Astronomically calibrated ages for geomagnetic reversals within the Matuyama chron

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Title:	Astronomically calibrated ages for geomagnetic reversals within the Matuyama chron
Authors:	Chorng-Shern Horng Meng-Yang Lee Heiko P¨alike Kuo-Yen Wei Wen-Tzong Liang Yoshiyuki Iizuka Masayuki Torii 飯塚義之李孟陽梁文宗
Contributors:	臺北市立教育大學自然科學系
Date:	2002
Issue Date:	2009-07-31 10:34:39 (UTC+8)
Abstract:	We present a magnetostratigraphic record from the western Philippine Sea that is tied to a marine δ18O record for the past 2.14 million years. The ages of geomagnetic reversals were astronomically calibrated by tuning the oxygen isotopic stratigraphy, yielding a chronology for the following subchrons: Matuyama/Brunhes boundary, 781±3 ka (slightly above δ18O Stage 19.3); top of the Santa Rosa polarity interval, 920 ± 2 ka (Stage 23/24); base of the Santa Rosa polarity interval, 925 ± 1 ka (Stage 24); top of the Jaramillo subchron, 988 ± 3 ka (Stage 27); base of the Jaramillo subchron, 1072 ± 2 ka (Stage 31); top of the Cobb Mountain subchron, 1173 ± 4 ka (Stage 35/36); base of the Cobb Mountain subchron, 1185 ± 5 ka (Stage 36); top of the Olduvai subchron, 1778 ± 3 ka (Stage 63/64); base of the Olduvai subchron, 1945 ± 4 ka (Stage 71/72); top of the R´eunion II subchron, 2118 ± 3 ka (Stage 80/81); and base of the R´eunion II subchron, 2133 ± 5 ka (Stage 81). This astronomically calibrated chronology independently confirms the ages of major reversals in recently published astronomically calibrated polarity timescales for the Matuyama chron. It also provides the first astronomically calibrated dates for the lower and upper reversals associated with the Cobb Mountain and Santa Rosa polarity intervals, respectively.
Relation:	Earth Planets Space, 54, p.679–690
Appears in Collections:	[Department of Applied Physics and Chemistry] Periodical Articles

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