Usui, Tomohiro et al. (2003) Fate of the subducted Farallon plate inferred from eclogite xenoliths in the Colorado Plateau, Geology, 31, 589–592, doi: 10.1130/0091-7613(2003)031<0589:FOTSFP>2.0.CO;2. < 20200421154037-588998 > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    We present the first finding of the high-pressure mineral coesite in lawsonite-bearing eclogite xenoliths from the Colorado Plateau, United States. The presence of coesite in these xenoliths supports the hypothesis that the eclogite formed in a low-temperature–high-pressure environment such as envisaged inside subducted oceanic lithosphere. Ion-microprobe U-Pb dating of micrometer-scale zircons in the eclogites yields ages ranging from 81 Ma to 33 Ma, the two extremes in age likely indicating the age of crystallization during subduction-related metamorphism and the age of recrystallization by the host magmatic event, respectively. These observations conclusively demonstrate that certain eclogite xenoliths from the Colorado Plateau originated as fragments of the subducted Farallon plate, which had been residing in the upper mantle since the Late Cretaceous. This is the first conclusive evidence that any eclogite xenoliths can be directly linked to a known subducted plate.

  • doi: 10.1130/0091-7613(2003)031<0589:FOTSFP>2.0.CO;2
  • modified at 10 h ago
MR-7 < 20150902133514-295338 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau zoisite-eclogite
  • modified at 2020-04-22
MR-4 < 20150902133424-049785 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau zoisite-eclogite
  • modified at 2020-04-22
MR-15 < 20150902133522-846170 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau zoisite-eclogite
  • modified at 2020-04-22
GR-1-010 < 20150902133342-797958 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau lawsonite-eclogite
  • modified at 2020-04-22
name box-type global-id
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GR1_Grt_reaction rim_2003 pub EPMA JEOL JXA-8800R 12 20200422115436-071310
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MR-4_Grt_reaction rim_2003 pub EPMA JEOL JXA-8800R 12 20200422115437-939870
MR-7_Grt_rim_2003 pub EPMA JEOL JXA-8800R 12 20200422115437-398628
MR-7_Grt_core_2003 pub EPMA JEOL JXA-8800R 12 20200422115436-152140
GR1_Grt_rim_2003 pub EPMA JEOL JXA-8800R 12 20200422115436-022155
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Lws4_matrix pub EPMA JEOL JXA-8800R 11 20191023101327-996430
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Grt10 pub EPMA JEOL JXA-8800R 11 20191021155343-490884
Grt11 pub EPMA JEOL JXA-8800R 10 20191021155343-447351
Grt12 pub EPMA JEOL JXA-8800R 11 20191021155344-899945
Grt13 pub EPMA JEOL JXA-8800R 10 20191021155344-570648
Grt14 pub EPMA JEOL JXA-8800R 10 20191021155344-232979
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Grt16 pub EPMA JEOL JXA-8800R 10 20191021155345-462773
Grt17 pub EPMA JEOL JXA-8800R 10 20191021155345-253463
MR-7_Lw_inclusion pub EPMA JEOL JXA-8800R 12 20191017142447-678272
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MR-7_Or_inclusion pub EPMA JEOL JXA-8800R 11 20191017143540-459353
MR-7_Grt_mantle pub SIMS Cameca ims-5f 13 20191017151312-091751
MR-15_Grt pub ICPMS Yokogawa PMS2000 22 20191017155502-476714
MR-15_Cpx pub TIMS Thermo-Fisher MAT261/262 5 20191018120301-316408
MR-15_Cpx pub TIMS Thermo-Fisher MAT261/262 5 20191018120248-378415
MR-15_Cpx pub TIMS Thermo-Fisher MAT261/262 12 20191018120144-087728
MR-15_Cpx pub ICPMS Yokogawa PMS2000 22 20191017155503-118757
MR-15_Zo pub TIMS Thermo-Fisher MAT261/262 5 20191018120302-203438
MR-15_Zo pub TIMS Thermo-Fisher MAT261/262 5 20191018120249-255853
MR-15_Zo pub TIMS Thermo-Fisher MAT261/262 12 20191018120147-896449
MR-15_Zo pub ICPMS Yokogawa PMS2000 22 20191017155505-430189
MR-15_Grt pub TIMS Thermo-Fisher MAT261/262 5 20191018120303-881405
MR-15_Grt pub TIMS Thermo-Fisher MAT261/262 5 20191018120250-416200
name spots global-id
caption ID assembly stone
Table DR3b. Mineral compositions of other constituent minerals in eclogite samples pub 20200422123230-430665 major (Usui et al., 2006) 3
Table DR2. Mineral compositions of clinopyroxene in eclogite samples pub 20200422120816-470766 major (Usui et al., 2006) 5
Table DR1. Mineral compositions of garnet in eclogite samples pub 20200422115701-043327 major (Usui et al., 2006) 6
Table DR3a. Mineral compositions of lawsonite and zoisite in eclogite samples pub 20200422121841-299065 major-Lw-Zo (Usui et al.) 4
manual
  • name
  • Usui, Tomohiro
  • Nakamura, Eizo
  • Kobayashi, Katsura
  • Maruyama, Shigenori
  • Helmstaedt, Herwart