Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway

first_imgThe Ancestral South Sandwich Arc (ASSA) has a short life-span of c.20 m.y. (Early Oligocene to Middle-Upper Miocene) before slab retreat and subsequent ‘resurrection’ as the active South Sandwich Island Arc (SSIA). The ASSA is, however, significant because it straddled the eastern margin of the Drake Passage Gateway where it formed a potential barrier to deep ocean water and mantle flow from the Pacific to Atlantic. The ASSA may be divided into three parts, from north to south: the Central Scotia Sea (CSS), the Discovery segment, and the Jane segment. Published age data coupled with new geochemical data (major elements, trace elements, Hf-Nd-Sr-Pb isotopes) from the three ASSA segments place constraints on models for the evolution of the arc and hence gateway development. The CSS segment has two known periods of activity. The older, Oligocene, period produced basic-acid, mostly calc-alkaline rocks, best explained in terms of subduction initiation volcanism of Andean-type (no slab rollback). The younger, Middle-Late Miocene period produced basic-acid, high-K calc-alkaline rocks (lavas and pyroclastic rocks with abundant volcanigenic sediments) which, despite being erupted on oceanic crust, have continental arc characteristics best explained in terms of a large, hot subduction flux most typical of a syn- or post-collision arc setting. Early-Middle Miocene volcanism in the Discovery and Jane arc segments is geochemically quite different, being typically tholeiitic and compositionally similar to many lavas from the active South Sandwich island arc front. There is indirect evidence for Western Pacific-type (slab rollback) subduction initiation in the southern part of the ASSA and for the back-arc basins (the Jane and Scan Basins) to have been active at the time of arc volcanism. Models for the death of the ASSA in the south following a series of ridge-trench collisions, are not positively supported by any geochemical evidence of hot subduction, but cessation of subduction by approach of progressively more buoyant oceanic lithosphere is consistent with both geochemistry and geodynamics. In terms of deep ocean water flow the early stages of spreading at the East Scotia Ridge (starting at 17-15 Ma) may have been important in breaking up the ASSA barrier while the subsequent establishment of a STEP (Subduction-Transform Edge Propagator) fault east of the South Georgia microcontinent (< 11 Ma) led to formation of the South Georgia Passage used by the Antarctic Circumpolar Current today. In terms of mantle flow, the subduction zone and arc root likely acted as a barrier to mantle flow in the CSS arc segment such that the ASSA itself became the Pacific-South Atlantic mantle domain boundary. This was not the case in the Discovery and Jane arc segments, however, because northwards flow of South Atlantic mantle behind the southern part of the ASSA gave an Atlantic provenance to the whole southern ASSA.last_img read more

Oxford to launch first Mooc

first_imgOxford has announced today that it will run Massive open online courses (Moocs) for the first time, in connection with US platform edX. It will begin enrolling students for a course, beginning in February 2017, called “From Poverty to Prosperity: Understanding Economic Development”.The course will look at the role governments play as a catalyst for economic development. It will be headed by Sir Paul Collier, professor of economics and public policy at the Blavatnik School of Government.Moocs, free online courses typically based around lectures and readings, are an increasingly popular form of distance learning. They have seen exceptional growth in the USA in recent years, and have been praised for increasing access and affordability of higher education resources.The edX platform, also used by Harvard, the Sorbonne and the Massachusetts Institute of Technology, has nine million registered students and hosts over 900 online courses.Sarah Whatmore, pro vice-chancellor for education, said that the new project “will build capacity for the design and delivery of a range of other online education experiences.”“Oxford already has a strong reputation for delivering open educational resources that are used by students, academics and the public worldwide,” she added.Anant Agarwal, chief executive of edX and professor at the Massachusetts Institute of Technology, said the company was delighted that Oxford had joined the edX platform.“Our collaboration begins with content from the Blavatnik School to provide our nine million learners with access to an innovative programme that offer insights from a range of academic disciplines and a strong global outlook,” he said.“We are excited to partner with Oxford to further our shared mission to improve lives and increase access to high quality education for learners everywhere.”last_img read more

Press release: UK fashion brands take action to tackle modern slavery

first_imgBusinesses with a turnover of more than £36 million are already legally required to publish annual transparency statements, known as a Modern Slavery Statements, setting out what they are doing to stop modern slavery and forced labour practices occurring in their business and supply chains.Last month, to coincide with Anti-Slavery Day, the Home Office wrote directly to the Chief Executives of 17,000 businesses to remind them of their responsibilities, or face being publicly named. Modern slavery is an abhorrent crime that denies its victims of liberty, and it is disturbing to think that some of the products we buy could have been produced by someone exploited into forced labour. As global leaders in the fight against modern slavery, I am clear that this will not be tolerated in the UK – and our consumers won’t stand for it either. I welcome the action being taken by businesses which are leading the way in being open and transparent about the modern slavery risks they face, and have pledged to raise awareness to prevent slavery, protect vulnerable workers and help bring more criminals to justice. But with Modern Slavery police operations at an all-time high, clearly there is more to do to stamp out this vile crime and prevent criminal groups from operating in the shadows of supply chains to exploit people for commercial gain. The announcement follows the latest meeting of the Modern Slavery Taskforce, created by Prime Minister Theresa May, which discussed how to better identify and tackle forced labour in business supply chains.The UK’s multi-billion fashion industry employs tens of thousands of people, which can make its companies vulnerable to unscrupulous providers and criminals who exploit workers for their labour.The new agreement will commit its signatories, John Lewis, M&S, New Look, NEXT, River Island and Shop Direct, to work together with the Gangmasters and Labour Abuse Authority (GLAA), and others, to root out criminality and shine a light on hidden victims.These efforts to uncover hidden slavery in businesses come as activity to respond to modern slavery offences has reached an all-time high, with police forces across the UK running more than 920 live investigations in September, involving over 2,000 victims.The Prime Minister said:last_img read more

Student-athletes collect old issue gear for charity

first_imgPhoto courtesy of Andrew Helmin Senior Katherine McManus donates issued lacrosse gear in North Dining Hall for the One Shirt, One Body initiative.Junior Andrew Helmin said he came up with the idea last semester when his roommate, junior football player Cole Luke, was about to throw out the old athletic shoes and cleats he had been issued by the athletic department. Helmin, who is a member of the Irish track and field team, asked Luke if he could bring them home to give to his younger brother and his friends. The positive reaction from the kids was overwhelming, Helmin said, and it inspired him to start collecting issue gear to donate to local charities. “They’re saying, ‘Cole Luke wore these shoes,’ and you can see the excitement on their faces,” Helmin said.The concept of One Shirt, One Body, Helmin said, is more than just the tangible process of giving clothes to those in need. Issue gear that has actually belonged to college athletes excites and uplifts the recipients, he said.“We’re trying to go for this message of higher education, promoting people’s goals and really inspiring these individuals,” Helmin said.Helmin said he recalls visiting South Bend’s Center for the Homeless to give out football shirts and was struck by the enthusiasm it generated among the Center’s residents.“Athletes have a very big role in the community, and this clothing can make a difference in people’s lives,” he said.Working with junior football player Corey Robinson, Helmin said One Shirt, One Body began as a pilot program through Notre Dame but has quickly spread to a number of other colleges.Robinson pitched One Shirt, One Body to the ACC student-athlete advisory committee, Helmin said, and the idea was quickly supported by ACC schools as a conference initiative.One Shirt, One Body will also be featured at the NCAA convention in San Antonio this coming January, and Helmin said he has ambitious plans to grow the initiative.“Our goal is to get all Division I, II and III schools running this collection,” he said.Helmin said the model of One Shirt, One Body gives autonomy to individual schools, which are responsible for collecting donations from their athletes and then selecting the organizations that will receive the apparel.“This makes it very appealing because it’s customizable, it’s easy to implement, and you’re making a big impact with this clothing,” Helmin said.The athletic conferences currently adopting One Shirt, One Body include the WAC, Conference USA, the Patriot League and the Big Sky Conference, Helmin said.The rapid growth of One Shirt, One Body has been exciting, Helmin said, but he wants to perfecting how the program runs.“A lot of what we’re doing now is just trial and error and seeing where we can keep improving,” he said.Helmin said the best way to support One Shirt, One Body is by spreading the word about it on social media and talking to friends at other schools that have not yet adopted the program.Tags: athletics, issue gear, notre dame athletic department, One Shirt one body A new student-run campaign is changing the way student-athletes use issue gear. “One Shirt, One Body” gathers excess athletic apparel from student-athletes and distributes it to organizations in the community.last_img read more

What real millennials want to know about credit

first_imgby: Christine DiGangiLast week I talked to a bunch of 20- and 30-somethings — members of the so-called millennial generation — about credit, and the conversation reminded me about how differently people deal with money. In many aspects of personal finance, things aren’t black or white, and what works for one person would be disastrous for another. Something we try to emphasize at Credit.com is how important it is for consumers to do what works for them.At the same time, there are plenty of rights and wrongs in the credit world. During the weekly #MillennialTalk (my chat was May 12), many participants asked questions or shared common misconceptions about credit — these are things everyone should know, especially young people who are just starting to establish themselves financially.Debt & Credit Are Not the SamePeople use these terms interchangeably, but they’re not synonymous. Rod Griffin, Experian’s director of public education, explained it well in a tweet during the chat: “Credit is a financial tool. Debt is a financial problem.” continue reading » 7SHARESShareShareSharePrintMailGooglePinterestDiggRedditStumbleuponDeliciousBufferTumblrlast_img read more

PREMIUM‘It’s time to work together’: Comradeship among SMEs

first_imgGoogle Indonesia COVID-19 impact SMEs solidarity sales Drops market shopping-mall Small and medium enterprises (SMEs) are helping each other as many of them have begun to feel the impact of the Covid-19 pandemic on their business activities.Many small and medium companies, especially those involved in the retail sector have lost their customers as people avoid going to markets or malls in compliance with the government’s social distancing policy.Kania Annisa Anggiani, the founder of Chic & Darling, an all-women-run SME that creates and sells lifestyle products, reached out to her fellow business owners through her Instagram account, @kekekania, and offered to promote their products for free to her 36,300 followers.“Right now is not the time to compete. We’re all in survival mode,” she wrote on her post on Saturday, while asking for owners to list their businesses in the comment section and saying that she would make a directory … Log in with your social account Topics : Facebook Linkedin Forgot Password ? LOG INDon’t have an account? Register herelast_img read more

Parramatta Park among leading Cairns suburbs for growth in online clicks per property

first_imgVet nurse Raelene Massey along with daughter Andie Scott-Massey, are thrilled to have bought a beautiful Queenslander at 35 Upward St, Parramatta Park. PICTURE: JUSTIN BRIERTYRAELENE Massey has signed the dotted line and is now ready to start her next chapter in one of Cairns’ most sought-after suburbs.The vet nurse recently bought a historic Queenslander on Upward St, Parramatta Park, after living at Kewarra Beach for the past year.The allure of being close to schools, shops and watching the world go by from a sweeping veranda was hard to ignore for Massey, who moved to the Far North from the Sunshine Coast to be near her family.“The main reason I looked at Parramatta Park was because it’s close to St Monica’s, where my daughter goes to school, and we wanted to be able to enjoy the Esplanade and the inner-city lifestyle,” she said.Data released by realestate.com.au shows that Parramatta Park had the highest growth in the number of online visits per house out of all Cairns suburbs during the six months to March 31.The Queenslander-replete inner-city suburb recorded an average of 445 visits per property, a 45 per cent increase from the period between October 2015 and March last year.“I was particularly keen on Parramatta Park, but did have to look at other areas because it was so competitive,” she said.“But I really wanted a stunning Queenslander, which I’ve now found. My daughter and I are going to become very settled here.”Holloways Beach, with an average of 524 visits per house, was second on the list having recorded a growth of 38 per cent.More from newsCairns home ticks popular internet search terms3 days agoTen auction results from ‘active’ weekend in Cairns3 days agoWhen it came to units, Holloways Beach topped the charts with a 75 per cent increase in online visits per property.In terms of total number of online visits per house, Kamerunga and Edge Hill led the way, averaging 856 and 638 respectively.The Cairns region averaged 349 online visits per house during the six-month period, an increase of four per cent.Elite Real Estate’s Ken Higgins, who specialises in inner-city properties, said he was not surprised in the amount of interest shown for Parramatta Park homes.“There is plenty of activity around the area, and we have been getting some great number at open homes,” he said.“The nearby schools and shops are really attractive for people.”Higgins said another top-shelf Parramatta Park Queenslander, at 17 Denbeigh St, was quickly snapped up after it attracted more than 50 parties through its first open home.last_img read more

Royal Mail scheme names chief executive

first_imgJoanna Matthews, chair of the scheme’s trustee board, praised Law-Deeks’ leadership during his period as interim chief executive.“He has a clear vision for the plan that is aligned with the thoughts of both trustees and the sponsor,” she added.Law-Deeks said: “It is a real privilege to lead the plan, helping to ensure the financial wellbeing of our members in retirement. I look forward to delivering best-in-class services and innovation, working closely with Joanna, the trustees, and the sponsor.“I am also delighted to be leading such a great team of colleagues, who are some of the most talented in the business.”  The scheme’s sponsor, Royal Mail Group, in a joint effort with the Communication Workers’ Union, is currently lobbying government to implement legislation to allow the creation of a collective defined contribution (CDC) plan.The CDC switch was agreed after Royal Mail decided the annual costs of running a defined benefit plan would be too high in the future. A valuation report last year estimated annual contributions could hit £1.3bn. The UK’s Royal Mail Pension Plan (RMPP) has appointed Richard Law-Deeks as its chief executive officer with immediate effect.He replaces Chris Hogg, who left the £10.1bn (€11.4bn) fund last year to become chief executive of the National Grid UK Pension Scheme.Law-Deeks has been interim CEO since February. He was previously head of finance at the RMPP, having joined in 2015 from business consultancy Marsh & McLennan. He has also worked in accounting roles at several UK local authority pension funds, including Hackney and Hertfordshire.In a statement today, the RMPP said Law-Deeks would continue the work started by Hogg on developing “best-in-practice governance and risk management systems”.last_img read more

Canada Invests Over $12 Million Harbor Improvements

first_imgCoastal communities across Canada are supported by small craft harbors that provide the commercial fishing industry with safe and accessible facilities.With approximately 44,000 Canadians employed in this sector, the Government of Canada is making investments to renew its network of small craft harbors and work with municipalities and other stakeholders where investments and divestitures can enhance local communities.Yesterday, Jonathan Wilkinson, Minister of Fisheries, Oceans and the Canadian Coast Guard, and Ken McDonald, Member of Parliament for Avalon announced that the Government of Canada is investing over $12 million over two years in small craft harbor improvements and transfer projects in Avalon.These projects are part of a $40 million announcement for improvements to small craft harbors in Newfoundland and Labrador made last month by Seamus O’Regan, Minister of Veterans Affairs and Associate Minister of National Defense and the Member of Parliament for St. John’s South-Mount Pearl.A number of harbors have been identified for improvements:Reconstruction of the main wharf at Foxtrap Harbor;Reconstruction of the main wharf at Trepassey Harbor;Maintenance dredging at the Branch Harbor;Shore protection reconstruction at Calvert Harbor;Preparation work for the divestiture of the Small Craft Harbor site in Gaskiers;Clean up of North Harbor in St. Mary’s bay to return the site to its natural state;Preparation work for the divestiture of Spaniard’s Bay to the Town of Spaniard’s Bay;Increasing berthing space for Harbor users in Port de Grave.last_img read more