GRD020OS0
M-99
Serpentinite
Mesozoic › Jurassic › Middle Jurassic
161.0
-
176.0
1
Ritter 154 › Cabinet 14 › Drawer M
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Two small cut samples. Both are sheared. The slightly larger sample has dark green clasts in a light green matrix. Abundant serpentine on the surface. The smaller sample has dark blue clasts in a light grey matrix. The sample has muscovite on the surface. Billet. Original description: sheared serpentine rock.
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Mexico
San Benito Island, Baja
Latitude: 28.31°
Longitude: -115.59°
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Inclusion-rich potassium feldspar
2.5
plane
Inclusion-rich potassium feldspar
2.5
crossed
Large, fracture olivine (?) surrounded by radiating tremolite crystals. Small brown biotite.
2.5
plane
Large, fracture olivine (?) surrounded by radiating tremolite crystals. Small brown biotite.
2.5
crossed
-
scan
crossed
GRD020OT0: TS cut too thick. Plagioclase, radiating tremolite (?), olivine (?), deep red mineral, biotite. Inclusion-rich potassium feldspar. Not a serpentinite? (C. Eichler)
N/A
Baldwin_GSAB_1992
Baldwin, S.L. and Harrison, T.M., 1992, The P-T-t history of blocks in serpentinite-matrix melange, west-central Baja California: Geological Society of America Bulletin, v. 104, no.1, p. 18-31.