Magnetostratigraphic correlation of Miocene regression-and-transgression boundaries in central Honshu, Japan.
Magnetostratigraphic correlation of Miocene regression-and-transgression boundaries in central Honshu, Japan.
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日本本州中部中新世海退边界的磁性地层对比。
DOI：
10.5575/geosoc.105.87
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
R. Matsumoto
中科院分区：
文献类型：
--
作者：
Y. Hiroki;R. Matsumoto
海退和海侵边界 (RTB) 定义在日本本州中部的弧后盆地八尾地区 (RTB Y1、Y2 和 Y3)、弧内盆地瑞浪地区 (RTB M1、M2 和 M3) 以及弧前盆地挂川地区 (RTB K1 和 K2) 的中新世地层中。 Yatsuo 和 Mizunami 地区的沉积序列由沿海陆架沉积物组成，RTB 被记录为不整合面或沟壑面。在挂川地区，厚泥岩中的浊积岩段（RTB K1）和侵蚀面（RTB K2）的中部可能代表最大海退。除了RTB M3形成于上新世时期外，公认的RTB形成于中新世。中新世 RTB 可以通过磁地层学在四个时区内进行关联； Chron C5Dn (17.62-17.28 Ma) 中的 Jmi1 区 (RTB K1)、Chron C5Br (16.01-15.16 Ma) 中的 Jmi2 区 (RTB Y1、M1 和 K2)、Subchron C5Bn1r (15.03-14.89 Ma) 中的 Jmi3 区 (RTB Y2 和 M2) 以及 Jmi4 区 (RTB) Y3) 14.89 至 12.3±1.9 Ma 之间。不同构造背景下Jmi2和Jmi3区RTB的同步性表明RTB是由区域海平面变化形成的。
Regression-and-transgression boundaries (RTBs) were defined in Miocene strata of the Yatsuo area (RTBs Y1, Y2, and Y3) in a backarc basin, the Mizunami area (RTBs M1, M2, and M3) in an intra-arc basin, and the Kakegawa area (RTBs K1 and K2) in a forearc basin, across central Honshu, Japan. The sedimentary successions of the Yatsuo and Mizunami areas consist of coastal-shelf deposits, and the RTBs are recorded as unconformities or ravinement surfaces. In the Kakegawa area, the middle of a turbidite section (RTB K1) and an erosional surface (RTB K2) in thick mudstone might represent maximum regressions.The recognized RTBs were formed in Miocene time, except for RTB M3 in Pliocene time. The Miocene RTBs can be correlated within four time zones by means of magnetostratigraphy ; Zone Jmi1 (RTB K1) in Chron C5Dn (17.62-17.28 Ma), Zone Jmi2 (RTBs Y1, M1, and K2) in Chron C5Br (16.01-15.16 Ma), Zone Jmi3 (RTBs Y2 and M2) in Subchron C5Bn1r (15.03-14.89 Ma), and Zone Jmi4 (RTB Y3) between 14.89 and 12.3±1.9 Ma. The synchronicities of the RTBs in Zones Jmi2 and Jmi3 in the different tectonic settings suggest that the RTBs were formed by regional sea-level changes.