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Volume 43 Issue 1

Feb. 2021

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Article Navigation > Haiyang Xuebao > 2021 > 43(1): 102-109

Wang Yang，Fang Nianqiao. The relationship between the growth discontinuity of polymetallic crusts and phosphatization events[J]. Haiyang Xuebao，2021, 43(1)：102–109 doi: 10.12284/hyxb2021017

Citation:

Wang Yang，Fang Nianqiao. The relationship between the growth discontinuity of polymetallic crusts and phosphatization events[J]. Haiyang Xuebao，2021, 43(1)：102–109 doi: 10.12284/hyxb2021017

Wang Yang，Fang Nianqiao. The relationship between the growth discontinuity of polymetallic crusts and phosphatization events[J]. Haiyang Xuebao，2021, 43(1)：102–109 doi: 10.12284/hyxb2021017

Citation:

Wang Yang，Fang Nianqiao. The relationship between the growth discontinuity of polymetallic crusts and phosphatization events[J]. Haiyang Xuebao，2021, 43(1)：102–109 doi: 10.12284/hyxb2021017

The relationship between the growth discontinuity of polymetallic crusts and phosphatization events

doi: 10.12284/hyxb2021017

Wang Yang^1
,,
Fang Nianqiao^{1
,
,}

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

Received Date: 2019-11-01
Rev Recd Date: 2020-08-26

Available Online: 2021-01-20

Publish Date: 2021-01-25

Abstract

The occurrence of phosphatization will lead to the dilution of major ore-forming elements in polymetallic crusts and thus inhibit the growth of crusts in general. Phosphatization occurred in the Pacific Ocean in an episodic manner, and the occurrence periods correspond to the phosphatization layers in crusts and the geochemical characteristics of P, Ca and other elements, providing evidence for the dating of crusts. However, due to the frequent occurrence of phosphatization in multiple layers of crusts, a more reliable age frame needs to be determined before it can be mutually corroborated with phosphatization events. In this study, the Co-Os dating system with large dating range and the ability to determine hiatus was applicated in dating for the crust samples from central Pacific and western Pacific. With the naked eye identification of phosphatization mineralization features and geochemical profile characteristics, the age frames were proved and the effect of phosphatization on crust mineralization were discussed. The two large-scale phosphatization phases of 39–34 Ma and 27–21 Ma all correspond to the large-scale discontinuous phases of the crusts, while most small-scale phosphatization events in 71 Ma, 55 Ma and 31 Ma can be identified in the layers and geochemical profiles, corresponding to the rising and peak characteristics of P and Ca content. On the one hand, it is confirmed that the occurrence of phosphatization inhibits the growth of crusts, and has a wide range of influence area and a clear time interval in Pacific. On the other hand, it proves the accuracy of the chronological framework of polymetallic crusts.
- phosphatization,
- polymetallic crusts,
- paleoceanographyic events,
- age frame proving,
- growing hiatus

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