Annotated record of the detailed examination of Mn deposits from ARA Islas Orcadas Cruise 16 core stations

The purpose of this volume, the seventh in a series of similar publications (Goodell, 1964, 1965, 1968; Frakes 1971, 1973 ; Cassidy et al., 1977), is to continue a presentation to the research community of sediment core descriptions and attendant data of cored and otherwise obtained sediments retrieved in waters of the Southern Ocean aboard the research vessel, ARA Islas Orcadas (formerly, USNS Eltanin), as a part of the circumpolar survey begun by Eltanin in 1962 (see issue of Antarctic Journal of the United States, Vol. 8, No. 3, 1973). The data presented herein are concerned with the results of coring activities aboard cruise 1678 of Islas Orcadas, the fith and final marine geology coring cruise of this vessel under the terms of the present United States-Argentine agreement. The core descriptions are organised as follows: 1) a brief summary of the coring objectives of the cruise, together with a discussion of core recovery; 2) a table and map of station location data for materials retrieved; 3) a table of tentative age-dates for each piston core; 4) an explanation of the laboratory procedures and descriptive criteria used in the description of the sediments, and 5) lithologic descriptions of the piston and trigger cores, and the piston and trigger core bag samples.

本卷为系列同类出版物的第七辑（Goodell, 1964, 1965, 1968; Frakes 1971, 1973; Cassidy等人, 1977），旨在持续向科研界公开南大洋海域中，通过钻探及其他方式获取的沉积物的岩心描述及配套数据。这些沉积物由科考船"ARA Islas Orcadas"号（前身为USNS Eltanin号）获取，是Eltanin号1962年启动的环南极勘测计划的一部分（详见《美国南极期刊》1973年第8卷第3期）。本卷收录的数据均与"ARA Islas Orcadas"号第1678航次的钻探作业成果相关，该航次是本船依据现行美阿合作协议开展的第五次也是最后一次海洋地质钻探航次。本次岩心描述的编排结构如下：1）本航次钻探目标的简要概述，以及岩心回收率情况的讨论；2）采集样品的站位位置数据表与分布图；3）各活塞岩心的暂定年代数据表；4）沉积物描述所采用的实验室流程与描述标准说明；5）活塞岩心、触发式岩心及其袋装样品的岩性描述。