New osmium isotope evidence for intracrustal recycling of crustal domains with discrete ages
Geology
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Abstract
New 187Os/188Os ratios of Quaternary Mount Adams volcanic rocks from the Cascade arc in southern Washington vary by >300% (187Os/188Os = 0.165-0.564) and fall into high (>0.319) and low (0.166 to 0.281) groups of 187Os/188Os ratios that are substantially more radiogenic than mantle values. These Os isotope compositions and groupings are interpreted to reflect recycling of discrete intracrustal domains with high 187Os/188Os ratios but differing ages, thus recording the process of crustal hybridization and homogenization. Os isotope compositions provide new constraints on amounts of intracrustal recycling in young subduction-zone environments that reflect the magmatic history of the arc. Sr, Nd, Hf, and Pb isotope variations in this young, mafic are complex are too small to allow such constraints.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | New osmium isotope evidence for intracrustal recycling of crustal domains with discrete ages |
| Series title | Geology |
| DOI | 10.1130/0091-7613(2003)031<0427:NOIEFI>2.0.CO;2 |
| Volume | 31 |
| Issue | 5 |
| Year Published | 2003 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geology |
| First page | 427 |
| Last page | 430 |
| Google Analytic Metrics | Metrics page |