The Identification of Milankovitch Cycles in the Gray-Level Series of Fe-Mn Crust from the Central Pacific Ocean and Its Growth Rate Evolution

• 责任者：Han Xiqiu (Key Laboratory of Submarine Geosciences ; Second Institute of Oceanography ; State Oceanic Administration ; Hangzhou 310012 ; China) ; Qiu Zhongyan
• 刊名：Acta Sedimentologica Sinica
• 出版年：2010
• 卷期：28(5)
• 关键词：米兰柯维奇理论 ; Milankovich theory ; 多金属结核 ; polymetal crust ; 太平洋 ; Pacific Ocean
• 页码：p.1006-1011
• 图表：4 illus., 3 tables, 15 refs.
• 分类号：0200
• issnNo：ISSN1000-0550
• isbnNo：CN62-1038/P

In this paper, a Fe-Mn crust sample (CB14) from a seamount in the central Pacific Ocean was studied in detail. Its outer layer can be divided into 5 sub-layers, no hiatus observed between the adjacent sub-layers. The gray-level variation series of the reflectivity of the growth pattern were obtained. The power spectral analysis revealed that most of the prominent cycles identified from gray-level series are corresponding to Milankovitch cycles. Through matching and tuning to the Milankovitch cycles, the authors obtained the growth rates of sub-layer 1 through sub-layer 5 and their corresponding ages. The results show that since Late Miocene, the growth rates of Fe-Mn crust changed alternatively, since recent 1.3 Ma, the growth rate of the Fe-Mn crust slowed down significantly.