Discontinuities in the History of Sea-floor Spreading

Nature ◽  
1968 ◽  
Vol 217 (5135) ◽  
pp. 1212-1222 ◽  
Author(s):  
ERIC D. SCHNEIDER ◽  
PETER R. VOGT
Keyword(s):  
Sea Floor ◽  
History Of ◽  
Sea Floor Spreading

History of Sea-Floor Spreading West of Baja California

1970 ◽  
Vol 81 (2) ◽  
pp. 491 ◽  
Author(s):  
C. G. CHASE ◽  
H. W. MENARD ◽  
R. L. LARSON ◽  
G. F. SHARMAN ◽  
S. M. SMITH
Keyword(s):  
Baja California ◽  
Sea Floor ◽  
History Of ◽  
Sea Floor Spreading

Cretaceous

1992 ◽  
Vol 13 (1) ◽  
pp. 131-139 ◽  
Author(s):  
J. M. Hancock ◽  
P. F. Rawson
Keyword(s):  
Early Cretaceous ◽  
Sedimentary Basins ◽  
Major Change ◽  
The Arctic ◽  
Sea Floor ◽  
The North ◽  
Marine Sedimentation ◽  
History Of ◽  
Sea Floor Spreading ◽  
Sea Area

AbstractEarly CretaceousThe Cretaceous Period lasted for about 70 million years. During this time there was a major change in the sedimentary history of the area as tectonism died down and deposition started of an extensive blanket of coccolith ooze: the Chalk. The change took place mainly over a brief interval across the Albian/Cenomanian (Lower/Upper Cretaceous) boundary, at about 95 Ma. Until that time crustal extension along the Arctic-North Atlantic megarifts continued to influence the tectonic evolution of northwest Europe (Ziegler 1982, 1988). This tensional régime caused rifting and block faulting, particularly across the Jurassic-Cretaceous boundary (Late Cimmerian movements) and in the mid Aptian (Austrian phase). During the latter phase, sea-floor spreading commenced in the Biscay and central Rockall Rifts. The northern part of the Rockall Rift began to widen too, possibly by crustal stretching rather than sea-floor spreading (Ziegler 1988, p. 75). During the Albian the regional pattern began to change and by the beginning of the Cenomanian rifting had effectively ceased away from the Rockall/Faeroe area.Most of the Jurassic sedimentary basins continued as depositional areas during the Early Cretaceous, but the more extensive preservation of Lower Cretaceous sediments provides firmer constraints on some of the geographical reconstructions. The marked sea-level fall across the Jurassic-Cretaceous boundary isolated the more southerly basins as areas of non-marine sedimentation, and it was not until the beginning of the Aptian that they became substantially marine.The extent of emergence of highs in the North Sea area is difficult to assess, especially where

The sea-floor spreading history of the eastern Indian Ocean

1982 ◽  
Vol 5 (3) ◽  
pp. 225-247 ◽  
Author(s):  
Thomas S. Powell ◽  
Bruce P. Luyendyk
Keyword(s):  
Indian Ocean ◽  
Eastern Indian Ocean ◽  
Sea Floor ◽  
History Of ◽  
Sea Floor Spreading

A displaced Tibetan massif as a possible source of some Malayan rocks

1972 ◽  
Vol 109 (6) ◽  
pp. 483-489 ◽  
Author(s):  
A. R. Crawford
Keyword(s):  
Indian Ocean ◽  
Siberian Platform ◽  
Sea Floor ◽  
History Of ◽  
The Indian Ocean ◽  
Sea Floor Spreading

SummaryExplanations (Burton, 1970; Ridd, 1971) of the westerly origin of the sediments now forming the rocks of northwest Malaya, by deriving them from an India which once lay contiguously against Malaya are unacceptable because of the complexity of the movement of Gondwanic India and the known history of the Indian Ocean. The effects of the movement of India into Asia were such that the Tibetan part of the orogen which continues south through Yunnan into Malaya was distorted. Before the arrival of India the Tibetan massif also may have lain still further away from the rest of Asia and moved towards the Siberian Platform by sea-floor spreading in the Tethys, so that its erosion could have provided material now forming part of Malaya. The Tibetan–Yunnan–Malay orogen has a complex and probably sutured form.

Geological setting and principal results of drilling on the margins of the Bay of Biscay and Rockall Plateau during Leg 48

1980 ◽  
Vol 294 (1409) ◽  
pp. 65-75 ◽  
Keyword(s):  
Deep Sea ◽  
Lower Cretaceous ◽  
Structural Development ◽  
Bay Of Biscay ◽  
Sea Floor ◽  
Passive Margins ◽  
Geological Setting ◽  
History Of ◽  
Sea Floor Spreading ◽  
Drilling Project

During Leg 48 of the IPOD phase of the Deep Sea Drilling Project, seven holes were drilled on the margins of the Bay of Biscay and Rockall Plateau to compare the evolution of passive margins of contrasting age and structural development. The geological setting and principal results of the drilling are outlined for each margin. We discuss the history of rifting and subsidence on these margins in relation to the sea floor spreading history of the adjacent ocean basins. Implications of the results for the nature of unconformities at passive margins and anoxic episodes during the Lower Cretaceous are discussed briefly.

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