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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Earth and Space Sciences · 术语表

什么是 Passive margin, ocean–continent transition, break-up unconformity？

又称： passive margin · ocean--continent transition · break-up unconformity

Definition 13.2 University Earth and Space Sciences — Year 1 · 第 13 章 — Rifts, Ridges and Passive Margins

A passive margin is the edge of a continent that was formed by rifting and is no longer a plate boundary: the continent and the adjacent ocean floor belong to the same plate. The ocean–continent transition is the zone of the margin, kilometres to tens of kilometres wide, between thinned continental crust and normal oceanic crust. The break-up unconformity is the unconformity that separates the sediments deposited in the rift basins, tilted with their blocks, from the undisturbed sediments laid over the margin after break-up.

From rift to passive margin (drawings, not to scale; the heights are exaggerated). (a) The brittle upper crust breaks along normal faults; blocks tilt into half-grabens that fill with sediment, and the Moho rises under the thinned crust. (b) At break-up the continental crust is cut through; the sea floods the rift and the first oceanic crust forms. (c) One of the two margins, carried away from the ridge: its tilted blocks and their sediments lie under the break-up unconformity, buried by the post-rift sediments of the shelf, slope and rise.

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