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首页> 外文期刊>Stratigraphy >Integrated stratigraphy of the Middle to Late Pliocene upper Miyazaki Group, southern Kyushu, Southwest Japan
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Integrated stratigraphy of the Middle to Late Pliocene upper Miyazaki Group, southern Kyushu, Southwest Japan

机译：日本西南部九州南部，上新世中期到上宫城组的综合地层

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Neogene sedimentary deposits are present in the Miyazaki region, southern Kyushu, on the Pacific side of southwestern Japan. The upper part of the Miyazaki Group, exposed in the Tsuma–Takanabe region of northern Miyazaki, is divided into the Tsuma, Sadowara, and Takanabe formations, in ascending order, and contains a planktic foraminiferal and calcareous nannofossil record of Pliocene events of the mid-latitude northwestern Pacific. The geological age of these units is based on magneto- and biostratigraphy. Five calcareous nannofossil datum horizons are recognized: the last occur-rence (LO) of Reticulofenestra pseudoumbilicus, the termination of acme zone II of Reticulofenestra minutula var. C, the LO of R. minutula var. B, calcareous nannofossil datum plane A, and the termination of acme zone I of R. minutula var. C. Six planktic foraminiferal bioevents are also recognized: a coiling direction change, from sinistral to dextral, in the genus Pulleniatina; the first occurrence (FO) of Globorotalia crassaformis; the LOs of Globorotalia margaritae, Sphaeroidinel-lopsis seminulina, and Dentoglobigerina altispira; and the FO of Neogloboquadrina asanoi. The presence of two calcareous nannofossil bioevents, Datum A and the termination of acme zone I of R. minitula var. C, suggests that the normal and reversed polarity intervals of the upper part of the Takanabe Formation correspond to Chron C2An.1n (latest Gauss Normal Epoch) and Chron C2r.2r (earliest Matuyama Reversed Epoch), respectively. Based on combined floral and faunal data and magnetostratigraphic chron boundaries from the ATNTS2004, the upper part of the Miyazaki Group is Middle to Late Pliocene in age.
机译：在日本西南太平洋的九州南部的宫崎地区，存在着新近系的沉积物。宫崎群的上部暴露在宫崎北部的Tsuma-Takanabe地区，按升序划分为Tsuma，Sadowara和Takanabe地层，并包含上新世中期中新世事件的板状有孔虫和钙质纳米化石记录。 -纬度西北太平洋。这些单位的地质年龄基于磁地层和生物地层学。钙质的纳米化石的五个基准层位被确认：假脐网的最后出现区域（LO），网状藤的acme区II的终止。 C，R。minutula var的LO。 B，石灰质纳米化石基准面A和小尖峰变种的顶角区I的终点。 C.还认识到六个有孔的有孔虫生物事件：Pulleniatina属从左旋到右旋的曲折方向变化;首次出现球孢白粉病（FO）;玛格丽塔球菌，半球孢子菌和半球藻的LO的LO;以及Neogloboquadrina asanoi的FO。两个钙质纳米化石生物事件的存在，基准面A和最小红变菌顶峰I区的终止。 C表示Takanabe组上部的法向和反极性间隔分别对应于Chron C2An.1n（最新的高斯正时纪）和Chron C2r.2r（最早的Matuyama反转纪元）。根据ATNTS2004的花卉和动物区系数据以及地层学年代学界线，宫崎骏群的上部年龄为上新世中期至中晚期。

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