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自从“挑战者”号探险以来(Murray and Renard,1891),发现大洋底磷质结核的绝对年龄问题与其成因问题有密切联系。 由于大洋中缺乏现代磷钙土,因而为磷酸盐是在过去的地质时期自海水的化学沉淀假说提供了基础。但是,如果现代磷钙土被发现,那么就可以通过直接观测来评价影响其形成的化学和生物因素。 有关生物遗骸、绝对年龄和一般地质环境的大量有用资料表明。大洋底已固结的磷钙土的时代要比早更新世老。然而发现纳米比亚(西南非洲)和智利大陆架沉积物表层的软的磷质结核显然是年青的,当将其组成与周周沉积物和间隙水的组成一起考查时,
Since the “Challenger” expedition (Murray and Renard, 1891), it has been found that the absolute age of phosphorus-based TB in the ocean is closely linked to its causes. Because of the lack of modern calcium carbonate in the oceans, it provides the basis for the phosphate deposition from the chemical precipitation hypothesis of seawater in past geologic times. However, if modern limestone is found, the chemical and biological factors that affect its formation can be evaluated by direct observation. There is a wealth of useful information on biological remains, absolute age and general geologic environment. The age of the consolidated calcium phosphate soil in the ocean floor is older than in the early Pleistocene. However, it was found that the soft-phosphorus nodules on the surface sediments of Namibia (Southwest Africa) and the Chilean continental shelf were apparently young, and when their composition was examined along with the composition of the periprocline sediment and interstitial water,