Usui, Tomohiro et al. (2006) Petrology and Geochemistry of Eclogite Xenoliths form the Colorado Plateau: Implications for the Evolution of subducted Oceanic Crust, Journal of Petrology, 47, 929-964, doi: 10.1093/petrology/egi101. < 20191017100324-652021 > pub

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

  • abstract:

    Eclogite xenoliths from the Colorado Plateau, interpreted as fragments of the subducted Farallon plate, are used to constrain the trace element and Sr–Nd–Pb isotopic compositions of oceanic crust subducted into the upper mantle. The xenoliths consist of almandine-rich garnet, Na-clinopyroxene, lawsonite and zoisite with minor amounts of phengite, rutile, pyrite and zircon. They have essentially basaltic bulk-rock major element compositions; their Na2O contents are significantly elevated, but K2O contents are similar to those of unaltered mid-ocean ridge basalt (MORB). These alkali element characteristics are explained by spilitization or albitization processes on the sea floor and during subduction-zone metasomatism in the fore-arc region. The whole-rock trace element abundances of the xenoliths are variable relative to sea-floor-altered MORB, except for the restricted Zr/Hf ratios (36.9–37.6). Whole-rock mass balances for two Colorado Plateau eclogite xenoliths are examined for 22 trace elements, Rb, Cs, Sr, Ba, Y, rare earth elements, Pb, Th and U. Mass balance considerations and mineralogical observations indicate that the whole-rock chemistries of the xenoliths were modified by near-surface processes after emplacement and limited interaction with their host rock, a serpentinized ultramafic microbreccia. To avoid these secondary effects, the Sr, Nd and Pb isotopic compositions of minerals separated from the xenoliths were measured, yielding 0.70453–0.70590 for 87Sr/86Sr, −3.1 to 0.5 for εNd and 18.928–19.063 for 206Pb/204Pb. These isotopic compositions are distinctly more radiogenic for Sr and Pb and less radiogenic for Nd than those of altered MORB. Our results suggest that the MORB-like protolith of the xenoliths was metasomatized by a fluid equilibrated with sediment in the fore-arc region of a subduction zone and that this metasomatic fluid produced continental crust-like isotopic compositions of the xenoliths.

  • doi: 10.1093/petrology/egi101
  • modified at 16 h ago


(a) Sr isotopes_procedures of Yoshikawa and Nakamura (1993) on TIMS Thermo-Fisher MAT261/262
(b) Nd isotopes_procedures of Nakamura et al. (1991, 2003) on TIMS Thermo-Fisher MAT261/262
(c) Pb isotopes_procedures of Kuritani and Nakamura (2002, 2003) on TIMS Thermo-Fisher MAT261/262


(a) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on ICPMS Yokogawa PMS2000


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on ICPMS Yokogawa PMS2000
(c) Sr isotopes_procedures of Yoshikawa and Nakamura (1993) on TIMS Thermo-Fisher MAT261/262
(d) Nd isotopes_procedures of Nakamura et al. (1991, 2003) on TIMS Thermo-Fisher MAT261/262
(e) Pb isotopes_procedures of Kuritani and Nakamura (2002, 2003) on TIMS Thermo-Fisher MAT261/262


(a) Sr isotopes_procedures of Yoshikawa and Nakamura (1993) on TIMS Thermo-Fisher MAT261/262
(b) Nd isotopes_procedures of Nakamura et al. (1991, 2003) on TIMS Thermo-Fisher MAT261/262
(c) Pb isotopes_procedures of Kuritani and Nakamura (2002, 2003) on TIMS Thermo-Fisher MAT261/262
GR-1-010 < 20150902133342-797958 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau lawsonite-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-7 < 20150902133514-295338 >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
MR-19 < 20150902133531-146158 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau zoisite-eclogite
  • modified at 2020-04-21
MR-26 < 20150902133557-279096 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau jadeitic-clinopyroxenite
  • modified at 2020-04-21
MR-21 < 20150902133541-638330 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau jadeitic-clinopyroxenite
  • modified at 2020-04-21
MR-3B < 20150902133404-008793 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau jadeitic-clinopyroxenite
  • modified at 2020-04-21
MR-47 < 20150902133901-410793 >pub
  • classification: xenolithic
  • physical-form: on mount
  • status: (unknown)
  • description: Colorado Plateau jadeitic-clinopyroxenite
  • modified at 2020-04-21
Img 4927 thumb MR-15 < 20140307085221-137827 >pub
  • IGSN: IEDRM00XN
  • classification: xenolithic
  • physical-form: powder
  • quantity (g): 6.91
  • description: Colorado Plateau zoisite-eclogite
  • modified at 2020-04-22
Img 4928 thumb MR-19 < 20140307085229-858282 >pub
  • IGSN: IEDRM00XO
  • classification: xenolithic
  • physical-form: powder
  • quantity (g): 3.07
  • description: Colorado Plateau zoisite-eclogite
  • modified at 2020-04-22
Img 4933 thumb MR-49 < 20140307085310-068969 >pub
  • IGSN: IEDRM00XP
  • classification: xenolithic
  • physical-form: powder
  • quantity (g): 2.08
  • description: Colorado Plateau zoisite-eclogite
  • modified at 2020-04-22
Img 4931 thumb MR-29 < 20140307085254-272784 >pub
  • IGSN: IEDRM00XQ
  • classification: xenolithic
  • physical-form: powder
  • quantity (g): 1.51
  • description: Colorado Plateau zoisite-eclogite
  • modified at 2020-04-22
Img 4930 thumb MR-26 < 20140307085245-628640 >pub
  • IGSN: IEDRM00XR
  • classification: xenolithic
  • physical-form: powder
  • quantity (g): 2.46
  • description: Colorado Plateau jadeitic-clinopyroxenite
  • modified at 2020-04-21
Img 4929 thumb MR-21 < 20140307085238-813906 >pub
  • IGSN: IEDRM00XS
  • classification: xenolithic
  • physical-form: powder
  • quantity (g): 1.77
  • description: Colorado Plateau jadeitic-clinopyroxenite
  • modified at 2020-04-22
Img 4934 thumb MR-50 < 20140307085319-333185 >pub
  • IGSN: IEDRM00XT
  • classification: xenolithic
  • physical-form: powder
  • quantity (g): 3.8
  • description: Colorado Plateau jadeitic-clinopyroxenite
  • modified at 2020-04-22
Img 4932 thumb MR-47 < 20140307085302-952341 >pub
  • IGSN: IEDRM00XU
  • classification: xenolithic
  • physical-form: powder
  • quantity (g): 0.62
  • description: Colorado Plateau jadeitic-clinopyroxenite
  • modified at 2020-04-22
name box-type global-id
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Cpx3 pub SIMS Cameca ims-5f 16 20191023093820-432449
Cpx5 pub SIMS Cameca ims-5f 15 20191023093822-847934
Cpx4 pub EPMA JEOL JXA-8800R 10 20191023093802-837694
Cpx1_core pub EPMA JEOL JXA-8800R 11 20191023093801-680512
Cpx8_rim pub EPMA JEOL JXA-8800R 10 20191023093804-374008
Cpx2 pub SIMS Cameca ims-5f 16 20191023093819-955633
Cpx8_rim pub SIMS Cameca ims-5f 15 20191023093823-612743
Cpx4 pub SIMS Cameca ims-5f 16 20191023093821-896487
Lws4_matrix pub EPMA JEOL JXA-8800R 11 20191023101327-996430
Lws1_matrix pub EPMA JEOL JXA-8800R 10 20191023101326-795203
Lws7_matrix pub EPMA JEOL JXA-8800R 9 20191023101329-394615
Lws3_matrix pub EPMA JEOL JXA-8800R 11 20191023101327-258398
Lws6_matrix pub EPMA JEOL JXA-8800R 8 20191023101328-339636
Lws_matrix pub EPMA JEOL JXA-8800R 8 20191023101329-013261
Lws5_matrix pub EPMA JEOL JXA-8800R 11 20191023101328-588524
Lws2_matrix pub EPMA JEOL JXA-8800R 8 20191023101326-346797
Lws8_inclusion pub EPMA JEOL JXA-8800R 10 20191023101330-732466
Lws9_inclusion pub EPMA JEOL JXA-8800R 10 20191023101331-073235
Lws10_inclusion pub EPMA JEOL JXA-8800R 10 20191023101331-421958
Lws11_inclusion pub EPMA JEOL JXA-8800R 10 20191023101331-323910
Lws12_inclusion pub EPMA JEOL JXA-8800R 11 20191023101332-744103
Lws1_matrix pub SIMS Cameca ims-5f 16 20191023101345-856307
Lws2_matrix pub SIMS Cameca ims-5f 16 20191023101346-673247
Lws3_matrix pub SIMS Cameca ims-5f 16 20191023101346-078865
Lws4_matrix pub SIMS Cameca ims-5f 16 20191023101347-884209
Lws5_matrix pub SIMS Cameca ims-5f 16 20191023101348-790255
Lws6_matrix pub SIMS Cameca ims-5f 16 20191023101348-253022
Lws7_matrix pub SIMS Cameca ims-5f 16 20191023101349-124196
Lws_matrix pub SIMS Cameca ims-5f 16 20191023101350-246696
Lws8_inclusion pub SIMS Cameca ims-5f 16 20191023101351-098013
Lws9_inclusion pub SIMS Cameca ims-5f 16 20191023101352-792524
Lws10_inclusion pub SIMS Cameca ims-5f 16 20191023101352-464321
Lws11_inclusion pub SIMS Cameca ims-5f 16 20191023101353-145961
Lws12_inclusion pub SIMS Cameca ims-5f 16 20191023101354-532186
Grt4 pub EPMA JEOL JXA-8800R 9 20191021155341-031626
Grt6 pub EPMA JEOL JXA-8800R 10 20191021155342-837130
Grt2 pub EPMA JEOL JXA-8800R 10 20191021155341-241636
Grt3 pub EPMA JEOL JXA-8800R 11 20191021155341-230601
Grt5 pub EPMA JEOL JXA-8800R 10 20191021155342-413024
Grt7 pub EPMA JEOL JXA-8800R 10 20191021155342-267071
Grt8 pub EPMA JEOL JXA-8800R 10 20191021155342-767352
Grt9 pub EPMA JEOL JXA-8800R 9 20191021155343-551182
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
Grt15 pub EPMA JEOL JXA-8800R 10 20191021155345-833338
Grt16 pub EPMA JEOL JXA-8800R 10 20191021155345-462773
Grt17 pub EPMA JEOL JXA-8800R 10 20191021155345-253463
GR1_Lw_inclusion_2003 pub EPMA JEOL JXA-8800R 12 20200422122908-903706
MR-7_Cpx_matrix_2003 pub EPMA JEOL JXA-8800R 12 20200422120633-018278
MR-7_Cpx_inclusion_2003 pub EPMA JEOL JXA-8800R 12 20200422120634-284389
MR-3B_Phen_matrix pub EPMA JEOL JXA-8800R 12 20200422122909-125155
name spots global-id
caption ID assembly stone
Table 8: Representative ion microprobe trace element analyses of clinopyroxene (ppm) pub 20191017152208-628083 trace (Usui et al., 2006) 6
Table 3: Representative electron microprobe analyses of garnet pub 20191017120016-293482 major (Usui et al., 2006) 14
Table 9: Representative ion microprobe analyses of trace elements in lawsonite and zoisite (ppm) pub 20191017152936-127215 trace (Usui et al., 2006) 6
Table 2: Modal proportions (vol. %) in the Colorado Plateau xenoliths pub 20191017105711-434192 mode (Usui et al., 2006) 12
Table 4: Representative electron microprobe analyses of clinopyroxene pub 20191017141324-427843 major (Usui et al., 2006) 10
Table 12: Sr, Nd and Pb isotopic compositions of whole-rock samples pub 20191018113517-774461 Sr-Nd-Pb-isotopes (Usui et al., 2006) 8
Table 10: Trace element compositions of separated minerals measured by ICP-MS pub 20191017155544-261788 trace_min (Usui et al., 2006) 9
Table 11: Major and trace element compositions of whole-rock samples pub 20191018095649-817037 major-trace (Usui et al., 2015) 8
Table 13: Sr, Nd and Pb isotopic compositions of minerals pub 20191018120408-862651 Sr-Nd-Pb-isotopes (Usui et al., 2006) 14
Table 7: Representative ion microprobe trace element analyses of garnet (ppm) pub 20191017151012-808817 trace (Usui et al., 2006) 17
Table 5: Representative electron microprobe analyses of lawsonite and zoisite pub 20191017142525-828315 major-Lw-Zo (Usui et al.) 8
Table 6: Representative electron microprobe analyses of other constituent minerals pub 20191017143633-396972 major (Usui et al., 2006) 6
manual
  • name
  • Usui, Tomohiro
  • Nakamura, E.
  • Helmstaedt, Herwart