Archean Layered Mafic-Ultramafic Intrusions in the West Pilbara Craton, Western Australia: A Synthesis of Some of the Oldest Orthomagmatic Mineralizing Systems in the World

2002 ◽  
Vol 97 (4) ◽  
pp. 847-872 ◽  
Author(s):  
D. M. Hoatson ◽  
S.-S. Sun
2020 ◽  
Author(s):  
Sam C. Spinks ◽  
Mark A. Pearce ◽  
Margaux Le Vaillant ◽  
David Fox ◽  
Ian M. Tyler ◽  
...  

Abstract Recently discovered Au in boulder conglomerate between the Mesoarchean West Pilbara superterrane basement and the overlying volcano-sedimentary stratigraphy of the Neoarchean Fortescue Group in Western Australia has renewed comparisons with the Witwatersrand conglomerate Au deposits in South Africa. As such, this has reignited the question of the Pilbara and Kaapvaal cratons being linked as part of the postulated Vaalbara continent during the Archean. However, little is known about the origin of the Pilbara conglomerate Au and its host conglomerates, as they are hitherto unstudied, and their formation and/or source is uncertain. Here we present a detailed study on the textures, composition, and sedimentology of one newly discovered Pilbara conglomerate Au deposit at the base of the Neoarchean Fortescue Group in the northwestern Pilbara craton. The Pilbara conglomerate Au occurrences are characteristically Ag-bearing but Hg-poor polycrystalline discoid masses that are overgrown by Au-poor chloritic halos, which are further enveloped by a hydrothermal alteration halo of disseminated Au within chlorite. Both the discoids and the auriferous chlorite halo are Ag bearing, with up to ~9 wt % Ag, consistent with a hydrothermal (orogenic) origin. The discoids do not display any physical or chemical evidence for sedimentary transport; thus, their formation (placer versus hydrothermal) remains unclear. However, the position of the Au in the conglomerate, limited to the basal section of the conglomerate, is difficult to account for in a purely hydrothermal deposit model. We argue the Pilbara conglomerate Au represents a modified placer deposit from a primary orogenic Au source, with surface evidence for sedimentation removed by partial dissolution during later hydrothermal alteration in the host conglomerate and the crystalline basement. While the basal Fortescue Group conglomerate Au shares commonalities with the time equivalent (>~2.7 Ga) Venterspost Conglomerate Formation, which overlies the Witwatersrand Supergroup, inconsistencies remain, with different Au chemistries and tectonic, magmatic, sedimentary, and metamorphic-metallogenic histories of the Pilbara and Kaapvaal cratons prior to deposition of the >2.7 Ga conglomerate sequences. This collectively indicates the drivers of Au metallogenesis and ultimate Au deposition in conglomerate facies were fundamentally different in the Pilbara and Kaapvaal cratons.


Crisis ◽  
2010 ◽  
Vol 31 (1) ◽  
pp. 30-35 ◽  
Author(s):  
Sudath Samaraweera ◽  
Athula Sumathipala ◽  
Sisira Siribaddana ◽  
S. Sivayogan ◽  
Dinesh Bhugra

Background: Suicidal ideation can often lead to suicide attempts and completed suicide. Studies have shown that Sri Lanka has one of the highest rates of suicide in the world but so far no studies have looked at prevalence of suicidal ideation in a general population in Sri Lanka. Aims: We wanted to determine the prevalence of suicidal ideation by randomly selecting six Divisional Secretariats (Dss) out of 17 in one district. This district is known to have higher than national average rates of suicide. Methods: 808 participants were interviewed using Sinhala versions of GHQ-30 and Beck’s Scale for Suicidal Ideation. Of these, 387 (48%) were males, and 421 (52%) were female. Results: On Beck’s Scale for Suicidal Ideation, 29 individuals (4%) had active suicidal ideation and 23 (3%) had passive suicidal ideation. The active suicidal ideators were young, physically ill and had higher levels of helplessness and hopelessness. Conclusions: The prevalence of suicidal ideation in Sri Lanka is lower than reported from the West and yet suicide rates are higher. Further work must explore cultural and religious factors.


1997 ◽  
Vol 2 (4) ◽  
pp. 356-365 ◽  
Author(s):  
Fouad A-L.H. Abou-Hatab

This paper presents the case of psychology from a perspective not widely recognized by the West, namely, the Egyptian, Arab, and Islamic perspective. It discusses the introduction and development of psychology in this part of the world. Whenever such efforts are evaluated, six problems become apparent: (1) the one-way interaction with Western psychology; (2) the intellectual dependency; (3) the remote relationship with national heritage; (4) its irrelevance to cultural and social realities; (5) the inhibition of creativity; and (6) the loss of professional identity. Nevertheless, some major achievements are emphasized, and a four-facet look into the 21st century is proposed.


2015 ◽  
pp. 30-53
Author(s):  
V. Popov

This paper examines the trajectory of growth in the Global South. Before the 1500s all countries were roughly at the same level of development, but from the 1500s Western countries started to grow faster than the rest of the world and PPP GDP per capita by 1950 in the US, the richest Western nation, was nearly 5 times higher than the world average and 2 times higher than in Western Europe. Since 1950 this ratio stabilized - not only Western Europe and Japan improved their relative standing in per capita income versus the US, but also East Asia, South Asia and some developing countries in other regions started to bridge the gap with the West. After nearly half of the millennium of growing economic divergence, the world seems to have entered the era of convergence. The factors behind these trends are analyzed; implications for the future and possible scenarios are considered.


2016 ◽  
Vol 13 (1) ◽  
pp. 7-26
Author(s):  
Glenn Odom

With the rise of the American world literature movement, questions surrounding the politics of comparative practice have become an object of critical attention. Taking China, Japan and the West as examples, the substantially different ideas of what comparison ought to do – as exhibited in comparative literary and cultural studies in each location – point to three distinct notions of the possible interactions between a given nation and the rest of the world. These contrasting ideas can be used to reread political debates over concrete juridical matters, thereby highlighting possible resolutions. This work follows the calls of Ming Xie and David Damrosch for a contextualization of different comparative practices around the globe.


2018 ◽  
Vol 11 (1) ◽  
pp. 27-50
Author(s):  
John Marsland

During the twenty years after the Second World War, housing began to be seen as a basic right among many in the west, and the British welfare state included many policies and provisions to provide decent shelter for its citizens. This article focuses on the period circa 1968–85, because this was a time in England when the lack of affordable, secure-tenured housing reached a crisis level at the same time that central and local governmental housing policies received wider scrutiny for their ineffectiveness. My argument is that despite post-war laws and rhetoric, many Britons lived through a housing disaster and for many the most rational way they could solve their housing needs was to exploit loopholes in the law (as well as to break them out right). While the main focus of the article is on young British squatters, there is scope for transnational comparison. Squatters in other parts of the world looked to their example to address the housing needs in their own countries, especially as privatization of public services spread globally in the 1980s and 1990s. Dutch, Spanish, German and American squatters were involved in a symbiotic exchange of ideas and sometimes people with the British squatters and each other, and practices and rhetoric from one place were quickly adopted or rejected based on the success or failure in each place.


2019 ◽  
Vol 41 (1) ◽  
pp. 40-50
Author(s):  
Claire Colebrook

There is something more catastrophic than the end of the world, especially when ‘world’ is understood as the horizon of meaning and expectation that has composed the West. If the Anthropocene is the geological period marking the point at which the earth as a living system has been altered by ‘anthropos,’ the Trumpocene marks the twenty-first-century recognition that the destruction of the planet has occurred by way of racial violence, slavery and annihilation. Rather than saving the world, recognizing the Trumpocene demands that we think about destroying the barbarism that has marked the earth.


2003 ◽  
Vol 33 (1) ◽  
pp. 153-160

The separation wall, one of the largest civil engineering projects in Israel's history, has been criticized even by the U.S. administration, with Condoleezza Rice stating at the end of June 2003 that it ““arouses our [U.S.] deep concern”” and President Bush on 25 July calling it ““a problem”” and noting that ““it is very difficult to develop confidence between the Palestinians and Israel with a wall snaking through the West Bank.”” A number of reports have already been issued concerning the wall, including reports by B'Tselem (available at www.btselem.org), the UN Office for the Coordination of Humanitarian Affairs (available at www.palestinianaid.info), and the World Bank's Local Aid Coordination Committee (LACC; also available at www.palestinianaid.info). UNRWA's report focuses on the segment of the wall already completed and is based on field visits to the areas affected by the barriers, with a special emphasis on localities with registered refugees. Notes have been omitted due to space constraints. The full report is available online at www.un.org/unrwa.


Author(s):  
Bożena Drzewicka

Conceptions And Interpretations of Human Rights in Europe and Asia: Normative AspectsThe issue of confronting values between civilizations has become very important. It influences not only the level of international politics but also the international normative activity. It is very interesting for the modern international law and its doctrine. The most important factor of causing huge changes in the system of international law is still the international human rights protection and the international humanitarian law which is related to it. It is very difficult to create one catalogue of executive instruments and procedures but it is possible to influence the attitude toward the basic paradigms. The frictions appear from time to time and move to other planes. The West and Asia are still antagonists in the dialogue on the future of the world. The article is a contribution to the intercivilizational dialogue.


Sign in / Sign up

Export Citation Format

Share Document