Isotopic and geothermodynamic studies of the granitic plutons

对日本西南部良轭带白垩系神原Tonalite进行了磷灰石锶同位素分析。它提供了神原调性岩中SrI非均质性的直接证据。SrI的非均质性是由里奥克带高SrI国家变质岩的同化作用引起的。天流地区原始岩浆与围岩的混合比例为3:7，下山地区为8:2。同化作用在天流地区更为显著。下山地区的神原闪长岩是在岩壁变质岩同化到20%后完全均质化后侵位的。这些炮位在0.15至0.44GPa的压力下发生。

Strontium isotopic analysis of apatite was carried out for the Cretaceous Kamihara Tonalite, Ryoke belt, southwestern Japan. It provides direct evidence of SrI heterogeneity in the Kamihara Tonalite. The SrI heterogeneity was caused by the assimilation of high SrI country metamorphic rocks of the Ryoke belt. The original magma and the wall rocks were estimated to be mixed in the ratio 3:7 for the Tenryu area and 8:2 for the Shimoyama area. The effect of assimilation is more significant in the Tenryu area. The Kamihara Tonalite in the Shimoyama area was emplaced after the assimilation of wall metamorphic rocks to an extent of 20% and subsequent complete homogenization. These emplacements occurred under a pressure ranging from 0.15 to 0.44GPa.