Journal of The Virtual Explorer最新文献_第3页

Multiscale structural analysis in the subducted continental crust of the internal Sesia-Lanzo Zone (Monte Mucrone, Western Alps) 西阿尔卑斯山脉内塞西亚-兰佐带俯冲大陆地壳多尺度结构分析

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/JVIRTEX.2011.00287

F. Delleani, M. Spalla, D. Castelli, G. Gosso

引用次数: 11

A geological cross-section through northern Greece from Pindos to Rhodope Mountain Ranges: a field guide across the External and Internal Hellenides 希腊北部从平多斯到罗多彼山脉的地质横截面:穿越外部和内部希腊的野外指南

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/JVIRTEX.2016.08685

A. Kilias, A. Vamvaka, C. Fassoulas, G. Falalakis, Stylianos Avgerinas, A. Sfeikos, K. Pipera, Emmanouil Katrivanos, E. Thomaidou

引用次数: 8

The Geology of Ikaria Island:The Messaria extensional shear zone, granites and the exotic Ikaria nappe 伊卡利亚岛地质:梅萨里亚伸展剪切带、花岗岩和外来的伊卡利亚推覆体

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/JVIRTEX.2007.00171

U. Ring

引用次数: 14

Impact Of Gravity And Other Geophysical Data On The Geology Of The Indian Subcontinent 重力和其他地球物理数据对印度次大陆地质的影响

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/JVIRTEX.2003.00072

T. Balakrishnan

引用次数: 0

Rhodope: From Mesozoic convergence to Cenozoic extension 从中生代辐合到新生代伸展

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/jvirtex.2011.00270

J. Burg

{"title":"Rhodope: From Mesozoic convergence to Cenozoic extension","authors":"J. Burg","doi":"10.3809/jvirtex.2011.00270","DOIUrl":"https://doi.org/10.3809/jvirtex.2011.00270","url":null,"abstract":"Mylonitic gneisses of the Bulgarian and Greek Rhodope were deformed under amphibolite-facies conditions of medium pressure type metamorphism. The kinematic information contained on the strain regime and histories of these gneisses shows that ductile, shear-deformation occurred during development of a nappe complex. The nappe complex is characterised by south to southwestward (forelandward) piling-up and both coeval and subsequent extension. Different lithologies, deformation and metamorphic histories discriminate lower (footwall) and upper (hangingwall) continental terranes that define a crustal-scale duplex. Ultrahigh-Pressure metamorphic rocks, eclogites, ophiolitic and magmatic arc protoliths are found in various units of the crustal-scale duplex structure. These rocks delineate a suture zone between the hanging wall and footwall continental units. Synmetamorphic suturing and thrusting imply crustal thickening during the Cretaceous, which implies that the Rhodope massif is a complex of synmetamorphic nappes stacked in a Tethyan active margin environment. The two blocks involved in the collision are the Moesian part of the European continent to the north, and the Lower-Rhodope Terrane to the south, which was a migrating block detached from Pangea during breakup times of this supercontinent. Regional inversions of synmetamorphic sense-of-shear indicate that exhumation tectonics began in Cretaceous times, possibly linked to upward-forward expulsion of low density arc and continental rocks. A Late Eocene marine transgression separates the early, late-orogenic extension/exhumation phase from another extension event accompanied by a major thermal and magmatic event and followed by the Miocene Aegean extension responsible for late grabens over the Rhodope Massif.","PeriodicalId":201383,"journal":{"name":"Journal of The Virtual Explorer","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122312506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 135

Petrography and Petrogenesis of Pre-Mesozoic rocks, Ago-Iwoye NE, SW Nigeria 尼日利亚西南部东北部Ago-Iwoye前中生代岩石学与岩石成因

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/JVIRTEX.2012.00313

K. Omosanya, R. A. Sanni, T. Laniyan, G. O. Mosuro, H. O. Omosanya, L. Falana

{"title":"Petrography and Petrogenesis of Pre-Mesozoic rocks, Ago-Iwoye NE, SW Nigeria","authors":"K. Omosanya, R. A. Sanni, T. Laniyan, G. O. Mosuro, H. O. Omosanya, L. Falana","doi":"10.3809/JVIRTEX.2012.00313","DOIUrl":"https://doi.org/10.3809/JVIRTEX.2012.00313","url":null,"abstract":"Detailed geological mapping was carried out in a part of Ago-Iwoye NE with a view to identify the rock types and determine their origin. Petrographic and whole rock analysis of seven rock samples collected during the initial mapping exercise was done through thin sectioning, and X-ray fluorescence. Minerals were studied in cross and plane polarized light; their contact angle and boundary interaction were inferred in thin section. Normative mineralogy of the rocks was also determined using CIPW Norm. The study area is underlain by both igneous and metamorphic rocks; the gneisses are migmatized and intruded by granitic rocks and pegmatite. The dominant minerals in thin section include quartz, biotite, muscovite and hornblende. Estimated mineral contact angle is ~56° and ~26° for hornblende-biotite and hornblende-muscovite, respectively. Mineral grain boundaries are planar and undulating in thin section. The geochemical study revealed major oxides such as SiO2, Al2O3, Fe2O3, CaO, MgO, K2O and Na2O. The highest estimated liquid temperature occurred in the gneisses with a value of ~1014°C, mean of ~862°C, range of ~281°C and water content of 1.6% which shows that the rocks are metamorphic in origin. The volume composition shows that quartz has the highest volume in all the seven samples with a percentage value of ~68%. Discriminant plots show that the granites are quartz-rich granitoid and granodiorite while the gneisses have high liquidus temperature; all the rocks samples record high alteration indices and are derived from passive and continental margins. Rocks of the study area are Pan African granitoids emplaced into the polycyclic Pre-Cambrian migmatized complex host rock. Citation: 2012. Petrography and Petrogenesis of Pre-Mesozoic rocks, Ago-Iwoye NE, SW Nigeria. In: (Ed.) Gordon S. Lister, Journal of the Virtual Explorer, volume 40, paper 1, doi: 10.3809/jvirtex.2012.00313 Journal of the Virtual Explorer, 2012 Volume 40 Paper 1 http://virtualexplorer.com.au/","PeriodicalId":201383,"journal":{"name":"Journal of The Virtual Explorer","volume":"404 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122861683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Field Trip 2 - General Architecture and tectonic evolution of Alpine Corsica. Insights from a transect between Bastia and the Balagne region. 实地考察2 -科西嘉高山的一般建筑和构造演化。从巴斯蒂亚和巴拉格尼地区之间的样带观察。

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/JVIRTEX.2011.00301

J. Malavieille, G. Molli, M. Ferrandini, J. Ferrandini, M. M. Spella, A. V. Brovarone, O. Beyssac, Laurent Ciancaleoni, M. Maggi, F. Rossetti

引用次数: 4

The Evolution of the Lithospheric Mantle during Mesozoic Rifting in the Ligure-Piedmontese Domain 利古-皮埃蒙特地区中生代裂陷期岩石圈地幔演化

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/JVIRTEX.2010.00219

G. B. Piccardo

引用次数: 13

Destruction of the North China Craton: evidence from the Bohai Bay Basin 华北克拉通的破坏:来自渤海湾盆地的证据

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/JVIRTEX.2009.00243

Guiting Hou, Mohan Yang, Weihou Yao

引用次数: 5

Past and present mid-intensity explosive eruptions of Italian volcanoes and their impact on human activity 意大利火山过去和现在的中等强度爆发及其对人类活动的影响

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI: 10.3809/JVIRTEX.2009.00229

R. Cioni, A. Bertagnini, C. D’Oriano, M. Pompilio

引用次数: 3