DETERMINATION OF SEDIMENTARY RATE IN ESTUARY AND COAST BY ~(228)Th TECHNIQUE

• 作 者: 康兴伦 秦晓光
• 出 处: Chinese Journal of Oceanology and Limnology
• 发表日期: 2001年04期
• 关键词: RATE

Analysis of 232 Th, 230 Th , and 228 Th in sediments showed that there was an excess of 228 Th over that supported by the parents 232 Th or 228 Ra in sediments in many regions. This excess 228 Th with a half life of 1.91 years can be used for dating purpose over a time period of the order of a decade, so average sedimentary rates in the Yalujiang River Estuary, and in the Huanghe River Estuary and its adjacent Laizhou Bay can be obtained from decreases in the excess 228 Th activity as a function of depth in sediment.

Analysis of 232 Th, 230 Th, and 228 Th in sediments showed that there was an excess of 228 Th over that supported by the parents 232 Th or 228 Ra in sediments in many regions. This excess 228 Th with a half life of 1.91 years can be used for dating purpose over a time period of the order of a decade, so average sedimentary rates in the Yalujiang River Estuary, and in the Huanghe River Estuary and its adjacent Laizhou Bay can be obtained from decreasing in the excess 228 Th activity as a function of depth in sediment.