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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Astronomical ages for Miocene polarity chrons C4Ar–C5r (9.3–11.2 Ma), and for three excursion chrons within C5n.2n
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Astronomical ages for Miocene polarity chrons C4Ar–C5r (9.3–11.2 Ma), and for three excursion chrons within C5n.2n

机译：中新世极性年代为C4Ar–C5r（9.3-11.2 Ma）的天文年龄，以及C5n.2n以内的三个偏移时代的天文年龄。

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Ocean Drilling Program (ODP) Site 1092 from the sub-Antarctic South Atlantic produced a clear magnetic stratigraphy for the Late Miocene [Evans H.F., Channell, J.E.T., Upper Miocene Magnetic Stratigraphy from ODP Site 1092 (sub-Antarctic South Atlantic): recognition of cryptochrons in C5n, Geophys. Jour. Int., 153, (2003), 483–496]. Three short intervals of reverse polarity were identified within the long ( 1 Myr) normal polarity subchron C5n.2n. These excursion chrons were tentatively correlated to the three “cryptochrons” identified within subchron C5n.2n from NE Pacific marine magnetic anomaly data. New oxygen isotope data from ODP Site 1092 have allowed astronomical calibration of eight polarity chron boundaries in the interval between C4Ar.1n and C5r.1n (9.3–11.2 Ma) as well as calibration of the three excursion chrons identified within C5n.2n. The new polarity chron ages in the C4Ar.1n–C5r.1n interval differ from a current (2004) timescale by up to 48 kyr. The astrochronology yields durations in the 3–4 kyr range for the three excursion chrons in C5n.2n. The relative paleointensity record from Site 1092, and hence the three excursion chrons, can be correlated to the deep-tow magnetic anomaly record from 19°S on the East Pacific Rise (EPR). Based on published correlation of the EPR deep-tow record with the sea-surface magnetic anomaly stack from the NE Pacific, the three excursion chrons do not correspond to the “cryptochrons” recognized in the NE Pacific stack.
机译：南极次南大西洋的海洋钻探计划（ODP）地点1092为中新世晚期提供了清晰的磁性地层[Evans HF，Channell，JET，ODP地点1092（南极南大西洋）的上中新世磁性地层： C5n中的cryptochrons，Geophys。周杰伦Int。，153，（2003），483–496]。在长（1 Myr）正常极性子时钟C5n.2n中确定了三个短的相反极性间隔。这些偏移时间暂时与从NE太平洋海洋磁异常数据中的子时间C5n.2n中识别出的三个“密码时间”相关。来自ODP站点1092的新的氧同位素数据已允许对C4Ar.1n和C5r.1n之间的时间间隔（9.3-11.2 Ma）中的八个极性时间边界进行天文学校准，以及对C5n.2n中确定的三个偏移时间进行校准。 C4Ar.1n–C5r.1n间隔中的新极性年代与当前（2004年）时标最大相差48 kyr。对于C5n.2n中的三个偏移时间，天文年表的持续时间为3-4 kyr。来自站点1092的相对古强度记录，以及这三个偏移时间，可以与东太平洋上升带（EPR）上19°S的深部磁异常记录相关。根据已公布的EPR深层记录与NE太平洋海表磁异常堆栈的相关性，这三个偏移时间与NE Pacific堆栈中识别出的“加密时间”不对应。

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