Long-period eccentricity control on sedimentary sequences in the continental Madrid Basin (middle Miocene, Spain)

被引:59
作者
Abels, Hernmo A. [1 ]
Aziz, Hayfaa Abdul [1 ]
Krijgsman, Wout [1 ]
Smeets, Sander J. B.
Hilgen, Frederik J.
机构
[1] Univ Utrecht, Dept Earth Sci, Paleomagnet Lab Ft Hoofddijk, NL-3584 CD Utrecht, Netherlands
关键词
astronomical forcing; continental paleoenvironments; cyclostratigraphy; eccentricity; middle Miocene; Madrid Basin; sedimentary sequence; STRATIGRAPHY; CALIBRATION; DEPOSITS; RECORDS; CYCLES;
D O I
10.1016/j.epsl.2009.11.011
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The middle Miocene Valdearenas-Muduex section in the internally-drained, continental Madrid Basin (central Spain) is dated bio-magnetostratigraphically between 15.2 Ma and 11.5 Ma. The section contains two formation-scale, sedimentary sequences, that both consist of a siliciclastic lower part and a calcareous upper part. Siliciclastic sedimentation took place in distal floodplain and fluvial environments, while limestones resulted from carbonate precipitation in calcic soil profiles and in ephemeral lacustrine water bodies. Spectral analysis of the L* colour time series points to the influence of the similar to 405-kyr and 0.97-Myr eccentricity cycles, while the bases of the two calcareous intervals correlate to successive minima of the 2.4-Myr eccentricity cycle. The 405-kyr cycle lags maximum eccentricity, whereas the 0.97 and 2.4-Myr cycles lag minimum eccentricity, each by approximately a quarter of a cycle. No obliquity forcing is detected. The observed orbital configuration of 2.4-Myr minima at the base of limestone-dominated intervals is similar to a previously documented Late Miocene shift in the Teruel Basin of northeast Spain. Our results indicate that long-period eccentricity climate forcing may well be a significant player on long, tectonic time scales in continental basin fill. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:220 / 231
页数:12
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