Paleoenvironment evolution of the East Philippine Sea recorded in the new-type ferromanganese crust since the terminal Late Miocene

Paleoenvironment evolution of the East Philippine Sea recorded in the new-type ferromanganese crust since the terminal Late Miocene
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新型铁锰结壳记录的晚中新世末期以来的东菲律宾海古环境演化

DOI:
10.1007/s11430-007-0054-4
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发表时间:
2007-08
期刊:
Science in China Series D-Earth Sciences
影响因子:
--
通讯作者:
Meng QingYong
Meng QingYong
中科院分区:
其他
文献类型:
--
作者:
Li AnChun;Xu ZhaoKai;Jin Ning;Jiang FuQing;Li TieGang;Meng QingYong

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通过对东菲律宾海一新型深水铁锰结壳的显微构造、地球化学、铀系和10Be同位素测年的系统研究,恢复了目标区晚中新世末期以来的古环境演化。所研究的地壳显微结构和化学成分的垂直剖面变化一致,反映了地壳的三个主要增殖期和相应的古环境演化。底壳带形成于晚中新世晚期(5.6 Ma),微结构疏松,碎屑含量高,生长速度快。中上新世末期(2.8~2.7 Ma)矿物元素含量、吸积速率和Ce正异常程度的降低反映了时间上的增温,不利于地壳的吸积,最终形成了吸积空区。上新世晚期(2.7 Ma)南极底层海水较为活跃,促进了向顶部纯壳带的快速转换。此后,随着火山源的进一步远离和风成物质(1.0 Ma)的持续增加,尽管周围条件仍然有利,但矿物元素含量仍呈现明显的下降趋势。从而为晚中新世末期以来目标区不明的古海洋学研究提供了新的载体和资料。
From systemic research of microstructure, geochemistry, uranium-series and10Be isotope dating on a new-type deepwater ferromanganese crust from the East Philippine Sea, the paleoenvironment evolution of the target area since the terminal Late Miocene was recovered. The vertical section changes of microstructure and chemical composition are consistent in the studied crust, which indicate three major accretion periods and corresponding paleoenvironment evolution of the crust. The bottom crust zone was formed in the terminal Late Miocene (5.6 Ma) with loose microstructure, high detritus content and high growth rate. Reductions of mineral element content, accretion rate and positive Ce-anomaly degree at 4.6 Ma indicate temporal warming, which went against the crust accretion and finally formed an accretion gap in the terminal Middle Pliocene (2.8–2.7 Ma). The more active Antarctic bottom seawaters in the Late Pliocene (2.7 Ma) facilitated the fast transfer to the top pure crust zone. Hereafter, with the further apart of volcanic source and the keeping increase of eolian material (1.0 Ma), although surrounding conditions were still favorable, mineral element content still shows an obvious reducing trend. It thereby offers new carrier and data for the unclear paleoceanographic research of the target area since the terminal Late Miocene.
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