Accretion and uplifting of deep accretionary complex

在本研究项目中，我们成功地实现了增生杂岩深部的增生和隆升。结果如下。(1)日本四国中西部高P/T三坝川变质岩的原岩可分为22种岩石类型。(2)根据原岩序列，四国中西部的三八川变质岩中可以区分出大洋板块地层。(3)四国中部三八川变质带的巨型平卧褶皱。（1978）的观点可以在重建大洋板块地层学的基础上得到证实。(4)三坝川变质岩以“洗牌构造”为特征，显示泥质片岩注入到源自大洋板块地层的层序中。(5)在作为增生杂岩最深处的三坝川变质岩中，脱水释放的流体穿过推覆体边界，并在区域上增加了硼和氧同位素蚀变。

In this research project, we have succeeded in accretion and uplifiting of deepest part of accretionary complex. The results are as follows.(1) Protolith of the high-P/T Sanbagawa metamorphic rocks can be divided into 22 rock types in the central and western Shikoku, Japan.(2) On the basis of a sequence of protohlith, the oceanic plate stratigraphy can be distinguished in the Sanbagawa metamorphic rocks in the central and western Shikoku.(3) The Giant recumbent fold of the Sanbagawa metamorphic belt in the central Shikoku by Banno et al.(1978) can be confirmed based on the reconstructed oceanic plate stratigraphy.(4) The Sanbagawa metamorphic rocks are characterized by "Shuffled card structure" showing injection of pelitic schists into the sequences originated from the oceanic plate stratigraphy.(5) In the Sanbagawa metamorpphic rocks as a deepest part of accretionary complex, fluid released by dehydration pass through nappe boundaries and regionally gives addition of Boron and oxygen isotopic alterations.