Assessing bulk assimilation in granitic xenoliths

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400517
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Kochi University
• Principal Investigator: Kawabata Hiroshi 高知大学, 教育研究部総合科学系複合領域科学部門, 准教授 (90392943)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 同化作用 / ゼノリス / 花崗岩類 / 非平衡溶融 / マグマ混合 / 瀬戸内火山岩

Outline of Final Research Achievements

Crustal assimilation is one of the important magmatic processes especially for arc magmas. This study examined the petrological and geochemical evolution during xenolith assimilation on sub-meter scale, using the xenolith-bearing Miocene Setouchi volcanic rocks. A suite of rock samples indicates that xenolith assimilation proceeds through disequilibrium melting of granitic xenoliths and subsequent mixing of xenolith-derived porphyritic magmas with host andesitic magmas. Combined use of phase relations and thermal conductivity of xenoliths allows us to comprehensively understand the thermochemical and petrological change during assimilation.

Free Research Field

岩石学