scholarly journals Late Cretaceous hydrothermal vent communities from the Troodos ophiolite, Cyprus: systematics and evolutionary significance

2021 ◽  
Author(s):  
Andrzej Kaim ◽  
Crispin T.S. Little ◽  
William J. Kennedy ◽  
Ellen M. Mears ◽  
Louise M. Anderson
Keyword(s):  
Late Cretaceous ◽  
Hydrothermal Vent ◽  
Evolutionary Significance ◽  
Troodos Ophiolite

Late Cretaceous hydrothermal vent communities from the Troodos ophiolite, Cyprus

Geology ◽  
1999 ◽  
Vol 27 (11) ◽  
pp. 1027 ◽  
Author(s):  
Crispin T. S. Little ◽  
Joe R. Cann ◽  
Richard J. Herrington ◽  
Michel Morisseau
Keyword(s):  
Late Cretaceous ◽  
Hydrothermal Vent ◽  
Troodos Ophiolite

Timing of subduction zone metamorphism during the formation and emplacement of Troodos and Baer–Bassit ophiolites: insights from 40Ar–39Ar geochronology

2007 ◽  
Vol 144 (5) ◽  
pp. 797-810 ◽  
Author(s):  
GAVIN HEUNG-NGAI CHAN ◽  
JOHN MALPAS ◽  
COSTAS XENOPHONTOS ◽  
CHING-HUA LO
Keyword(s):  
Subduction Zone ◽  
Late Cretaceous ◽  
Accretionary Prism ◽  
Passive Margin ◽  
Metamorphic Rocks ◽  
Metamorphic Complex ◽  
Troodos Ophiolite ◽  
Crustal Thinning ◽  
Step Heating ◽  
Short Time

The Troodos ophiolite in Cyprus and Baer–Bassit ophiolite in Syria together form part of the Tethyan ophiolite belt. They were generated in a supra-subduction zone setting in Late Cretaceous times. As with many of the ophiolite occurrences in this belt, the sequences are closely associated with tectonic ‘coloured mélange’ zones, which contain, among a variety of lithologies, metre- to kilometre-size blocks of metamorphic rocks. Precise 40Ar–39Ar laser step-heating experiments performed on four amphibolites from SW Cyprus and six from NW Syria, yield plateau ages ranging from 75.7±0.3 Ma to 88.9±0.8 Ma in Cyprus and 71.7±0.5 to 88.4±0.4 Ma in Syria. The older limits of these time spans are coeval with the age of the formation of the associated ophiolites. Unlike other metamorphic sole rocks which seem to form in relatively short time spans, these metamorphic rocks found in Cyprus and Syria are interpreted to have formed in Late Cretaceous times by accretion below the overriding Troodos and Baer–Bassit crust for a period of 15–18 Ma. The metamorphic complexes were exhumed by extension and crustal thinning associated with subduction roll-back and the rotation of the overriding plate until the cessation of subduction in Maastrichtian times. In Cyprus, the exhumed metamorphic complex was incorporated into an accretionary prism constructed primarily of the collapsed Mamonia passive margin sequence intercalated with rocks of the Troodos ophiolite during plate collision in the Maastrichtian. Concomitantly, in Syria, the Baer–Bassit ophiolite and subcreted metamorphic complex were emplaced onto the Arabian passive margin and fragmented into blocks and knockers, forming the Baer–Bassit mélange.

Late Cretaceous palaeoenvironments and biotas: an Antarctic perspective

1992 ◽  
Vol 4 (4) ◽  
pp. 371-382 ◽  
Author(s):  
J. A. Crame
Keyword(s):  
Late Cretaceous ◽  
High Latitude ◽  
Evolutionary Significance ◽  
Source Regions ◽  
Palynological Assemblages ◽  
James Ross Island ◽  
Extinction Events ◽  
The Antarctic ◽  
Cretaceous Period ◽  
Mass Extinction Events

The Cretaceous period is often regarded as one of "greenhouse" warmth, with perhaps its acme occurring in the late Albian stage (100 Ma ago). However, it is now apparent that, even at this time, there were significant meridional temperature gradients and distinct temperate biotas in the highest latitude regions. This is particularly so in the Southern Hemisphere, where an extensive Albian fossil record from Antarctica, Australia and New Zealand has revealed the presence of austral floras and faunas. With the recent improvements in stratigraphical correlations, it has become possible to trace the later Cretaceous palaeoenvironmental record in the Antarctic Peninsula region. Unfortunately, resolution of the early Late Cretaceous (Cenomanian–Coniacian stages) is still imprecise; there are some indications of strongly differentiated palynological assemblages, but studies of both macrofaunas and palaeotemperature estimates are incomplete. By the Santonian–Campanian, high-latitude biotas are well developed in the James Ross Island region and their enhancement through the final stages of the Cretaceous can be linked to a phase of global cooling. The persistence of low diversity temperate communities in high latitude regions may be of considerable ecological and evolutionary significance. For example, there is evidence to suggest that these communities may have been more resistant to mass extinction events; they may also have been important source regions for replacement taxa that arose after such events.

Neotethyan Late Cretaceous volcanic arc hydrothermal vent fauna

Geology ◽  
2007 ◽  
Vol 35 (9) ◽  
pp. 835 ◽  
Author(s):  
Crispin T.S. Little ◽  
Archil G. Magalashvili ◽  
David A. Banks
Keyword(s):  
Late Cretaceous ◽  
Hydrothermal Vent ◽  
Volcanic Arc

Evolutionary significance of floristic changes in the Northern Hemisphere during the Late Cretaceous and Palaeogene, with particular reference to Central Europe

1993 ◽  
Vol 78 (1-2) ◽  
pp. 41-54 ◽  
Author(s):  
E. Knobloch ◽  
Z. Kvaček ◽  
Č. Bůžek ◽  
D.H. Mai ◽  
D.J. Batten
Keyword(s):  
Central Europe ◽  
Northern Hemisphere ◽  
Late Cretaceous ◽  
Evolutionary Significance
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