The Clarno Formation of central Oregon, U.S.A. - Volcanism on a thin continental margin

Details The Clarno Formation of central Oregon, U.S.A. - Volcanism on a thin continental margin The Clarno Formation of central Oregon, U.S.A. - Volcanism on a thin continental margin

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..34...56r&link_type=abstract

Earth and Planetary Science Letters, Volume 34, Issue 1, p. 56-66.

Other

1

Scientific paper

The Clarno Formation (mostly Eocene) of central Oregon, U.S.A., was formed as North America moved westward over subducting Pacific Ocean crust. The Clarno is a volcanic and volcanogenic assemblage whose flow rocks show: a calc-alkaline pattern on a Harker diagram, K2O-SiO2 diagram, alkali-SiO2 diagram, and AFM diagram; and a pattern transitional between calc-alkaline and tholeiitic on a SiO2-FeO*/MgO diagram. Its basalts are chemically similar to those of intra-oceanic island arcs (e.g.,sK2O of 0.30%), but subaerial deposition of the entire formation plus differentiation to rocks of high SiO2 and alkali contents indicate that the Clarno was formed on a continental margin. Comparison of the Clarno with other Pacific-margin volcanic suites indicates that the Clarno was formed on thin (20-30 km) continental crust overlying a subduction zone of about 120 km depth.

Affiliated with

Also associated with

No associations

Rating

The Clarno Formation of central Oregon, U.S.A. - Volcanism on a thin continental margin does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Clarno Formation of central Oregon, U.S.A. - Volcanism on a thin continental margin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Clarno Formation of central Oregon, U.S.A. - Volcanism on a thin continental margin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-799600