Pole to equator temperature gradient for coniacian time, late cretaceous: Oxygen and carbon isotopic data on the Koryak upland and Hokkaido
Yuri D. Zakharov , Olga P. Smyshlyaeva , Alexander M. Popov , Tatiana A. Velivetskaya , Tamara B. Afanasyeva , Kazushige Tanabe , Yasunari Shigeta , Haruyoshi Maeda
Journal of Earth Science ›› 2012, Vol. 23 ›› Issue (1) : 19 -32.
Pole to equator temperature gradient for coniacian time, late cretaceous: Oxygen and carbon isotopic data on the Koryak upland and Hokkaido
The purpose of this study was to estimate the Coniacian latitudinal thermal gradient in the Northern Hemisphere. Both hemipelagic (ammonoids) and benthic (brachiopods and bivalves) δ 18O and δ 13C records were used. They originated from Coniacian shallow-water sequences across a wide range of paleolatitudes, from the Koryak upland (northern Kamchatka, Russian Far East) in the north, to Hokkaido (Japan) in the south. Among Coniacian ammonoids, both migrants from Hokkaido living in high latitudes (Kamchatka) and endemic forms dwelling in middle-low latitudes (Hokkaido) indicate seemingly close optimal growth temperatures. Nevertheless, certain differences in climatic conditions, prevailing during high-latitude coldest seasons, undoubtedly provoked growth cessation in some groups of ammonites. Our isotopic study suggests latitudinal temperature changes of only 0.12 °C per degree of latitude for the Northern Hemisphere in Coniacian times, while the average annual temperature in North Kamchatka seems about 3.3 °C lower than that in Hokkaido.
Coniacian / oxygen and carbon isotope / paleotemperature / Kamchatka / Hokkaido
| [1] |
|
| [2] |
|
| [3] |
|
| [4] |
|
| [5] |
|
| [6] |
|
| [7] |
Boersma, A., Shackleton, N. J., 1981. Oxygen and Carbon Isotope Variations and Planktonic-Foraminifer Depth Habitats, Late Cretaceous to Paleocene, Central Pacific, Deep Sea Drilling Project Sites 463 and 465. In: Thiede, J., Vollier, T. L., eds., Initial Reports of the Deep Sea Drilling Project, 62: 513–526 |
| [8] |
|
| [9] |
Clayton, R. N., Stevens, G. R., 1968. Paleotemperatures of New Zealand Belemnites. In: Stable Isotopes in Oceanographic Studies and Paleotemperatures, Tongiorgi (Spoleto, 1965). Pisa, Italy. 199–204 |
| [10] |
|
| [11] |
Coplen, T. B., Schlanger, S. O., 1973. Oxygen and Carbon Isotope Studies of Carbonate Sediments from Site 167, Magellan Rise, Leg 17. In: Edgar, N. T., Saunders, J. B., eds., Initial Reports of the Deep Sea Drilling Project, 17: 505–509 |
| [12] |
|
| [13] |
|
| [14] |
Douglas, R. G., Savin, S. M., 1975. Oxygen and Carbon Isotope Analyses of Tertiary and Cretaceous Microfossils from Shatsky Rise and Other Sites in the North Pacific Ocean. In: Larson, R. L., Moberly, R., eds., Initial Reports of the Deep Sea Drilling Project, 32: 509–520 |
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
| [19] |
|
| [20] |
|
| [21] |
|
| [22] |
|
| [23] |
|
| [24] |
|
| [25] |
|
| [26] |
|
| [27] |
|
| [28] |
|
| [29] |
|
| [30] |
|
| [31] |
|
| [32] |
|
| [33] |
|
| [34] |
|
| [35] |
|
| [36] |
|
| [37] |
|
| [38] |
|
| [39] |
|
| [40] |
|
| [41] |
|
| [42] |
|
| [43] |
|
| [44] |
|
| [45] |
|
| [46] |
|
| [47] |
|
| [48] |
|
| [49] |
|
| [50] |
|
| [51] |
|
/
| 〈 |
|
〉 |