The Mozambique Channel plays a key role in the exchange of water masses between the Indian and Atlantic Oceans, which include the North Atlantic Deep Water (NADW) inflow from the south and the North Indian Deep Water (NIDW), an aged form of the NADW spreading poleward from the northern and equatorial Indian Ocean basin. Several authors assume that the Davie Ridge acts as a topographic barrier to the northward advection of NADW, which would therefore be absent in the Comoros Basin. Other studies suggest that the NADW flows from the south of the Mozambique Channel to the Comoros Basin, indicating that the Davie Ridge may not currently constitute a blocking topographic barrier to deep water mass circulation. To address this question, we studied ferromanganese (Fe, Mn) crusts collected over 2000 km in the Mozambique Channel, from the Agulhas Plateau to the Glorieuses Islands. Neodymium (Nd) isotope compositions (ε_Nd) of surface scrapings range between ε_Nd = −10.1 above the Agulhas Plateau, which might reflect the NADW inflow, and more radiogenic values between ε_Nd = −8.0 and −8.2 in the Glorieuses area, highlighting the NIDW influence. However, value of ε_Nd = −9.4 measured north of the Davie Ridge cannot be explained by the sole influence of the NIDW and therefore highlights the advection of the NADW northeast of the Comoros Basin. We estimate that the contribution of the NADW through the channel is up to 68% in the Agulhas Plateau and 60% north of the Davie Ridge. These findings are consistent with previous hydrographic studies and suggest that the Davie Ridge does not currently act as topographic barrier to deep currents.

莫桑比克海峡在印度洋和大西洋之间的水团交换中起着关键作用，其中包括从南部流入的北大西洋深水（NADW）和北美洲深水（NIDW）（NADW的一种旧形式）从北部和赤道印度洋盆地向极扩散。几位作者认为，戴维岭是北非对流平流的地形障碍，因此在科摩罗盆地中是不存在的。其他研究表明，NADW从莫桑比克海峡的南部流向科摩罗盆地，这表明戴维岭目前可能不构成阻碍深水物质循环的地形障碍。为了解决这个问题，我们研究了在莫桑比克海峡2000多公里处收集的锰铁（Fe，Mn）结壳，从Agulhas高原到Glorieuses群岛。钕（Nd）同位素组成（ε_钕表面刮出的）范围ε之间_的Nd  = -10.1上述阿古拉斯高原，这可能反映了NADW流入，和ε之间更放射性值_的Nd  = -8.0和-8.2在Glorieuses区域，突出NIDW影响。然而，ε的值_的Nd 的戴维岭= -9.4测量北不能由NIDW的唯一解释影响，因此突出了科摩罗盆地NADW东北的平流。我们估计，阿格哈斯高原地区通过该通道的NADW贡献高达68％，而戴维岭以北则高达60％。这些发现与以前的水文研究一致，表明戴维岭目前不作为深水流的地形障碍。