多金属结壳Os同位素组成区域性和阶段性偏高异常

王洋; 方念乔; 刘景昱

doi:10.3799/dqkx.2020.051

Volume 46 Issue 2

Feb. 2021

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Wang Yang, Fang Nianqiao, Liu Jingyu, 2021. Regional and Periodic Anomalies of Os Isotopic Composition in Polymetallic Crusts. Earth Science, 46(2): 719-728. doi: 10.3799/dqkx.2020.051

Citation:

Wang Yang, Fang Nianqiao, Liu Jingyu, 2021. Regional and Periodic Anomalies of Os Isotopic Composition in Polymetallic Crusts. Earth Science, 46(2): 719-728. doi: 10.3799/dqkx.2020.051

Wang Yang, Fang Nianqiao, Liu Jingyu, 2021. Regional and Periodic Anomalies of Os Isotopic Composition in Polymetallic Crusts. Earth Science, 46(2): 719-728. doi: 10.3799/dqkx.2020.051

Citation:

Wang Yang, Fang Nianqiao, Liu Jingyu, 2021. Regional and Periodic Anomalies of Os Isotopic Composition in Polymetallic Crusts. Earth Science, 46(2): 719-728. doi: 10.3799/dqkx.2020.051

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Regional and Periodic Anomalies of Os Isotopic Composition in Polymetallic Crusts

doi: 10.3799/dqkx.2020.051

School of Ocean Science, China University of Geosciences, Beijing 100083, China

Received Date: 2019-10-29
Publish Date: 2021-02-15

Abstract

Abstract

Os isotopic stratigraphic dating method can be used to obtain the age frame of polymetallic crusts including growth discontinuities with high resolution, which has better development prospects than traditional dating methods. In comparison with the stratified Os isotopic composition curve of polymetallic crusts and the standard curve of sea water, we dated for the crusts and at the same time, the regional characteristics of the standard curve and its relationship with the material derived from earth crust and mantle were studied. Based on morphological fit, the growing stages of polymetallic crusts were 80-75 Ma, 70-65 Ma, 60-50 Ma, 42-40 Ma, 35-28 Ma, 15-10 Ma and 8-0 Ma. In central-western Pacific, the measured curve of Os isotopic composition of crusts in Magellan and Marshall seamounts fits well with the shapes and values of the standard curve, while that of crusts in Marcus-Wake and Line seamounts fits well in the trend but the values are respectively higher since 7 Ma and before 33 Ma. This phenomenon is related to the process during which the crust travelled in and out of the influence copes of prevailing westerlies and equatorial trade winds. The crust received the wind-transported dust materials from the Americas and Asia when it was in the wind belt, which makes the Os isotopic composition recorded by the crust go higher than the standard curve.
- polymetallic crust,
- Line seamount,
- Marcus-Wake seamount,
- standard curve,
- osmium isotope,
- marine geology

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References(60)

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