The 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.
you want to do business and occupy you have heard of the millions, tens of millions or even hundreds of millions of dollars of market share on the Internet? Do you want to make your brand through e-commerce unlimited extension on the Internet until
, known to every family?
when the whole world is in the vigorous development of electronic commerce and the 21 world acclaim, when many Internet based strategy and the birth of the new brand of fast, do you find that we always adhere to the system, process, science, innovation, strategy, optimal management, technology, personnel, performance management and other management core idea seems to be slowly weakening, and the use of electronic commerce overnight brand story is a staged, in the network economy pot, each of us invariably affected, unable to escape.
so now we can hear more and more people in the call to win in the electricity supplier, but also whether or not involved in the field of e-commerce, will sigh, twenty-first Century is the era of e-commerce". This voice, the expression of Chinese entrepreneurs mature and grow with the times. Can also be fortunate to say, after countless times of learning and seeing is true, our entrepreneurs on e-commerce enthusiasm and practice, began to show a little bit.
I often think, from a marketing perspective, e-commerce has changed the irresistible source to the needs of customers, the traditional enterprise into e-commerce is the inevitable requirement of enterprise to meet customer needs, achieve customer value. So, for a traditional enterprise, if the short-term contempt for electronic commerce, may cause the decline in sales and brand awareness of the weakening, but if the long neglected electronic commerce, may directly lead to completely defected customers, until a little loss of our hard set up in the traditional channel brand.
so, traditional enterprises how to build e-commerce strategy and put into practice, so as to obtain electricity supplier in the field of success? Home, we have to understand a concept: what is electronic commerce? In my opinion, from a broad perspective, non traditional business channels of business is electronic commerce.
e-commerce is not equal to engage in sales and promotion through the Internet, e-commerce broader than the scope of Internet marketing. Although we believe that "where the Internet is e-commerce" (all the Internet is based on profit, public welfare, communication, hobbies and other purposes), but the network marketing is just a branch of e-commerce. E-commerce refers to products, services or ideas to customers through the medium is non traditional communication channels, so as to obtain a kind of marketing our business purposes, we can according to this definition according to the non traditional channels to e-commerce simple classification, namely electronic commerce is divided into the network of Electronic Commerce (Web-BUY) TV shopping, shopping, advertising (tv-BUY) (Ad-BUY), (Mail-buy), the directory direct point of sales (O-O-BUY), point of sales (O-M-BUY) and other categories, of course, the classification is just a fan >