在布莱克—巴哈马盆地的534号深海钻探计划(DSDP)场区,由海洋钻探国际阶段最进钻探的资料,得出扩张中心在北美大西洋边界裂口中漂移的一个确定的年代。测得布莱克山嘴异常的主要年代是卡洛夫期(约155百万年),该异常反映了扩张中心的漂移,而后者又标志着现代北大西洋的诞生。这比我们过去想的大约要年轻二千万年。这一结果的推论之一,就是使北大西洋裂口开始出现的这一扩张中心漂移,其时代可能与使墨西哥湾断裂终止所需的扩 In the DSDP field at 534 in the Black Bahamas basin, the most advanced drilling from the international phase of ocean drilling has led to a definitive period of expansion of the expansion center in the riparian gap at the North American Atlantic. The main age at which the Black Mountain Mouth was measured was the Kalov period (about 155 million years), which reflects the drift of the expansion center, which in turn marks the birth of the modern North Atlantic. This is about 20 million years younger than we used to think. One of the corollary of this result is the drift of this expanding center where the North Atlantic Rift began to appear, a time which may coincide with the need for expansion of the Gulf of Mexico break