Geochemistry and minerals of glass shards at DSDP Leg 66 Holes@en

Deep Sea Drilling Project Leg 66 drilled eight sites along a transect across the Middle America Trench off Mexico, including continental (Sites 493 and 489), oceanic (Site 487), and trench (Site 486) reference sites and four sites (490, 492, 491, 488) in the trench inner wall. Because of their location - close to volcanic sources and subject to prevailing winds and marine currents (N to S, NW to SE) - analysis of airborne ashes intercalated within the sediments at these sites provides a reliable record of explosive volcanism in the area. […]深海钻探计划（Deep Sea Drilling Project）第66航次沿横穿墨西哥外海中美洲海沟的断面，在8个站位开展了钻探作业，其中包括陆壳站位（493、489号站位）、洋壳站位（487号站位）、海沟基准站位（486号站位）以及海沟内壁的4个站位（490、492、491、488号站位）。由于这些站位紧邻火山源区，且受盛行风向（北至南）与海流（西北至东南）影响，对这些站位沉积物中夹层的火山飞灰进行分析，可获取该区域爆炸性火山活动的可靠记录。[…]