南海中北部沉积成因类型

• 作 者: 苏广庆 范时清
• 机 构: 中国科学院南海海洋研究所海洋沉积研究室rrrrrrrrn,中国科学院南海海洋研究所海洋沉积研究室
• 出 处: 热带海洋
• 发表日期: 1987年02期
• 关键词: 沉积成因 陆源 重砂矿物 分带性 深海沉积 海岸变迁 海槽 水下阶地 沉积环境 粘土矿物

本文根据沉积物的粒度、生物、矿物、化学等特征,和沉积环镜、来源的不同,把本区沉积物分为四大类八种沉积成因类型。这些类型沉积的规律有:①沉积成因类型以陆源沉积为主,生物源次之,伴有火山源沉积;②沉积作用环陆分带性明显;③浅海残留砂是海岸变迁的反映;④放射虫泥和褐粘土是深海沉积的印证;⑤重砂矿物和锰结核的富集,受沉积成因类型和沉积环境的控制。

In this paper, the sediment is divided into four major types and eight types of sedimentary genetic types according to the features of sediment, such as grain size, biology, mineralogy and chemistry, and the different sedimentary rings and sources. The regularities of these types of sedimentation are as follows: (1) The types of sedimentary origin are mainly terrigenous sediments, followed by biogenic sources, followed by volcanic source sediments; (2) the sedimentary facies is obviously zonally circumscribed; (3) the shallow sea residual sand is a reflection of coastal changes; (4) Shrimp mud and brown clay are evidences of deep-sea sediments. ⑤ The enrichment of heavy sand minerals and manganese nodules is controlled by sedimentary genetic types and sedimentary environment.