主人可比较的 4 ~ 6 km 摇的 ~ 的炮兵阵地深度。而且, MME 的角闪石斜长石平衡 temprature 产出 795 的平均温度?????????猠瑩?唠倭????晈??????????????????????祫湡瑩?攠汣杯瑩????????吗?唠倭??六?猠牥数瑮湩穩摥?慨穲畢杲瑩?????传???????魐? 魐 ?? | Maryam Honarmand Nematollah Rashidnejad Omran Franz Neubauer Ghasem Nabatian Mohammad Hashem Emami Albrecht von Quadt Yunpeng Dong Manfred Bernroider | 2015 | Journal of Earth Science2015，26，5： | 2 |
| 3 | Polyhalite microfabrics in an Alpine evaporite mélange: Hallstatt, Eastern Alps显示文摘 | Anja Schorn Franz Neubauer Manfred Bernroider | 2013 | Journal of Structural Geology2013，，： | 1 |
| 4 | Metamorphic stages in mountain belts during a Wilson cycle:A case study in the central Sanandaj-Sirjan zone(Zagros Mountains,Iran)显示文摘Polymetamorphic units are important constituents of continent-continent collisional orogens,and rift metamorphic assemblages are often overprinted by subsequent metamorphism during subduction and collision.This study reports the metamorphic conditions and evolution of the Dorud-Azna metamorphic units in the central part of the Sanandaj-Sirjan zone(SSZ),Iran.Here,new geothermobarometry results are integrated with ^(40)Ar/^(39)Ar mineral and Th-U-Pb monazite and thorite ages to provide new insight of polyphase metamorphism in the two different basement units of the SSZ,the lower Galeh-Doz orthogneiss and higher Amphibolite-Metagabbro units.In the Amphibolite-Metagabbro unit,staurolite micaschist underwent a prograde P-T evolution from 640±20℃/6.2±0.8 kbar in garnet cores(M1)to 680±20℃/7.2±1.0 kbar in garnet rims(M2).Three Th-U-Pb monazite ages of 306±5 Ma,322±28 Ma and 336±39 Ma from the garnet-micaschists testify the Carboniferous age of M1 metamorphism.In the same unit,the metagabbro records P-T conditions of 4.0±0.8 kbar and 580±50℃ in the(magmatic)amphibole core(Late Carboniferous intrusion)to 7.5±0.7 kbar and 700±20℃ in the amphibole rim indicating a prograde P-T path during subsequent burial(M1).New ^(40)Ar/^(39)Ar dating of white mica from the staurolite micaschist yielded a staircase pattern ranging from 36±12 Ma to 170±2 Ma.This implies polymetamorphism with a minimum Late Jurassic cooling age through the Ar retention temperature of ca.425±25℃ after M2 metamorphism and a Paleogene low-grade metamorphic overprint(M3),while ^(40)Ar/^(39)Ar white mica dating of garnet micaschist yielded a plateau age of 137.84±0.65 Ma.We therefore interpret the amphibolite-grade metamorphism M2 to have predated 170 Ma and is likely between 180 and 200 Ma.Furthermore,it is overprinted at about 36 Ma under retrogressive low-grade M3 metamorphism(at temperatures of~350-240℃)during final shortening and exhumation.In the underlying Galeh-Doz unit,the Panafrican granitic orthogneiss intruded at P-T conditions of 3.2±4 kbar and 700±20℃,then it was metamorphosed and deformed at 600±50℃ and 2.0±0.8 kbar(metamorphic stage M1)prior to Late Carboniferous intrusion of mafic dikes.^(40)Ar/^(39)Ar dating of amphibole from the Galeh-Doz orthogneiss gave plateau-like steps between 260 and 270 Ma,representing the age of cooling through ca.500℃ after the M1 metamorphic event.Interestingly,the results of this study demonstrate polyphase metamorphic histories in both the Galeh-Doz orthogneiss and Amphibolite-Metagabbro units at different P-T conditions and final thickskinned Paleogene emplacement of these units over the underlying low-grade metamorphic June Complex.Our findings suggest that both units are affected by high-T/low-P Late Carboniferous orogenic metamorphism along with the bimodal magmatism,as result of rifting.We propose that the Early Jurassic amphibolite-grade M2 metamorphism of the SSZ is correlated with the initial subduction of the Neotethyan Ocean.Eventually,the investigated units reflect various stages of a Wilson cycle,from rifting to initiation of the subduction in final plate collision. | Farzaneh Shakerardakani Franz Neubauer Manfred Bernroider Fritz Finger Christoph Hauzenberger Johann Genser Michael Waitzinger Behzad Monfaredi | 2022 | Geoscience Frontiers2022，13，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员