Magmatic And Sedimentary Constraints On The Evolution Of The Triassic Yidun Arc Eastern Tibet
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Magmatic And Sedimentary Constraints On The Evolution Of The Triassic Yidun Arc Eastern Tibet
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Author : Baiqiu Wang
language : en
Publisher:
Release Date : 2012
Magmatic And Sedimentary Constraints On The Evolution Of The Triassic Yidun Arc Eastern Tibet written by Baiqiu Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Geology categories.
Magmatic And Sedimentary Constraints On The Evolution Of The Triassic Yidun Arc Eastern Tibet
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Author : Baiqiu Wang
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-26
Magmatic And Sedimentary Constraints On The Evolution Of The Triassic Yidun Arc Eastern Tibet written by Baiqiu Wang and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-26 with categories.
This dissertation, "Magmatic and Sedimentary Constraints on the Evolution of the Triassic Yidun Arc, Eastern Tibet" by Baiqiu, Wang, 王伯秋, 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 Yidun Terrane in the eastern Tibetan plateau is separated from the Songpan-Ganzi Terrane by the Ganzi-Litang suture zone to the east and Qiangtang Block by the Jinsha suture zone to the west. Both suture zones are marked by eastern Paleo-Tethyan ophiolites. The western part of the Yidun Terrane, the Zhongza Massif, is dominated by Paleozoic sedimentary sequences. In the eastern part, Triassic subduction-related plutonic rocks and volcanic-flysch successions of the Yidun Group are important elements for understanding the evolution of eastern Paleo-Tethys and amalgamation of East Asia. The Yidun Group includes the Lieyi, Qugasi, Tumugou and Lanashan Formations from base upwards. Two major depocenters for the Yidun Group can be recognized. Sedimentary detritus supplying for the northern depocenter were dominantly sourced from the Zhongza Massif and received recycling components in a passive margin setting. In the southern depocenter, the Qugasi Formation accumulated materials from the Zhongza Massif, whereas the Tumugou Formation received additional materials from locally distributed Triassic arc rocks and crystalline basement rocks, which indicates transition from a passive margin to a magmatic arc setting. In the southern Yidun Terrane, (quartz-) dioritic hypabyssal intrusions are spatially associated with andesites and dacites and have zircon U-Pb ages from 230 to 215 Ma. They have adakitic geochemical features and are divided into the 230-215 Ma high silica (HSA) and 215 Ma low silica (LSA) adakitic rocks. The HSA formed from subducted slab melts with limited interaction with the overlying mantle wedge, whereas the LSA were generated from slab melts with more extensive interaction with mantle due to slab break-off at 215 Ma. In the northern Yidun Terrane, granitic plutons and volcanic rocks occur in two parallel N-S belts. The 228 Ma volcanic rocks in the Xiangcheng region are adakites generated from slab melts, whereas the 231-230 Ma volcanic rocks in the Changtai region, including basalts, andesites, dacites and rhyolites, formed in a back-arc setting. The Changtai basalts were produced by low degrees of partial melting of an OIB-like mantle source with minor involvement of subducted slab components. The Changtai andesites/dacites represent evolved members from the basaltic magmas through an AFC process, whereas the rhyolites formed from anatexis of a garnet-bearing crustal source. These volcanic rocks are 4-6 mys older than arc granitic rocks in the northern Yidun Terrane. The spatio-temporal framework of all the subdution-related igneous rocks suggests initiation of subduction of the Ganzi-Litang oceanic lithophere under the southern Yidun Terrane at 230 Ma, resulting in the adakitic magmatism in the Shangri-La and Xiangcheng regions and the back-arc magmatism in the Changtai region. Subsequently at 224 Ma, the subduction extended to the northern Yidun Terrane, leading to the formation of the arc granitic plutons. From south to north, the Yidun Terrane was sequentially amalgamated with the Songpan-Ganzi Terrane during the Late Triassic. DOI: 10.5353/th_b5060571 Subjects: Geology - Tibet, Plateau of
Magmatic And Sedimentary Constraints On The Evolution Of The Triassic Yidun Arc Eastern Tibet
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Author : Baiqiu Wang
language : en
Publisher:
Release Date : 2012
Magmatic And Sedimentary Constraints On The Evolution Of The Triassic Yidun Arc Eastern Tibet written by Baiqiu Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Geology categories.
Supercontinents Orogenesis And Magmatism
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Author : R.D. Nance
language : en
Publisher: Geological Society of London
Release Date : 2024-04-24
Supercontinents Orogenesis And Magmatism written by R.D. Nance and has been published by Geological Society of London this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-04-24 with Science categories.
This volume is a tribute to the career of J. Brendan Murphy and features papers by over 100 authors from countries all over the world: a testament to the high-profile and far-reaching influence of Brendan’s work. The topics covered fall into three broad categories that encompass Brendan’s main fields of influence: (1) supercontinents and the supercontinent cycle, including reconstructions and modelling; (2) orogenesis and terranes, with a focus on the Appalachian–Variscan and Central Asian orogenic belts and the oceans with which they are associated; and (2) magmatism and magmatic processes, centring on the geochemistry and isotopic compositions of magmas in arc and rift setting. Like Brendan’s own research, the scope of the papers spans the globe and ranges from strongly field-based studies to conceptual analyses. All of the articles, however, are focused on unravelling some critical aspect of geology or aimed at clarifying some crucial geological process. Hence, they also share a theme common to Brendan’s many contributions in emphasizing the importance of process-oriented research.
Uplift Mechanisms And The History Of The Tibetan Plateau
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Author : Junsheng Nie
language : en
Publisher: Geological Society of America
Release Date : 2014
Uplift Mechanisms And The History Of The Tibetan Plateau written by Junsheng Nie and has been published by Geological Society of America this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Science categories.
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Tectonics Of The Southeastern Tibetan Plateau And Its Adjacent Foreland
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Author : B. C. Burchfiel
language : en
Publisher: Geological Society of America
Release Date : 2012-01-01
Tectonics Of The Southeastern Tibetan Plateau And Its Adjacent Foreland written by B. C. Burchfiel and has been published by Geological Society of America this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-01 with Science categories.
"This volume provides a summary of the geology of Eastern and Southeastern Tibet and its foreland. It covers an area of approximately 1.5 million square kilometers in 15 chapters on tectonic units that the authors recognize during 25 years of both field and laboratory study. Each chapter discusses the authors' understanding of the geology and offers interpretations of special geological relations, both local and regional, as well as currently unresolved problems of which there are many in this vast and poorly known region. Chapter 16 summarizes and interprets the preceding chapters. The volume is accompanied by CDs containing four plates: two tectonostratigraphic maps, a map of unconformities and a plate of cross sections, in both Illustrator and ArcGIS formats. This is a unique map presentation and one that the authors suggest as a model for all geological maps"--Provided by publisher.
The Se Asian Gateway
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Author : Robert Hall
language : en
Publisher: Geological Society of London
Release Date : 2011
The Se Asian Gateway written by Robert Hall and has been published by Geological Society of London this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Continental drift categories.
Collision between Australia and SE Asia began in the Early Miocene and reduced the former wide ocean between them to a complex passage which connects the Pacific and Indian Oceans. Today, the Indonesian Throughflow passes through this gateway and plays an important role in global thermohaline flow. The surrounding region contains the maximum global diversity for many marine and terrestrial organisms. Reconstruction of this geologically complex region is essential for understanding its role in oceanic and atmospheric circulation, climate impacts, and the origin of its biodiversity. The papers in this volume discuss the Palaeozoic to Cenozoic geological background to Australia and SE Asia collision. They provide the background for accounts of the modern Indonesian Throughflow and oceanographic changes since the Neogene, and consider aspects of the region's climate history--
Tectonics Of The Himalaya
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Author : S. Mukherjee
language : en
Publisher: Geological Society of London
Release Date : 2015-09-28
Tectonics Of The Himalaya written by S. Mukherjee and has been published by Geological Society of London this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-09-28 with Science categories.
The Himalayan mountain belt, which developed during the India–Asia collision starting about 55 Ma ago, is a dramatically active orogen and it is regarded as the classic collisional orogen. It is characterized by an impressively continuous 2500 km of tectonic units, thrusts and normal faults, as well as large volumes of high-grade metamorphic rocks and granites exposed at the surface. This constitutes an invaluable field laboratory, where amazing crustal sections can be observed directly in very deep gorges. It is possible to unravel the tectonic and metamorphic evolution of litho-units, to observe the mechanisms of exhumation of deep-seated rocks and the propagation of the deformation. Himalayan tectonics has been the target of many studies from numerous international researchers over the years. In the last 15 years there has been an explosion of data and theories from both geological and geophysical perspectives. This book presents the results of integrated multidisciplinary studies, including geology, petrology, magmatism, geochemistry, geochronology and geophysics, of the structures and processes affecting the continental lithosphere. These processes and their spatial and temporal evolution have major consequences on the geometry and kinematics of the India–Eurasia collision zone.
Continental Reactivation And Reworking
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Author : Geological Society of London
language : en
Publisher: Geological Society of London
Release Date : 2001
Continental Reactivation And Reworking written by Geological Society of London and has been published by Geological Society of London this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Science categories.
As a result of its bouyancy, continental crust is rarely subducted meaning that successive episodes of continental deformation imparts a complex geological character that is not found in younger oceanic lithosphere.
Economic Geology And The Bulletin Of The Society Of Economic Geologists
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Author :
language : en
Publisher:
Release Date : 2003
Economic Geology And The Bulletin Of The Society Of Economic Geologists written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Geology, Economic categories.