Результаты исследований: Научные публикации в периодических изданиях › Обзорная статья › Рецензирование
Structure and Mesozoic evolution of the eastern Weddell Sea, Antarctica : History of early Gondwana break-up. / Leitchenkov, G. L.; Miller, H.; Zatzepin, E. N.
в: Geological Society Special Publication, Том 108, 01.12.1996, стр. 175-190.Результаты исследований: Научные публикации в периодических изданиях › Обзорная статья › Рецензирование
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TY - JOUR
T1 - Structure and Mesozoic evolution of the eastern Weddell Sea, Antarctica
T2 - History of early Gondwana break-up
AU - Leitchenkov, G. L.
AU - Miller, H.
AU - Zatzepin, E. N.
PY - 1996/12/1
Y1 - 1996/12/1
N2 - Interpretation of combined data sets, collected by Russian and German expeditions in the eastern Weddell Sea (EWS), was carried out to give new insight into the problem of early Gondwana breakup. Dominant features of the EWS margin are an initial rift structure which is flanked by a wedge of seaward dipping reflectors. The latter seems to be a volcanic sequence extruded near the continent-ocean boundary and underlain by a dyke suite, part of which is injected through the adjacent normal continental crust. Onset of rifting in the EWS was associated with the emplacement of a mantle plume which further weakened the lithosphere leading to its breakup and excessive production of igneous material. There is a regional correlation between the extent of the mantle thermal anomaly around the plume and tectonic processes (intensity of magmatism, crustal uplift, manner of rifting) which tend to attenuate away from the plume centre. Rearrangement of seafloor spreading, including a ridge jump, followed the initial rifting phase. Opening of EWS during Late Jurassic time resulted in the formation of an oceanic basin more than 400 km wide. By the end of Late Jurassic time this basin was obliquely cut off by a transcurrent fault due to plate reorganisation and movement of Antarctica southward. This regime ended in the Early Cretaceous when new spreading in the Weddell Sea overlapped the transform boundary.
AB - Interpretation of combined data sets, collected by Russian and German expeditions in the eastern Weddell Sea (EWS), was carried out to give new insight into the problem of early Gondwana breakup. Dominant features of the EWS margin are an initial rift structure which is flanked by a wedge of seaward dipping reflectors. The latter seems to be a volcanic sequence extruded near the continent-ocean boundary and underlain by a dyke suite, part of which is injected through the adjacent normal continental crust. Onset of rifting in the EWS was associated with the emplacement of a mantle plume which further weakened the lithosphere leading to its breakup and excessive production of igneous material. There is a regional correlation between the extent of the mantle thermal anomaly around the plume and tectonic processes (intensity of magmatism, crustal uplift, manner of rifting) which tend to attenuate away from the plume centre. Rearrangement of seafloor spreading, including a ridge jump, followed the initial rifting phase. Opening of EWS during Late Jurassic time resulted in the formation of an oceanic basin more than 400 km wide. By the end of Late Jurassic time this basin was obliquely cut off by a transcurrent fault due to plate reorganisation and movement of Antarctica southward. This regime ended in the Early Cretaceous when new spreading in the Weddell Sea overlapped the transform boundary.
UR - http://www.scopus.com/inward/record.url?scp=0141915911&partnerID=8YFLogxK
U2 - 10.1144/GSL.SP.1996.108.01.13
DO - 10.1144/GSL.SP.1996.108.01.13
M3 - Review article
AN - SCOPUS:0141915911
VL - 108
SP - 175
EP - 190
JO - Geological Society Special Publication
JF - Geological Society Special Publication
SN - 0305-8719
ER -
ID: 35966610