Rehman, Hafiz Ur et al. (2013) Ion microprobe U–Th–Pb geochronology and study of micro-inclusions in zircon from the Himalayan high- and ultrahigh-pressure eclogites, Kaghan Valley of Pakistan, Journal of Asian Earth Sciences, 63, 179-196, doi: 10.1016/j.jseaes.2012.04.025. < 20200117121706-799971 > pub

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

  • abstract:

    We report ion microprobe U–Th–Pb geochronology of in situ zircon from the Himalayan high- and ultrahigh-pressure eclogites, Kaghan Valley of Pakistan. Combined with the textural features, mineral inclusions, cathodoluminescence image information and the U–Th–Pb isotope geochronology, two types of zircons were recognized in Group I and II eclogites. Zircons in Group I eclogites are of considerably large size (>100 μm up to 500 μm). A few grains are euhederal and prismatic, show oscillatory zoning with distinct core–rim luminescence pattern. Several other grains show irregular morphology, mitamictization, embayment and boundary truncations. They contain micro-inclusions such as muscovite, biotite, quartz and albite. Core or middle portions of zircons from Group I eclogites yielded concordant U–Th–Pb age of 267.6 ± 2.4 Ma (MSWD = 8.5), have higher U and Th contents with a Th/U ratio > 1, indicating typical magmatic core domains. Middle and rim or outer portions of these zircons contain inclusions of garnet, omphacite, phengite and these portions show no clear zonation. They yielded discordant values ranging between 210 and 71 Ma, indicating several thermal or Pb-loss events during their growth and recrystalization prior to or during the Himalayan eclogite-facies metamorphism. Zircons in Group II eclogites are smaller in size, prismatic to oval, display patchy or sector zoning and contain abundant inclusions of garnet, omphacite, phengite, quartz, rutile and carbonates. They yielded concordant U–Th–Pb age of 44.9 ± 1.2 Ma (MSWD = 4.9). The lower U and Th contents and a lower Th/U ratio (<0.05) in these zircons suggest their formation from the recrystallization of the older zircons during the Himalayan high and ultrahigh-pressure eclogite-facies metamorphism.

  • doi: 10.1016/j.jseaes.2012.04.025
  • modified at 17 h ago
Ph380a thumb Ph380A < 20090819104439525.tota >pub
  • classification: metamorphic
  • physical-form: thin section
  • status: (unknown)
  • description: Collected from Pakistan by Hafiz 2001. Higher Himalayan Crystalline (HHC); Northwest of Lulusar; HP eclogite
  • modified at 2020-04-01
Ph423 thumb Ph423 < 20090819104518291.tota >pub
  • classification: metamorphic
  • physical-form: thin section
  • status: (unknown)
  • description: Collected from Pakistan by Hafiz 2001. Higher Himalayan Crystalline (HHC); West of Gittidas; UHP eclogite
  • modified at 2020-04-01
Ph380b thumb Ph380B < 20090819104446368.tota >pub
  • classification: metamorphic
  • physical-form: thin section
  • status: (unknown)
  • description: Collected from Pakistan by Hafiz 2001. Higher Himalayan Crystalline (HHC); Northwest of Lulusar; HP eclogite
  • modified at 2020-04-01
Ph380d thumb Ph380D < 20090819104453249.tota >pub
  • classification: metamorphic
  • physical-form: thin section
  • status: (unknown)
  • description: Collected from Pakistan by Hafiz 2001. Higher Himalayan Crystalline (HHC); Northwest of Lulusar; HP eclogite
  • modified at 2020-04-01
Ph425 thumb Ph425 < 20090819131132973.tota >pub
  • classification: metamorphic
  • physical-form: thin section
  • status: (unknown)
  • description: Collected from Pakistan by Hafiz 2001. Higher Himalayan Crystalline (HHC); West of Gittidas; UHP eclogite
  • modified at 2020-04-01
Ph422b thumb Ph422B < 20090819104504034.tota >pub
  • classification: metamorphic
  • physical-form: thin section
  • status: (unknown)
  • description: Collected from Pakistan by Hafiz 2001. Higher Himalayan Crystalline (HHC); West of Gittidas; UHP eclogite
  • modified at 2020-04-01
Img 5242@ca37a4298e726b8d9c41895 thumb mount B-zrn-Hafiz < 20120214095055-424-645 >pub
  • classification: mineral:zircon
  • physical-form: grain
  • status: (unknown)
  • description: Zircons from Group II eclogites - samples Ph423, Ph425
  • modified at 2020-04-01
Img 5241@0e90f5d883053d2b4c46a57 thumb mount A-zrn-Hafiz < 20120214095038-874-707 >pub
  • classification: mineral:zircon
  • physical-form: grain
  • status: (unknown)
  • description: Zircons from Group II eclogites - samples Ph422, Ph423, Ph425
  • modified at 2020-04-01
Img 5243@8960d5fd453bf77620e3a33 thumb PH422A < 20120214095107-086-346 >pub
  • physical-form: grain
  • status: (unknown)
  • description: Higher Himalayan Crystalline (HHC); West of Gittidas; UHP eclogite
  • modified at 2020-01-17
name box-type global-id
binder of Ion microprobe U–Th–Pb geochronology and study of micro-inclusions in zircon from the Himalayan high- and ultrahigh-pressure eclogites, Kaghan Valley of Pakistan pub container 20200117121726-461012
name device size global-id
Ph380D-Omp115 pub EPMA JEOL JXA-8800R 10 20200117145943-738934
B-Ph425-Zrn16_84 pub EPMA JEOL JXA-8800R 11 20200117145946-111626
Ph423-Matrix_Cpx2_122 pub EPMA JEOL JXA-8800R 11 20200117145947-118167
Ph380A-Omp19 pub EPMA JEOL JXA-8800R 8 20200117145941-768528
Ph380B-Omp12 pub EPMA JEOL JXA-8800R 10 20200117145942-440736
Ph380B-Omp16 pub EPMA JEOL JXA-8800R 9 20200117145942-344561
Ph380B-Omp27 pub EPMA JEOL JXA-8800R 10 20200117145942-846937
Ph380D-Omp11 pub EPMA JEOL JXA-8800R 9 20200117145943-411308
Ph380D-Omp117 pub EPMA JEOL JXA-8800R 12 20200117145944-833603
Ph380D-Omp118 pub EPMA JEOL JXA-8800R 11 20200117145945-139225
PH422A-Zrn1_19 pub EPMA JEOL JXA-8800R 10 20200117145945-021300
B-Ph425-Zrn31_93 pub EPMA JEOL JXA-8800R 10 20200117145946-277705
Ph423-Matrix_Cpx2_106 pub EPMA JEOL JXA-8800R 11 20200117145947-010746
Ph380A-Omp46 pub EPMA JEOL JXA-8800R 9 20200117145941-286652
Ph380B-Omp28 pub EPMA JEOL JXA-8800R 9 20200117145942-259732
Ph380D-Omp116 pub EPMA JEOL JXA-8800R 11 20200117145944-207651
PH422A-Zrn1_18 pub EPMA JEOL JXA-8800R 10 20200117145945-861364
B-Ph425-Zrn12_69 pub EPMA JEOL JXA-8800R 10 20200117145945-754547
B-Ph425-Zrn19_85 pub EPMA JEOL JXA-8800R 9 20200117145946-007817
B-Ph425-Zrn4_65 pub EPMA JEOL JXA-8800R 8 20200117145946-617595
Ph423-Matrix_Cpx2_105 pub EPMA JEOL JXA-8800R 11 20200117145947-681914
Ph423-Matrix_Cpx2_124 pub EPMA JEOL JXA-8800R 10 20200117145948-372767
Ph380D-Grt1 pub EPMA JEOL JXA-8800R 9 20200117154924-865946
Ph380D-Grt32 pub EPMA JEOL JXA-8800R 9 20200117154924-310832
Ph423-Zr19-25 pub EPMA JEOL JXA-8800R 10 20200117154926-419230
Ph425-Zrn4-77 pub EPMA JEOL JXA-8800R 8 20200117154927-742010
Ph423-Grt1_14 pub EPMA JEOL JXA-8800R 9 20200117154927-685650
Ph423-Grt1_17 pub EPMA JEOL JXA-8800R 10 20200117154928-860677
Ph423-Grt2_54 pub EPMA JEOL JXA-8800R 10 20200117154928-149000
Ph380D-Grt1-7 pub EPMA JEOL JXA-8800R 10 20200117154924-520639
Ph380D-Grt1-3 pub EPMA JEOL JXA-8800R 10 20200117154924-421825
Ph380D-Grt1-8 pub EPMA JEOL JXA-8800R 10 20200117154925-690334
Ph380D-Grt1-12 pub EPMA JEOL JXA-8800R 10 20200117154925-451796
Ph423-Zr19-23 pub EPMA JEOL JXA-8800R 10 20200117154925-760255
Ph425-Zrn23-63 pub EPMA JEOL JXA-8800R 9 20200117154927-334628
Ph425-Zrn15-89 pub EPMA JEOL JXA-8800R 9 20200117154927-941580
Ph423-Zr19-24 pub EPMA JEOL JXA-8800R 10 20200117154925-308064
Ph423-Zr19-29 pub EPMA JEOL JXA-8800R 10 20200117154926-111839
Ph425-Zrn2-76 pub EPMA JEOL JXA-8800R 9 20200117154926-991832
Ph423-Grt1_24 pub EPMA JEOL JXA-8800R 10 20200117154928-767129
Ph423-Grt2_64 pub EPMA JEOL JXA-8800R 10 20200117154928-767865
Ph380A-Zr3@2_center pub SIMS Cameca ims-1270 7 20200120101133-024396
Ph380B-Zr1@6_center pub SIMS Cameca ims-1270 7 20200120101135-138255
Ph380D-Zr1@1_core pub SIMS Cameca ims-1270 7 20200120101136-181298
Ph380D-Zr1@2_core pub SIMS Cameca ims-1270 7 20200120101137-388770
Ph380D-Zr1@4_core pub SIMS Cameca ims-1270 7 20200120101138-953317
Ph380D-Zr7@1_core pub SIMS Cameca ims-1270 7 20200120101138-252870
Ph380D-Zr8@1_rim pub SIMS Cameca ims-1270 7 20200120101138-252642
Ph380D-Zr12@2_rim pub SIMS Cameca ims-1270 7 20200120101140-418387
Ph380D-Zr13@1_center pub SIMS Cameca ims-1270 7 20200120101140-116807
Ph380D-Zr13@2_rim pub SIMS Cameca ims-1270 7 20200120101140-141419
Ph380D-Zr14@1_core pub SIMS Cameca ims-1270 7 20200120101141-846886
A_Ph423_10@03_center pub SIMS Cameca ims-1270 7 20200120101143-548797
A_Ph425_02@05_center pub SIMS Cameca ims-1270 7 20200120101143-449542
A_Ph425_11@14_rim pub SIMS Cameca ims-1270 7 20200120101146-876138
A_Ph425_11@15_center pub SIMS Cameca ims-1270 7 20200120101146-630148
B_Ph425_17@02_center pub SIMS Cameca ims-1270 7 20200120101149-561633
B_Ph425_02@06_center pub SIMS Cameca ims-1270 7 20200120101150-461126
B_Ph425_04@07_center pub SIMS Cameca ims-1270 7 20200120101150-271014
B_Ph425_06@09_center pub SIMS Cameca ims-1270 7 20200120101150-638008
B_Ph425_08@11_center pub SIMS Cameca ims-1270 7 20200120101151-071586
B_Ph425_18@14_center pub SIMS Cameca ims-1270 7 20200120101152-637916
B_Ph422_07@23_center pub SIMS Cameca ims-1270 7 20200120101154-209993
Ph380A-Zr3@1_core pub SIMS Cameca ims-1270 7 20200120101133-968779
Ph380A-Zr5@1_core pub SIMS Cameca ims-1270 7 20200120101134-694640
Ph380B-Zr1@2_core pub SIMS Cameca ims-1270 7 20200120101134-311848
Ph380B-Zr3@1_rim pub SIMS Cameca ims-1270 7 20200120101136-430850
Ph380D-Zr16@1_center pub SIMS Cameca ims-1270 7 20200120101141-287909
Ph380D-Zr17@1_rim pub SIMS Cameca ims-1270 7 20200120101141-853156
A_Ph423_07@02_rim pub SIMS Cameca ims-1270 7 20200120101143-068485
A_Ph423_15@04_center pub SIMS Cameca ims-1270 7 20200120101143-656295
A_Ph425_03@07_center pub SIMS Cameca ims-1270 7 20200120101144-221835
A_Ph425_03@08_center pub SIMS Cameca ims-1270 7 20200120101144-325024
A_Ph425_03@09_rim pub SIMS Cameca ims-1270 7 20200120101144-987439
A_Ph425_05@10 pub SIMS Cameca ims-1270 7 20200120101145-206732
A_Ph425_06@12 pub SIMS Cameca ims-1270 7 20200120101145-700160
A_Ph425_19@17_center pub SIMS Cameca ims-1270 7 20200120101147-685284
A_Ph425_20@18_center pub SIMS Cameca ims-1270 7 20200120101147-315965
A_Ph425_24@19_center pub SIMS Cameca ims-1270 7 20200120101147-739649
A_Ph425_26@21_center pub SIMS Cameca ims-1270 7 20200120101148-799148
B_Ph425_19@01_center pub SIMS Cameca ims-1270 7 20200120101149-660775
Ph380A-Zr3@3_rim pub SIMS Cameca ims-1270 7 20200120101133-049924
Ph380B-Zr1@1_core pub SIMS Cameca ims-1270 7 20200120101134-438975
Ph380B-Zr1@3_rim pub SIMS Cameca ims-1270 7 20200120101135-667816
Ph380B-Zr1@5_core pub SIMS Cameca ims-1270 7 20200120101135-801666
Ph380D-Zr1@3_core pub SIMS Cameca ims-1270 7 20200120101137-482758
Ph380D-Zr1@5_rim pub SIMS Cameca ims-1270 7 20200120101138-416584
Ph380D-Zr8@2_center pub SIMS Cameca ims-1270 7 20200120101139-621791
Ph380D-Zr8@3_rim pub SIMS Cameca ims-1270 7 20200120101139-651402
A_Ph423_07@01_center pub SIMS Cameca ims-1270 7 20200120101142-511319
Ph380D-Zr19@1_core pub SIMS Cameca ims-1270 7 20200120101142-494349
A_Ph425_06@11 pub SIMS Cameca ims-1270 7 20200120101145-579281
A_Ph425_24@20_rim pub SIMS Cameca ims-1270 7 20200120101148-424508
B_Ph425_16@03_center pub SIMS Cameca ims-1270 7 20200120101150-309317
B_Ph422_02@20_center pub SIMS Cameca ims-1270 7 20200120101153-876258
B_Ph422_05@21_center pub SIMS Cameca ims-1270 7 20200120101153-621664
B_Ph422_06@22_center pub SIMS Cameca ims-1270 7 20200120101153-323962
B_Ph425_14@04_center pub SIMS Cameca ims-1270 7 20200120101150-412779
B_Ph425_07@10_center pub SIMS Cameca ims-1270 7 20200120101151-986777
B_Ph425_11@13_center pub SIMS Cameca ims-1270 7 20200120101151-701751
B_Ph425_26@15_center pub SIMS Cameca ims-1270 7 20200120101152-481049
B_Ph423_18@16_center pub SIMS Cameca ims-1270 7 20200120101152-511835
B_Ph422_01@19_center pub SIMS Cameca ims-1270 7 20200120101153-839410
name spots global-id
caption ID assembly stone
Table 2. Chemical composition of clinopyroxene in eclogite matrix and as inclusions in zircons. pub 20200117150351-457740 major_min (Rehman et al., 2013) 22
Table 3. Chemical composition of garnet in eclogite matrix and as inclusions in zircons. pub 20200117155208-091066 major_min_1 (Rehman et al., 2013) 19
Table 4. HR-SIMS Cameca-ims 1270 in situ zircon U–Th–Pb data of the Himalayan HP and UHP eclogites pub 20200120101519-681217 U-series (Rehman et al., 2013) 62
manual
  • name
  • Rehman, Hafiz Ur
  • Kobayashi, Katsura
  • Tsujimori, Tatsuki
  • Ota, Tsutomu
  • Yamamoto, Hiroshi
  • Nakamura, Eizo
  • Kaneko, Yoshiyuki
  • Khan, Tahseenullah
  • Terabayashi, Masaru
  • Yoshida, Kenta
  • Hirajima, Takao