Galicia Margin

Boillot, G.; Winterer, E.L.; Meyer, A.W.

doi:10.2973/odp.pr.103.1985

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…Second, black shales become progressively more hydrogen-rich from Neocomian to Cenomanian deposits. As described in the Site Summary chapters (Boillot et aL, 1987), Tm~ values are in the range of 40(O20°C, which is typical of immature organic matter (Espitalie et aL, 1977).…”

Section: Carbon Isotope and Rock-eval Analysesmentioning

confidence: 94%

Organic geochemistry of Cretaceous black shales from the Galicia Margin, Ocean Drilling Program Leg 103

Meyers

Dunham

1988

Organic Geochemistry

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Organic-carbon-rich "black shales" from three different Cretaceous episodes sampled during Ocean Drilling Program Leg 103 have been studied by organic geochemical methods. Rock-Eval analysis, carbon isotope data, and lipid biomarkers show organic matter to contain varying proportions of marine and continental materials. In Hauterivian-Barremian organic-carbon-rich turbiditic marlstones, major amounts of land-derived organic matter are found. Aptian-Albian black-colored shales are interspersed within green claystones, from which they differ by containing more marine organic matter. An abbreviated layer of black shale from the Cenomanian-Turonian boundary is dominated by well-preserved marine organic matter. Downslope transport and rapid reburial within a predominantly oxygenated dcepwater setting created most of these examples of black shales, except for the Cenomanian-Turonian deposits in which decpwater anoxia may have been involved.

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Section: Carbon Isotope and Rock-eval Analysesmentioning

confidence: 94%

Organic geochemistry of Cretaceous black shales from the Galicia Margin, Ocean Drilling Program Leg 103

Meyers

Dunham

1988

Organic Geochemistry

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“…(d) Same as in Figure c but along the West Iberian margin: (4) Sutra and Manatschal [] IAM‐ 9, (5) Clark et al [] ISE 9, and (6) Afilhado et al [] IAM 5. Drill cores: 1070 [ Jagoutz et al ., ; Zhao , ], 1068 [ Jagoutz et al ., ], 1067 [ Jagoutz et al ., ], 899 [ Zhao , , ], 897 [ Zhao , , ], and 637 [ Boillot et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Assessing discrepancies between previous plate kinematic models of Mesozoic Iberia and their constraints

2016

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Currently, there are several published end-member plate models that describe the evolution of Iberia during the Mesozoic. We review key geological and geophysical data sets previously used as constraints on these models including (1) geological interpretations of Pyrenean geology; (2) end-member interpretations of magnetic anomalies along the West Iberian and Newfoundland margins and Bay of Biscay;(3) the paleomagnetic data set of Iberia; and (4) seismic tomography models, which have previously been used to support Cretaceous subduction between Iberia and Eurasia. From this review we identify key constraints and argue that a reasonable plate kinematic model of Iberia should satisfy all of these. Instead, we determine inconsistencies between these key constraints and several published end-member plate models through a kinematic analysis using the GPlates software. We also analyze published seismic tomography models, not previously considered, across northern Africa and Iberia, and identify no slab preserved within the mantle supposedly linked to Cretaceous subduction between Iberia and Eurasia. A lack of published geological evidence along the Pyrenees supporting this subduction history also casts doubt on this scenario. Our kinematic analysis highlights that, first, the cessation in transtensional motion between Iberia and Eurasia by the Albian cannot be kinematically reconciled with the concurrent breakup between Iberia and Newfoundland in the Atlantic when reconstructing existing continent-ocean boundary interpretations along their respective margins. Second, either fit of the contentious end-member M 0 interpretations (~120.6 Ma) between Iberia and Newfoundland implies plate velocities of Iberia that results in its undocumented transpressional or compressional motion relative to Eurasia until C 34 .

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Galicia Margin

Cited by 2 publications

References 3 publications

Organic geochemistry of Cretaceous black shales from the Galicia Margin, Ocean Drilling Program Leg 103

Organic geochemistry of Cretaceous black shales from the Galicia Margin, Ocean Drilling Program Leg 103

Assessing discrepancies between previous plate kinematic models of Mesozoic Iberia and their constraints

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