(Table 1) Percentage of non-opaque heavy minerals, heavy residue, magnetite, and opaque heavy minerals, DSDP Sites 58-445 and 58-446@en

Heavy-mineral analyses were made for 39 samples, 27 from DSDP Site 445 and 12 from Site 446. About one-fourth of the samples were so loose that they were easily disaggregated in water. The amount of heavy residue and the magnetite content of the heavy fraction were very high, 0.2 to 44 per cent and (on the average) more than 20 per cent, respectively. Among the non-opaque heavy minerals, common hornblende (0 to 80%) and augite (0 to 98%) are most abundant. Pale-green and bluish-green amphiboles (around 10%) and the epidote group (a few to 48%) are next in abundance. Euhedral apatite and biotite and irregularly shaped chromite are not abundant, but are present throughout the sequence. Hacksaw structure is developed in pale-green amphibole and augite. […]本次研究对39件样品开展了重矿物分析（Heavy-mineral analyses），其中27件采自深海钻探计划（Deep Sea Drilling Project, DSDP）445站位，剩余12件采自446站位。约四分之一的样品极为松散，可在水中轻易解离分散。重砂残渣的占比以及重矿物组分中的磁铁矿含量均处于较高水平，分别为0.2%至44%，且平均占比超过20%。在非不透明重矿物中，普通角闪石（含量区间0~80%）与普通辉石（含量区间0~98%）最为富集。其次为淡绿-蓝绿色闪石（平均占比约10%）与绿帘石族矿物（含量区间为少量至48%）。自形磷灰石、黑云母以及不规则形铬铁矿的丰度虽不高，但在整个地层序列中均有分布。淡绿闪石与普通辉石中发育锯齿构造（hacksaw structure）。[…]