Abstract
Mesozoic ophiolites are an important feature of Cuban geology. Although Cuban ophiolites have been studied over the past 40 years, there is still need for systematic studies regarding their internal structure, geochemical characteristics, and emplacement mechanisms. The ophiolites are distributed along the so-called “Northern” and “Eastern” Cuban ophiolite belts, and are strongly dismembered and intermingled mainly with Cretaceous volcanic arc rocks. Ophiolite-associated basalts along the northern Cuban orogenic belt record magmatic history of the ophiolite formation from the Protocaribbean seafloor spreading to subduction initiation stage. We have compiled geochemical data of 15 oceanic basalt samples from previous works, together with data of an analyzed sample during this study. We discuss geochemical criteria based on immobile element proxies for fractionation indices, alkalinity, mantle flow and subduction addition, and field relationships, providing a comprehensive ophiolite classification according to the tectonic setting at which these ophiolites formed. The lavas exhibit three magmatic types. One type has subduction-related fingerprint with dominance of boninite and IAT affinities, likely related to a forearc setting. The second type has a MOR-type (N-MORB and E-MORB) signature, most of them carrying a subtle influence of subduction component, overlapping a border of the backarc field. Subordinately, a transitional type occurs with MOR-type-OIB fingerprint that is considered most likely plume-type ophiolite. The results show then that the studied lavas correspond mostly to subduction-related ophiolite and some of them have incorporated subduction component probably during the time when the Protocaribbean oceanic lithosphere downgoing beneath the Caribbean plate. Some rare remnants of plume-MORB-type ophiolite have also occurred.
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Abbreviations
- BA:
-
Backarc
- CA:
-
Calc-Alkaline
- C-MORB:
-
Contaminated Middle Ocean Ridge Basalt
- ECOB:
-
Eastern Cuban Ophiolite Belt
- E-MORB:
-
Enriched Middle Ocean Ridge Basalt
- FA:
-
Forearc
- FAB:
-
Forearc Basalt
- Fm:
-
Formation
- IAT:
-
Island Arc Tholeites
- ICP-EOS:
-
Inductively Coupled Plasma Optical Emission Spectrometer
- ICP-MS:
-
Inductively Coupled Plasma Emission Mass Spectrometer
- INAA:
-
Instrumental Neutron Activation Analysis
- MOR:
-
Mid-Ocean Ridge
- MORB:
-
Mid-Ocean Ridge Basalt
- My:
-
Millions of years
- N-MORB:
-
Normal Middle Ocean Ridge Basalt
- NCOB:
-
Northern Cuban Ophiolite Belt
- OIB:
-
Ocean Island Basalt
- P-type:
-
Plume type
- REE:
-
Rare Earth Elements
- TAS:
-
Total Alkali Silica
- VA:
-
Volcanic Arc
- WSU:
-
Washington State University
- XRF:
-
X-ray Fluorescence Spectrometry
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Acknowledgements
We thank the Instituto de Geología y Paleontología/Servicio Geológico de Cuba for covering the expenses of geochemical analyses of sample SC1 introduced in this study and for allowing in the framework of a research project to perform this scientific work. We express our sincere thanks to Dr. Manuel E. Pardo Echarte, Dr. Jorge Rabassa, and Springer Editorial for giving us the opportunity to contribute this paper to the special monograph on Geology of Cuba.
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Llanes Castro, A.I., Furnes, H. (2021). Geochemical Fingerprinting of Ancient Oceanic Basalts: Classification of the Cuban Ophiolites. In: Pardo Echarte, M.E. (eds) Geology of Cuba. Regional Geology Reviews. Springer, Cham. https://doi.org/10.1007/978-3-030-67798-5_6
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