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Polycyclic Paleozoic Tectono Metamorphic Evolution Of The Southern Chinese Altai Central Asian Orogenic Belt
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Book Synopsis Polycyclic Paleozoic Tectono-metamorphic Evolution of the Southern Chinese Altai, Central Asian Orogenic Belt by : Arnaud Broussolle
Download or read book Polycyclic Paleozoic Tectono-metamorphic Evolution of the Southern Chinese Altai, Central Asian Orogenic Belt written by Arnaud Broussolle and published by . This book was released on 2018 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geochemistry and Geochronology of Paleozoic Sedimentary and Plutonic Rocks in the Eastern Tianshan by : Xiaoran Zhang
Download or read book Geochemistry and Geochronology of Paleozoic Sedimentary and Plutonic Rocks in the Eastern Tianshan written by Xiaoran Zhang and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Geochemistry and Geochronology of Paleozoic Sedimentary and Plutonic Rocks in the Eastern Tianshan: Implications for the Evolution of the Southern Central Asian Orogenic Belt" by Xiaoran, Zhang, 张晓冉, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: The Eastern Tianshan Belt (ETB) represents an important component of the southern Central Asian Orogenic Belt (CAOB) between Eastern Europe-Siberia and Tarim-North China, and thus its evolution is of vital importance in understanding the evolution of the southern CAOB. Although extensive investigations were carried out on the ETB in the last decade, controversies still surround the accretionary and collisional processes operative during the development of one microcontinent (Central Tianshan; CTS) and two oceans (Junggar and South Tianshan). This Ph.D. research attempts to resolve the controversial issues by incorporating detrital zircon study with petrological, geochronological and geochemical investigations on Paleozoic sedimentary/magmatic rocks in the ETB. New detrital zircon studies on late Paleozoic (meta-)sedimentary rocks from the North (NTS) and South Tianshan (STS) indicate that the CTS was once part of the northern Tarim during Precambrian time because of their indistinguishable detrital zircon age profiles and Hf isotope compositions. Particularly, Ordovician-Silurian (475-440 Ma) detrital zircons with low negative εHf(t) values predominatein Paleozoic sediments in and surrounding the CTS (including northern Tarim), suggesting that coeval magmatic rocks constituted the main body of the CTS at that time. In combination with previous studies, the CTS most probably developed as a continental arc along the northern Tarim, facing the subduction of the Junggar oceanic plate in the early Paleozoic, with its crust progressively thickened in a compressional environment during subduction zone advance, which gave rise to the generation of thickened lower curst-derived adakitic rocks in the CTS at 450 Ma. Through applying zircon Hf isotope mapping of Paleozoic (500-380 Ma) magmatism from different tectonic units of the ETB, the incipient opening of the STS back-arc basin along the northern Tarim is restricted to have occurred in the Late Ordovician, which is consistent with the discovery of 450 Ma adakitic rocks in the CTS and is further substantiated by the fact that well-defined ophiolitic rocks in the STS are mostly younger than 445 Ma. The opening of the STS back-arc basin, accompanied with the separation of the CTS as a microcontinent, was probably triggered by the concurrent rollback of the Junggar oceanic plate, resulting in a regional tectonic switching from subduction zone advance (before 450 Ma) to retreat (since 450-440 Ma), as supported by the immediate change in detrital zircon εHf(t) values from dominantly negative to positive, the exhumation of high-pressure mafic granulites at the northern margin of the CTS at 430 Ma and the emergence of a series of Devonian-Carboniferous island arcs in the Junggar Ocean. The closure of the eastern segment of the STS Ocean between CTS and Beishan most likely took place in the Late Devonian, as evidenced by the occurrence of 380 Ma regional metamorphism in the southern CTS, whereas the Junggar Ocean was most probably closed in the latest Carboniferous, as evidenced by recognition of 300 Ma regional metamorphism in the northern CTS, consistent with 325-310 Ma mafic-felsic magmatism showing subduction-related signatures and 290 Ma mafic plutons exhibiting within-plate basalt affinities. Subjects:
Book Synopsis Polycyclic evolution of the Eastern Central-Asia orogenic belt by : Guanzhong Shi
Download or read book Polycyclic evolution of the Eastern Central-Asia orogenic belt written by Guanzhong Shi and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is hotly debated about the final closural time and position of the Paleo-Asian Ocean. Some geologists advocated the “Solonker” suture marks the final closural zone in Permian, whereas others insist in middle Paleozoic. Our three study areas, the Hongqi, the Ondor Sum and the Mandula is essential and important to solve those controversies. The litho-tectonic units recognized in the Hongqi-Ondor Sum area include the Hongqi-Ondor Sum mélange belt, the Bainaimiao arc belt, North China Craton and post-orogenic unconformably sedimentary rocks. The Hongqi-Ondor Sum mélange belt experienced two phase ductile deformation and one phase ductile-brittle deformation. D1 is responsible for the regional greenschist foliation S1, elongated mineral lineation L1, and intrafolial fold F1. The kinematic criteria indicates a top-to-the-NW shearing sense. D2 is characterized by various sized of unsymmetrical folds with nearly NE axis corresponding to the NW thrust shearing. D3 formed the regional framework in the Hongqi and the Ondor Sum areas. The Mandula area contains olistostrome sediments, turbiditic sediments and volcano-sedimentary rocks. Detrital zircon grains in sedimentary samples argue the Mandula study area received the southern Bainaimiao arc materials and coeval Permian volcanic erupting materials nearby. The sediments and volcanic rocks in Mandula area subject a nearly NW-SE or N-S compressional shortening. The geological data support that an Early Paleozoic subduction and collsioan, Late Palezoic rifting and rift closure model. The so called “Solonker” ophiolitic fragments indeed are olistostrome. Typical ophiolite components are not observed in the Mandula area.
Book Synopsis Aspects of the Tectonic Evolution of China by : J. Malpas
Download or read book Aspects of the Tectonic Evolution of China written by J. Malpas and published by Geological Society of London. This book was released on 2004 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides accounts of up-to-date research by Chinese and international geological teams on key aspects of the tectonic evolution of China and its surrounding areas. The papers describe the formation of the geological terranes that make up this part of east Asia, place constraints on plate tectonic models for their assembly and provide accounts of unique geological feature of the subcontinent.
Book Synopsis GEOCHEMISTRY & GEOCHRONOLOGY O by : Xiaoran Zhang
Download or read book GEOCHEMISTRY & GEOCHRONOLOGY O written by Xiaoran Zhang and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Geochemistry and Geochronology of Paleozoic Sedimentary and Plutonic Rocks in the Eastern Tianshan: Implications for the Evolution of the Southern Central Asian Orogenic Belt" by Xiaoran, Zhang, 张晓冉, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: The Eastern Tianshan Belt (ETB) represents an important component of the southern Central Asian Orogenic Belt (CAOB) between Eastern Europe-Siberia and Tarim-North China, and thus its evolution is of vital importance in understanding the evolution of the southern CAOB. Although extensive investigations were carried out on the ETB in the last decade, controversies still surround the accretionary and collisional processes operative during the development of one microcontinent (Central Tianshan; CTS) and two oceans (Junggar and South Tianshan). This Ph.D. research attempts to resolve the controversial issues by incorporating detrital zircon study with petrological, geochronological and geochemical investigations on Paleozoic sedimentary/magmatic rocks in the ETB. New detrital zircon studies on late Paleozoic (meta-)sedimentary rocks from the North (NTS) and South Tianshan (STS) indicate that the CTS was once part of the northern Tarim during Precambrian time because of their indistinguishable detrital zircon age profiles and Hf isotope compositions. Particularly, Ordovician-Silurian (475-440 Ma) detrital zircons with low negative εHf(t) values predominatein Paleozoic sediments in and surrounding the CTS (including northern Tarim), suggesting that coeval magmatic rocks constituted the main body of the CTS at that time. In combination with previous studies, the CTS most probably developed as a continental arc along the northern Tarim, facing the subduction of the Junggar oceanic plate in the early Paleozoic, with its crust progressively thickened in a compressional environment during subduction zone advance, which gave rise to the generation of thickened lower curst-derived adakitic rocks in the CTS at 450 Ma. Through applying zircon Hf isotope mapping of Paleozoic (500-380 Ma) magmatism from different tectonic units of the ETB, the incipient opening of the STS back-arc basin along the northern Tarim is restricted to have occurred in the Late Ordovician, which is consistent with the discovery of 450 Ma adakitic rocks in the CTS and is further substantiated by the fact that well-defined ophiolitic rocks in the STS are mostly younger than 445 Ma. The opening of the STS back-arc basin, accompanied with the separation of the CTS as a microcontinent, was probably triggered by the concurrent rollback of the Junggar oceanic plate, resulting in a regional tectonic switching from subduction zone advance (before 450 Ma) to retreat (since 450-440 Ma), as supported by the immediate change in detrital zircon εHf(t) values from dominantly negative to positive, the exhumation of high-pressure mafic granulites at the northern margin of the CTS at 430 Ma and the emergence of a series of Devonian-Carboniferous island arcs in the Junggar Ocean. The closure of the eastern segment of the STS Ocean between CTS and Beishan most likely took place in the Late Devonian, as evidenced by the occurrence of 380 Ma regional metamorphism in the southern CTS, whereas the Junggar Ocean was most probably closed in the latest Carboniferous, as evidenced by recognition of 300 Ma regional metamorphism in the northern CTS, consistent with 325-310 Ma mafic-felsic magmatism showing subduction-related signatures and 290 Ma mafic plutons exhibiting within-plate basalt affinities. Subjects:
Book Synopsis Paleozoic and Mesozoic tectonic evolution of central and eastern Asia by : Gregory Arlen Davis
Download or read book Paleozoic and Mesozoic tectonic evolution of central and eastern Asia written by Gregory Arlen Davis and published by Geological Society of America. This book was released on 2001 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hendrix (geology, U. of Montana) and Davis (earth sciences, U. of Southern California) present 19 articles detailing ground-based work on the history of assembly and intracontinental deformation of central and eastern Asia. Chapters look at the structural, thermochronologic, and sedimentary records of the history of Paleozoic assembly in Mongolia and central and western China. Further information is presented on Mesozoic deformation in orogenic belts of central and eastern Asia. Asia's sedimentary basins are examined and the intracontinental deformation they record is documented. Many of these contributions, particularly the papers examining Mongolian geology, are the first ground-based articles written in English. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Book Synopsis Precambrian Geology of China by : Mingguo Zhai
Download or read book Precambrian Geology of China written by Mingguo Zhai and published by Springer. This book was released on 2015-08-11 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first contribution to the overview of Precambrian geology of China. It covers Precambrian geology of the North China Craton, the South China Craton and the Tarim Craton, as well as other smaller blocks in the Chinese orogenic belts. It provides systematic concepts of the Chinese paleo-continents and incorporates the most up-to-date achievements. Edited by many of the active researchers working at the forefront of the related fields, it contributes greatly to the international Precambrian geology community and would be of interest to geoscientists working in the research field of geology of China and Precambrian geodynamics.
Book Synopsis Tectono-magmatic Evolution of the Russian Altai, Northwestern Central Asian Orogenic Belt by : 陈明
Download or read book Tectono-magmatic Evolution of the Russian Altai, Northwestern Central Asian Orogenic Belt written by 陈明 and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Paleozoic Accretionary Orogenesis of the Chinese Altai, Central Asian Orogenic Belt by : 崔幸
Download or read book Paleozoic Accretionary Orogenesis of the Chinese Altai, Central Asian Orogenic Belt written by 崔幸 and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Capitoli del Santo Monte della Pieta di Forli. - Additioni et Ampliationi ... et correttioni de Capituli del Monte della Pieta, fatte d'ordine dei Consiglio generale della citta di Forli by :
Download or read book Capitoli del Santo Monte della Pieta di Forli. - Additioni et Ampliationi ... et correttioni de Capituli del Monte della Pieta, fatte d'ordine dei Consiglio generale della citta di Forli written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tectonics of Asia (Northern, Central and Eastern Asia) by : Oleg V. Petrov
Download or read book Tectonics of Asia (Northern, Central and Eastern Asia) written by Oleg V. Petrov and published by Springer. This book was released on 2022-03-05 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides the results of tectonic, geological and geophysical studies of Northern, Central and Eastern Asia obtained over the last 20 years, and a Tectonic map for this area overview as well as essays on its geodynamic evolution. These new results were obtained by an international team of specialists within the project “Atlas of geological maps of Central Asia and adjacent areas,” scale 1: 2,500,000, initiated in 2003 by geological surveys of Russia, China, Mongolia, Kazakhstan and South Korea under the auspices of the CGMW. The most of the book contains the descriptions of the tectonic structure of major geological regions of Asia, such as the Ural, Sayan-Baikal and Tien Shan orogenic systems. The tectonic structure of the Pamirs, Turan Plate, Mongolia, Southern China, Korea and other regions is also discussed. The book contains maps of gravity and magnetic anomalies, sketch maps of deep structures of the area, and the geotransect crossing the most important geological structures of Asia. The final chapter of the book describes the tectonic evolution of the Central Asian Orogenic Belt from the Neoproterozoic to the Mesozoic.
Book Synopsis Neoproterozoic to Middle Palaeozoic Evolution of the Central Asian Orogenic Belt in South-central Mongolia: Chronological and Geochemical Perspectives by :
Download or read book Neoproterozoic to Middle Palaeozoic Evolution of the Central Asian Orogenic Belt in South-central Mongolia: Chronological and Geochemical Perspectives written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mongolia occupies a central position within the eastern branch of the large accretionary Central Asian Orogenic Belt (CAOB) or Altaids. The present work aims to outline the geodynamic environment and possible evolution of this part of the eastern CAOB, predominantly from the Cambrian to the middle Palaeozoic. The investigation primarily focussed on zircon geochronology as well as whole-rock geochemical and Sm- d isotopic analyses for a variety of metaigneous rocks from the southern Hangay and Gobi-Altai regions in south-central Mongolia. The southern slope of the Hangay Mountains in central Mongolia exposes a large NW-SE-trending middle Neoproterozoic ophiolitic complex (c. 650 Ma), which is tectonically integrated within an accretionary complex developed between the Precambrian Baydrag and Hangay crustal blocks. Formation of the entire accretionary system along the north-eastern margin of the Baydrag block mainly occurred during the early Cambrian, but convergence within this orogenic zone continued until the early Ordovician, because of on-going southward subduction-accretion of the Baydrag block. An important discovery is the identification of a late Mesoproterozoic to early Neoproterozoic belt within the northern Gobi-Altai that was reworked during the late Cambrian and throughout the late Ordovician/Devonian. Early Silurian low-grade mafic and felsic metavolcanic rocks from the northern Gobi-Altai display subduction-related geochemical features and highly heterogeneous Nd isotopic compositions, which suggest an origin at a mature active continental margin. Early Devonian protoliths of granodioritic and mafic gneisses from the southern Gobi-Altai display geochemical and Nd isotopic compositions compatible with derivation and evolution from predominantly juvenile crustal and mantel sources and these rocks may have been emplaced within the outboard portion of the late Ordovician/early Silurian active continental margin. Moreover, middle Devonian low-grade metavolc.
Book Synopsis AGES GEOCHEMISTRY & TECTONIC S by : Wenzhu Hou
Download or read book AGES GEOCHEMISTRY & TECTONIC S written by Wenzhu Hou and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Ages, Geochemistry and Tectonic Settings of the Paleozoic-Mesozoic Rocks Along the Hegenshan-Heihe Suture Zone in the Eastern Segment of the Central Asian Orogenic Belt" by Wenzhu, Hou, 侯文竹, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: The Hegenshan-Heihe belt (HHB) represents a suture zone resulting from the collision of the Xing'an and Songliao blocks located in the eastern segment of the Central Asian Orogenic Belt (CAOB). The formation of the HHB marks the destruction of the oceanic lithosphere and the closure of the Paleo-Asian Ocean (PAO). It has been a long-time debate regarding the tectonic evolution of the Xing'an and Songliao blocks and the intervening ocean during Paleozoic time, particularly the final closure timing of the PAO along the HHB. This project is aimed to address these issues by integrating the geochronology and geochemistry of the Paleozoic volcanic rocks and their tectonic setting with the detrital zircon data. The geochronological and geochemical data for two suites of the Paleozoic volcanic and sedimentary rocks suggest two long-lived island-arc systems along the southern margin of the Xing'an block and the northern margin of the Songliao Block. LA-ICP-MS zircon U-Pb dating results indicate that the Ordovician volcanic rocks developing at the southern margin of the Xing'an block erupted at ca. 447Ma and geochemically resemble the arc-related volcanism with strongly enriched LREE and LILE. The zircon ages also revealed the basement information of the Xing'an block by yielding age populations similar to 2.5, 1.8, 1.2, and 0.8 Ga from the inherited zircons, most likely shed from the deep continental crust during the magma migration and contamination. Similar features were also discovered in the locally deposited Silurian-Devonian sedimentary strata. This study suggests an Andean-type continental margin developing at the southern margin of the Xing'an block, associated with the northward subduction of the PAO from Ordovician to Devonian (ca.465-392Ma). The Carboniferous volcanic rocks developed at the northern margin of the Songliao block, associated with the coevally deposited sedimentary strata, showing a close affinity with oceanic island-arc, and the sedimentary strata formed in a back-arc/forearc basin. This study also suggests a Western Pacific-type subduction and arc-basin system developing at the northern margin of the Songliao block during Ordovician to Carboniferous time (ca. 452-315 Ma). The detrital zircon analysis suggests that a provenance transfer for the sedimentary strata developing in the HHB took place between the Late Carboniferous and Permian, with the Carboniferous strata sourcing Paleozoic detritus from the isolated island-arcs and the Permian strata sourcing Precambrian detritus from the approximate continent. Integrated with the previously reported data, this study suggests that the final closure of the PAO along the HHB occurred at some time between 303-312 Ma. This study also reports a suite of Mesozoic bimodal volcanic rocks in Zhalantun area, which was previously thought to be Permian in age, namely the Dashizhai formation. This suite of volcanic rocks formed in a regional extensional environment, which was mostly likely induced by the post-collisional extension of the eastern CAOB. On the basis of new data presented in this thesis combined with previous studies, I present a new tectonic model for the Paleozoic subduction and collision followed by a Mesozoic extension for the Hegenshan-Heihe suture zone. Subjects: Suture zones (Structural geology)
Book Synopsis The Paleozoic Tectono-metamorphic Evolution of the Charters Towers Province, North Queensland, Australia by : Raphael Quentin de Gromard
Download or read book The Paleozoic Tectono-metamorphic Evolution of the Charters Towers Province, North Queensland, Australia written by Raphael Quentin de Gromard and published by . This book was released on 2011 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Paleozoic Tectonic Evolution of the Chinese Altai Orogen by : Po-Wan Kenny Wong
Download or read book Paleozoic Tectonic Evolution of the Chinese Altai Orogen written by Po-Wan Kenny Wong and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Paleozoic Tectonic Evolution of the Chinese Altai Orogen: Contraints From Geochemical and Geochronologic Studies of Mafic Rocks" by Po-wan, Kenny, Wong, 王步雲, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b4492087 Subjects: Orogenic belts - Altai Mountains Geology, Structural - Altai Mountains Geology, Stratigraphic - Paleozoic Geochemistry - Altai Mountains Geochronometry - Altai Mountains
Book Synopsis Trancing Provenances of Detrital Zircons in the South Tianshan and Northern Tarim Craton by : 韓以貴
Download or read book Trancing Provenances of Detrital Zircons in the South Tianshan and Northern Tarim Craton written by 韓以貴 and published by . This book was released on 2016 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tectonic Evolution of the Middle Segment of the Southern Central Asian Orogenic Belt by : 劉潜
Download or read book Tectonic Evolution of the Middle Segment of the Southern Central Asian Orogenic Belt written by 劉潜 and published by . This book was released on 2017 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt:
