Accretion and uplifting of deep accretionary complex

在本研究项目中，我们成功地进行了增生杂岩最深处的增生和隆升。结果如下：(1)日本四国中部和西部高p /T三川变质岩原岩可划分为22种岩石类型。(2)根据原岩石层序，在四国中部和西部的三巴川变质岩中可以区分洋板地层。(3) Banno et al.（1978）重建的洋板地层学可以确认四国中部三巴川变质带的巨型平卧褶皱。(4)三巴川变质岩具有“洗牌构造”特征，在洋板地层的层序中注入了泥质片岩。(5)三巴川变质岩作为增生杂岩的最深处，脱水释放的流体穿过推覆体边界，区域性地增加了硼氧同位素的变化。

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.