[M-GI27] データ駆動地球惑星科学

[MGI27-P08] レプリカ交換モンテカルロ法を利用したベイズ推論と地球化学分野への応用

*永田 賢二^1,2、桑谷 立^3,2、赤穂 昭太郎¹、岩森 光³ (1.国立研究開発法人産業技術総合研究所、2.JSTさきがけ、3.国立研究開発法人海洋研究開発機構)

キーワード：データ駆動的アプローチ、ベイズ推論、MCMC法

Geochemical data sets, such as major, trace and isotopic compositions, preserve precious information about various physical and chemical processes. For example, bulk compositions of igneous rocks directly reflect melting of original rocks, magma mixing and rock-fluid interaction in the earth's interior. However, it has been still difficult to extract physical and chemical processes quantitatively due to many unknown factors and insufficient quality of data sets. Recently, many sophisticated data-driven methodologies have been proposed to extract useful information from high-dimensional data sets in information sciences. In this presentation, we will introduce a data-driven analytical technique based on Bayesian estimation and replica exchange Monte Carlo (REMC) method, which is one of Markov chain Monte Carlo method, and its application to simultaneous estimation of melting ratios and a source mantle composition from MORB bulk compositions.