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1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

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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 Total alkali–silica diagram？

又称： total alkali--silica diagram

Definition 9.2 University Earth and Space Sciences — Year 2 · 第 9 章 — Magmatic Series and Tectonic Settings

The total alkali–silica diagram (TAS diagram) names a volcanic rock whose mode cannot be measured from its mass percentages of $\ce{Na2O + K2O}$ against $\ce{SiO2}$ , after the analysis has been recalculated to $100\,\%$ free of water and carbon dioxide. It is divided into fifteen fields by straight lines whose intersections have fixed coordinates (the figure after the next paragraph).

The TAS diagram (after Le Bas and others, 1986, as given by the British Geological Survey) with 456 lavas and intrusive rocks from Iceland (blue) and 580 from the Cascades (red), oxides as analysed. Pc picrobasalt, B basalt, O1 basaltic andesite, O2 andesite, O3 dacite, R rhyolite; S1 trachybasalt, S2 basaltic trachyandesite, S3 trachyandesite, T trachyte or trachydacite; U1 tephrite or basanite, U2 phonotephrite, U3 tephriphonolite, Ph phonolite, F foidite.

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