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There are no activity reports for Escanaba Segment.
Available Weekly Reports
There are no Weekly Reports available for Escanaba Segment.
Summary of eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|2260 BCE (?)||Unknown||Confirmed||0||Uranium-series||40 deg 59 min North|
The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.
Davis A S, Clague D A, White W M, 1998. Geochemistry of basalt from Escanaba Trough: evidence for sediment contamination. J Petr, 39: 841-858.
Goldstein S J, Murrell M T, Janecky D R, Delaney J R, Clague D A, 1992. Geochronology and petrogenesis of MORB from the Juan de Fuca and Gorda ridges by 238U-230Th disequilibrium. Earth Planet Sci Lett, 109: 255-272.
Tormanen T O, Koski R A, 2005. Gold enrichment and the Bi-Au association in the pyrrhotite-rich massive sulfide deposits, Escanaba Trough, southern Gorda Ridge. Econ Geol, 100: 1135-1150.
Volpe A M, Goldstein S J, 1993. 236Ra-230Th disequilibrium in axial and off-axis mid-oecan ridge basalts. Geochim Cosmochim Acta, 57: 1233-1241.
The linear, N-S-trending Escanaba Segment, the southernmost of the Gorda Ridge, lies immediately north of the Mendocino Francture Zone off the coast of northern California. The axial crest of the 130-km-long segment, also known as the Escanaba Trough, is about 3-5 km wide at the northern end and increases to 18 km to the south near the junction with the Mendocino Fracture Zone. The rift valley floor of the slow-spreading Escanaba rift segment lies at about 3200 m depth, bounded by faulted walls about 1500 m high with unusual gold-bearing massive sulfide deposits in sediment hills at the base of the scarps uplifted by volcanic sills or lacoliths. Thick sediment deposits from the continental margin enter the axial trough from the fracture zone and thin to the north. A preliminary uranium-series date of Holocene age was obtained from a basaltic lava flow in the axial valley in the less-sedimented northern part of the Escanaba Segment.