Ultramafic and basaltic rocks dredged from the nearshore flank of the Tonga Trench
Geological Society of America Bulletin
By: Robert L. Fisher and Celeste G. Engel
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Abstract
Deep dredging in the Tonga Trench (Southwest Pacific Ocean) at a depth of 9150 to 9400 m yielded fresh to granulated and serpentinized peridotite and dunite. Other rocks recovered there and at three stations deeper than 7000 m include basalts, tuffs, and tuffaceous agglomerates.
Chemical analyses of the fresh peridotite, with combined H2O < 0.10 weight percent, indicate that the rock consists of Si, Mg, Fe (6 percent), and Cr + Ni about 0.7 percent. Mineralogically, the peridotite contains forsteritic olivine and enstatite with minor spinels.
The ultramafic mass exposed at 9400 m probably is an accumulate exposed by faulting.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Ultramafic and basaltic rocks dredged from the nearshore flank of the Tonga Trench |
| Series title | Geological Society of America Bulletin |
| DOI | 10.1130/0016-7606(1969)80[1373:UABRDF]2.0.CO;2 |
| Volume | 80 |
| Issue | 7 |
| Year Published | 1969 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 6 p. |
| First page | 1373 |
| Last page | 1378 |
| Country | Samoa, Tonga |
| Other Geospatial | Pacific Ocean, Tonga-Kermedec Trench, Tonga Trench |
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