Field Guides Research Papers - Academia.edu (original) (raw)
- by Eric Roberts
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- Field Guides
- by Paul Myrow
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- Field Guides
- by Eric Erslev
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- Field Guides
- by David Greene and +1
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- Field Guides, Sierra Nevada, Internal Structure
The Ingalls Ophiolite Complex is a suprasubduction-zone ophiolite formed largely in a fracture-zone setting. Mantle tectonites are cut by a large, high-T shear zone overprinted by sheared serpentinite. Mafi c complexes of ca. 161 Ma... more
The Ingalls Ophiolite Complex is a suprasubduction-zone ophiolite formed largely in a fracture-zone setting. Mantle tectonites are cut by a large, high-T shear zone overprinted by sheared serpentinite. Mafi c complexes of ca. 161 Ma gabbro, sheeted dikes, and pillow lava occur as large blocks in the sheared serpentinite. An overlying Late Jurassic argillite unit contains minor chert, graywacke, and pebble conglomerate, along with lenses of ophiolite breccias. Detrital serpentinite forms some of these breccias, and mafi c blocks in other breccias range up to hundreds of meters in diameter. Older basement is locally present in the ophiolite complex, including (1) phyllite, metachert, and pillow basalt of the undated De Roux unit overlain by (2) Early Jurassic pillow lava, basalt breccia, and minor chert and oolitic limestone of the Iron Mountain unit (fossil seamount). This older basement indicates that at least part of the ophiolite is polygenetic. The presence of a high-T mantle she...
- by Gregory Harper and +1
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- Field Guides
- by Kirk Johnson
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- Field Guides
- by Pat Shanks and +1
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- Field Guides
- by Brian Witzke and +1
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- Field, Field Guides
- by Jim Tull
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- Field Guides
- by Pablo Dávila-Harris and +2
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- Field Guides
- by Richard Law
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- Field Guides
- by Bernd Lammerer and +1
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- Field Guides
- by Jack Epstein
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- Field Guides
- by Joshua A Keeley and +1
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- Field Guides
- by David Blake
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- Geology, Field Guides
- by Paul Doss
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- Field Guides