EXCESS HE-3 IN DEEP-WATER ON EAST PACIFIC RISE
EXCESS HE-3 IN DEEP-WATER ON EAST PACIFIC RISE
复制标题
DOI：
10.1016/0012-821x(75)90079-5
复制
发表时间：
1975-01-01
影响因子：
5.3
通讯作者：
BEG, MA
中科院分区：
文献类型：
--
作者：
CRAIG, H;CLARKE, WB;BEG, MA
氦同位素测量表明，东太平洋海隆顶部和两侧的水具有最高的3He丰度，在剖面的中层最大值处，相对于大气氦的3He/4He比值异常为+32%。与大气氦饱和相对应的3He溶解度异常为+50%。这些数据表明，大洋中部隆起顶端活跃的海底扩张地点是从地球内部注入海洋的原始氦的来源。这个通量中3He/4He的比值约为1.6×10−5，约为大气中的1.4×10−6的11倍。进入大气的3He总通量为4.6个原子cm−2秒−1，其中大部分(4.0个原子cm−2秒−1)由海洋通量提供。相应的3He在大气中的停留时间为106年，在供需(热逸出)的较大不确定性下，符合稳定状态的要求。
Helium isotope measurements show that water on the crest and flanks of the East Pacific Rise has the highest enrichment in3He so far observed in the oceans; the3He/4He ratio anomaly relative to atmospheric helium is + 32% at the mid-depth maximum in the profiles. The corresponding3He solubility anomaly relative to saturation with atmospheric helium is +50%. These data indicate that active sea-floor spreading sites on the crests of the mid-ocean rises are the sources of primordial helium injected into the ocean from the earth's interior. The3He/4He ratio in this flux is approximately 1.6 × 10−5, about 11 times the atmospheric ratio of 1.4 × 10−6. The total flux of3He into the atmosphere is 4.6 atoms cm−2earth-surface sec−1, most of which (4.0 atoms cm−2sec−1) is supplied by the oceanic flux. The corresponding atmospheric residence time for3He is 106years, which, within the large uncertainties of supply and demand (thermal escape), is consistent with the requirement for a steady state.