Large igneous provinces and mass extinctions: an update

The temporal link between mass extinctions and large igneous provinces is well known. Here, we examine this link by focusing on the potential climatic effects of large igneous province eruptions during several extinction crises that show the best correlation with mass volcanism: the Frasnian-Famennian (Late Devonian), Capitanian (Middle Permian), end-Permian, end-Triassic, and Toarcian (Early Jurassic) extinctions. It is clear that there is no direct correlation between total volume of lava and extinction magnitude because there is always sufficient recovery time between individual eruptions to negate any cumulative effect of successive flood basalt eruptions. Instead, the environmental and climatic damage must be attributed to single-pulse gas effusions. It is notable that the best-constrained examples of death-by-volcanism record the main extinction pulse at the onset of (often explosive) volcanism (e.g., the Capitanian, end-Permian, and end-Triassic examples), suggesting that the rapid injection of vast quantities of volcanic gas (CO 2 and SO 2 ) is the trigger for a truly major biotic catastrophe. Warming and marine anoxia feature in many extinction scenarios, indicating that the ability of a large igneous province to induce these proximal killers (from CO 2 emissions and thermogenic greenhouse gases) is the single most important factor governing its lethality. Intriguingly, many voluminous large igneous province eruptions, especially those of the Cretaceous oceanic plateaus, are not associated with significant extinction losses. This suggests that the link between the two phenomena may be controlled by a range of factors, including continental configuration, the latitude, volume, rate, and duration of eruption, its style and setting (continental vs. oceanic), the preexisting climate state, and the resilience of the extant biota to change

Information Literacy in MOOCs

Information literacy is a vital yet under-appreciated part of education. Its advocates recognize it as the foundation for lifelong learning, and as a set of skills that must be developed throughout a person\u27s education. Within academia at large, however, it is barely recognized at all. This paper discusses information literacy in the context of MOOCs, particularly of the connectivist variety. Models of information literacy and their accompanying standards are examined to establish connections to lifelong learning. The spectrum of MOOCs is discussed briefly, with an emphasis on connectivist MOOCs (cMOOCs) and their associated learning activities. These learning activities are then mapped to the information literacy standards of the Association of College and Research Libraries as a way of visualizing the relationship between the two. Several specific MOOCs are discussed with regards to their particular information literacy connections. This analysis of MOOCs shows that information literacy skills play a significant role in MOOC participation. Demographic studies of MOOCs show further that the majority of the participants can be expected to have well-developed information literacy skills. It is concluded that MOOC developers should give consideration to the role of information literacy in MOOCs

Men, women and the trouble with condoms: problems associated with condom use by migrant workers in rural Zambia

Understanding cultural attitudes to condoms is of the utmost importance in promoting their use as a means of protection against HIV transmission. This article examines condom use in relation to what people see as the purpose of sex, what good sex entails and how this relates to ideas of being a proper woman or man. It seems that the underlying and pervasive ideal is that sex is essentially a procreative act, since an emphasis on male potency and male and female fertility often overrides anxieties about contracting HIV and other sexually transmitted diseases. Hence condom use is usually only negotiated within some short-term relationships and then not consistently. Whilst both men and women have negative attitudes to condoms, women because of their economic and ideological dependence on men are in a much weaker position to negotiate condom use

Small business finance in two Chicago minority neighborhoods

The authors use survey data to measure the use of formal and informal sources of financing by owners of small businesses in two ethnic neighborhoods. The authors find substantial differences across ethnic groups in the amount of start-up funding obtained and in the use of trade credit.Small business ; Chicago (Ill.)

‘A productive and happy collaboration’: maximising impact through project design

This case study describes a highly collaborative project created to develop an online self-assessment tool that offers students the opportunity to plan their preparedness to enter the work place named the Preparation for Placement Assessment Tool. The aim of the project was to develop an artefact that aidsall students to think about and prepare for placements, and more broadly to be work-ready. It also aims to help disabled students to identify and manage their individual needs. Working in collaboration with students is offered as an effective strategy for improving project outcomes and managing the tensions for academics of balancing research, teaching, learning and scholarly activities.This paper discusses the project background, design and delivery, which includes the engagement of a diverse mix of students, and the practice research methodologies used. Discussion focuses on the project’s impact, particularly on the students involved. Four key factors: student power, methodology, the use of funding and slow burn are identified as significant for success

Mercury anomalies associated with three extinction events (Capitanian Crisis, Latest Permian Extinction and the Smithian/Spathian Extinction) in NW Pangea

Copyright © Cambridge University Press 2015. Strata of Permian - Early Triassic age that include a record of three major extinction events (Capitanian Crisis, Latest Permian Extinction and the Smithian/Spathian Extinction) were examined at the Festningen section, Spitsbergen. Over the c. 12 Ma record examined, mercury in the sediments shows relatively constant background values of 0.005-0.010 μg g -1 . However, there are notable spikes in Hg concentration over an order of magnitude above background associated with the three extinctions. The Hg/total organic carbon (TOC) ratio shows similar large spikes, indicating that they represent a true increase in Hg loading to the environment. We argue that these represent Hg loading events associated with enhanced Hg emissions from large igneous province (LIP) events that are synchronous with the extinctions. The Hg anomalies are consistent across the NW margin of Pangea, indicating that widespread mercury loading occurred. While this provides utility as a chemostratigraphic marker the Hg spikes may also indicate loading of toxic metals to the environment, a contributing cause to the mass extinction events