Guarnieri, Luisa et al. (2012) Petrology, Trace Element and Sr, Nd, Hf Isotope Geochemistry of the North Lanzo Peridotite Massif (Western Alps, Italy), Journal of Petrology, 53, 2259-2306, doi: 10.1093/petrology/egs049. < 20191223121936-549565 > pub

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

  • abstract:

    Field, petrographic–structural and geochemical data are reported for spinel and plagioclase peridotites from the northern domain of the Lanzo peridotite massif (Western Alps). The North Lanzo peridotites are extremely heterogeneous in terms of mineral mode, texture and chemistry. They can be referred to four major groups: (1) spinel harzburgites with coarse granular to porphyroclastic structures; (2) pyroxene-depleted spinel harzburgites recording olivine-forming or pyroxene-consuming microtextures; (3) spinel lherzolites with porphyroclastic to foliated and banded structures; (4) plagioclase-enriched spinel lherzolites. Major and trace element characterization of whole-rocks and their constituent minerals allows reconstruction of the complex series of pre- to syn-rift events this mantle sector underwent. Sr, Nd and Hf isotope data provide information on the nature of infiltrating melts and time constraints. More depleted harzburgites represent refractory protoliths that after melt extraction, possibly in the presence of residual garnet, underwent a first episode of refertilization by enriched mid-ocean ridge basalt (E-MORB)-like melts, whereas harzburgites and spinel lherzolites with ocean island basalt (OIB) signatures document the successive migration of alkaline melts. The most noticeable feature of this group of rocks is their Nd–Hf decoupling, specifically the very high 176Hf/177Hf coupled with very low 143Nd/144Nd. Lu–Hf data for these peridotites define an ∼260 Ma errorchron that is interpreted as evidence of mixing during relatively recent times between old (most probably Proterozoic) refractory subcontinental mantle and OIB-type melts. This event most probably occurred during extension (Triassic times) or during the onset of exhumation (Liassic times). Plagioclase peridotites document the last refertilization episode, involving the shallow-level impregnation of harzburgite mantle by evolved MORB melts before its sea-floor emplacement. This Middle Jurassic event caused the almost complete resetting of the original trace element and 87Sr/86Sr composition. The combination of structural, petrological and geochemical information for a north–south Lanzo traverse, from the North Massif to the South Massif, notwithstanding the effects of the alpine orogeny, allows the study of the complete evolution of a sector of old (Proterozoic?) mantle since the early stages of melt removal and allows reconstruction of the tectonic and magmatic events during continental extension leading to the opening of the Jurassic Ligurian–Piedmontese basin. North Lanzo fundamentally preserves the record of pre-syn-rift ancient episodes, whereas South Lanzo better highlights the processes that deeply modified and refertilized the older lithosphere during subsequent lithosphere extension. Slow to very slow extension led to sea-floor exposure of the subcontinental lithospheric mantle (North Lanzo) at a marginal position, close to the Adria continental margin, and of the deeply melt-modified lithospheric mantle (Lanzo South) in a more distal setting of the basin. In this respect, the Lanzo traverse is closely similar to the ocean–continent transition in slow- or ultraslow-spreading oceanic basins, such as the North Atlantic.

  • doi: 10.1093/petrology/egs049
  • modified at 6 h ago


(a) Sr isotopes_procedures of Yoshikawa and Nakamura (1993) on TIMS Thermo-Fisher MAT262
(b) Nd isotopes_procedures of Nakamura et al. (1991, 2003) on TIMS Thermo-Fisher MAT262


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) 100Mg/(Mg+Fe2+)
(c) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on Q-ICPMS Agilent 7500cs
(d) Q-ICP-MS_procedures of Lu et al. (2007) on Q-ICPMS Agilent 7500cs
(e) LA-ICP-MS on ICPMS


(a) Sr isotopes_procedures of Yoshikawa and Nakamura (1993) on TIMS Thermo-Fisher MAT262
(b) Nd isotopes_procedures of Nakamura et al. (1991, 2003) on TIMS Thermo-Fisher MAT262
Ti hr 1020979694 thumb LN71 < 20200226144140-344114 >pub
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  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 1.085
  • description: North Lanzo Peridotite Massif; spinel harzburgite
  • modified at 2020-04-13
Ti hr 977866493 thumb LN63 < 20200226144506-927058 >pub
  • place: N45°15′49.0″, E7°27′45.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 0.875
  • description: North Lanzo Peridotite Massif; spinel lherzolite
  • modified at 2020-04-13
Ti hr817781749 thumb LN62 < 20200226144454-655505 >pub
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 0.73
  • description: North Lanzo Peridotite Massif; spinel lherzolite
  • modified at 2020-04-13
Ti hr1928076295 thumb LN68 < 20200226144742-640332 >pub
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  • classification: plutonic:ultramafic
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  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr1883542636 thumb LN60 < 20200226144412-185753 >pub
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  • classification: plutonic:ultramafic
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  • quantity (kg): 1.01
  • description: North Lanzo Peridotite Massif; pyroxene-depleted spinel harzburgite
  • modified at 2020-04-13
Ti hr1117109298 thumb LN61 < 20200226144442-636579 >pub
  • place: N45°15′53.0″, E7°27′43.0″ more
  • classification: plutonic:ultramafic
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  • description: North Lanzo Peridotite Massif; spinel lherzolite
  • modified at 2020-04-13
Ti hr1399488032 thumb LN72 < 20200226144756-814087 >pub
  • place: N45°15′58.0″, E7°27′21.0″ more
  • physical-form: hand specimen
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  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr1264270252 thumb LN73 < 20200226144812-773844 >pub
  • place: N45°15′58.0″, E7°27′21.0″ more
  • classification: plutonic:ultramafic
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  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr702212447 thumb LN22 < 20200226144330-545549 >pub
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  • classification: plutonic:ultramafic
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  • description: North Lanzo Peridotite Massif; spinel harzburgite
  • modified at 2020-04-13
Ti hr283625661 thumb HA1 < 20200226144240-517441 >pub
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  • classification: plutonic:ultramafic
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  • quantity (g): 0.33
  • description: North Lanzo Peridotite Massif; spinel harzburgite
  • modified at 2020-04-13
Ti hr2102461297 thumb LN45 < 20200226144518-286726 >pub
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  • classification: plutonic:ultramafic
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  • quantity (g): 9.41
  • description: North Lanzo Peridotite Massif; spinel lherzolite
  • modified at 2020-04-13
Ti hr 1908343703 thumb LN38 < 20200226144531-475080 >pub
  • place: N45°15′47.0″, E7°27′37.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 0.53
  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr 1561607981 thumb LN54 < 20200226120129-326178 >pub
  • place: N45°15′51.0″, E7°27′32.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 0.905
  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr 981642816 thumb LN55 < 20200226144616-328046 >pub
  • place: N45°15′59.0″, E7°27′30.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 0.745
  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr981989744 thumb LN57 < 20200226144645-564840 >pub
  • place: N45°16′5.0″, E7°27′32.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 1.395
  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr 461524394 thumb LN59 < 20200226144714-612553 >pub
  • place: N45°15′59.0″, E7°27′36.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 1.625
  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr1152066696 thumb LN50 < 20200226115935-287673 >pub
  • place: N45°15′49.0″, E7°27′50.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 0.835
  • description: North Lanzo Peridotite Massif; spinel harzburgite
  • modified at 2020-04-13
Ti hr1393080883 thumb LN46 < 20200226144317-527182 >pub
  • place: N45°15′58.0″, E7°27′40.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 0.875
  • description: North Lanzo Peridotite Massif; spinel harzburgite
  • modified at 2020-04-13
Ti hr 374671244 thumb LN52 < 20200226144358-140640 >pub
  • place: N45°15′39.0″, E7°27′49.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 0.455
  • description: North Lanzo Peridotite Massif; pyroxene-depleted spinel harzburgite
  • modified at 2020-04-13
Ti hr1214587574 thumb LN56 < 20200226144628-093778 >pub
  • place: N45°16′1.0″, E7°27′35.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 1.005
  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr 601247366 thumb LN58 < 20200226144702-556759 >pub
  • place: N45°15′58.0″, E7°27′34.0″ more
  • classification: plutonic:ultramafic
  • physical-form: hand specimen
  • quantity (kg): 0.755
  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
  • modified at 2020-04-13
Ti hr1455571331 thumb HA5 < 20200226144259-551494 >pub
  • place: N45°15′52.0″, E7°27′48.0″ more
  • classification: plutonic:ultramafic
  • physical-form: powder
  • status: (unknown)
  • description: North Lanzo Peridotite Massif; spinel harzburgite
  • modified at 2020-04-13
Ti hr 518841264 thumb HA6 < 20200226144729-591193 >pub
  • place: N45°15′49.0″, E7°27′39.0″ more
  • classification: plutonic:ultramafic
  • physical-form: powder
  • quantity (g): 33.09
  • description: North Lanzo Peridotite Massif; plagioclase-enriched spinel lherzolite
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LN61 pub MC-ICP-MS Finnigan, Neptune 7 20200228110039-077705
LN62 pub MC-ICP-MS Finnigan, Neptune 7 20200228110039-321250
LN63 pub MC-ICP-MS Finnigan, Neptune 7 20200228110039-598022
LN45 pub MC-ICP-MS Finnigan, Neptune 7 20200228110039-262419
LN38 pub MC-ICP-MS Finnigan, Neptune 7 20200228110040-847940
LN54 pub MC-ICP-MS Finnigan, Neptune 7 20200228110040-823088
LN55 pub MC-ICP-MS Finnigan, Neptune 7 20200228110040-684360
LN56 pub MC-ICP-MS Finnigan, Neptune 7 20200228110040-282080
LN57 pub MC-ICP-MS Finnigan, Neptune 7 20200228110040-147326
LN58 pub MC-ICP-MS Finnigan, Neptune 7 20200228110041-407284
LN59 pub MC-ICP-MS Finnigan, Neptune 7 20200228110041-091324
HA6 pub MC-ICP-MS Finnigan, Neptune 7 20200228110041-193591
LN68 pub MC-ICP-MS Finnigan, Neptune 7 20200228110041-520820
LN72 pub MC-ICP-MS Finnigan, Neptune 7 20200228110042-308603
LN73 pub MC-ICP-MS Finnigan, Neptune 7 20200228110042-673104
LN62-Ol pub EPMA 12 20200227141558-492997
LN62-Ol_on cpx pub EPMA 12 20200227141558-811216
LN62-Spl_core pub EPMA 13 20200227141559-918322
LN38-Cpx_grain pub EPMA 12 20200227141602-843874
LN54-Cpx_core pub EPMA 12 20200227141603-861311
LN54-Opx_core pub EPMA 12 20200227141604-596296
LN54-Ol_on cpx pub EPMA 12 20200227141605-123921
LN68-Ol_on cpx pub EPMA 13 20200227141607-285495
LN68-Ol_on opx pub EPMA 13 20200227141608-134276
LN62-Cpx_core pub EPMA 12 20200227141557-394805
LN62-Ol_on opx pub EPMA 12 20200227141559-548606
LN38-Opx_core pub EPMA 12 20200227141600-990640
LN38-Ol pub EPMA 12 20200227141601-431266
LN38-Ol_on opx pub EPMA 12 20200227141601-245212
LN38-Ol_on cpx pub EPMA 12 20200227141602-435985
LN54-Ol_on opx pub EPMA 12 20200227141605-980012
LN54-Spl_core pub EPMA 13 20200227141606-738551
LN68-Cpx_rim pub EPMA 13 20200227141606-271791
LN68-Opx_core pub EPMA 13 20200227141607-845625
LN68-Ol pub EPMA 13 20200227141607-015696
LN68-Spl pub EPMA 14 20200227141608-422523
LN68-Opx_grain in gabbro pub EPMA 13 20200227141609-305033
LN62-Cpx_rim pub EPMA 12 20200227141557-931997
LN62-Opx_core pub EPMA 12 20200227141557-693884
LN62-Opx_rim pub EPMA 12 20200227141558-634553
LN38-Cpx_core pub EPMA 12 20200227141559-320569
LN38-Cpx_rim pub EPMA 12 20200227141600-115059
LN38-Opx_rim pub EPMA 12 20200227141601-209899
LN38-Spl_core pub EPMA 12 20200227141602-223284
LN38-Opx_grain pub EPMA 12 20200227141603-226946
LN38-Ol_grain pub EPMA 12 20200227141603-037027
LN54-Cpx_rim pub EPMA 12 20200227141603-260101
LN54-Opx_rim pub EPMA 12 20200227141604-320794
LN54-Ol pub EPMA 12 20200227141604-948869
LN68-Cpx_grain in gabbro pub EPMA 13 20200227141608-019379
LN62-Cpx pub ICPMS 30 20200227151522-564427
LN38-Cpx pub ICPMS 30 20200227151524-312148
LN54-Cpx pub ICPMS 30 20200227151525-915853
LN68-Cpx pub ICPMS 30 20200227151531-406694
LN71-Cpx pub ICPMS 30 20200227151512-730159
HA1-Cpx pub ICPMS 17 20200227151517-793276
HA5-Cpx pub ICPMS 17 20200227151517-275514
LN46-Cpx pub ICPMS 30 20200227151518-320208
LN52-Cpx pub ICPMS 30 20200227151520-817190
LN61-Cpx pub ICPMS 30 20200227151521-400516
LN56-Cpx pub ICPMS 29 20200227151527-207971
LN50-Cpx pub ICPMS 30 20200227151515-413953
LN60-Cpx pub ICPMS 30 20200227151520-137482
LN55-Cpx pub ICPMS 30 20200227151526-774078
LN58-Cpx pub ICPMS 30 20200227151528-287218
LN59-Cpx pub ICPMS 30 20200227151529-069079
HA6-Cpx pub ICPMS 17 20200227151530-062180
LN73-Cpx pub ICPMS 30 20200227151532-284751
LN22-Cpx pub ICPMS 17 20200227151519-545730
LN63-Cpx pub ICPMS 30 20200227151523-036128
LN45-Cpx pub ICPMS 17 20200227151524-090683
LN57-Cpx pub ICPMS 29 20200227151528-775994
LN72-Cpx pub ICPMS 29 20200227151531-841892
LN60-Cpx_core pub EPMA 12 20200227141554-870796
LN50-Cpx_core pub EPMA 12 20200227141543-190494
LN46-Cpx_core pub EPMA 13 20200227141547-769539
LN71-Cpx_core pub EPMA 13 20200227141549-887421
LN71-Cpx_rim pub EPMA 13 20200227141550-527706
LN71-Opx_core pub EPMA 13 20200227141550-051696
LN71-Ol pub EPMA 13 20200227141551-312768
LN71-Ol_on Cpx pub EPMA 13 20200227141551-666378
LN71-Ol_on Opx pub EPMA 13 20200227141552-890035
LN71-Spl_core pub EPMA 14 20200227141552-493088
LN71-Spl_in gabbro pub EPMA 14 20200227141553-513233
LN71-Cpx_in gabbro pub EPMA 13 20200227141554-594671
LN71 pub TIMS Thermo-Fisher MAT262 5 20200228102838-488793
LN71 pub TIMS Thermo-Fisher MAT262 4 20200228102822-704131
LN50 pub TIMS Thermo-Fisher MAT262 5 20200228102838-507922
LN50 pub TIMS Thermo-Fisher MAT262 4 20200228102822-149143
LN50-Cpx_rim pub EPMA 12 20200227141544-527373
LN50-Opx_core pub EPMA 12 20200227141545-211830
LN50-Opx_rim pub EPMA 12 20200227141545-704702
LN50-Ol pub EPMA 12 20200227141545-700552
LN50-Ol_on Cpx pub EPMA 12 20200227141546-094796
LN50-Ol_on Opx pub EPMA 12 20200227141546-196098
LN50-Spl_core pub EPMA 13 20200227141546-988414
HA1 pub TIMS Thermo-Fisher MAT262 5 20200228102838-273089
HA1 pub TIMS Thermo-Fisher MAT262 4 20200228102822-521652
HA5 pub TIMS Thermo-Fisher MAT262 5 20200228102839-297091
HA5 pub TIMS Thermo-Fisher MAT262 4 20200228102823-848011
LN46 pub TIMS Thermo-Fisher MAT262 5 20200228102839-159936
LN46 pub TIMS Thermo-Fisher MAT262 4 20200228102823-775906
LN46-Cpx_rim pub EPMA 13 20200227141547-928919
LN46-Opx_core pub EPMA 13 20200227141547-254611
LN46-Opx_rim pub EPMA 13 20200227141548-044267
LN46-Ol pub EPMA 13 20200227141548-115100
LN46-Ol_on Cpx pub EPMA 13 20200227141549-237575
LN46-Spl pub EPMA 14 20200227141549-560424
LN22 pub TIMS Thermo-Fisher MAT262 5 20200228102839-576338
LN22 pub TIMS Thermo-Fisher MAT262 4 20200228102823-109447
LN52 pub TIMS Thermo-Fisher MAT262 5 20200228102839-440512
LN52 pub TIMS Thermo-Fisher MAT262 4 20200228102823-773430
LN60 pub TIMS Thermo-Fisher MAT262 5 20200228102839-464618
LN60 pub TIMS Thermo-Fisher MAT262 4 20200228102823-832594
LN60-Cpx_rim pub EPMA 12 20200227141554-354474
LN60-Opx_core pub EPMA 12 20200227141555-635515
LN60-Opx_rim pub EPMA 12 20200227141555-930576
LN60-Ol pub EPMA 12 20200227141555-820856
LN60-Ol_on Cpx pub EPMA 12 20200227141556-736282
LN60-Ol_on Opx pub EPMA 12 20200227141556-318483
LN60-Spl_core pub EPMA 13 20200227141556-864062
LN61 pub TIMS Thermo-Fisher MAT262 5 20200228102839-004640
LN61 pub TIMS Thermo-Fisher MAT262 4 20200228102823-531549
LN62 pub TIMS Thermo-Fisher MAT262 5 20200228102840-111462
LN62 pub TIMS Thermo-Fisher MAT262 4 20200228102823-464892
LN63 pub TIMS Thermo-Fisher MAT262 5 20200228102840-689181
LN63 pub TIMS Thermo-Fisher MAT262 4 20200228102824-770816
LN45 pub TIMS Thermo-Fisher MAT262 5 20200228102840-187314
LN45 pub TIMS Thermo-Fisher MAT262 4 20200228102824-957477
LN38 pub TIMS Thermo-Fisher MAT262 5 20200228102840-569967
LN38 pub TIMS Thermo-Fisher MAT262 4 20200228102824-890405
LN54 pub TIMS Thermo-Fisher MAT262 5 20200228102840-744252
LN54 pub TIMS Thermo-Fisher MAT262 4 20200228102824-163169
LN55 pub TIMS Thermo-Fisher MAT262 5 20200228102841-346913
LN55 pub TIMS Thermo-Fisher MAT262 4 20200228102824-035602
LN56 pub TIMS Thermo-Fisher MAT262 5 20200228102841-883750
LN56 pub TIMS Thermo-Fisher MAT262 4 20200228102824-120804
LN57 pub TIMS Thermo-Fisher MAT262 5 20200228102841-581567
LN57 pub TIMS Thermo-Fisher MAT262 4 20200228102824-639678
LN58 pub TIMS Thermo-Fisher MAT262 5 20200228102841-497884
LN58 pub TIMS Thermo-Fisher MAT262 4 20200228102824-060674
LN59 pub TIMS Thermo-Fisher MAT262 5 20200228102841-828227
LN59 pub TIMS Thermo-Fisher MAT262 4 20200228102825-127954
HA6 pub TIMS Thermo-Fisher MAT262 5 20200228102841-537316
HA6 pub TIMS Thermo-Fisher MAT262 4 20200228102825-359292
LN68 pub TIMS Thermo-Fisher MAT262 5 20200228102841-254304
LN68 pub TIMS Thermo-Fisher MAT262 4 20200228102825-675908
LN72 pub TIMS Thermo-Fisher MAT262 5 20200228102842-638783
LN72 pub TIMS Thermo-Fisher MAT262 4 20200228102825-999766
LN73 pub TIMS Thermo-Fisher MAT262 5 20200228102842-335178
LN73 pub TIMS Thermo-Fisher MAT262 4 20200228102825-449421
name spots global-id
caption ID assembly stone
Table 5. Sr, Nd isotopic compositions and Rb, Sr, Sm, Nd concentrations for the North Lanzo peridotites (leached whole-rock samples) pub 20200228093958-363890 Sr-Nd isotopes (Luisa et al., 2012) 23
Table 3b. Representative major element compositions of minerals forming the lherzolite pub 20200227143133-354000 major-min (Luisa et al., 2012) 35
Table 4 Trace element compositions of clinopyroxene from the North Lanzo peridotites (ppm) pub 20200227152216-634254 trace-Cpx (Luisa et al., 2012) 23
Table 1 The modal compositions of the North Lanzo peridotites pub 20200227103804-702764 mode (Luisa et al., 2012) 23
Table 3a. Representative major element compositions of minerals forming the harzburgite pub 20200227142244-421236 major-min (Luisa et al., 2012) 32
Table 7 Hf isotopic composition and Lu, Hf concentrations for the North Lanzo peridotites (leached whole-rock) pub 20200228111016-234323 Hf is (Luisa et al., 2012) 23
Table 2 Whole-rock major and trace element compositions of the North Lanzo peridotites pub 20200227110814-853924 major-trace (Luisa et al., 2012) 23
Table 6 Sr, Nd isotopic compositions and Rb, Sr, Sm, Nd concentrations for leached clinopyroxene separates from the North Lanzo peridotites pub 20200228102515-356739 Sr-Nd isotopes (Luisa et al., 2012) 23
manual
  • name
  • Guarnieri, Luisa
  • Nakamura, Eizo
  • Piccardo, Giovanni B.
  • Sakaguchi, C.
  • Shimizu, N.
  • Vannucci, Riccardo
  • Zanetti, Alberto