• 责任者：Han Fei (Key Laboratory of Western China’s Environmental Systems ; Lanzhou University ; Lanzhou 730000 ; China) ; Sun Dongfu
• 刊名：Chinese Journal of Geophysics
• 出版年：2010
• 卷期：53(5)
• 关键词：新近纪 ; Neogene Period ; 磁性地层学 ; magnetostratigraphy ; 甘肃 ; Gansu Province
• 页码：p.1179-1186
• 图表：5 illus., 28 refs.
• 分类号：1200
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

yle="MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan" class=MsoNormal>yle="FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>Gaolan Hill section is in the southern Lanzhou ype w:st="on">Cityype> with a total thickness of ype="1" TCSC="0">240 m. 422 paleomagnetic block samples were obtained from the field with an approximate spacing interval of ype="1" TCSC="0">0.5 m (local refinement). The results show that the measured polarity column of the top strata of the Gaolan Hill section contains two large segments of negative polarity with four small segments of normal polarity events in between, which is consistent with the typical characteristic of the Gilbert Chron, and the normal polarity of the two ends corresponds to Chronype="1" TCSC="0">2A.3n and Chron3An.1n, respectively. The palaeomagnetic age of the Gaolan Hill section was determined ultimately as 6~3.5 Ma.