(Table 2) Apatite fission track results from sediment core CRP-3

The Cape Roberts drillhole 3 (CRP-3) on the western edge of the Victoria Land Basin, Antarctica cored through a highly altered igneous intrusion intruded into Paleozoic sedimentary basement. This intrusion was regarded as highly enigmatic as its origin could represent volcanism associated with early rifling of the Victoria Land Basin, later renewed rifting within the Terror rift, or Jurassic tholeiitic magmatism. Direct methods to date the intrusion by U-Pb dating of zircon or fission track analysis failed due to insufficient quantities of these minerals. Apatite fission track (AFT) analysis on the adjacent sedimentary basement, the Devonian Beacon Supergroup sandstone, yielded an age of 101 ± 6 Ma and a mean track length of 12.3 µm with a 1.9 µm standard deviation. The fission tracks were not annealed in the Cenozoic and thus the intrusion must be older than this. […]

南极洲维多利亚地盆地的西部边缘，位于罗伯茨角（Cape Roberts）的钻孔3（CRP-3）穿过了一层高度变质的火成岩侵入体，该侵入体侵入到古生代的沉积基底。这一侵入体因其起源的神秘性而备受关注，其可能代表了与维多利亚地盆地在早期裂谷期相关的火山活动，或者在恐怖裂谷（Terror rift）内的后期裂谷活动，亦或是侏罗纪的透辉岩浆活动。由于这些矿物数量不足，直接通过锆石U-Pb定年法或裂变径迹分析来对侵入体进行年代测定的方法均告失败。对邻近的沉积基底——志留纪的比肯超群砂岩——进行的磷灰石裂变径迹（AFT）分析得出，其年龄为101 ± 6百万年，平均径迹长度为12.3微米，标准偏差为1.9微米。这些裂变径迹在新生代未发生退火，因此该侵入体必须比新生代更古老。