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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 Balanced cross-section？

Definition 13.10 University Earth and Space Sciences — Year 2 · 第 13 章 — Anatomy of a Mountain Belt: The Alps

A balanced cross-section is a cross-section of deformed rocks, drawn parallel to the direction of transport, that can be restored to a geologically reasonable undeformed state without gaining or losing rock: the lengths of marker beds and the areas of rock units in the section are conserved between the deformed and the restored states.

Line-length balance of a marker bed folded into chevrons with limbs dipping 40 (above), and the same bed restored between its pin lines (below), at true scale. Each limb keeps its length; the folded bed spans l = 30.0 40 = 23.0\, km, a shortening of 1 - 40 = 23.4\,\%. — Line-length balance of a marker bed folded into chevrons with limbs dipping $40{}^{\circ}$ (above), and the same bed restored between its pin lines (below), at true scale. Each limb keeps its length; the folded bed spans $l = 30.0\cos40{}^{\circ} = 23.0\,\mathrm{km}$ , a shortening of $1 - \cos40{}^{\circ} = 23.4\,\%$ .

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