Evidence for subaerial development of the Caribbean oceanic plateau in the Late Cretaceous and palaeo-environmental implications

Buchs, David M.; Kerr, Andrew C.; Brims, Joanna C.; Zapata-Villada, Juan Pablo; Correa-Restrepo, Tomás; Rodríguez, Gabriel

doi:10.1016/j.epsl.2018.07.020

Cited by 39 publications

(26 citation statements)

References 46 publications

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“…everywhere, but the uplifted part got eroded, as some geological evidence suggest for CLIP-related subaerial volcanism (Buchs et al, 2018). Indeed, the erosion of the Large Igneous Plateaus (LIP) has been widely recognised in other plateaus worldwide, including extreme cases where the preserved structure includes areas of no basalts in the centre of the plume head (Ernst et al, 2005).…”

Section: Implications For the Tectonic Development Of The Present-daymentioning

confidence: 99%

The preserved plume of the Caribbean Large Igneous Plateau revealed by 3D data-integrative models

Gómez-García¹,

Breton²,

Scheck‐Wenderoth³

et al. 2020

Preprint

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Abstract. Remnants of the Caribbean Large Igneous Plateau (CLIP) are found as thicker than normal oceanic crust in the Caribbean Sea, that formed during rapid pulses of magmatic activity at ~ 91–88 Ma and ~ 76 Ma. Strong geochemical evidence supports the hypothesis that the CLIP formed due to melting of the plume head of the Galápagos hotspot, which interacted with the Farallon (Proto-Caribbean) plate in the east Pacific. Considering the plate tectonics theory, it is expected that the lithospheric portion of the plume-related material migrated within the Proto-Caribbean plate, in a north–north-eastward direction, developing the present-day Caribbean plate. In this research, we used 3D lithospheric-scale, data-integrative models of the current Caribbean plate setting to reveal, for the first time, the presence of positive density anomalies in the uppermost lithospheric mantle. These models are based on the integration of up-to-date geophysical datasets, from the Earth’s surface down to 200 km depth, which are validated using high-resolution free-air gravity measurements. Based on the gravity residuals (modelled minus observed gravity), we derive density heterogeneities both in the crystalline crust and the uppermost oceanic mantle (

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Section: Implications For the Tectonic Development Of The Present-daymentioning

confidence: 99%

The preserved plume of the Caribbean Large Igneous Plateau revealed by 3D data-integrative models

Gómez-García¹,

Breton²,

Scheck‐Wenderoth³

et al. 2020

Preprint

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“…As Mabberley (1992: 17) noted: "… much of the land accreted along the western coast of the Americas since the Middle Jurassic comprises various fragments, some from far away in the Pacific". There is now good evidence that parts of the large igneous plateaux that formed in the West Pacific (Ontong Java, Hikurangi and Manihiki Plateaux) were subaerial (Heads, 2014: 205;Buchs et al, 2018;Hochmuth et al, 2019), and that components of the Manihiki Plateau collided with western Colombia (Hochmuth & Gohl, 2017).…”

Section: Trans-pacific Distributionsmentioning

confidence: 99%

Biogeography and ecology in a pantropical family, the Meliaceae

Heads¹

2019

GBS

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This paper reviews the biogeography and ecology of the family Meliaceae and maps many of the clades. Recently published molecular phylogenies are used as a framework to interpret distributional and ecological data. The sections on distribution concentrate on allopatry, on areas of overlap among clades, and on centres of diversity. The sections on ecology focus on populations of the family that are not in typical, dry-ground, lowland rain forest, for example, in and around mangrove forest, in peat swamp and other kinds of freshwater swamp forest, on limestone, and in open vegetation such as savanna woodland. Information on the altitudinal range of the genera is presented, and brief notes on architecture are also given. The paper considers the relationship between the distribution and ecology of the taxa, and the interpretation of the fossil record of the family, along with its significance for biogeographic studies. Finally, the paper discusses whether the evolution of Meliaceae can be attributed to 'radiations' from restricted centres of origin into new morphological, geographical and ecological space, or whether it is better explained by phases of vicariance in widespread ancestors, alternating with phases of range expansion.

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“…Leterrier et al (1982). Additional reference clinopyroxene data in (B) include clinopyroxenes from depleted (Group 3) basalts of accreted Palaeocene seamounts in the outer Osa Igneous Complex (sample DB02-216 in Supplementary File 2), proto-arc basalts and basaltic-andesite of the Golfito Complex (microprobe data from Buchs, 2008, also reported in Supplementary File 2), and oceanic plateau basalt from Upper Cretaceous oceanic sequences accreted in W Colombia (SEM-EDS data from Buchs et al, 2018). Fig.6.…”

Section: Discussionmentioning

confidence: 99%

“…In order to better constrain the origin of MORB-like detrital Cpx, we compared our results with 3 Cpx populations representative of potential volcanic sources in south Costa Rica: (1) basalts from depleted accreted seamounts in the outer OIC (sample DB02-216 of Group 3 in Buchs et al, 2016, new data presented in Supplementary File 2); (2) oceanic plateau basalts from western Colombia (data from Buchs et al, 2018, compositionally similar to the inner OIC); and (3) proto-arc basalts to basaltic andesites from the Golfito Complex (data from Buchs, 2008). As shown in Supplementary File 6 and Fig.5C, these reference datasets plot across the MORB-like -Arc discrimination boundary in the Ca vs Ti +Cr diagram of Leterrier et al (1982).…”

Section: Geochemistry Of Detrital Pyroxenes and Amphibolesmentioning

confidence: 99%

Long-term non-erosive nature of the south Costa Rican margin supported by arc-derived sediments accreted in the Osa Mélange

Buchs

Oemering

2020

Earth and Planetary Science Letters

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Understanding the erosive and accretionary nature of convergent margins is significant to understand tectonics and the crustal mass balance at subduction zones. The Costa Rican margin is commonly regarded as an archetypal example of an erosive margin, where subduction of sediments and basal removal of the upper plate in the subduction zone have occurred for most of the Cainozoic. This view is supported by structural constraints from 3D seismic reflection data in the outer forearc, as well as periods of forearc subsidence at ODP/DSDP/IODP drill sites. However, determining the origin of the Upper Eocene-Miocene Osa Mélange that is exposed in south Costa Rica only 10-30 km from today's trench offers another opportunity to constrain the long-term erosive, accretionary, and/or nonerosive evolution of the margin. Existing models for formation of the mélange propose that it resulted from (i) accretion of arc-derived trench-fill sediments, (ii) punctual accretion of the clastic apron of an ocean islands system, (iii) local dismemberment of the margin due to tectonic erosion, or (iv) in-situ deformation of a forearc sedimentary cover. To test the validity of these models and provide new constraints on the accretionary and/or erosive nature of the margin we studied the provenance of volcaniclastic material in the Upper Eocene San Pedrillo Unit of the Osa Mélange using geochemical analysis of detrital pyroxenes, amphiboles and igneous rocks. This innovative approach to determine the origin(s) of dismembered sedimentary sequences reveals that the volcaniclastic fraction of the mélange is, without ambiguity, predominantly composed of forearc material that preserves an assemblage of arc basement, proto-arc and arc sequences of the pre-Oligocene Costa Rican margin. This result and previous geological constraints show that the Osa Mélange formed through accretion of arc-derived trench-fill deposits in the Late Eocene to Miocene, with possibly minor tectonic incorporation of intra-oceanic material (ocean floor and seamount sequences). Therefore, consistently with recent seismic observations in south Costa Rica that document a phase of accretion within the past ∼5m.yr., preservation of arc-derived sediments in the Osa Mélange shows that the margin was predominantly non-erosive over the past ∼35m.yr. Cycles of subsidence and uplift in the south Costa Rican forearc during this period could represent a tectonic response to episodic subduction of seamounts formed at the Galapagos Hotspot, without causal link to short-term subduction erosion or accretion. Fundamentally, new results from the Osa Mélange show that large (10 km-thick) accretionary complexes can form durably due to local sedimentary recycling of the forearc in seamount collisional settings. The recycled component of the NW Osa Mélange exemplifies that quantifying the extent of local recycling vs net crustal addition through accretion of intra-oceanic sequences or net crustal loss due to tectonic erosion poses a serious challenge to determine the crustal mass balance at sub...

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Evidence for subaerial development of the Caribbean oceanic plateau in the Late Cretaceous and palaeo-environmental implications

Cited by 39 publications

References 46 publications

The preserved plume of the Caribbean Large Igneous Plateau revealed by 3D data-integrative models

The preserved plume of the Caribbean Large Igneous Plateau revealed by 3D data-integrative models

Biogeography and ecology in a pantropical family, the Meliaceae

Long-term non-erosive nature of the south Costa Rican margin supported by arc-derived sediments accreted in the Osa Mélange

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