Neogene tectonic and climatic evolution of the Western Ross Sea, Antarctica — Chronology of events from the AND-1B drill hole

Neogene tectonic and climatic evolution of the Western Ross Sea, Antarctica — Chronology of events from the AND-1B drill hole
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南极洲西罗斯海的新近纪构造和气候演化 â AND-1B 钻孔事件年表

DOI:
10.1016/j.gloplacha.2012.05.019
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发表时间:
2012
影响因子:
3.9
通讯作者:
Browne
Browne
中科院分区:
地球科学1区
文献类型:
--
作者:
Wilson;Powell;Florindo;Ohneiser;Sagnotti;Winter;Henrys;Krissek;Niessen;Pompillio;Scherer;Alloway;Barrett;Brachfeld;Browne

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Stratigraphic drilling from the McMurdo Ice Shelf in the 2006/2007 austral summer recovered a 1284.87m sedimentary succession from beneath the sea floor. Key age data for the core include magnetic polarity stratigraphy for the entire succession, diatom biostratigraphy for the upper 600m and40Ar/39Ar ages for in-situ volcanic deposits as well as reworked volcanic clasts. A vertical seismic profile for the drill hole allows correlation between the drill hole and a regional seismic network and inference of age constraint by correlation with well‐dated regional volcanic events through direct recognition of interlayered volcanic deposits as well as by inference from flexural loading of pre‐existing strata. The combined age model implies relatively rapid (1m/2–5ky) accumulation of sediment punctuated by hiatuses, which account for approximately 50% of the record. Three of the longer hiatuses coincide with basin‐wide seismic reflectors and, along with two thick volcanic intervals, they subdivide the succession into seven chronostratigraphic intervals with characteristic facies:
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