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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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apatite (1)
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Primary terms
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Africa
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Southern Africa
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Namibia
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Damara Belt (1)
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Atlantic Ocean
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Equatorial Atlantic (1)
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North Atlantic
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Cape Verde Basin (1)
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Cape Verde Rise (1)
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Northwest Atlantic
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Demerara Rise (1)
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South Atlantic
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Angola Basin (3)
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Cape Basin (1)
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Rio Grande Rise (1)
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Southeast Atlantic (1)
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Walvis Ridge (5)
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West Atlantic (1)
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Atlantic Ocean Islands
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carbon
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IPOD
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DSDP Site 511 (1)
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Leg 75
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DSDP Site 144 (1)
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Ocean Drilling Program
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Leg 123
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Leg 159
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ODP Site 959 (1)
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Leg 175
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ODP Site 1082 (1)
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ODP Site 1083 (1)
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Leg 207
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sedimentary rocks
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sediments
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marine sediments (2)
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DSDP Site 530
Hotspot origin for asymmetrical conjugate volcanic margins of the austral South Atlantic Ocean as imaged on deeply penetrating seismic reflection lines
South Atlantic opening: A plume-induced breakup?
Formation of “Southern Component Water” in the Late Cretaceous: Evidence from Nd-isotopes
Abstract Post-Turonian (Late Cretaceous) rudist-bearing limestones of the Nurra region in northwestern Sardinia (northern Tethyan margin) and in the central-southern Apennines and Apulia (central Tethyan domain) have recorded relevant changes in the characteristics of the carbonate platforms following the “middle” Cretaceous crisis events which affected the peri-Tethyan region as well as other regions worldwide. Rudist bivalves became the dominant lithogenetic taxon owing to their proliferation in shallow-water environments and strong dominance of Late Cretaceous carbonate factories. Their inception, evolution, and demise were seemingly controlled by a complex interplay of environmental processes that, acting on a global scale, profoundly modified the Early Cretaceous hydrosphere-atmosphere system and forced Tethyan depositional systems to change their organization, internal architecture, and facies patterns. As a result, wide, open shelves developed where the almost ubiquitous mode of carbonate fixation was that of foramol factories. In this paper, evidence of the remarkable regional variability in the rudist-bearing carbonate platforms of the Mediterranean Tethys is presented. The analysis of the resulting shallow-water facies has demonstrated that, in spite of several stratigraphic similarities and common sedimentological features, some remarkable differences occurred between the northern Tethyan margin and the central Tethyan banks as regards the areal partitioning of the main paleoecologic controlling factors. This resulted in the deposition of rhodalgal successions in Sardinia (northern Tethyan margin) and rudist-rich foramol facies in the Apennine-Apulia (central Tethys) regions, respectively. Such Late Cretaceous carbonate systems can be viewed as geological products which have closely and coherently recorded the globally changing environmental conditions of the oceanic realm. In spite of this, the difference of the facies partitioning in different Tethyan regions according to a latitudinal gradient is interpreted as derived mainly from local variable paleoceanographic and paleoclimatic conditions.