3He/4He ratios of pore gases in pore water and chemical composition of sediments at DSDP Sites 87-583 and 87-584

We have measured the 3He/4He and 20Ne/4He ratios of gases dissolved in the pore water in sediments at two sites in the Nankai Trough (Site 583) and the Japan Trench (Site 584). The 3He/4He and 20Ne/4He ratios vary from 0.215 * 10**-6 to 1.23 * 10**-6 and from 50 * 10**-3 to 2700 * 10**-3, respectively. These values can be explained by mixing two components, one from the atmosphere and one with a 3He/4He ratio of (0.2 to 0.3) * 10**-6. The latter component may be derived from the ocean crust near the subduction zone.

(Table 1) d18O of interstitial waters at DSDP Sites 87-582, 87-583, and 87-584

In the present paper, we report preliminary results on the 18O/16O ratios of the interstitial waters of the DSDP cores taken from subduction-related trenches near Japan: Sites 582 and 583 at the Nankai Trough off southwestern Japan, and Site 584 at the Japan Trench off northern Honshu, where thick piles of young sediments have accumulated. Special attention was paid to any differences in isotopic behavior of interstitial waters with different surrounding lithoiogy, the details of isotopic variation of interstitial waters in young, unconsolidated sediments, and the effects of sedimentary structural disturbance on interstitial waters.

University of Michigan Women's Golf Team, 1986/87

Back Row:?, Noel Bisson, Missy Bauer?, Head Coach Sue LeClair

Front Row: Donna Greenbury, Jan Idomir, ?, Terri Mage

Revised seasonally adjusted labor force statistics, 1978-87.

The material in this book is supplemented by Employment and earnings and Monthly labor review.

Trends in hospital diagnoses for black patients and white patients, 1980-87 /

"June 1995"--P. 2.

Nursing shortage in the hospital sector, 1982-87 : a background paper /

"December 6, 1988."

Symphonie [no. 7] en sol mineur, pour grand orchestre. Op. 87. Partition.

Mode of access: Internet.

Outlook '87 : proceedings.

Conference held Dec. 2-4, 1986.