Annotated record of the detailed examination of Mn deposits from the Mariana Arc area, Pacific Ocean


A detailed geophysical and geological survey of the Mariana Trough, an actively extensional back-arc basin, was conducted in 1976 and 1977 to provide data for selection of drilling sites for DSDP Leg 60. These surveys revealed large-scale bathymetric trends, sediment distribution, crustal seismic veolocity structure, and earthquake activity that suggest the basin is opening around an axial spreading center tectonically similar to the slowly spreading Mid-Atlantic Ridge. There are, however, significant differences in the character of the trough, such as poorly defined magnetic anomalies, extreme bathymetric relief, and the frequent occurrence of low-magnitude earthquakes but absence of larger seismic events. Seafloor spreading in the Mariana Trough may be characteristic of the initial opening stages of any oceanic rift system, whether or not it is in a back-arc setting.

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Metadata Access
Creator Fryer, Patricia B; Hussong, Donald M
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1982
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 237 data points
Discipline Earth System Research
Spatial Coverage (141.866W, 1.757S, 177.347E, 48.403N); Pacific Oean
Temporal Coverage Begin 1977-04-02T00:00:00Z
Temporal Coverage End 1977-07-06T00:00:00Z