TY - JOUR
T1 - A volcanic production rate for the Mariana island arc
AU - Sample, J. C.
AU - Karig, D. E.
N1 - Funding Information:
This calculation arose from joint studies with R.W. Kay, who offered much trenchant advice and criticism. We have also benefitted from discussions with R.S.J. Sparks of the University of Cambridge. Support for this work came from Cornell University and from the N.S.F. SEATAR program.
PY - 1982/7
Y1 - 1982/7
N2 - Despite the importance of volcanic production rates along subducting plate boundaries, few reliable values are available. A well-constrained rate has here been determined for the past 5 m.y. in the Mariana island arc. The calculation covers the period during the opening of the Mariana Trough (an active back-arc basin) in which the volcanic centers are located and most volcanic products are contained. About half the extruded volcanic rocks occur in central cones, with the other half in a large volcanicclastic apron. After correction of volumes for porosity and for changes in mineral densities, the average extrusion rate of 12.4 km3/km/m.y. was calculated. The local rate varies along the arc roughly as does the subduction rate. Before quantification of that correlation can be made, however, apparent temporal fluctuations of volcanism on a global scale, which do not appear to be correlated with subduction rates, must be examined and explained.
AB - Despite the importance of volcanic production rates along subducting plate boundaries, few reliable values are available. A well-constrained rate has here been determined for the past 5 m.y. in the Mariana island arc. The calculation covers the period during the opening of the Mariana Trough (an active back-arc basin) in which the volcanic centers are located and most volcanic products are contained. About half the extruded volcanic rocks occur in central cones, with the other half in a large volcanicclastic apron. After correction of volumes for porosity and for changes in mineral densities, the average extrusion rate of 12.4 km3/km/m.y. was calculated. The local rate varies along the arc roughly as does the subduction rate. Before quantification of that correlation can be made, however, apparent temporal fluctuations of volcanism on a global scale, which do not appear to be correlated with subduction rates, must be examined and explained.
UR - http://www.scopus.com/inward/record.url?scp=0006561113&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0006561113&partnerID=8YFLogxK
U2 - 10.1016/0377-0273(82)90020-8
DO - 10.1016/0377-0273(82)90020-8
M3 - Article
AN - SCOPUS:0006561113
VL - 13
SP - 73
EP - 82
JO - Journal of Volcanology and Geothermal Research
JF - Journal of Volcanology and Geothermal Research
SN - 0377-0273
IS - 1-2
ER -