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3个岩石层主要板块——南极、南美和非洲板块,交汇于南大西洋中的布韦岛附近。中大西洋海岭(MAR)、西南印度洋海岭(SWIR)和美洲南极洲海岭(AAR)恰在这一区域向快速演变的板块三连点会聚。最近巨大的岩浆冲击已经形成新的西南印度洋海岭膨胀弓形体(Spioss Ridge),它以4～5cm/真的速率正向中大西洋海岭扩张,瓦解着先前的海岭-海岭-海岭(RRR)三连点。新的三连点可能在未来1Ma之中在北边大约70km处形成,西南印度洋海岭新生体的扩张将撞击中大西洋海岭。在中大西洋海岭与西南印度洋海岭的对峙过程中,大约70km段的中大西洋海岭将被美洲南极洲海岭所俘获,所以南极大陆的面积将有所增加。
The three main lithospheric plates - the Antarctic, South America and Africa, cross the island of Bouvet Island in the South Atlantic. The Central Atlantic Ridge (MAR), the Southwest Indian Ridge (SWIR) and the Americas Antarctic Ridge (AAR) converge on the rapidly evolving plate triple point just in this region. The recent immense magmatic impact has resulted in the formation of the new Southwest Indian Ridge Ridge Ridge, which is expanding at a rate of 4-5 cm / sec to the mid-Atlantic Ridge, disintegrating the previous RRR Tri-Link point. The new triple point may be formed about 70 km north of the next 1Ma and the expansion of newborn bodies in the southwestern Indian Ocean ridge will impact the mid-Atlantic Ridge. During the confrontation between the Mid-Atlantic Ridge and the Southwest Indian Ocean Ridge, the mid-Atlantic Ridge, about 70km in length, will be captured by the Americas Antarctic Ridge, so the Antarctic continent’s area will increase.