References

aari

Проблемы Арктики и Антарктики

Arctic and Antarctic Research

0555-26482618-6713

Государственный научный центр Российской Федерации Арктический и антарктический научно-исследовательский институт

10.30758/0555-2648-2019-65-2-212-231

aari-164

Research Article

ГЕОЛОГИЯ И ГЕОФИЗИКА

GEOLOGY AND GEOPHYSICS

Уникальные геологические структуры района купола Лоу и ледников Вандерфорда и Тоттена (Земля Уилкса) по данным геофизических исследований

Unique geological structures of the Law Dome and Vanderford and Totten glaciers region (Wilkes Land) distinguished by geophysical data

Голынский

Д. А.

Golynsky

D. A.

Dmitry.A.Golynsky@gmail.com

Голынский

А. В.

Golynsky

A. V.

Всероссийский научно-исследовательский институт геологии и минеральных ресурсов Мирового океана имени академика И.С. Грамберга (ВНИИОкеангеология)РоссияAcademician I. S. GRAMBERG All-Russia Scientific Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia)Russian Federation

2019

09072019

652212231

2019

Голынский Д.А., Голынский А.В.

Golynsky D.A., Golynsky A.V.

Данная работа распространяется под лицензией Creative Commons Attribution 4.0.

This work is licensed under a Creative Commons Attribution 4.0 License.

https://www.aaresearch.science/jour/article/view/164

В работе анализируются геофизические данные проекта ICECAP/IceBridge для района купола Лоу на Земле Уилкса, которые подтверждают ранее высказанную идею о существовании рифтогенной структуры, подстилающей ледники Вандерфорда и Тоттена. Протяженность рифта превышает 400 км, а его ширина варьирует от 50 до 100 км. Результаты расчетов глубин до поверхности Мохоровичича свидетельствуют, что для осевой части рифта характерно существенное утонение коры до 24–26 км. Мощность осадочных отложений в пределах рифта превышает 3 км. Интенсивная отрицательная магнитная аномалия на куполе Лоу обусловлена обратным намагничением пород, ее площадь составляет порядка 9500 км2. Как наиболее вероятный источник аномалии рассматриваются породы гранитного или гранито-гнейсового состава.

Wilkes Land is a key region for Gondwana reconstruction, however it remains one of the largest regions on Earth with poorest knowledge of geology. This study comprehensively reviews the ICECAP/ IceBridge geophysical data for the Law Dome region including Vanderford and Totten adjacent glaciers over Wilkes Land and their role in obtaining new insight on the East Antarctic geology hidden under the ice cover. We analyzed more than 100,000 line kilometers of new magnetic, gravity and subglacial bedrock topography data that are available through the National Snow and Ice Data Center (USA). The newly acquired data supports our previous idea of the continuous rift structure existence at the southern boundary of Law Dome that runs between Vanderford and Totten Glaciers. The rift length exceeds 400 km and width varies from 50 to 100 km. In accordance with results of depth to Moho estimations and density modelling, for axial part of the rift it is characteristic an essential thinning of the Earth crust thickness, it is raised up to 24–26 km and continue to be elevated along entire length of this structure. The thickness of sedimentary rocks within the rift exceeds 3 km, their high density probably evidence that they were formed during Late Paleozoic – Early Mesozoic. The results of our investigations support tectonic nature of this structure as continuous rift developed since the Mesozoic extension phase (~160 Ma) of the Wilkes Land continental margin. Second distinctive structure is the strong reversely magnetized Law Dome magnetic anomaly with an area of about 9,500 km2. This anomaly would map out one of the largest mafic/ultramafic intrusions of the Earth, similar in extent to Norway’s Bjerkreim-Sokndal layered intrusion, the Coompana Block gabbro in Australia, or even the granitic-gneiss complex in the Adirondack Mountains of North America.

гравиметрическая информациямагнитные аномалииостаточная намагниченностьрадиолокационная съемкарифт

gravity informationmagnetic anomaliesradar surveysremanent magnetizationrift

Мы признательны коллегам Техасского университета (США) в Остине за возможность использования геофизических данных по проекту ICECAP/IceBridge. Д.А. Голынский участвовал в работе при поддержке Российского научного фонда (проект № 16-17-10139). Мы благодарны двум рецензентам за их полезные комментарии.

We are thankful to colleagues of the Texas University (USA) at Austin for possibility to use the ICECAP/IceBridge project geophysical data. D.A. Golynsky got support from the Russian Science Foundation (project № 16-17-10139). We are thankful reviewers for their helpful comments.

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The authors declare that there are no conflicts of interest present.