Petrogenesis of heterogeneous mantle peridotites with Ni-rich olivine from the Pujada Ophiolite, Philippines
Nickel (Ni) enrichment (>0.40 wt%) in olivine was previously recognized in mantle xenoliths and volcanic rocks. Though this enrichment is often attributed to subarc metasomatic processes, the occurrence of Ni rich olivines in mantle peridotites remains to be established. We found peridotites that...
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ftdoajarticles:oai:doaj.org/article:20ec05b915e94b0f82a9dbeb096d9cb7 2023-05-15T16:59:19+02:00 Petrogenesis of heterogeneous mantle peridotites with Ni-rich olivine from the Pujada Ophiolite, Philippines Valerie Shayne V. Olfindo Betchaida D. Payot Gabriel Theophilus V. Valera Shoji Arai 2020-12-01T00:00:00Z https://doi.org/10.1016/j.jaesx.2020.100039 https://doaj.org/article/20ec05b915e94b0f82a9dbeb096d9cb7 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2590056020300153 https://doaj.org/toc/2590-0560 2590-0560 doi:10.1016/j.jaesx.2020.100039 https://doaj.org/article/20ec05b915e94b0f82a9dbeb096d9cb7 Journal of Asian Earth Sciences: X, Vol 4, Iss , Pp 100039- (2020) Pujada ophiolite Peridotites Ni-rich olivine Philippines Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.1016/j.jaesx.2020.100039 2022-12-31T06:14:23Z Nickel (Ni) enrichment (>0.40 wt%) in olivine was previously recognized in mantle xenoliths and volcanic rocks. Though this enrichment is often attributed to subarc metasomatic processes, the occurrence of Ni rich olivines in mantle peridotites remains to be established. We found peridotites that randomly contain unusually high-Ni olivines (up to Ni = 0.53 wt%) from the mantle section of the Pujada Ophiolite, Philippines. The Pujada mantle peridotites can be classified into three groups based on their occurrence and spinel Cr#: Group I - massive lherzolites and harzburgites with Cr# = 0.10–0.40, Group II - lherzolite-dunite and harzburgite-dunite interlayers with Cr# = 0.10–0.40, and Group III - interlayered harzburgites and dunites with Cr# >0.40. Rare earth element composition of clinopyroxenes shows general light rare earth element (LREE) depletion and relatively flat heavy rare earth element (HREE) with minor LREE enrichment. The high-Ni olivines are associated to the occurrence of secondary orthopyroxenes, high modal abundance of orthopyroxenes (>30%) and LREE enrichment. The Ni enrichment in olivine is the result of the diffusion of Ni from a pyroxenitic melt. The crystallization of a hybridized melt formed by the combination of pyroxenite melt, primitive MORB melt and siliceous slab-derived melt, shows the same case of formation for the high Ni-olivine phenocrysts in alkali basalts from Hawaii, Kamchatka and the Mexican Volcanic Belt. Article in Journal/Newspaper Kamchatka Directory of Open Access Journals: DOAJ Articles Journal of Asian Earth Sciences: X 4 100039 |
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language |
English |
topic |
Pujada ophiolite Peridotites Ni-rich olivine Philippines Geology QE1-996.5 |
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Pujada ophiolite Peridotites Ni-rich olivine Philippines Geology QE1-996.5 Valerie Shayne V. Olfindo Betchaida D. Payot Gabriel Theophilus V. Valera Shoji Arai Petrogenesis of heterogeneous mantle peridotites with Ni-rich olivine from the Pujada Ophiolite, Philippines |
topic_facet |
Pujada ophiolite Peridotites Ni-rich olivine Philippines Geology QE1-996.5 |
description |
Nickel (Ni) enrichment (>0.40 wt%) in olivine was previously recognized in mantle xenoliths and volcanic rocks. Though this enrichment is often attributed to subarc metasomatic processes, the occurrence of Ni rich olivines in mantle peridotites remains to be established. We found peridotites that randomly contain unusually high-Ni olivines (up to Ni = 0.53 wt%) from the mantle section of the Pujada Ophiolite, Philippines. The Pujada mantle peridotites can be classified into three groups based on their occurrence and spinel Cr#: Group I - massive lherzolites and harzburgites with Cr# = 0.10–0.40, Group II - lherzolite-dunite and harzburgite-dunite interlayers with Cr# = 0.10–0.40, and Group III - interlayered harzburgites and dunites with Cr# >0.40. Rare earth element composition of clinopyroxenes shows general light rare earth element (LREE) depletion and relatively flat heavy rare earth element (HREE) with minor LREE enrichment. The high-Ni olivines are associated to the occurrence of secondary orthopyroxenes, high modal abundance of orthopyroxenes (>30%) and LREE enrichment. The Ni enrichment in olivine is the result of the diffusion of Ni from a pyroxenitic melt. The crystallization of a hybridized melt formed by the combination of pyroxenite melt, primitive MORB melt and siliceous slab-derived melt, shows the same case of formation for the high Ni-olivine phenocrysts in alkali basalts from Hawaii, Kamchatka and the Mexican Volcanic Belt. |
format |
Article in Journal/Newspaper |
author |
Valerie Shayne V. Olfindo Betchaida D. Payot Gabriel Theophilus V. Valera Shoji Arai |
author_facet |
Valerie Shayne V. Olfindo Betchaida D. Payot Gabriel Theophilus V. Valera Shoji Arai |
author_sort |
Valerie Shayne V. Olfindo |
title |
Petrogenesis of heterogeneous mantle peridotites with Ni-rich olivine from the Pujada Ophiolite, Philippines |
title_short |
Petrogenesis of heterogeneous mantle peridotites with Ni-rich olivine from the Pujada Ophiolite, Philippines |
title_full |
Petrogenesis of heterogeneous mantle peridotites with Ni-rich olivine from the Pujada Ophiolite, Philippines |
title_fullStr |
Petrogenesis of heterogeneous mantle peridotites with Ni-rich olivine from the Pujada Ophiolite, Philippines |
title_full_unstemmed |
Petrogenesis of heterogeneous mantle peridotites with Ni-rich olivine from the Pujada Ophiolite, Philippines |
title_sort |
petrogenesis of heterogeneous mantle peridotites with ni-rich olivine from the pujada ophiolite, philippines |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://doi.org/10.1016/j.jaesx.2020.100039 https://doaj.org/article/20ec05b915e94b0f82a9dbeb096d9cb7 |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Journal of Asian Earth Sciences: X, Vol 4, Iss , Pp 100039- (2020) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2590056020300153 https://doaj.org/toc/2590-0560 2590-0560 doi:10.1016/j.jaesx.2020.100039 https://doaj.org/article/20ec05b915e94b0f82a9dbeb096d9cb7 |
op_doi |
https://doi.org/10.1016/j.jaesx.2020.100039 |
container_title |
Journal of Asian Earth Sciences: X |
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4 |
container_start_page |
100039 |
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1766051554906865664 |