Download or read book Spot U Pband Hf Isotope Analyses of Detrital Zircons from the Khondalites in the Western Block of the North China Craton written by Xiaoping Xia 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, "Spot U-Pband Hf Isotope Analyses of Detrital Zircons From the Khondalites in the Western Block of the North China Craton" by Xiaoping, Xia, 夏小平, 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: Abstract of thesis entitled SPOT U-Pb AND Hf ISOTOPE ANALYSES OF DETRITAL ZIRCONS FROM THE KHONDALITES IN THE WESTERN BLOCK OF THE NORTH CHINA CRATON Submitted by Xiaoping Xia for the degree of Doctor of Philosophy at The University of Hong Kong in August 2005 A major advancement of Precambrian geology in the North China Craton has been achieved by its tectonic subdivision into the Eastern and Western Blocks separated by the Trans-North China Orogen. However, further understanding the history of this craton is hindered by the lack of data for the Ordos Terrane, which is covered by basin sediments in the southern part of the Western Block. The khondalites in the Western Block are high-grade metasedimentary rocks derived from the Ordos Terrane. Therefore, detrital zircon U-Pb and Hf isotope studies for these khondalites will provide insights into the basement nature of this terrane. The spot U-Pb isotope analytical procedure on zircon is developed in this study by using a frequency-quintupled Nd: YAG 213 nm UV laser ablation system coupled to a VG PQExcel mass spectrometer and successfully applied to the study of the detrital zircons from the khondalites in Jining, Wulashan and Luliang Complexes. Most of the detrital zircons are igneous origin and yield U-Pb ages of 1.9-2.1 Ga, indicating a dominating Paleoproterozoic provenance. The khondalites have a maximum depositional age of 1.84 Ga and were metamorphised 1.81 Ga ago, demonstrating that they were deposited in Paleoproterozoic and soon metamorphosed due to the assembly of the North China Craton.. Hf isotope data for detrital zircons from the Wulashan Complex show that they possess ε values between -8 and +9, suggesting their crystallization from Hf magmas derived from underlying old crust and juvenile materials from the mantle. The lowest ε values with different ages define an evolution line that Hf intersects the depleted mantle line at 2.6 Ga in a ε vs. time diagram. This Hf implies that the sedimentary provenance was underlain by a lower crust separated from the mantle at 2.6 Ga. All the detrital zircons from one sample have 2.0 Ga ages and positive ε from +1 to +9, recording a significant crustal Hf growth event. Hf isotope data for the Luliang Complex support that the sedimentary provenance was mainly underlain by a lower crust extracted from the mantle at 2.6 Ga with significant juvenile crustal addition at 2.1 Ga. The oldest crustal material was identified to have an age of 4.2 Ga, demonstrating the existence of an older component in the deep crust of the Ordos Terrane or alternatively imply that the Luliang khondalites in the Trans-North China Orogen IIcame from a provenance different from that of the Khondalite Belt in the Western Block. Above results suggest that the Ordos Terrane of the Western Block may have early Archean nuclei that underwent a major crustal accretion from the mantle at 2.6 Ga and a significant juvenile crustal growth at 2.0-2.1 Ga. This is in striking contrast with the Eastern Block, which has two crustal growth peaks at 3.6-3.2 Ga and 3.0-2.6 Ga, and 2.8 Ga is the dominant time for crustal formation. These data clearly demonstrate that the Eastern and Western Blocks evolved separately before they collided to form the coherent North China Craton at 1.8 Ga. III DOI: 10.5353/th_b3577369 Subjects: Zircon - China Isotope
Download or read book Spot U Pband Hf Isotope Analyses of Detrital Zircons from the Khondalites in the Western Block of the North China Craton written by Xiaoping Xia and published by . This book was released on 2005 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ages Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province written by Meiling Wu and published by Springer. This book was released on 2014-11-21 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on issues of when and how Archean crust in the craton was formed, this PhD thesis book presents major research outcomes of field based metamorphic, geochemical and geochronological investigations on Meso-Neoarchean basement rocks from Shandong Province in the Eastern Block of the North China Craton. Based on major findings and new data, the author proposes that the formation and evolution of Archean crust was governed by mantle plumes, not by plate tectonics. As one of the oldest cratonic blocks in the world containing rocks as old as 3.85 billion years, the formation and evolution of North China Craton is still controversial. Therefore this book will be of value to anyone interested in the evolution of cratonic blocks and Precambrian geology.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fall Meeting written by American Geophysical Union. Meeting and published by . This book was released on 2005 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U PB Age and Hf Isotopic Study of Detrital Zircons from the Liaohe Group written by Yan Luo and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "U-Pb Age and Hf Isotopic Study of Detrital Zircons From the Liaohe Group: Constraints on the Evolution of the Jiao-Liao-Ji Belt, North China Craton" by Yan, Luo, 羅彥, 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: Abstract of thesis entitled U-Pb AGE AND Hf ISOTOPIC STUDY OF DETRITAL ZIRCONS FROM THE LIAOHE GROUP: CONSTRAINTS ON THE EVOLUTION OF THE JIAO-LIAO- JI BELT, NORTH CHINA CRATON Submitted by Luo Yan for the degree of Doctor of Philosophy at The University of Hong Kong in December 2005 The North China Craton (NCC) is the largest and oldest known continental block in China. The Jiao-Liao-Ji mobile belt along the eastern margin of the NCC is one of the rarely preserved Paleoproterozoic integrities in the world. As an important Paleoproterozoic sedimentary sequence of this belt, the Liaohe Group consists of an assemblage that includes a lower arkose- and volcanic-rich sequence (Langzishan, Li'eryu /Gaojiayu Formations), through a middle carbonate-rich sequence (Dashiqiao Formation) to an upper argillaceous sequence (Gaixian Formation). Traditionally, this group was subdivided into the North and South Liaohe Groups. Associated with the Liaohe Group are large volumes of granitoid rocks (Liaoji Granite), whose emplacement age has been dated at 2.1-2.2 Ga. Regionally, the Liaohe Group and the associated Liaoji Granite extend along a NEE-trending belt that is flanked by 2.45-2.55 Ga basement gneisses. Because of the lack of knowledge about the timing of deposition and metamorphism, nature of the sedimentary provenance and the basement, controversy exists on several issues including the depositional environment and tectonic significance of these rocks. The present work aims to constrain key issues by studying U-Pb, Hf isotopic and trace elemental compositions of detrital zircons from the Liaohe Group. Modern analytical technology such as cathodoluminescence (CL) imaging, laser ablation inductively coupled plasma mass spectrometry and laser ablation multiple collector inductively coupled plasma mass spectrometry were employed. CL images reveal that most detrital zircon grains from the Liaohe Group are characterized by concentric oscillatory zoning, suggesting magmatic origin. However, a small number of zircon grains have structureless recrystallization rims, indicating metamorphic origin. Results of this study show that the zoned zircon grains of the Langzishan Formation, the lowest sequence of the Liaohe Group, have concordant U-Pb ages ranging from 2.24-2.05 Ga, suggesting that the minimum depositional time of the Liaohe Group is at 0.2815 and 0.2813), similar Hf model ages (T, peaks at 2.66 Ga 2.75 DM Ga, and 2.8 3.0 Ga) and similar εHf values ( -5 +9 and -7 +5). Data of this study suggest that the metasedimentary rocks of the Liaohe Group were deposited between 2.05 and 1.93 Ga, a short time after emplacement of the Liaoji Granite. The provenance of the Langzishan, Li'eryu and Gaixian Formations, is particularly dominated by the Liaoji Granite. Furthermore, the protoliths of the North and South groups may have formed simultaneously and could have developed on a single late Archean basement rather than two different blocks. This
Download or read book Andesites written by R. S. Thorpe and published by . This book was released on 1982-04-29 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, expertly authored account of the orogenic andesite association. Focuses on the classification, petrology, and mineralogy of orogenic volcanic rocks. Describes the characteristics and evolution of active orogenic provinces. Examines: the volcanological, chemical, and isotopic characteristics and experimental petrology of andesites and the roles of andesites in continental growth and in the formation of mineral deposits.
Download or read book U Pb Age and Hf Isotopic Study of Detrital Zircons from the Liaohe Group written by Yan Luo (Geologist.) and published by . This book was released on 2005 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Low Grade Metamorphism written by M. Frey and published by John Wiley & Sons. This book was released on 2009-07-15 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-Grade Metamorphism explores processes and transformations in rocks during the early stages of metamorphic recrystallization. There has been little analysis and documentation of this widespread phenomenon, especially of the substantial and exciting advances that have taken place in the subject over the last decade. This book rectifies that shortfall, building on the foundations of Low-Temperature Metamorphism by Martin Frey (1987). The editors have invited contributions from an internationally acknowledged team of experts, who have aimed the book at advanced undergraduate and graduate students as well as researchers in the field. Contributions from internationally acknowledged experts. Documents the substantial and exciting advances that have taken place in the subject over the last decade.
Download or read book Continent Formation Through Time written by N.M.W. Roberts and published by Geological Society of London. This book was released on 2015-02-16 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The continental crust is our archive of Earth history, and the store of many natural resources; however, many key questions about its formation and evolution remain debated and unresolved: What processed are involved in the formation, differentiation and evolution of continental crust, and how have these changed throughout Earth history?How are plate tectonics, the supercontinent cycle and mantle cooling linked with crustal evolution?What are the rates of generation and destruction of the continental crust through time?How representative is the preserved geological record? A range of approaches are used to address these questions, including field-based studies, petrology and geochemistry, geophysical methods, palaeomagnetism, whole-rock and accessory-phase isotope chemistry and geochronology. Case studies range from the Eoarchaean to Phanerozoic, and cover many different cratons and orogenic belts from across the continents.
Download or read book Combined U Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks Ellsworth Whitmore Mountains block Antarctica written by M.J. Flowerdew and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Volcanism and Subduction written by John Eichelberger and published by John Wiley & Sons. This book was released on 2013-05-02 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 172 .The Kamchatka Peninsula and contiguous North Pacific Rim is among the most active regions in the world. Kamchatka itself contains 29 active volcanoes, 4 now in a state of semi-continuous eruption, and I has experienced 14 magnitude 7 or greater earthquakes since accurate recording began in 1962. At its heart is the uniquely acute subduction cusp where the Kamchatka and Aleutian Arcs and Emperor Seamount Chain meet. Volcanism and Subduction covers coupled magmatism and tectonics in this spectacular region, where the torn North Pacific slab dives into hot mantle. Senior Russian and American authors grapple with the dynamics of the cusp with perspectives from the west and east of it, respectively, while careful tephrostratigraphy yields a remarkably precise record of behavior of storied volcanoes such as Kliuchevskoi and Shiveluch. Towards the south, Japanese researchers elucidate subduction earthquake processes with unprecedented geodetic resolution. Looking eastward, new insights on caldera formation, monitoring, and magma ascent are presented for the Aleutians. This is one of the first books of its kind printed in the English language. Students and scientists beginning research in the region will find in this book a useful context and introduction to the region's scientific leaders. Others who wish to apply lessons learned in the North Pacific to their areas of interest will find the volume a valuable reference.
Download or read book A Comparative Study on Zircon Hf Isotopes of Neoarchean Tonalite trondhjemite granodiorite TTG in Trans North China Orogen and Eastern Block of the North China Craton written by 葉念慈 and published by . This book was released on 2016 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U Pb and Hf Analysis of Detrital Zircons written by Kylie J. Matonia and published by . This book was released on 2009 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tectonics of the Indian Subcontinent written by A.K. Jain and published by Springer Nature. This book was released on 2020-04-07 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: This books documents the salient characters of the tectonic evolution of the Indian subcontinent. It showcases the well investigated subcontinent of Gondwana. The book is linked to an updated geological and tectonic map of this region on 1:12,000,000 in scale. The Indian subcontinent displays almost uninterrupted and unique the geological history since about Eo-Archean (~3800 Ma) to recent, with the development of many Proterozoic deformed and metamorphosed fold belts around Archean nuclei, and enormously thick undeformed platform deposits. After their stabilization during late Proterozoic, the subcontinent underwent Paleozoic rifting and deposition of coal-bearing thick sequences, followed by enormously-thick outpouring of Deccan volcanics as a consequence of huge mantle plume. The youngest event in its evolution is the Cenozoic Himalayan Orogenic Mountains, spanning the area between Nanga Parbat and Namcha Barwah; a part of which extends both in Pakistan and Myanmar.
Download or read book Fluids in the Crust written by K. Shmulovich and published by Springer Science & Business Media. This book was released on 1994-12-31 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: For much of the 20th century, scientific contacts between the Soviet Union and western countries were few and far between, and often super ficial. In earth sciences, ideas and data were slow to cross the Iron Curtain, and there was considerable mutual mistrust of diverging scient ific philosophies. In geochemistry, most western scientists were slow to appreciate the advances being made in the Soviet Union by os. Korz hinskii, who put the study of ore genesis on a rigorous thermodynamic basis as early as the 1930s. Korzhinskii appreciated that the most fun damental requirement for the application of quantitative models is data on mineral and fluid behaviour at the elevated pressures and temper atures that occur in the Earth's crust. He began the work at the Institute of Experimental Mineralogy (IEM) in 1965, and it became a separate establishment of the Academy of Sciences in Chernogolovka in 1969. The aim was to initiate a major programme of high P-T experimental studies to apply physical chemistry and thermodynamics to resolving geological problems. For many years, Chernogolovka was a closed city, and western scient ists were unable to visit the laboratories, but with the advent of peres troika in 1989, the first groups of visitors were eagerly welcomed to the IEM. What they found was an experimental facility on a massive scale, with 300 staff, including 80 researchers and most of the rest pro viding technical support.
