(Table 2, page 607) Composition of manganese nodules in cores from Leg 16, Deep Sea Drilling Project

Buried manganese nodules or encrustations were encountered at five drill sites of Leg 16. Surface nodules were also sampled at two sites. With few exceptions, nodules within any one drill hole are fairly uniform in composition and are similar in composition to samples obtained previously from the eastern equatorial Pacific. Geochemical and paleontological evidence suggests that at least one of the buried samples was in situ when found and that at least one other was not. The remaining nodules may have fallen from the sediment surface to the positions in which they were found during the drilling process.

Leg 16航次的5个钻探站位均钻遇了埋藏型锰结核或锰结壳，另有2个站位采集了表层锰结核样品。除极少数例外情况外，单个钻孔内的锰结核成分均较为均一，且与此前从东赤道太平洋采集的样品成分相似。地球化学与古生物学证据表明，至少有一件埋藏样品在被发现时仍处于原位（in situ），而另有至少一件并非处于原位。其余锰结核可能是在钻探过程中，从沉积物表层沉降至最终被发现的位置。