Geochemistry and Sr-Nd isotopic studies of Palaeoproterozoic (ca. 2.3 Ga) meta-lamprophyre from Rapuru area, Nellore Schist Belt, Southern India: Implication for back-arc basin magmatism and its relevance to the Columbia Supercontinent assembly

2021 ◽  
pp. SP513-2021-4
Author(s):  
Tushar Meshram ◽  
Satya Narayana Mahapatro ◽  
J. K. Aravind ◽  
M. L. Dora ◽  
Srinivasa Baswani ◽  
...  
Keyword(s):  
Source Region ◽  
Primary Source ◽  
Geodynamic Setting ◽  
Schist Belt ◽  
Content Type ◽  
Columbia Supercontinent ◽  
The World ◽  
Nellore Schist Belt ◽  
Supplementary Material ◽  
Back Arc

AbstractPresent study reports two lamprophyre dykes from the Rapuru area along the margin of Eastern Dharwar Craton (EDC) and Nellore Schist Belt (NSB). The Rapuru lamprophyre (RL) dykes are situated along southern extension of the Prakassam Alkaline Province (PAP). The Rapuru lamprophyre (RL) dykes are deformed yet preserves the porphyritic-panidiomorphic texture with mica phenocrysts and amphibole and feldspars in the groundmass. The geochemically RL have low Mg# (0.28-0.37), Ni (30 ppm - 60 ppm) and Cr (119 ppm - 228 ppm) concentration indicates their evolved nature like other reported lamprophyre from PAP and EDC. Which is a further supported Sr-Nd isotopic ratios shows affinity towards MORB-OIB like signature and juvenile magmatic nature. The RL seems to have inherited by two major influences, namely, primary source region: which is geochemically juvenile similar to the compositional field of enriched-MORB, and the continental lithosphere. Such magmas are known to have formed in the back-arc-basin environment. The initial 87 Sr/ 86 Sr ratio (∼0.7012-0.7045) and initial εNd (3.13 to 7.93) ratios are in line with the Back-Arc Basin Basalts (BABB) recorded in other parts of the world. The field observation and bulk-rock Sr-Nd radiogenic isotope in the present study support Palaeoproterozoic nature of RL. This concurrence of juvenile radiogenic isotopes and fluid-related trace element compositions apparently suggest dehydration of a subducted slab triggered metasomatism of the overlying mantle wedge in subduction related geodynamic setting. Such intrusive lamprophyre rocks of the older ages are limited in India as well as other part of the world. The rocks of 2.1 and 1.8 Ga, are widely considered to be the ages of initial accretion and final breakup of an erstwhile Columbia Supercontinent assembly. We argue that the RLs were formed in Palaeoproterozoic period during the waxing stages of the Columbia Supercontinent Assembly in BAB environment; most probably due to low degree of partial melting of asthenosphere and lithospheric interaction by the introduction of influx of subduction component into arc-back arc basin system.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5598266

Low-Ti gabbroic pluton in Dali, SW China: new evidence for back-arc lithospheric melting inducing the early-stage magmatism of the Emeishan large igneous province

2021 ◽  
pp. jgs2020-224
Author(s):  
Bei Zhu ◽  
Zhaojie Guo ◽  
Shaonan Zhang ◽  
Ning Ye ◽  
Ziye Lu ◽  
...  
Keyword(s):  
Early Stage ◽  
Large Igneous Province ◽  
Spinel Peridotite ◽  
Heavy Rare Earth Element ◽  
Content Type ◽  
Igneous Province ◽  
Supplementary Material ◽  
Back Arc ◽  
Emeishan Lip ◽  
Yangtze Plate

The latest studies proved contribution of the Emeishan mantle plume (the widely-regarded origin of the Emeishan LIP in the western Yangtze Plate. LIP: large igneous province) to the Palaeo-Tethys subduction. However, whether the Palaeo-Tethys subduction oppositely affected the formation of the Emeishan LIP remains poorly understood. Here, we report geochronological, petrological, geochemical and isotopic studies of a gabbroic intrusion in this LIP, located in Jiangwei, the Dali area. The gabbro has a weighted mean SHRIMP U-Pb age of ∼262 Ma. Key geochemical features include Nb, Ta and Ti depletion; Th, U and Sr enrichment, low light/heavy rare earth element ratios and ∼0.707 87Sr/86Sr(t) and ∼-0.21 εNd(t) values. We conducted pMELTS thermodynamic modeling and batch melting calculations to evaluate the origin and evolution of the gabbro, based on real components of low-Ti picrites and xenolith of the Yangtze lithosphere. The results support 3% melting of a hydrated spinel peridotite source from the Yangtze lithosphere can produce magma equivalent to the gabbro components. Integrating this conclusion with tectonic background of the western Yangtze Plate and volcano-stratigraphic record of the Emeishan LIP, we infer the early-stage magmatism of the Emeishan LIP was triggered by Paleo-Tethys back-arc extension with fluid modification from subductional slab.Supplementary material:https://doi.org/10.6084/m9.figshare.c.5433267

Timing and kinematics of the Variscan orogenic cycle at the Moldanubian periphery of the central Bohemian Massif

2021 ◽  
pp. jgs2021-096
Author(s):  
M. Machek ◽  
I. Soejono ◽  
J. Sláma ◽  
E. Žáčková
Keyword(s):  
Bohemian Massif ◽  
Large Scale ◽  
Content Type ◽  
Crustal Rocks ◽  
Tectonic Events ◽  
Dextral Shear ◽  
Supplementary Material ◽  
Orogenic Cycle ◽  
Back Arc ◽  
Lower Crustal

The high-grade complexes along the northern Moldanubian periphery of the central Bohemian Massif provide an outstanding structural record of all episodes of the Variscan collisional evolution. Kinematics and timing of orogenic processes have been examined by structural and microstructural study of middle and lower crustal rocks combined with xenotime and monazite geochronology. Four distinct tectonic events have been identified in the studied units. A first relict sub-horizontal fabric S1 associated with the HP/HT metamorphism is developed only in the lower crustal rocks and was related to back-arc extension or lower crustal flow in a supra-subduction domain. This fabric was at c. 340 Ma completely reworked to the sub-vertical foliation S2 by the major collisional thickening leading to the lower and middle crust juxtaposition. Thereafter, the extensional collapse of thickened orogenic system caused strong refolding to the HT sub-horizontal fabric at c. 325 Ma. The region was subsequently affected by the NNE–SSW oriented horizontal shortening related to the dextral shearing and clockwise rotation of crustal blocks adjacent to the large scale dextral shear zone, the Elbe Zone. It led to the fragmentation and reorientation of the Moldanubian margin to the current position.Supplementary material:https://doi.org/10.6084/m9.figshare.c.5708800.v1

Carboniferous sedimentary provenance and tectonic setting in the Darbut region of Western Junggar (NW China): evidence from mineralogy, geochemistry and detrital zircon U-Pb dating

2021 ◽  
pp. jgs2020-132
Author(s):  
Kai Weng ◽  
Yunpeng Dong ◽  
Xueyi Xu ◽  
Zhongping Ma ◽  
Bo Chen
Keyword(s):  
Detrital Zircon ◽  
Tectonic Setting ◽  
Chemical Compositions ◽  
Content Type ◽  
Clastic Rocks ◽  
Magmatic Rocks ◽  
Central Asian ◽  
Supplementary Material ◽  
Back Arc ◽  
T Values

The Carboniferous tectonic evolution of Western Junggar is crucial to understanding the subduction-accretion process of the Central Asian Orogenic Belt (CAOB), but the nature of this setting is still controversial. In this work, composite mineralogical, geochemical and detrital zircon U-Pb geochronological investigations have been conducted on Carboniferous clastic rocks in the Darbut region. The chemical compositions and sedimentary features show low sediment maturity and limited recycling, suggesting short-distance transportation and rapid accumulation. The samples contain igneous rock debris, mainly andesite and small amounts of basalt and granite, and a heavy mineral assemblage of Zr + Ap + Aug + Hbl + iron-bearing minerals (Hem-Lm, Ilm, Mag, and Py). The samples feature moderate ratios of Zr/Sc (average 15.47) and Th/Sc (average 0.61), and low ratios of La/Sc, Co/Th, and La/Th, as well as low Hf contents, suggesting intermediate to felsic arc-related igneous provenances. Detrital zircon grains from the clastic rocks show prominent age peaks in the Devonian and Carboniferous with positive εHf(t) values, indicating a consistent provenance associated with the Tiechanggou–Halaalate island arc. Combining the petrology, geochemistry and geochronology of the sedimentary and magmatic rocks, we conclude that the Darbut Carboniferous volcanic-sedimentary strata were deposited in a back-arc basin during ∼327-311Ma.Supplementary material:https://doi.org/10.6084/m9.figshare.c.5357293

Tracking Prototethyan assembly felsic magmatic suites in southern Yunnan (SW China): evidence for an Early Ordovician–Early Silurian arc–back-arc system

2021 ◽  
pp. jgs2020-221
Author(s):  
Guichun Liu ◽  
Guangyan Chen ◽  
M. Santosh ◽  
Xin Qian ◽  
Zaibo Sun ◽  
...  
Keyword(s):  
Geochemical Data ◽  
Early Paleozoic ◽  
Calc Alkaline ◽  
Content Type ◽  
Northern Margin ◽  
High K ◽  
Alkali Granites ◽  
Supplementary Material ◽  
Back Arc ◽  
Low K

Early Paleozoic trondhjemites, gneissic granites and alkali granites in southern Yunnan preserve important records of the tectonic evolution of the Prototethyan Ocean and regional correlations. Zircon ages suggest that these granitoids were emplaced from 476 to 436 Ma. The trondhjemites are characterized by high Na2O and low K2O contents, with εNd(t) values of −1.9 to −3.5 and εHf(t) values of −2.8 to +3.9. The trondhjemites were derived from an amphibolite source with a juvenile mafic component. The gneissic granites belong to the metaluminous low-K calc-alkaline series with an εNd(t) value of −6.2 and εHf(t) values of −5.0 to −0.4. The alkali granites belong to the high-K calc-alkaline series and yield εNd(t) values of −10.1 to −10.7 and εHf(t) values of −7.9 to −2.3. The gneissic granites were derived from an ‘ancient' lower mafic crust, whereas the alkali granites were derived from a meta-sedimentary source. These granitoids were formed during the subduction of the Prototethyan Ocean beneath the Simao Block and can be compared with similar igneous rocks from the Truong Son and Tam Ky-Phuoc Son zones in southern Laos. Our study, along with Early Paleozoic igneous suites from southern Laos, central Vietnam and the Malay Peninsula, suggests an arc–back-arc system along the northern margin of Gondwana.Supplementary material: Tables of zircon U–Pb and in-situ Hf and geochemical data are available at https://doi.org/10.6084/m9.figshare.c.5322386

An overview of textile and apparel business advances in Ethiopia

2018 ◽  
Vol 22 (3) ◽  
pp. 212-223 ◽  
Author(s):  
Karan Khurana
Keyword(s):  
Primary Source ◽  
Apparel Industry ◽  
Content Type ◽  
Textile And Apparel ◽  
The World ◽  
The Government ◽  
Clear Idea ◽  
Textile And Apparel Industry ◽  
Future Business ◽  
Made In

Purpose One of the oldest civilizations of Africa, Ethiopia is today at the advent of industrialization in various business sectors. Agriculture being a primary source of income (50 per cent of the GDP) is now transforming into more dynamic and new sectors. Textile and apparel is one of the sectors that has received a lot of attention from the government and the objective is to become sourcing destinations of the world. The purpose of the paper is to provide an overview of the current advances to the stakeholders, academia and industry from concept to the consumer. The aim of the paper is to present a transition of advances made in textile and apparel business that the country has made in the past decade and also to examine the potential of the consumer for this country. The consumer in the country is young and brings a lot of novel opportunities for textile and apparel industry. Design/methodology/approach This analysis is an empirical journey of the author’s research in academia and textile and apparel industry in Ethiopia. Findings This paper establishes a connection between the stakeholders, academia, industry and beneficiaries of this business so that it could become a guideline for future business investors. It also highlights the problems within this sector and provides a clear idea for domestic companies to compete with global competitors in terms of upcoming future business trends. Originality/value Presently, in the atmosphere of fashion and textiles, there is air about Ethiopia being the next manufacturing hub of the world in Africa. However, no academic literature is available which summarizes the opportunities and tasks in this industry, and this paper caters to the need of the hour.

Petrogenesis and dynamic implications of the Cenozoic alkali basalts from Jingpohu volcanic field, Northeast China.

2021 ◽  
pp. SP510-2020-137
Author(s):  
Xiang Bai ◽  
Wei Wei ◽  
Hongmei Yu ◽  
Zhengquan Chen
Keyword(s):  
Northeast China ◽  
Source Region ◽  
Volcanic Field ◽  
Alkali Basalts ◽  
Mantle Transition Zone ◽  
Content Type ◽  
The Holocene ◽  
Mantle Source Region ◽  
Supplementary Material ◽  
Primary Magmas

AbstractThe Cenozoic alkali basalts are widely exposed in the Jingpohu volcanic field, Northeast China. Previous volcanology and geochronology researches have revealed that they were formed in three periods of Miocene (∼29.23-13.59 Ma), Pleistocene (∼83.7 Ka), and Holocene (∼5500-5200 a BP). The Miocene and Pleistocene basalts consist of alkali olivine basalts, while the Holocene basalts are composed of alkali olivine basalts and leucite tephrites. Petrogenetic studies reveal that the primary magmas of the Miocene and Pleistocene alkali olivine basalts originated from partial melting of EM2-like garnet peridotites, and those of the Holocene alkali olivine basalts were derived from melting of EM1- and EM2-like garnet peridotites with higher garnet proportions. In contrast, the primary magmas of Holocene leucite tephrites were derived from melting of eclogites and peridotites. Combined with previous researches, we suggest that melting of the mantle source region to generate Jingpohu alkali basalts was triggered by decarbonization and dehydration of the slabs stagnated in the mantle transition zone.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5227666

The Oxford Handbook of Management in Emerging Markets

2018 ◽  
Keyword(s):  
Emerging Markets ◽  
Coming Out ◽  
Global Economy ◽  
Primary Source ◽  
Production Networks ◽  
Global Knowledge ◽  
Business Systems ◽  
Competitive Strategies ◽  
Fundamental Building Block ◽  
The World

Emerging Markets are the primary source of growth for business in the 21st century. This makes an understanding of managing businesses in emerging markets a fundamental building block for competing in today's global economy. This book's approach is to identify key elements of the business systems and competition in emerging markets around the world, and then to look at competitive strategies of local and multinational companies going into and coming out of these countries. Specific focus is offered on a selection of countries/regions. These emphases should serve both researchers and managers interested in knowing more about managing firms in emerging markets in general and in specific countries in particular. The essays highlight the tension between local and global knowledge, that is, views of business that apply everywhere around the world versus views that are particular to emerging markets. The essays also explore the role of local and international firms operating in emerging markets within global value chains or production networks.

How Phillips saw the light

2020 ◽  
Vol 36 (8) ◽  
pp. 29-31
Keyword(s):  
Design Methodology ◽  
Reading Time ◽  
Daily Basis ◽  
Business World ◽  
Content Type ◽  
Freak Show ◽  
The World ◽  
Pertinent Information ◽  
The One ◽  
Practical Implications

Purpose Reviews the latest management developments across the globe and pinpoints practical implications from cutting-edge research and case studies. Design/methodology/approach This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context. Findings The problem with developing a reputation of being something of an oracle in the business world is that all of a sudden, everyone expects you to pull off the trick of interpreting the future on a daily basis. Like a freak show circus act or one-hit wonder pop singer, people expect you to perform when they see you, and they expect you to perform the thing that made you famous, even if it is the one thing in the world you don’t want to do. And when you fail to deliver on these heightened expectations, you are dismissed as a one trick pony, however good that trick is in the first place. Originality/value The briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy-to-digest format.

Can housing rights be applied to modern housing systems?

2010 ◽  
Vol 2 (2) ◽  
pp. 103-117 ◽  
Author(s):  
Padraic Kenna
Keyword(s):  
International Law ◽  
Case Law ◽  
Epistemic Communities ◽  
Policy Makers ◽  
Content Type ◽  
Housing Systems ◽  
Effective Implementation ◽  
Housing Rights ◽  
The World ◽  
Effective Translation

PurposeThe purpose of this paper is to outline and examine the growing corpus of housing rights and assess their relevance and applicability to complex contemporary housing systems across the world.Design/methodology/approachThe paper sets out the principal instruments and commentaries on housing rights developed by the United Nations, regional and other bodies. It assesses their relevance in the context of contemporary analysis of housing systems, organized and directed by networks of legal and other professionals within particular domains.FindingsHousing rights instruments are accepted by all States across the world at the level of international law, national constitutions and laws. The findings suggest that there are significant gaps in the international law conception and framework of housing rights, and indeed, human rights generally, which create major obstacles for the effective implementation of these rights. There is a preoccupation with one element of housing systems, that of subsidized or social housing. However, effective housing rights implementation requires application at meso‐, micro‐ and macro‐levels of modern, dynamic housing systems as a whole. Epistemic communities of professionals develop and shape housing law and policy within these domains. The housing rights paradigm must be further fashioned for effective translation into contemporary housing systems.Research limitations/implicationsThe development of housing rights precedents, both within international and national law, is leading to a wide and diffuse corpus of legislation and case law. More research is needed on specific examples of effective coupling between housing rights and elements of housing systems.Originality/valueThis paper offers housing policy makers and lawyers an avenue into the extensive jurisprudence and writings on housing rights, which will inevitably become part of the lexicon of housing law across the world. It also highlights the limitations of housing rights implementation, but offers some new perspectives on more effective application of these rights.

The 2016 Police and Crime Commissioner elections

2017 ◽  
Vol 16 (2) ◽  
pp. 41-54 ◽  
Author(s):  
Peter Joyce
Keyword(s):  
Public Awareness ◽  
Primary Source ◽  
Source Material ◽  
Content Type ◽  
The Public ◽  
The Social ◽  
Key Issues ◽  
The Subject ◽  
The Government

Purpose The purpose of this paper is to analyse the 2016 elections for Police and Crime Commissioners (PCCs) and to compare them with those that took place in 2012. It seeks to evaluate the background of the candidates who stood for office in 2016, the policies that they put forward, the results of the contests and the implications of the 2016 experience for future PCC elections. Design/methodology/approach This paper is based around several key themes – the profile of candidates who stood for election, preparations conducted prior to the contests taking place, the election campaign and issues raised during the contests, the results and the profile of elected candidates. The paper is based upon documentary research, making particular use of primary source material. Findings The research establishes that affiliation to a political party became the main route for successful candidates in 2016 and that local issues related to low-level criminality will dominate the future policing agenda. It establishes that although turnout was higher than in 2012, it remains low and that further consideration needs to be devoted to initiatives to address this for future PCC election contests. Research limitations/implications The research focusses on the 2016 elections and identifies a number of key issues that emerged during the campaign affecting the conduct of the contests which have a bearing on future PCC elections. It treats these elections as a bespoke topic and does not seek to place them within the broader context of the development of the office of PCC. Practical implications The research suggests that in order to boost voter participation in future PCC election contests, PCCs need to consider further means to advertise the importance of the role they perform and that the government should play a larger financial role in funding publicity for these elections and consider changing the method of election. Social implications The rationale for introducing PCCs was to empower the public in each police force area. However, issues that include the enhanced importance of political affiliation as a criteria for election in 2016 and the social unrepresentative nature of those who stood for election and those who secured election to this office in these contests coupled with shortcomings related to public awareness of both the role of PCCs and the timing of election contests threaten to undermine this objective. Originality/value The extensive use of primary source material ensures that the subject matter is original and its interpretation is informed by an academic perspective.

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