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首页> 外文期刊>Earth, planets and space: EPS >Utility of petrophysical and geophysical data to constrain the subsurface structure of the Kitakami plutons, northeast Japan
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Utility of petrophysical and geophysical data to constrain the subsurface structure of the Kitakami plutons, northeast Japan

机译：利用岩石物理和地球物理数据来约束日本东北的北上岩体的地下结构

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The Geological Survey of Japan (GSJ), AIST has been systematically measuring physical properties of basement rocks in Japan for more than 30 years and has started to construct a petrophysical database called PB-Rock 21 (Petrophysical Database of Basement rocks in Japan for the 21st Century, http://www.aist.go.jp/RIODB/ PB-Rock21/). The petrophysical data has been integrated with aeromagnetic data to determine the subsurface structure of the Himekami and Sobanokami plutons, members of the Kitakami plutonic belt, northeast Japan. For the Himekami pluton, the result of apparent magnetization intensity mapping clearly shows zonation within sub-plutons as well as regional rock type differences between the North (felsic) and South (felsic and mafic complex) sub-plutons. The bottom depths of the pluton were estimated by a successive 3-D magnetic modeling to be 1.7 km (North sub-pluton) and 1.5 km below sea level (South sub-pluton), respectively. Magnetic modeling of the Sobanokami pluton, which is partly exposed at the eastern edge of the Ishinomaki Plain, implies that the main part of the pluton extends to the northwest below the surface. Its western edge is cut by the Ishinomaki-wan fault, believed to be the upward extension of the fault plane of the 2003 northern Miyagi earthquake as defined by seismic observations and reflection seismic surveys conducted after the earthquake. Integrated magnetic and gravity modeling suggests that the Kakeyama Formation, a Neogene conglomerate deposited in a half-graben along the Ishinomaki-wan fault during Miocene rifting, contains more granitic fragments toward the south than to the north in the Ishinomaki Plain.
机译：日本地质调查局（GSJ）已在30多年来系统地测量了日本地下岩石的物理性质，并已开始建立一个名为PB-Rock 21的岩石物理数据库（日本21世纪的岩石岩石物理数据库） Century，http：//www.aist.go.jp/RIODB/PB-Rock21/）。将岩石物理数据与航空磁学数据进行了整合，以确定了日本东北北上岩体带的成员Himekami和Sobanokami岩体的地下结构。对于Himekami岩体，表观磁化强度映射的结果清楚地显示了亚岩体内部的分区以及北部（长岩体）和南部（岩体和镁铁质复合体）之间的区域岩石类型差异。通过连续的3D磁性建模估算出的海床底部深度分别为1.7 km（北亚海床）和低于海平面1.5 km（南亚海床）。 Sobanokami岩体的磁性模型部分暴露在石卷平原的东边缘，这意味着岩体的主要部分延伸到了地表以下的西北。它的西边缘被石卷湾断层切割，据信这是地震后进行的地震观测和反射地震勘测确定的2003年宫城北部地震断层平面的向上延伸。综合的磁和重力模拟表明，在中新世裂谷过程中，沿岩卷湾断层沿半岩沉积的新近系砾岩Kakeyama组含有比南北更多的花岗岩碎屑。

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