Establishment of Upper Cretaceous bio- and carbon isotope stratigraphy in the northwest Pacific Ocean and radiometric ages around the Albian/Cenomanian, Coniacian/Santonian and Santonian/Campanian boundaries
Establishment of Upper Cretaceous bio- and carbon isotope stratigraphy in the northwest Pacific Ocean and radiometric ages around the Albian/Cenomanian, Coniacian/Santonian and Santonian/Campanian boundaries
复制标题
建立西北太平洋上白垩统生物和碳同位素地层以及阿尔布阶/塞诺曼阶、科尼亚阶/桑托阶和桑托阶/坎帕阶边界周围的辐射年龄
DOI：
10.1127/nos/2019/0472
复制
发表时间：
2019
影响因子：
2.2
通讯作者：
H. and Ando
中科院分区：
文献类型：
--
作者：
Takashima;R.;Nishi;H.;Yamanaka;T.;Orihashi;Y.;Tsujino;Y.;Quidelleur;X.;Hayashi;K.;Sawada;K.;Nakamura;H. and Ando
出露于日本北方北海道的叶佐群是太平洋地区为数不多的记录白垩纪古海洋学变化的地层之一。虽然该组产出丰富的海洋宏体和微体化石，零星出现的年龄诊断物种在几个地层间隔，阻止了高分辨率的国际生物地层对比。提议的出露于北海道西北部的Yezo群的综合生物和碳同位素地层学，能够实现从上Albian到下Campanian的高分辨率国际地层对比。本研究的对比确定了Albian/Cenomanian，Cenomanian/Turonian，Turonian/Coniacian，Coniacian/Santonian和Santonian/Campanian边界的详细地层层位，以及Yezo群中晚白垩世的古环境事件。耶佐群也是重要的，以补充白垩纪地质年代表的测年年龄，因为该组包括许多长英质凝灰岩。其中一些凝灰岩的锆石U-Pb年龄分别为99.7±0.3 Ma（Quidelders et al. 2011）、86.87±0.60/0.67（内部/总误差）Ma和84.7±0.7/1.8（内部/总误差）Ma，这些凝灰岩夹在Yezo群中Albian/Cenomanian、Coniacian/Santonian和Santonian/Campanian边界附近。这些放射性年龄与白垩纪最新的年龄模型一致。
The Yezo Group, exposed in Hokkaido, northern Japan, is one of the few strata that recorded Cretaceous paleo-oceanographic changes in the Pacific Ocean. Although the group yields abundant marine macro-and microfossils, sporadic occurrences of age-diagnostic species in several stratigraphic intervals has prevented high-resolution international biostratigraphic correlation. The proposed integrated bio-and carbon isotope stratigraphy of the Yezo Group, which is exposed in northwest Hokkaido, enables high-resolution international stratigraphic correlation spanning from Upper Albian to Lower Campanian. The correlation of the present study identifies the detailed stratigraphic horizons of the Albian/Cenomanian, Cenomanian/Turonian, Turonian/Coniacian, Coniacian/Santonian, and Santonian/Campanian boundaries, as well as the Late Cretaceous paleo-environmental events in the Yezo Group. The Yezo Group is also important in order to complement the chronometric age of the Cretaceous geologic time scale because the group includes numerous felsic tuffs. The U-Pb zircon ages of some of these tuffs, which are interbedded near the Albian/Cenomanian, Coniacian/Santonian and the Santonian/Campanian boundaries in the Yezo Group, are dated at 99.7±0.3 Ma (Quidelleur et al. 2011), 86.87±0.60/0.67 (internal/total error) Ma and 84.7±0.7/1.8 (internal/total error) Ma, respectively. These radiometric ages are consistent with the latest age model of the Cretaceous time scale.