(Table 1) Light minerals in sand at DSDP Leg 84 holes

The Middle America active continental margin is the best-sampled active plate margin to date, having been drilled during Legs 84, 67, and 66. With nine sites drilled on the continental slope of Guatemala and an additional site drilled on the Costa Rican slope, a summary of slope sediments and sedimentary processes can be made.

中美洲活动大陆边缘（Middle America active continental margin）是迄今为止采样数据最为完备的活动板块边缘，其相关钻探工作已在第84、67及66航次中完成。本次钻探在危地马拉大陆坡布设9个钻探站位，另在哥斯达黎加大陆坡布设1个钻探站位，据此可对该区域大陆坡沉积物及沉积作用过程开展系统性总结。