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Geochemical characterization of the Oman crust‐mantle transition zone, OmanDP holes CM1A and CM2B

Geochemical characterization of the Oman crust‐mantle transition zone, OmanDP holes CM1A and CM2B
Geochemical characterization of the Oman crust‐mantle transition zone, OmanDP holes CM1A and CM2B

The transition from the gabbroic oceanic crust to the residual mantle harzburgites of the Oman ophiolite has been drilled at Holes CM1A and CM2B (Wadi Tayin massif) during Phase 2 of the International Continental Scientific Drilling Program Oman Drilling Project (November 2017–January 2018). In order to unravel the formation processes of ultramafic rocks in the Wadi Tayin massif crust-mantle transition zone and deeper in the mantle sections beneath oceanic spreading centers, our study focuses on the whole rock major and trace element compositions (together with CO 2 and H 2O concentrations) of these ultramafic rocks (56 dunites and 49 harzburgites). Despite extensive serpentinization and some carbonation, most of the trace element contents (REE, HFSE, Ti, Th, U) record high temperature, magmatic process-related signatures. Two major trends are observed, with good correlations between (a) Th and U, Nb and LREE on one hand, and between (b) heavy REE, Ti and Hf on the other hand. We interpret the first trend as the signature of late melt/peridotite interactions as LREE are known to be mobilized by such processes (‘‘lithospheric process’’) and the second trend as the signature of the initial mantle partial melting (‘‘asthenospheric process’’), with little or no overprint from melt/rock reaction events.

ICDP Oman drilling project, Oman ophiolite crust-mantle transition, dunites and harzburgites serpentinization and carbonation, holes CM1A and CM2B, partial melting versus melt-rock reaction
2169-9313
Kourim, F.
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Rospabé, M.
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Dygert, N.
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Chatterjee, S.
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Takazawa, E.
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Wang, K.‐l.
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Godard, M.
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Benoit, M.
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Giampouras, M.
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Ishii, K.
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Teagle, D. A.‐h.
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Cooper, M.‐j.
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Kelemen, P.
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Kourim, F.
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Rospabé, M.
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Dygert, N.
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Chatterjee, S.
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Takazawa, E.
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Wang, K.‐l.
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Godard, M.
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Benoit, M.
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Giampouras, M.
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Ishii, K.
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Teagle, D. A.‐h.
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Cooper, M.‐j.
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Kelemen, P.
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Kourim, F., Rospabé, M., Dygert, N., Chatterjee, S., Takazawa, E., Wang, K.‐l., Godard, M., Benoit, M., Giampouras, M., Ishii, K., Teagle, D. A.‐h., Cooper, M.‐j. and Kelemen, P. (2022) Geochemical characterization of the Oman crust‐mantle transition zone, OmanDP holes CM1A and CM2B. Journal of Geophysical Research: Solid Earth, 127 (4), [e2021JB022694]. (doi:10.1029/2021JB022694).

Record type: Article

Abstract

The transition from the gabbroic oceanic crust to the residual mantle harzburgites of the Oman ophiolite has been drilled at Holes CM1A and CM2B (Wadi Tayin massif) during Phase 2 of the International Continental Scientific Drilling Program Oman Drilling Project (November 2017–January 2018). In order to unravel the formation processes of ultramafic rocks in the Wadi Tayin massif crust-mantle transition zone and deeper in the mantle sections beneath oceanic spreading centers, our study focuses on the whole rock major and trace element compositions (together with CO 2 and H 2O concentrations) of these ultramafic rocks (56 dunites and 49 harzburgites). Despite extensive serpentinization and some carbonation, most of the trace element contents (REE, HFSE, Ti, Th, U) record high temperature, magmatic process-related signatures. Two major trends are observed, with good correlations between (a) Th and U, Nb and LREE on one hand, and between (b) heavy REE, Ti and Hf on the other hand. We interpret the first trend as the signature of late melt/peridotite interactions as LREE are known to be mobilized by such processes (‘‘lithospheric process’’) and the second trend as the signature of the initial mantle partial melting (‘‘asthenospheric process’’), with little or no overprint from melt/rock reaction events.

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Geochemical Characterization of the Oman Crust-Mantle Transition Zone - Accepted Manuscript
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Accepted/In Press date: 24 December 2021
e-pub ahead of print date: 25 March 2022
Published date: 1 April 2022
Additional Information: Funding Information: This research used samples and/or data provided by the Oman Drilling Project (OmanDP). The OmanDP were funded from the International Continental Scientific Drilling Project (Kelemen, Matter, Teagle Lead PIs), the Sloan Foundation‐Deep Carbon Observatory (Grant 2014–3–01, Kelemen PI), the National Science Foundation (NSF–EAR–1516300, Kelemen lead PI), NASA–Astrobiology Institute (NNA15BB02A, Templeton PI), the German Research Foundation (DFG: KO 1723/21–1, Koepke PI), the Japanese Society for the Promotion of Science (JSPS no:16H06347, Michibayashi PI; and KAKENHI 16H02742, Takazawa PI), the European Research Council (Adv: no.669972; Jamveit PI), the Swiss National Science Foundation (SNF:20FI21_163,073, Früh–Green PI), JAMSTEC, the TAMU–JR Science Operator, and contributions from the Sultanate of Oman Ministry of Regional Municipalities and Water Resources, the Oman Public Authority of Mining, Sultan Qaboos University, CRNS–Univ. Montpellier II, Columbia University of New York, and the University of Southampton. K.W is grateful for receiving the National Science Council, Taiwan (NSC‐CDA‐107‐2628‐M‐001‐006‐MY4) and Academia Sinica, Taiwan (AS‐CDA‐107‐M01) funds. F.K.’s participation in shipboard and onsite logging was supported by The Institute of earth science Academia Sinica, Taiwan and by the research grants awarded to K. Michibayashi by the Japan Society for the Promotion of Science (Kiban‐B 16340151, Kiban‐B 19340148 and Kiban‐A 22244062). Funding Information: This research used samples and/or data provided by the Oman Drilling Project (OmanDP). The OmanDP were funded from the International Continental Scientific Drilling Project (Kelemen, Matter, Teagle Lead PIs), the Sloan Foundation-Deep Carbon Observatory (Grant 2014?3?01, Kelemen PI), the National Science Foundation (NSF?EAR?1516300, Kelemen lead PI), NASA?Astrobiology Institute (NNA15BB02A, Templeton PI), the German Research Foundation (DFG: KO 1723/21?1, Koepke PI), the Japanese Society for the Promotion of Science (JSPS no:16H06347, Michibayashi PI; and KAKENHI 16H02742, Takazawa PI), the European Research Council (Adv: no.669972; Jamveit PI), the Swiss National Science Foundation (SNF:20FI21_163,073, Fr?h?Green PI), JAMSTEC, the TAMU?JR Science Operator, and contributions from the Sultanate of Oman Ministry of Regional Municipalities and Water Resources, the Oman Public Authority of Mining, Sultan Qaboos University, CRNS?Univ. Montpellier II, Columbia University of New York, and the University of Southampton. K.W is grateful for receiving the National Science Council, Taiwan (NSC-CDA-107-2628-M-001-006-MY4) and Academia Sinica, Taiwan (AS-CDA-107-M01) funds. F.K.?s participation in shipboard and onsite logging was supported by The Institute of earth science Academia Sinica, Taiwan and by the research grants awarded to K. Michibayashi by the Japan Society for the Promotion of Science (Kiban-B 16340151, Kiban-B 19340148 and Kiban-A 22244062). Publisher Copyright: © 2022. American Geophysical Union. All Rights Reserved. Copyright: Copyright 2022 Elsevier B.V., All rights reserved.
Keywords: ICDP Oman drilling project, Oman ophiolite crust-mantle transition, dunites and harzburgites serpentinization and carbonation, holes CM1A and CM2B, partial melting versus melt-rock reaction

Identifiers

Local EPrints ID: 457432
URI: http://eprints.soton.ac.uk/id/eprint/457432
ISSN: 2169-9313
PURE UUID: b0dd66ac-ba79-4c91-84e7-413cdc6ecfca
ORCID for D. A.‐h. Teagle: ORCID iD orcid.org/0000-0002-4416-8409
ORCID for M.‐j. Cooper: ORCID iD orcid.org/0000-0002-2130-2759

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Date deposited: 07 Jun 2022 16:59
Last modified: 17 Mar 2024 07:14

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Contributors

Author: F. Kourim
Author: M. Rospabé
Author: N. Dygert
Author: S. Chatterjee
Author: E. Takazawa
Author: K.‐l. Wang
Author: M. Godard
Author: M. Benoit
Author: M. Giampouras
Author: K. Ishii
Author: M.‐j. Cooper ORCID iD
Author: P. Kelemen

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