3He and methane in the Gulf of Aden
3He and methane in the Gulf of Aden
复制标题
3亚丁湾的氦气和甲烷
DOI：
10.1016/0016-7037(90)90199-u
复制
发表时间：
1990
影响因子：
5
通讯作者：
N. Mihalopoulos
中科院分区：
文献类型：
--
作者：
P. Jean;S. Belviso;G. Alaux;B. C. Nguyen;N. Mihalopoulos
在1987年7月的OCEAT考察中，我们在西示巴海岭（亚丁湾）的6个测站测量了~ 3 He和甲烷的垂直和空间分布。结果表明，δ 3 He异常显著，异常率达49%。我们的结论是，这个信号的起源是独立于著名的红海hydrothermal 3 He（红海卤水）。因此，活跃的热液活动发生在这个伸展盆地与扩展沿着一个初始的洋中脊。来自亚丁湾的~ 3 He输入是造成印度洋西部~ 3 He浓度南北向正梯度的主要原因。还存在几种甲烷异常（高达664 nl/l，即，25倍的区域甲烷背景），但CH 4和3 He信号没有系统的相关性，表明这些地区甲烷的产生和消耗机制复杂。我们的结果证实了以前在西南太平洋的观测结果。
During the OCEAT cruise (July, 1987), the vertical and spatial distributions of3He and methane were measured at six stations over the West Sheba Ridge (Gulf of Aden). The results show significant δ3He anomalies (up to 49%). We conclude that the origin of this signal is independent from the well-known Red Sea hydrothermal3He (of Red Sea Brines). Thus, active hydrothermalism occurs in this extensional basin associated with spreading along an incipient mid-ocean ridge. The3He input from the Gulf of Aden accounts for the S-N positive gradient in3He concentration observed in the western part of the Indian Ocean. Several methane anomalies are also present (up to 664 nl/l, i.e., 25 times the regional methane background), but the CH4and3He signals are not systematically correlated, suggesting complex production and consumption mechanisms of methane in these areas. Our results confirm previous observations in the South West Pacific Ocean.