Lithostratigraphy from downhole logs in Hole AND-1B, Antarctica
Lithostratigraphy from downhole logs in Hole AND-1B, Antarctica
复制标题
南极洲 AND-1B 井下测井的岩石地层学
DOI:
10.1130/ges00655.1
复制
发表时间:
2012
期刊:
影响因子:
2.5
通讯作者:
Powell RD
中科院分区:
文献类型:
--
作者:
Williams T;Morin RH;Jarrard RD;Jackolski CL;Henrys SA;Niessen F;Magens D;Kuhn G;Monien D;Powell RD
The ANDRILL (Antarctic Drilling Project) McMurdo Ice Shelf (MIS) project drilled 1285 m of sediment in Hole AND-1B, representing the past 12 m.y. of glacial history. Downhole geophysical logs were acquired to a depth of 1018 mbsf (meters below seafloor), and are complementary to data acquired from the core. The natural gamma radiation (NGR) and magnetic susceptibility logs are particularly useful for understanding lithological and paleoenvironmental change at ANDRILL McMurdo Ice Shelf Hole AND-1B. NGR logs cover the entire interval from the seafloor to 1018 mbsf, and magnetic susceptibility and other logs covered the open hole intervals between 692 and 1018 and 237–342 mbsf. In the upper part of AND-1B, clear alternations between low and high NGR values distinguish between diatomite (lacking minerals containing naturally radioactive K, U, and Th) and diamictite (containing K-bearing clays, K-feldspar, mica, and heavy minerals). In the lower open hole logged section, NGR and magnetic susceptibility can also distinguish claystones (rich in K-bearing clay minerals, relatively low in magnetite) and diamictites (relatively high in magnetite). Sandstones can be distinguished by their high resistivity values in AND-1B. On the basis of these three downhole logs, diamictite, claystones, and sandstones can be predicted correctly for 74% of the 692–1018 mbsf interval. The logs were then used to predict facies for the 6% of this interval that was unrecovered by coring. Given the understanding of the physical property characteristics of different facies, it is also possible to identify subtle changes in lithology from the physical properties and help refine parts of the lithostratigraphy, for example, the varying terrigenous content of diatomites and the transitions from subice diamictite to open-water diatomite.
登录
查看更多内容
DOI:
--
发表时间:
2007
期刊:
--
影响因子:
--
作者:
R. Morin;T. Williams;S. Henrys;T. Crosby;D. Hansaraj
通讯作者:
D. Hansaraj
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
T. Wonik;T. Grelle;D. Handwerger;R. Jarrard;A. McKee;T. Patterson;T. Paulsen;S. Pierdominici;D. Schmitt;H. Schröder;M. Speece;T. Wilson
通讯作者:
T. Wilson
影响因子:
3.9
作者:
G. Giorgetti;F. Talarico;S. Sandroni;A. Zeoli
通讯作者:
A. Zeoli
DOI:
--
发表时间:
2000
期刊:
--
影响因子:
--
作者:
C. Bücker;R. Jarrard;T. Wonik;J. Brink
通讯作者:
J. Brink
DOI:
--
发表时间:
1994-05
期刊:
--
影响因子:
--
作者:
J. Doveton
通讯作者:
J. Doveton